UpdateItemRequest (AWS SDK for Android

java.lang.Object
- com.amazonaws.AmazonWebServiceRequest
- - com.amazonaws.services.dynamodbv2.model.UpdateItemRequest

All Implemented Interfaces:

java.io.Serializable, java.lang.Cloneable
```
public class UpdateItemRequest
extends AmazonWebServiceRequest
implements java.io.Serializable
```
Edits an existing item's attributes, or adds a new item to the table if it does not already exist. You can put, delete, or add attribute values. You can also perform a conditional update on an existing item (insert a new attribute name-value pair if it doesn't exist, or replace an existing name-value pair if it has certain expected attribute values).

You can also return the item's attribute values in the same UpdateItem operation using the ReturnValues parameter.

See Also:

Serialized Form

Constructor Summary

Constructors
Constructor and Description
`UpdateItemRequest()` Default constructor for UpdateItemRequest object.
`UpdateItemRequest(java.lang.String tableName, java.util.Map<java.lang.String,AttributeValue> key, java.util.Map<java.lang.String,AttributeValueUpdate> attributeUpdates)` Constructs a new UpdateItemRequest object.
`UpdateItemRequest(java.lang.String tableName, java.util.Map<java.lang.String,AttributeValue> key, java.util.Map<java.lang.String,AttributeValueUpdate> attributeUpdates, ReturnValue returnValues)` Constructs a new UpdateItemRequest object.
`UpdateItemRequest(java.lang.String tableName, java.util.Map<java.lang.String,AttributeValue> key, java.util.Map<java.lang.String,AttributeValueUpdate> attributeUpdates, java.lang.String returnValues)` Constructs a new UpdateItemRequest object.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`UpdateItemRequest`	`addAttributeUpdatesEntry(java.lang.String key, AttributeValueUpdate value)` This is a legacy parameter.
`UpdateItemRequest`	`addExpectedEntry(java.lang.String key, ExpectedAttributeValue value)` This is a legacy parameter.
`UpdateItemRequest`	`addExpressionAttributeNamesEntry(java.lang.String key, java.lang.String value)` One or more substitution tokens for attribute names in an expression.
`UpdateItemRequest`	`addExpressionAttributeValuesEntry(java.lang.String key, AttributeValue value)` One or more values that can be substituted in an expression.
`UpdateItemRequest`	`addKeyEntry(java.lang.String key, AttributeValue value)` The primary key of the item to be updated.
`UpdateItemRequest`	`clearAttributeUpdatesEntries()` Removes all the entries added into AttributeUpdates.
`UpdateItemRequest`	`clearExpectedEntries()` Removes all the entries added into Expected.
`UpdateItemRequest`	`clearExpressionAttributeNamesEntries()` Removes all the entries added into ExpressionAttributeNames.
`UpdateItemRequest`	`clearExpressionAttributeValuesEntries()` Removes all the entries added into ExpressionAttributeValues.
`UpdateItemRequest`	`clearKeyEntries()` Removes all the entries added into Key.
`boolean`	`equals(java.lang.Object obj)`
`java.util.Map<java.lang.String,AttributeValueUpdate>`	`getAttributeUpdates()` This is a legacy parameter.
`java.lang.String`	`getConditionalOperator()` This is a legacy parameter.
`java.lang.String`	`getConditionExpression()` A condition that must be satisfied in order for a conditional update to succeed.
`java.util.Map<java.lang.String,ExpectedAttributeValue>`	`getExpected()` This is a legacy parameter.
`java.util.Map<java.lang.String,java.lang.String>`	`getExpressionAttributeNames()` One or more substitution tokens for attribute names in an expression.
`java.util.Map<java.lang.String,AttributeValue>`	`getExpressionAttributeValues()` One or more values that can be substituted in an expression.
`java.util.Map<java.lang.String,AttributeValue>`	`getKey()` The primary key of the item to be updated.
`java.lang.String`	`getReturnConsumedCapacity()` Determines the level of detail about provisioned throughput consumption that is returned in the response:
`java.lang.String`	`getReturnItemCollectionMetrics()` Determines whether item collection metrics are returned.
`java.lang.String`	`getReturnValues()` Use `ReturnValues` if you want to get the item attributes as they appear before or after they are updated.
`java.lang.String`	`getTableName()` The name of the table containing the item to update.
`java.lang.String`	`getUpdateExpression()` An expression that defines one or more attributes to be updated, the action to be performed on them, and new value(s) for them.
`int`	`hashCode()`
`void`	`setAttributeUpdates(java.util.Map<java.lang.String,AttributeValueUpdate> attributeUpdates)` This is a legacy parameter.
`void`	`setConditionalOperator(ConditionalOperator conditionalOperator)` This is a legacy parameter.
`void`	`setConditionalOperator(java.lang.String conditionalOperator)` This is a legacy parameter.
`void`	`setConditionExpression(java.lang.String conditionExpression)` A condition that must be satisfied in order for a conditional update to succeed.
`void`	`setExpected(java.util.Map<java.lang.String,ExpectedAttributeValue> expected)` This is a legacy parameter.
`void`	`setExpressionAttributeNames(java.util.Map<java.lang.String,java.lang.String> expressionAttributeNames)` One or more substitution tokens for attribute names in an expression.
`void`	`setExpressionAttributeValues(java.util.Map<java.lang.String,AttributeValue> expressionAttributeValues)` One or more values that can be substituted in an expression.
`void`	`setKey(java.util.Map<java.lang.String,AttributeValue> key)` The primary key of the item to be updated.
`void`	`setReturnConsumedCapacity(ReturnConsumedCapacity returnConsumedCapacity)` Determines the level of detail about provisioned throughput consumption that is returned in the response:
`void`	`setReturnConsumedCapacity(java.lang.String returnConsumedCapacity)` Determines the level of detail about provisioned throughput consumption that is returned in the response:
`void`	`setReturnItemCollectionMetrics(ReturnItemCollectionMetrics returnItemCollectionMetrics)` Determines whether item collection metrics are returned.
`void`	`setReturnItemCollectionMetrics(java.lang.String returnItemCollectionMetrics)` Determines whether item collection metrics are returned.
`void`	`setReturnValues(ReturnValue returnValues)` Use `ReturnValues` if you want to get the item attributes as they appear before or after they are updated.
`void`	`setReturnValues(java.lang.String returnValues)` Use `ReturnValues` if you want to get the item attributes as they appear before or after they are updated.
`void`	`setTableName(java.lang.String tableName)` The name of the table containing the item to update.
`void`	`setUpdateExpression(java.lang.String updateExpression)` An expression that defines one or more attributes to be updated, the action to be performed on them, and new value(s) for them.
`java.lang.String`	`toString()` Returns a string representation of this object; useful for testing and debugging.
`UpdateItemRequest`	`withAttributeUpdates(java.util.Map<java.lang.String,AttributeValueUpdate> attributeUpdates)` This is a legacy parameter.
`UpdateItemRequest`	`withConditionalOperator(ConditionalOperator conditionalOperator)` This is a legacy parameter.
`UpdateItemRequest`	`withConditionalOperator(java.lang.String conditionalOperator)` This is a legacy parameter.
`UpdateItemRequest`	`withConditionExpression(java.lang.String conditionExpression)` A condition that must be satisfied in order for a conditional update to succeed.
`UpdateItemRequest`	`withExpected(java.util.Map<java.lang.String,ExpectedAttributeValue> expected)` This is a legacy parameter.
`UpdateItemRequest`	`withExpressionAttributeNames(java.util.Map<java.lang.String,java.lang.String> expressionAttributeNames)` One or more substitution tokens for attribute names in an expression.
`UpdateItemRequest`	`withExpressionAttributeValues(java.util.Map<java.lang.String,AttributeValue> expressionAttributeValues)` One or more values that can be substituted in an expression.
`UpdateItemRequest`	`withKey(java.util.Map<java.lang.String,AttributeValue> key)` The primary key of the item to be updated.
`UpdateItemRequest`	`withReturnConsumedCapacity(ReturnConsumedCapacity returnConsumedCapacity)` Determines the level of detail about provisioned throughput consumption that is returned in the response:
`UpdateItemRequest`	`withReturnConsumedCapacity(java.lang.String returnConsumedCapacity)` Determines the level of detail about provisioned throughput consumption that is returned in the response:
`UpdateItemRequest`	`withReturnItemCollectionMetrics(ReturnItemCollectionMetrics returnItemCollectionMetrics)` Determines whether item collection metrics are returned.
`UpdateItemRequest`	`withReturnItemCollectionMetrics(java.lang.String returnItemCollectionMetrics)` Determines whether item collection metrics are returned.
`UpdateItemRequest`	`withReturnValues(ReturnValue returnValues)` Use `ReturnValues` if you want to get the item attributes as they appear before or after they are updated.
`UpdateItemRequest`	`withReturnValues(java.lang.String returnValues)` Use `ReturnValues` if you want to get the item attributes as they appear before or after they are updated.
`UpdateItemRequest`	`withTableName(java.lang.String tableName)` The name of the table containing the item to update.
`UpdateItemRequest`	`withUpdateExpression(java.lang.String updateExpression)` An expression that defines one or more attributes to be updated, the action to be performed on them, and new value(s) for them.

Methods inherited from class com.amazonaws.AmazonWebServiceRequest
clone, getCloneRoot, getCloneSource, getGeneralProgressListener, getRequestClientOptions, getRequestCredentials, getRequestMetricCollector, setGeneralProgressListener, setRequestCredentials, setRequestMetricCollector, withGeneralProgressListener, withRequestMetricCollector

Methods inherited from class java.lang.Object
getClass, notify, notifyAll, wait, wait, wait

- Constructor Detail
  - UpdateItemRequest
```
public UpdateItemRequest()
```
    Default constructor for UpdateItemRequest object. Callers should use the setter or fluent setter (with...) methods to initialize any additional object members.
  - UpdateItemRequest
```
public UpdateItemRequest(java.lang.String tableName,
                         java.util.Map<java.lang.String,AttributeValue> key,
                         java.util.Map<java.lang.String,AttributeValueUpdate> attributeUpdates)
```
    Constructs a new UpdateItemRequest object. Callers should use the setter or fluent setter (with...) methods to initialize any additional object members.
    
    Parameters:
    
    tableName -
    The name of the table containing the item to update.
    
    key -
    The primary key of the item to be updated. Each element consists of an attribute name and a value for that attribute.
    
    For the primary key, you must provide all of the attributes. For example, with a simple primary key, you only need to provide a value for the partition key. For a composite primary key, you must provide values for both the partition key and the sort key.
    
    attributeUpdates -
    This is a legacy parameter. Use UpdateExpression instead. For more information, see AttributeUpdates in the Amazon DynamoDB Developer Guide.
  - UpdateItemRequest
```
public UpdateItemRequest(java.lang.String tableName,
                         java.util.Map<java.lang.String,AttributeValue> key,
                         java.util.Map<java.lang.String,AttributeValueUpdate> attributeUpdates,
                         java.lang.String returnValues)
```
    Constructs a new UpdateItemRequest object. Callers should use the setter or fluent setter (with...) methods to initialize any additional object members.
    Parameters:
    
    tableName -
    The name of the table containing the item to update.
    
    key -
    The primary key of the item to be updated. Each element consists of an attribute name and a value for that attribute.
    
    For the primary key, you must provide all of the attributes. For example, with a simple primary key, you only need to provide a value for the partition key. For a composite primary key, you must provide values for both the partition key and the sort key.
    
    attributeUpdates -
    This is a legacy parameter. Use UpdateExpression instead. For more information, see AttributeUpdates in the Amazon DynamoDB Developer Guide.
    returnValues -
    Use ReturnValues if you want to get the item attributes as they appear before or after they are updated. For UpdateItem, the valid values are:
    
    NONE - If ReturnValues is not specified, or if its value is NONE, then nothing is returned. (This setting is the default for ReturnValues.)
    
    ALL_OLD - Returns all of the attributes of the item, as they appeared before the UpdateItem operation.
    
    UPDATED_OLD - Returns only the updated attributes, as they appeared before the UpdateItem operation.
    
    ALL_NEW - Returns all of the attributes of the item, as they appear after the UpdateItem operation.
    
    UPDATED_NEW - Returns only the updated attributes, as they appear after the UpdateItem operation.
    
    There is no additional cost associated with requesting a return value aside from the small network and processing overhead of receiving a larger response. No read capacity units are consumed.
    
    The values returned are strongly consistent.
  - UpdateItemRequest
```
public UpdateItemRequest(java.lang.String tableName,
                         java.util.Map<java.lang.String,AttributeValue> key,
                         java.util.Map<java.lang.String,AttributeValueUpdate> attributeUpdates,
                         ReturnValue returnValues)
```
    Constructs a new UpdateItemRequest object. Callers should use the setter or fluent setter (with...) methods to initialize any additional object members.
    Parameters:
    
    tableName -
    The name of the table containing the item to update.
    
    key -
    The primary key of the item to be updated. Each element consists of an attribute name and a value for that attribute.
    
    For the primary key, you must provide all of the attributes. For example, with a simple primary key, you only need to provide a value for the partition key. For a composite primary key, you must provide values for both the partition key and the sort key.
    
    attributeUpdates -
    This is a legacy parameter. Use UpdateExpression instead. For more information, see AttributeUpdates in the Amazon DynamoDB Developer Guide.
    returnValues -
    Use ReturnValues if you want to get the item attributes as they appear before or after they are updated. For UpdateItem, the valid values are:
    
    NONE - If ReturnValues is not specified, or if its value is NONE, then nothing is returned. (This setting is the default for ReturnValues.)
    
    ALL_OLD - Returns all of the attributes of the item, as they appeared before the UpdateItem operation.
    
    UPDATED_OLD - Returns only the updated attributes, as they appeared before the UpdateItem operation.
    
    ALL_NEW - Returns all of the attributes of the item, as they appear after the UpdateItem operation.
    
    UPDATED_NEW - Returns only the updated attributes, as they appear after the UpdateItem operation.
    
    There is no additional cost associated with requesting a return value aside from the small network and processing overhead of receiving a larger response. No read capacity units are consumed.
    
    The values returned are strongly consistent.
- Method Detail
  - getTableName
```
public java.lang.String getTableName()
```
    The name of the table containing the item to update.
    
    Constraints:
    Length: 3 - 255
    Pattern: [a-zA-Z0-9_.-]+
    
    Returns:
    
    The name of the table containing the item to update.
  - setTableName
```
public void setTableName(java.lang.String tableName)
```
    The name of the table containing the item to update.
    
    Constraints:
    Length: 3 - 255
    Pattern: [a-zA-Z0-9_.-]+
    
    Parameters:
    
    tableName -
    The name of the table containing the item to update.
  - withTableName
```
public UpdateItemRequest withTableName(java.lang.String tableName)
```
    The name of the table containing the item to update.
    
    Returns a reference to this object so that method calls can be chained together.
    Constraints:
    Length: 3 - 255
    Pattern: [a-zA-Z0-9_.-]+
    
    Parameters:
    
    tableName -
    The name of the table containing the item to update.
    
    Returns:
    
    A reference to this updated object so that method calls can be chained together.
  - getKey
```
public java.util.Map<java.lang.String,AttributeValue> getKey()
```
    The primary key of the item to be updated. Each element consists of an attribute name and a value for that attribute.
    
    For the primary key, you must provide all of the attributes. For example, with a simple primary key, you only need to provide a value for the partition key. For a composite primary key, you must provide values for both the partition key and the sort key.
    
    Returns:
    
    The primary key of the item to be updated. Each element consists of an attribute name and a value for that attribute.
    
    For the primary key, you must provide all of the attributes. For example, with a simple primary key, you only need to provide a value for the partition key. For a composite primary key, you must provide values for both the partition key and the sort key.
  - setKey
```
public void setKey(java.util.Map<java.lang.String,AttributeValue> key)
```
    The primary key of the item to be updated. Each element consists of an attribute name and a value for that attribute.
    
    For the primary key, you must provide all of the attributes. For example, with a simple primary key, you only need to provide a value for the partition key. For a composite primary key, you must provide values for both the partition key and the sort key.
    
    Parameters:
    
    key -
    The primary key of the item to be updated. Each element consists of an attribute name and a value for that attribute.
    
    For the primary key, you must provide all of the attributes. For example, with a simple primary key, you only need to provide a value for the partition key. For a composite primary key, you must provide values for both the partition key and the sort key.
  - withKey
```
public UpdateItemRequest withKey(java.util.Map<java.lang.String,AttributeValue> key)
```
    The primary key of the item to be updated. Each element consists of an attribute name and a value for that attribute.
    
    For the primary key, you must provide all of the attributes. For example, with a simple primary key, you only need to provide a value for the partition key. For a composite primary key, you must provide values for both the partition key and the sort key.
    
    Returns a reference to this object so that method calls can be chained together.
    
    Parameters:
    
    key -
    The primary key of the item to be updated. Each element consists of an attribute name and a value for that attribute.
    
    For the primary key, you must provide all of the attributes. For example, with a simple primary key, you only need to provide a value for the partition key. For a composite primary key, you must provide values for both the partition key and the sort key.
    
    Returns:
    
    A reference to this updated object so that method calls can be chained together.
  - addKeyEntry
```
public UpdateItemRequest addKeyEntry(java.lang.String key,
                                     AttributeValue value)
```
    The primary key of the item to be updated. Each element consists of an attribute name and a value for that attribute.
    
    For the primary key, you must provide all of the attributes. For example, with a simple primary key, you only need to provide a value for the partition key. For a composite primary key, you must provide values for both the partition key and the sort key.
    
    The method adds a new key-value pair into Key parameter, and returns a reference to this object so that method calls can be chained together.
    
    Parameters:
    
    key - The key of the entry to be added into Key.
    
    value - The corresponding value of the entry to be added into Key.
    
    Returns:
    
    A reference to this updated object so that method calls can be chained together.
  - clearKeyEntries
```
public UpdateItemRequest clearKeyEntries()
```
    Removes all the entries added into Key.
    Returns a reference to this object so that method calls can be chained together.
  - getAttributeUpdates
```
public java.util.Map<java.lang.String,AttributeValueUpdate> getAttributeUpdates()
```
    This is a legacy parameter. Use UpdateExpression instead. For more information, see AttributeUpdates in the Amazon DynamoDB Developer Guide.
    
    Returns:
    
    This is a legacy parameter. Use UpdateExpression instead. For more information, see AttributeUpdates in the Amazon DynamoDB Developer Guide.
  - setAttributeUpdates
```
public void setAttributeUpdates(java.util.Map<java.lang.String,AttributeValueUpdate> attributeUpdates)
```
    This is a legacy parameter. Use UpdateExpression instead. For more information, see AttributeUpdates in the Amazon DynamoDB Developer Guide.
    
    Parameters:
    
    attributeUpdates -
    This is a legacy parameter. Use UpdateExpression instead. For more information, see AttributeUpdates in the Amazon DynamoDB Developer Guide.
  - withAttributeUpdates
```
public UpdateItemRequest withAttributeUpdates(java.util.Map<java.lang.String,AttributeValueUpdate> attributeUpdates)
```
    This is a legacy parameter. Use UpdateExpression instead. For more information, see AttributeUpdates in the Amazon DynamoDB Developer Guide.
    
    Returns a reference to this object so that method calls can be chained together.
    
    Parameters:
    
    attributeUpdates -
    This is a legacy parameter. Use UpdateExpression instead. For more information, see AttributeUpdates in the Amazon DynamoDB Developer Guide.
    
    Returns:
    
    A reference to this updated object so that method calls can be chained together.
  - addAttributeUpdatesEntry
```
public UpdateItemRequest addAttributeUpdatesEntry(java.lang.String key,
                                                  AttributeValueUpdate value)
```
    This is a legacy parameter. Use UpdateExpression instead. For more information, see AttributeUpdates in the Amazon DynamoDB Developer Guide.
    
    The method adds a new key-value pair into AttributeUpdates parameter, and returns a reference to this object so that method calls can be chained together.
    
    Parameters:
    
    key - The key of the entry to be added into AttributeUpdates.
    
    value - The corresponding value of the entry to be added into AttributeUpdates.
    
    Returns:
    
    A reference to this updated object so that method calls can be chained together.
  - clearAttributeUpdatesEntries
```
public UpdateItemRequest clearAttributeUpdatesEntries()
```
    Removes all the entries added into AttributeUpdates.
    Returns a reference to this object so that method calls can be chained together.
  - getExpected
```
public java.util.Map<java.lang.String,ExpectedAttributeValue> getExpected()
```
    This is a legacy parameter. Use ConditionExpression instead. For more information, see Expected in the Amazon DynamoDB Developer Guide.
    
    Returns:
    
    This is a legacy parameter. Use ConditionExpression instead. For more information, see Expected in the Amazon DynamoDB Developer Guide.
  - setExpected
```
public void setExpected(java.util.Map<java.lang.String,ExpectedAttributeValue> expected)
```
    This is a legacy parameter. Use ConditionExpression instead. For more information, see Expected in the Amazon DynamoDB Developer Guide.
    
    Parameters:
    
    expected -
    This is a legacy parameter. Use ConditionExpression instead. For more information, see Expected in the Amazon DynamoDB Developer Guide.
  - withExpected
```
public UpdateItemRequest withExpected(java.util.Map<java.lang.String,ExpectedAttributeValue> expected)
```
    This is a legacy parameter. Use ConditionExpression instead. For more information, see Expected in the Amazon DynamoDB Developer Guide.
    
    Returns a reference to this object so that method calls can be chained together.
    
    Parameters:
    
    expected -
    This is a legacy parameter. Use ConditionExpression instead. For more information, see Expected in the Amazon DynamoDB Developer Guide.
    
    Returns:
    
    A reference to this updated object so that method calls can be chained together.
  - addExpectedEntry
```
public UpdateItemRequest addExpectedEntry(java.lang.String key,
                                          ExpectedAttributeValue value)
```
    This is a legacy parameter. Use ConditionExpression instead. For more information, see Expected in the Amazon DynamoDB Developer Guide.
    
    The method adds a new key-value pair into Expected parameter, and returns a reference to this object so that method calls can be chained together.
    
    Parameters:
    
    key - The key of the entry to be added into Expected.
    
    value - The corresponding value of the entry to be added into Expected.
    
    Returns:
    
    A reference to this updated object so that method calls can be chained together.
  - clearExpectedEntries
```
public UpdateItemRequest clearExpectedEntries()
```
    Removes all the entries added into Expected.
    Returns a reference to this object so that method calls can be chained together.
  - getConditionalOperator
```
public java.lang.String getConditionalOperator()
```
    This is a legacy parameter. Use ConditionExpression instead. For more information, see ConditionalOperator in the Amazon DynamoDB Developer Guide.
    
    Constraints:
    Allowed Values: AND, OR
    
    Returns:
    
    This is a legacy parameter. Use ConditionExpression instead. For more information, see ConditionalOperator in the Amazon DynamoDB Developer Guide.
    
    See Also:
    
    ConditionalOperator
  - setConditionalOperator
```
public void setConditionalOperator(java.lang.String conditionalOperator)
```
    This is a legacy parameter. Use ConditionExpression instead. For more information, see ConditionalOperator in the Amazon DynamoDB Developer Guide.
    
    Constraints:
    Allowed Values: AND, OR
    
    Parameters:
    
    conditionalOperator -
    This is a legacy parameter. Use ConditionExpression instead. For more information, see ConditionalOperator in the Amazon DynamoDB Developer Guide.
    
    See Also:
    
    ConditionalOperator
  - withConditionalOperator
```
public UpdateItemRequest withConditionalOperator(java.lang.String conditionalOperator)
```
    This is a legacy parameter. Use ConditionExpression instead. For more information, see ConditionalOperator in the Amazon DynamoDB Developer Guide.
    
    Returns a reference to this object so that method calls can be chained together.
    Constraints:
    Allowed Values: AND, OR
    
    Parameters:
    
    conditionalOperator -
    This is a legacy parameter. Use ConditionExpression instead. For more information, see ConditionalOperator in the Amazon DynamoDB Developer Guide.
    
    Returns:
    
    A reference to this updated object so that method calls can be chained together.
    
    See Also:
    
    ConditionalOperator
  - setConditionalOperator
```
public void setConditionalOperator(ConditionalOperator conditionalOperator)
```
    This is a legacy parameter. Use ConditionExpression instead. For more information, see ConditionalOperator in the Amazon DynamoDB Developer Guide.
    
    Constraints:
    Allowed Values: AND, OR
    
    Parameters:
    
    conditionalOperator -
    This is a legacy parameter. Use ConditionExpression instead. For more information, see ConditionalOperator in the Amazon DynamoDB Developer Guide.
    
    See Also:
    
    ConditionalOperator
  - withConditionalOperator
```
public UpdateItemRequest withConditionalOperator(ConditionalOperator conditionalOperator)
```
    This is a legacy parameter. Use ConditionExpression instead. For more information, see ConditionalOperator in the Amazon DynamoDB Developer Guide.
    
    Returns a reference to this object so that method calls can be chained together.
    Constraints:
    Allowed Values: AND, OR
    
    Parameters:
    
    conditionalOperator -
    This is a legacy parameter. Use ConditionExpression instead. For more information, see ConditionalOperator in the Amazon DynamoDB Developer Guide.
    
    Returns:
    
    A reference to this updated object so that method calls can be chained together.
    
    See Also:
    
    ConditionalOperator
  - getReturnValues
```
public java.lang.String getReturnValues()
```
    Use ReturnValues if you want to get the item attributes as they appear before or after they are updated. For UpdateItem , the valid values are:
    - NONE - If ReturnValues is not specified, or if its value is NONE, then nothing is returned. (This setting is the default for ReturnValues.)
    - ALL_OLD - Returns all of the attributes of the item, as they appeared before the UpdateItem operation.
    - UPDATED_OLD - Returns only the updated attributes, as they appeared before the UpdateItem operation.
    - ALL_NEW - Returns all of the attributes of the item, as they appear after the UpdateItem operation.
    - UPDATED_NEW - Returns only the updated attributes, as they appear after the UpdateItem operation.
    There is no additional cost associated with requesting a return value aside from the small network and processing overhead of receiving a larger response. No read capacity units are consumed.
    
    The values returned are strongly consistent.
    
    Constraints:
    Allowed Values: NONE, ALL_OLD, UPDATED_OLD, ALL_NEW, UPDATED_NEW
    Returns:
    Use ReturnValues if you want to get the item attributes as they appear before or after they are updated. For UpdateItem, the valid values are:
    
    NONE - If ReturnValues is not specified, or if its value is NONE, then nothing is returned. (This setting is the default for ReturnValues.)
    
    ALL_OLD - Returns all of the attributes of the item, as they appeared before the UpdateItem operation.
    
    UPDATED_OLD - Returns only the updated attributes, as they appeared before the UpdateItem operation.
    
    ALL_NEW - Returns all of the attributes of the item, as they appear after the UpdateItem operation.
    
    UPDATED_NEW - Returns only the updated attributes, as they appear after the UpdateItem operation.
    
    There is no additional cost associated with requesting a return value aside from the small network and processing overhead of receiving a larger response. No read capacity units are consumed.
    
    The values returned are strongly consistent.
    See Also:
    
    ReturnValue
  - setReturnValues
```
public void setReturnValues(java.lang.String returnValues)
```
    Use ReturnValues if you want to get the item attributes as they appear before or after they are updated. For UpdateItem , the valid values are:
    - NONE - If ReturnValues is not specified, or if its value is NONE, then nothing is returned. (This setting is the default for ReturnValues.)
    - ALL_OLD - Returns all of the attributes of the item, as they appeared before the UpdateItem operation.
    - UPDATED_OLD - Returns only the updated attributes, as they appeared before the UpdateItem operation.
    - ALL_NEW - Returns all of the attributes of the item, as they appear after the UpdateItem operation.
    - UPDATED_NEW - Returns only the updated attributes, as they appear after the UpdateItem operation.
    There is no additional cost associated with requesting a return value aside from the small network and processing overhead of receiving a larger response. No read capacity units are consumed.
    
    The values returned are strongly consistent.
    
    Constraints:
    Allowed Values: NONE, ALL_OLD, UPDATED_OLD, ALL_NEW, UPDATED_NEW
    Parameters:
    returnValues -
    Use ReturnValues if you want to get the item attributes as they appear before or after they are updated. For UpdateItem, the valid values are:
    
    NONE - If ReturnValues is not specified, or if its value is NONE, then nothing is returned. (This setting is the default for ReturnValues.)
    
    ALL_OLD - Returns all of the attributes of the item, as they appeared before the UpdateItem operation.
    
    UPDATED_OLD - Returns only the updated attributes, as they appeared before the UpdateItem operation.
    
    ALL_NEW - Returns all of the attributes of the item, as they appear after the UpdateItem operation.
    
    UPDATED_NEW - Returns only the updated attributes, as they appear after the UpdateItem operation.
    
    There is no additional cost associated with requesting a return value aside from the small network and processing overhead of receiving a larger response. No read capacity units are consumed.
    
    The values returned are strongly consistent.
    See Also:
    
    ReturnValue
  - withReturnValues
```
public UpdateItemRequest withReturnValues(java.lang.String returnValues)
```
    Use ReturnValues if you want to get the item attributes as they appear before or after they are updated. For UpdateItem , the valid values are:
    - NONE - If ReturnValues is not specified, or if its value is NONE, then nothing is returned. (This setting is the default for ReturnValues.)
    - ALL_OLD - Returns all of the attributes of the item, as they appeared before the UpdateItem operation.
    - UPDATED_OLD - Returns only the updated attributes, as they appeared before the UpdateItem operation.
    - ALL_NEW - Returns all of the attributes of the item, as they appear after the UpdateItem operation.
    - UPDATED_NEW - Returns only the updated attributes, as they appear after the UpdateItem operation.
    There is no additional cost associated with requesting a return value aside from the small network and processing overhead of receiving a larger response. No read capacity units are consumed.
    
    The values returned are strongly consistent.
    
    Returns a reference to this object so that method calls can be chained together.
    Constraints:
    Allowed Values: NONE, ALL_OLD, UPDATED_OLD, ALL_NEW, UPDATED_NEW
    Parameters:
    returnValues -
    Use ReturnValues if you want to get the item attributes as they appear before or after they are updated. For UpdateItem, the valid values are:
    
    NONE - If ReturnValues is not specified, or if its value is NONE, then nothing is returned. (This setting is the default for ReturnValues.)
    
    ALL_OLD - Returns all of the attributes of the item, as they appeared before the UpdateItem operation.
    
    UPDATED_OLD - Returns only the updated attributes, as they appeared before the UpdateItem operation.
    
    ALL_NEW - Returns all of the attributes of the item, as they appear after the UpdateItem operation.
    
    UPDATED_NEW - Returns only the updated attributes, as they appear after the UpdateItem operation.
    
    There is no additional cost associated with requesting a return value aside from the small network and processing overhead of receiving a larger response. No read capacity units are consumed.
    
    The values returned are strongly consistent.
    Returns:
    
    A reference to this updated object so that method calls can be chained together.
    
    See Also:
    
    ReturnValue
  - setReturnValues
```
public void setReturnValues(ReturnValue returnValues)
```
    Use ReturnValues if you want to get the item attributes as they appear before or after they are updated. For UpdateItem , the valid values are:
    - NONE - If ReturnValues is not specified, or if its value is NONE, then nothing is returned. (This setting is the default for ReturnValues.)
    - ALL_OLD - Returns all of the attributes of the item, as they appeared before the UpdateItem operation.
    - UPDATED_OLD - Returns only the updated attributes, as they appeared before the UpdateItem operation.
    - ALL_NEW - Returns all of the attributes of the item, as they appear after the UpdateItem operation.
    - UPDATED_NEW - Returns only the updated attributes, as they appear after the UpdateItem operation.
    There is no additional cost associated with requesting a return value aside from the small network and processing overhead of receiving a larger response. No read capacity units are consumed.
    
    The values returned are strongly consistent.
    
    Constraints:
    Allowed Values: NONE, ALL_OLD, UPDATED_OLD, ALL_NEW, UPDATED_NEW
    Parameters:
    returnValues -
    Use ReturnValues if you want to get the item attributes as they appear before or after they are updated. For UpdateItem, the valid values are:
    
    NONE - If ReturnValues is not specified, or if its value is NONE, then nothing is returned. (This setting is the default for ReturnValues.)
    
    ALL_OLD - Returns all of the attributes of the item, as they appeared before the UpdateItem operation.
    
    UPDATED_OLD - Returns only the updated attributes, as they appeared before the UpdateItem operation.
    
    ALL_NEW - Returns all of the attributes of the item, as they appear after the UpdateItem operation.
    
    UPDATED_NEW - Returns only the updated attributes, as they appear after the UpdateItem operation.
    
    There is no additional cost associated with requesting a return value aside from the small network and processing overhead of receiving a larger response. No read capacity units are consumed.
    
    The values returned are strongly consistent.
    See Also:
    
    ReturnValue
  - withReturnValues
```
public UpdateItemRequest withReturnValues(ReturnValue returnValues)
```
    Use ReturnValues if you want to get the item attributes as they appear before or after they are updated. For UpdateItem , the valid values are:
    - NONE - If ReturnValues is not specified, or if its value is NONE, then nothing is returned. (This setting is the default for ReturnValues.)
    - ALL_OLD - Returns all of the attributes of the item, as they appeared before the UpdateItem operation.
    - UPDATED_OLD - Returns only the updated attributes, as they appeared before the UpdateItem operation.
    - ALL_NEW - Returns all of the attributes of the item, as they appear after the UpdateItem operation.
    - UPDATED_NEW - Returns only the updated attributes, as they appear after the UpdateItem operation.
    There is no additional cost associated with requesting a return value aside from the small network and processing overhead of receiving a larger response. No read capacity units are consumed.
    
    The values returned are strongly consistent.
    
    Returns a reference to this object so that method calls can be chained together.
    Constraints:
    Allowed Values: NONE, ALL_OLD, UPDATED_OLD, ALL_NEW, UPDATED_NEW
    Parameters:
    returnValues -
    Use ReturnValues if you want to get the item attributes as they appear before or after they are updated. For UpdateItem, the valid values are:
    
    NONE - If ReturnValues is not specified, or if its value is NONE, then nothing is returned. (This setting is the default for ReturnValues.)
    
    ALL_OLD - Returns all of the attributes of the item, as they appeared before the UpdateItem operation.
    
    UPDATED_OLD - Returns only the updated attributes, as they appeared before the UpdateItem operation.
    
    ALL_NEW - Returns all of the attributes of the item, as they appear after the UpdateItem operation.
    
    UPDATED_NEW - Returns only the updated attributes, as they appear after the UpdateItem operation.
    
    There is no additional cost associated with requesting a return value aside from the small network and processing overhead of receiving a larger response. No read capacity units are consumed.
    
    The values returned are strongly consistent.
    Returns:
    
    A reference to this updated object so that method calls can be chained together.
    
    See Also:
    
    ReturnValue
  - getReturnConsumedCapacity
```
public java.lang.String getReturnConsumedCapacity()
```
    Determines the level of detail about provisioned throughput consumption that is returned in the response:
    - INDEXES - The response includes the aggregate ConsumedCapacity for the operation, together with ConsumedCapacity for each table and secondary index that was accessed.
      
      Note that some operations, such as GetItem and BatchGetItem, do not access any indexes at all. In these cases, specifying INDEXES will only return ConsumedCapacity information for table(s).
    - TOTAL - The response includes only the aggregate ConsumedCapacity for the operation.
    - NONE - No ConsumedCapacity details are included in the response.
    Constraints:
    Allowed Values: INDEXES, TOTAL, NONE
    Returns:
    Determines the level of detail about provisioned throughput consumption that is returned in the response:
    
    INDEXES - The response includes the aggregate ConsumedCapacity for the operation, together with ConsumedCapacity for each table and secondary index that was accessed.
    
    Note that some operations, such as GetItem and BatchGetItem, do not access any indexes at all. In these cases, specifying INDEXES will only return ConsumedCapacity information for table(s).
    
    TOTAL - The response includes only the aggregate ConsumedCapacity for the operation.
    
    NONE - No ConsumedCapacity details are included in the response.
    See Also:
    
    ReturnConsumedCapacity
  - setReturnConsumedCapacity
```
public void setReturnConsumedCapacity(java.lang.String returnConsumedCapacity)
```
    Determines the level of detail about provisioned throughput consumption that is returned in the response:
    - INDEXES - The response includes the aggregate ConsumedCapacity for the operation, together with ConsumedCapacity for each table and secondary index that was accessed.
      
      Note that some operations, such as GetItem and BatchGetItem, do not access any indexes at all. In these cases, specifying INDEXES will only return ConsumedCapacity information for table(s).
    - TOTAL - The response includes only the aggregate ConsumedCapacity for the operation.
    - NONE - No ConsumedCapacity details are included in the response.
    Constraints:
    Allowed Values: INDEXES, TOTAL, NONE
    Parameters:
    returnConsumedCapacity -
    Determines the level of detail about provisioned throughput consumption that is returned in the response:
    
    INDEXES - The response includes the aggregate ConsumedCapacity for the operation, together with ConsumedCapacity for each table and secondary index that was accessed.
    
    Note that some operations, such as GetItem and BatchGetItem, do not access any indexes at all. In these cases, specifying INDEXES will only return ConsumedCapacity information for table(s).
    
    TOTAL - The response includes only the aggregate ConsumedCapacity for the operation.
    
    NONE - No ConsumedCapacity details are included in the response.
    See Also:
    
    ReturnConsumedCapacity
  - withReturnConsumedCapacity
```
public UpdateItemRequest withReturnConsumedCapacity(java.lang.String returnConsumedCapacity)
```
    Determines the level of detail about provisioned throughput consumption that is returned in the response:
    - INDEXES - The response includes the aggregate ConsumedCapacity for the operation, together with ConsumedCapacity for each table and secondary index that was accessed.
      
      Note that some operations, such as GetItem and BatchGetItem, do not access any indexes at all. In these cases, specifying INDEXES will only return ConsumedCapacity information for table(s).
    - TOTAL - The response includes only the aggregate ConsumedCapacity for the operation.
    - NONE - No ConsumedCapacity details are included in the response.
    Returns a reference to this object so that method calls can be chained together.
    Constraints:
    Allowed Values: INDEXES, TOTAL, NONE
    Parameters:
    returnConsumedCapacity -
    Determines the level of detail about provisioned throughput consumption that is returned in the response:
    
    INDEXES - The response includes the aggregate ConsumedCapacity for the operation, together with ConsumedCapacity for each table and secondary index that was accessed.
    
    Note that some operations, such as GetItem and BatchGetItem, do not access any indexes at all. In these cases, specifying INDEXES will only return ConsumedCapacity information for table(s).
    
    TOTAL - The response includes only the aggregate ConsumedCapacity for the operation.
    
    NONE - No ConsumedCapacity details are included in the response.
    Returns:
    
    A reference to this updated object so that method calls can be chained together.
    
    See Also:
    
    ReturnConsumedCapacity
  - setReturnConsumedCapacity
```
public void setReturnConsumedCapacity(ReturnConsumedCapacity returnConsumedCapacity)
```
    Determines the level of detail about provisioned throughput consumption that is returned in the response:
    - INDEXES - The response includes the aggregate ConsumedCapacity for the operation, together with ConsumedCapacity for each table and secondary index that was accessed.
      
      Note that some operations, such as GetItem and BatchGetItem, do not access any indexes at all. In these cases, specifying INDEXES will only return ConsumedCapacity information for table(s).
    - TOTAL - The response includes only the aggregate ConsumedCapacity for the operation.
    - NONE - No ConsumedCapacity details are included in the response.
    Constraints:
    Allowed Values: INDEXES, TOTAL, NONE
    Parameters:
    returnConsumedCapacity -
    Determines the level of detail about provisioned throughput consumption that is returned in the response:
    
    INDEXES - The response includes the aggregate ConsumedCapacity for the operation, together with ConsumedCapacity for each table and secondary index that was accessed.
    
    Note that some operations, such as GetItem and BatchGetItem, do not access any indexes at all. In these cases, specifying INDEXES will only return ConsumedCapacity information for table(s).
    
    TOTAL - The response includes only the aggregate ConsumedCapacity for the operation.
    
    NONE - No ConsumedCapacity details are included in the response.
    See Also:
    
    ReturnConsumedCapacity
  - withReturnConsumedCapacity
```
public UpdateItemRequest withReturnConsumedCapacity(ReturnConsumedCapacity returnConsumedCapacity)
```
    Determines the level of detail about provisioned throughput consumption that is returned in the response:
    - INDEXES - The response includes the aggregate ConsumedCapacity for the operation, together with ConsumedCapacity for each table and secondary index that was accessed.
      
      Note that some operations, such as GetItem and BatchGetItem, do not access any indexes at all. In these cases, specifying INDEXES will only return ConsumedCapacity information for table(s).
    - TOTAL - The response includes only the aggregate ConsumedCapacity for the operation.
    - NONE - No ConsumedCapacity details are included in the response.
    Returns a reference to this object so that method calls can be chained together.
    Constraints:
    Allowed Values: INDEXES, TOTAL, NONE
    Parameters:
    returnConsumedCapacity -
    Determines the level of detail about provisioned throughput consumption that is returned in the response:
    
    INDEXES - The response includes the aggregate ConsumedCapacity for the operation, together with ConsumedCapacity for each table and secondary index that was accessed.
    
    Note that some operations, such as GetItem and BatchGetItem, do not access any indexes at all. In these cases, specifying INDEXES will only return ConsumedCapacity information for table(s).
    
    TOTAL - The response includes only the aggregate ConsumedCapacity for the operation.
    
    NONE - No ConsumedCapacity details are included in the response.
    Returns:
    
    A reference to this updated object so that method calls can be chained together.
    
    See Also:
    
    ReturnConsumedCapacity
  - getReturnItemCollectionMetrics
```
public java.lang.String getReturnItemCollectionMetrics()
```
    Determines whether item collection metrics are returned. If set to SIZE, the response includes statistics about item collections, if any, that were modified during the operation are returned in the response. If set to NONE (the default), no statistics are returned.
    
    Constraints:
    Allowed Values: SIZE, NONE
    
    Returns:
    
    Determines whether item collection metrics are returned. If set to SIZE, the response includes statistics about item collections, if any, that were modified during the operation are returned in the response. If set to NONE (the default), no statistics are returned.
    
    See Also:
    
    ReturnItemCollectionMetrics
  - setReturnItemCollectionMetrics
```
public void setReturnItemCollectionMetrics(java.lang.String returnItemCollectionMetrics)
```
    Determines whether item collection metrics are returned. If set to SIZE, the response includes statistics about item collections, if any, that were modified during the operation are returned in the response. If set to NONE (the default), no statistics are returned.
    
    Constraints:
    Allowed Values: SIZE, NONE
    
    Parameters:
    
    returnItemCollectionMetrics -
    Determines whether item collection metrics are returned. If set to SIZE, the response includes statistics about item collections, if any, that were modified during the operation are returned in the response. If set to NONE (the default), no statistics are returned.
    
    See Also:
    
    ReturnItemCollectionMetrics
  - withReturnItemCollectionMetrics
```
public UpdateItemRequest withReturnItemCollectionMetrics(java.lang.String returnItemCollectionMetrics)
```
    Determines whether item collection metrics are returned. If set to SIZE, the response includes statistics about item collections, if any, that were modified during the operation are returned in the response. If set to NONE (the default), no statistics are returned.
    
    Returns a reference to this object so that method calls can be chained together.
    Constraints:
    Allowed Values: SIZE, NONE
    
    Parameters:
    
    returnItemCollectionMetrics -
    Determines whether item collection metrics are returned. If set to SIZE, the response includes statistics about item collections, if any, that were modified during the operation are returned in the response. If set to NONE (the default), no statistics are returned.
    
    Returns:
    
    A reference to this updated object so that method calls can be chained together.
    
    See Also:
    
    ReturnItemCollectionMetrics
  - setReturnItemCollectionMetrics
```
public void setReturnItemCollectionMetrics(ReturnItemCollectionMetrics returnItemCollectionMetrics)
```
    Determines whether item collection metrics are returned. If set to SIZE, the response includes statistics about item collections, if any, that were modified during the operation are returned in the response. If set to NONE (the default), no statistics are returned.
    
    Constraints:
    Allowed Values: SIZE, NONE
    
    Parameters:
    
    returnItemCollectionMetrics -
    Determines whether item collection metrics are returned. If set to SIZE, the response includes statistics about item collections, if any, that were modified during the operation are returned in the response. If set to NONE (the default), no statistics are returned.
    
    See Also:
    
    ReturnItemCollectionMetrics
  - withReturnItemCollectionMetrics
```
public UpdateItemRequest withReturnItemCollectionMetrics(ReturnItemCollectionMetrics returnItemCollectionMetrics)
```
    Determines whether item collection metrics are returned. If set to SIZE, the response includes statistics about item collections, if any, that were modified during the operation are returned in the response. If set to NONE (the default), no statistics are returned.
    
    Returns a reference to this object so that method calls can be chained together.
    Constraints:
    Allowed Values: SIZE, NONE
    
    Parameters:
    
    returnItemCollectionMetrics -
    Determines whether item collection metrics are returned. If set to SIZE, the response includes statistics about item collections, if any, that were modified during the operation are returned in the response. If set to NONE (the default), no statistics are returned.
    
    Returns:
    
    A reference to this updated object so that method calls can be chained together.
    
    See Also:
    
    ReturnItemCollectionMetrics
  - getUpdateExpression
```
public java.lang.String getUpdateExpression()
```
    An expression that defines one or more attributes to be updated, the action to be performed on them, and new value(s) for them.
    
    The following action values are available for UpdateExpression.
    - SET - Adds one or more attributes and values to an item. If any of these attribute already exist, they are replaced by the new values. You can also use SET to add or subtract from an attribute that is of type Number. For example: SET myNum = myNum + :val
      
      SET supports the following functions:
      
      if_not_exists (path, operand) - if the item does not contain an attribute at the specified path, then if_not_exists evaluates to operand; otherwise, it evaluates to path. You can use this function to avoid overwriting an attribute that may already be present in the item.
      
      list_append (operand, operand) - evaluates to a list with a new element added to it. You can append the new element to the start or the end of the list by reversing the order of the operands.
      
      These function names are case-sensitive.
    - REMOVE - Removes one or more attributes from an item.
    - ADD - Adds the specified value to the item, if the attribute does not already exist. If the attribute does exist, then the behavior of ADD depends on the data type of the attribute:
      
      If the existing attribute is a number, and if Value is also a number, then Value is mathematically added to the existing attribute. If Value is a negative number, then it is subtracted from the existing attribute.
      
      If you use ADD to increment or decrement a number value for an item that doesn't exist before the update, DynamoDB uses 0 as the initial value.
      
      Similarly, if you use ADD for an existing item to increment or decrement an attribute value that doesn't exist before the update, DynamoDB uses 0 as the initial value. For example, suppose that the item you want to update doesn't have an attribute named itemcount, but you decide to ADD the number 3 to this attribute anyway. DynamoDB will create the itemcount attribute, set its initial value to 0, and finally add 3 to it. The result will be a new itemcount attribute in the item, with a value of 3.
      
      If the existing data type is a set and if Value is also a set, then Value is added to the existing set. For example, if the attribute value is the set [1,2], and the ADD action specified [3], then the final attribute value is [1,2,3]. An error occurs if an ADD action is specified for a set attribute and the attribute type specified does not match the existing set type.
      
      Both sets must have the same primitive data type. For example, if the existing data type is a set of strings, the Value must also be a set of strings.
      
      The ADD action only supports Number and set data types. In addition, ADD can only be used on top-level attributes, not nested attributes.
    - DELETE - Deletes an element from a set.
      
      If a set of values is specified, then those values are subtracted from the old set. For example, if the attribute value was the set [a,b,c] and the DELETE action specifies [a,c], then the final attribute value is [b]. Specifying an empty set is an error.
      
      The DELETE action only supports set data types. In addition, DELETE can only be used on top-level attributes, not nested attributes.
    You can have many actions in a single expression, such as the following: SET a=:value1, b=:value2 DELETE :value3, :value4, :value5
    
    For more information on update expressions, see Modifying Items and Attributes in the Amazon DynamoDB Developer Guide.
    Returns:
    An expression that defines one or more attributes to be updated, the action to be performed on them, and new value(s) for them.
    
    The following action values are available for UpdateExpression.
    
    SET - Adds one or more attributes and values to an item. If any of these attribute already exist, they are replaced by the new values. You can also use SET to add or subtract from an attribute that is of type Number. For example: SET myNum = myNum + :val
    
    SET supports the following functions:
    
    if_not_exists (path, operand) - if the item does not contain an attribute at the specified path, then if_not_exists evaluates to operand; otherwise, it evaluates to path. You can use this function to avoid overwriting an attribute that may already be present in the item.
    
    list_append (operand, operand) - evaluates to a list with a new element added to it. You can append the new element to the start or the end of the list by reversing the order of the operands.
    
    These function names are case-sensitive.
    
    REMOVE - Removes one or more attributes from an item.
    
    ADD - Adds the specified value to the item, if the attribute does not already exist. If the attribute does exist, then the behavior of ADD depends on the data type of the attribute:
    
    If the existing attribute is a number, and if Value is also a number, then Value is mathematically added to the existing attribute. If Value is a negative number, then it is subtracted from the existing attribute.
    
    If you use ADD to increment or decrement a number value for an item that doesn't exist before the update, DynamoDB uses 0 as the initial value.
    
    Similarly, if you use ADD for an existing item to increment or decrement an attribute value that doesn't exist before the update, DynamoDB uses 0 as the initial value. For example, suppose that the item you want to update doesn't have an attribute named itemcount, but you decide to ADD the number 3 to this attribute anyway. DynamoDB will create the itemcount attribute, set its initial value to 0, and finally add 3 to it. The result will be a new itemcount attribute in the item, with a value of 3.
    
    If the existing data type is a set and if Value is also a set, then Value is added to the existing set. For example, if the attribute value is the set [1,2] , and the ADD action specified [3], then the final attribute value is [1,2,3]. An error occurs if an ADD action is specified for a set attribute and the attribute type specified does not match the existing set type.
    
    Both sets must have the same primitive data type. For example, if the existing data type is a set of strings, the Value must also be a set of strings.
    
    The ADD action only supports Number and set data types. In addition, ADD can only be used on top-level attributes, not nested attributes.
    
    DELETE - Deletes an element from a set.
    
    If a set of values is specified, then those values are subtracted from the old set. For example, if the attribute value was the set [a,b,c] and the DELETE action specifies [a,c], then the final attribute value is [b]. Specifying an empty set is an error.
    
    The DELETE action only supports set data types. In addition, DELETE can only be used on top-level attributes, not nested attributes.
    
    You can have many actions in a single expression, such as the following: SET a=:value1, b=:value2 DELETE :value3, :value4, :value5
    
    For more information on update expressions, see Modifying Items and Attributes in the Amazon DynamoDB Developer Guide.
  - setUpdateExpression
```
public void setUpdateExpression(java.lang.String updateExpression)
```
    An expression that defines one or more attributes to be updated, the action to be performed on them, and new value(s) for them.
    
    The following action values are available for UpdateExpression.
    - SET - Adds one or more attributes and values to an item. If any of these attribute already exist, they are replaced by the new values. You can also use SET to add or subtract from an attribute that is of type Number. For example: SET myNum = myNum + :val
      
      SET supports the following functions:
      
      if_not_exists (path, operand) - if the item does not contain an attribute at the specified path, then if_not_exists evaluates to operand; otherwise, it evaluates to path. You can use this function to avoid overwriting an attribute that may already be present in the item.
      
      list_append (operand, operand) - evaluates to a list with a new element added to it. You can append the new element to the start or the end of the list by reversing the order of the operands.
      
      These function names are case-sensitive.
    - REMOVE - Removes one or more attributes from an item.
    - ADD - Adds the specified value to the item, if the attribute does not already exist. If the attribute does exist, then the behavior of ADD depends on the data type of the attribute:
      
      If the existing attribute is a number, and if Value is also a number, then Value is mathematically added to the existing attribute. If Value is a negative number, then it is subtracted from the existing attribute.
      
      If you use ADD to increment or decrement a number value for an item that doesn't exist before the update, DynamoDB uses 0 as the initial value.
      
      Similarly, if you use ADD for an existing item to increment or decrement an attribute value that doesn't exist before the update, DynamoDB uses 0 as the initial value. For example, suppose that the item you want to update doesn't have an attribute named itemcount, but you decide to ADD the number 3 to this attribute anyway. DynamoDB will create the itemcount attribute, set its initial value to 0, and finally add 3 to it. The result will be a new itemcount attribute in the item, with a value of 3.
      
      If the existing data type is a set and if Value is also a set, then Value is added to the existing set. For example, if the attribute value is the set [1,2], and the ADD action specified [3], then the final attribute value is [1,2,3]. An error occurs if an ADD action is specified for a set attribute and the attribute type specified does not match the existing set type.
      
      Both sets must have the same primitive data type. For example, if the existing data type is a set of strings, the Value must also be a set of strings.
      
      The ADD action only supports Number and set data types. In addition, ADD can only be used on top-level attributes, not nested attributes.
    - DELETE - Deletes an element from a set.
      
      If a set of values is specified, then those values are subtracted from the old set. For example, if the attribute value was the set [a,b,c] and the DELETE action specifies [a,c], then the final attribute value is [b]. Specifying an empty set is an error.
      
      The DELETE action only supports set data types. In addition, DELETE can only be used on top-level attributes, not nested attributes.
    You can have many actions in a single expression, such as the following: SET a=:value1, b=:value2 DELETE :value3, :value4, :value5
    
    For more information on update expressions, see Modifying Items and Attributes in the Amazon DynamoDB Developer Guide.
    Parameters:
    updateExpression -
    An expression that defines one or more attributes to be updated, the action to be performed on them, and new value(s) for them.
    
    The following action values are available for UpdateExpression.
    
    SET - Adds one or more attributes and values to an item. If any of these attribute already exist, they are replaced by the new values. You can also use SET to add or subtract from an attribute that is of type Number. For example: SET myNum = myNum + :val
    
    SET supports the following functions:
    
    if_not_exists (path, operand) - if the item does not contain an attribute at the specified path, then if_not_exists evaluates to operand; otherwise, it evaluates to path. You can use this function to avoid overwriting an attribute that may already be present in the item.
    
    list_append (operand, operand) - evaluates to a list with a new element added to it. You can append the new element to the start or the end of the list by reversing the order of the operands.
    
    These function names are case-sensitive.
    
    REMOVE - Removes one or more attributes from an item.
    
    ADD - Adds the specified value to the item, if the attribute does not already exist. If the attribute does exist, then the behavior of ADD depends on the data type of the attribute:
    
    If the existing attribute is a number, and if Value is also a number, then Value is mathematically added to the existing attribute. If Value is a negative number, then it is subtracted from the existing attribute.
    
    If you use ADD to increment or decrement a number value for an item that doesn't exist before the update, DynamoDB uses 0 as the initial value.
    
    Similarly, if you use ADD for an existing item to increment or decrement an attribute value that doesn't exist before the update, DynamoDB uses 0 as the initial value. For example, suppose that the item you want to update doesn't have an attribute named itemcount, but you decide to ADD the number 3 to this attribute anyway. DynamoDB will create the itemcount attribute, set its initial value to 0, and finally add 3 to it. The result will be a new itemcount attribute in the item, with a value of 3.
    
    If the existing data type is a set and if Value is also a set, then Value is added to the existing set. For example, if the attribute value is the set [1,2], and the ADD action specified [3], then the final attribute value is [1,2,3]. An error occurs if an ADD action is specified for a set attribute and the attribute type specified does not match the existing set type.
    
    Both sets must have the same primitive data type. For example, if the existing data type is a set of strings, the Value must also be a set of strings.
    
    The ADD action only supports Number and set data types. In addition, ADD can only be used on top-level attributes, not nested attributes.
    
    DELETE - Deletes an element from a set.
    
    If a set of values is specified, then those values are subtracted from the old set. For example, if the attribute value was the set [a,b,c] and the DELETE action specifies [a,c], then the final attribute value is [b]. Specifying an empty set is an error.
    
    The DELETE action only supports set data types. In addition, DELETE can only be used on top-level attributes, not nested attributes.
    
    You can have many actions in a single expression, such as the following: SET a=:value1, b=:value2 DELETE :value3, :value4, :value5
    
    For more information on update expressions, see Modifying Items and Attributes in the Amazon DynamoDB Developer Guide.
  - withUpdateExpression
```
public UpdateItemRequest withUpdateExpression(java.lang.String updateExpression)
```
    An expression that defines one or more attributes to be updated, the action to be performed on them, and new value(s) for them.
    
    The following action values are available for UpdateExpression.
    - SET - Adds one or more attributes and values to an item. If any of these attribute already exist, they are replaced by the new values. You can also use SET to add or subtract from an attribute that is of type Number. For example: SET myNum = myNum + :val
      
      SET supports the following functions:
      
      if_not_exists (path, operand) - if the item does not contain an attribute at the specified path, then if_not_exists evaluates to operand; otherwise, it evaluates to path. You can use this function to avoid overwriting an attribute that may already be present in the item.
      
      list_append (operand, operand) - evaluates to a list with a new element added to it. You can append the new element to the start or the end of the list by reversing the order of the operands.
      
      These function names are case-sensitive.
    - REMOVE - Removes one or more attributes from an item.
    - ADD - Adds the specified value to the item, if the attribute does not already exist. If the attribute does exist, then the behavior of ADD depends on the data type of the attribute:
      
      If the existing attribute is a number, and if Value is also a number, then Value is mathematically added to the existing attribute. If Value is a negative number, then it is subtracted from the existing attribute.
      
      If you use ADD to increment or decrement a number value for an item that doesn't exist before the update, DynamoDB uses 0 as the initial value.
      
      Similarly, if you use ADD for an existing item to increment or decrement an attribute value that doesn't exist before the update, DynamoDB uses 0 as the initial value. For example, suppose that the item you want to update doesn't have an attribute named itemcount, but you decide to ADD the number 3 to this attribute anyway. DynamoDB will create the itemcount attribute, set its initial value to 0, and finally add 3 to it. The result will be a new itemcount attribute in the item, with a value of 3.
      
      If the existing data type is a set and if Value is also a set, then Value is added to the existing set. For example, if the attribute value is the set [1,2], and the ADD action specified [3], then the final attribute value is [1,2,3]. An error occurs if an ADD action is specified for a set attribute and the attribute type specified does not match the existing set type.
      
      Both sets must have the same primitive data type. For example, if the existing data type is a set of strings, the Value must also be a set of strings.
      
      The ADD action only supports Number and set data types. In addition, ADD can only be used on top-level attributes, not nested attributes.
    - DELETE - Deletes an element from a set.
      
      If a set of values is specified, then those values are subtracted from the old set. For example, if the attribute value was the set [a,b,c] and the DELETE action specifies [a,c], then the final attribute value is [b]. Specifying an empty set is an error.
      
      The DELETE action only supports set data types. In addition, DELETE can only be used on top-level attributes, not nested attributes.
    You can have many actions in a single expression, such as the following: SET a=:value1, b=:value2 DELETE :value3, :value4, :value5
    
    For more information on update expressions, see Modifying Items and Attributes in the Amazon DynamoDB Developer Guide.
    
    Returns a reference to this object so that method calls can be chained together.
    Parameters:
    updateExpression -
    An expression that defines one or more attributes to be updated, the action to be performed on them, and new value(s) for them.
    
    The following action values are available for UpdateExpression.
    
    SET - Adds one or more attributes and values to an item. If any of these attribute already exist, they are replaced by the new values. You can also use SET to add or subtract from an attribute that is of type Number. For example: SET myNum = myNum + :val
    
    SET supports the following functions:
    
    if_not_exists (path, operand) - if the item does not contain an attribute at the specified path, then if_not_exists evaluates to operand; otherwise, it evaluates to path. You can use this function to avoid overwriting an attribute that may already be present in the item.
    
    list_append (operand, operand) - evaluates to a list with a new element added to it. You can append the new element to the start or the end of the list by reversing the order of the operands.
    
    These function names are case-sensitive.
    
    REMOVE - Removes one or more attributes from an item.
    
    ADD - Adds the specified value to the item, if the attribute does not already exist. If the attribute does exist, then the behavior of ADD depends on the data type of the attribute:
    
    If the existing attribute is a number, and if Value is also a number, then Value is mathematically added to the existing attribute. If Value is a negative number, then it is subtracted from the existing attribute.
    
    If you use ADD to increment or decrement a number value for an item that doesn't exist before the update, DynamoDB uses 0 as the initial value.
    
    Similarly, if you use ADD for an existing item to increment or decrement an attribute value that doesn't exist before the update, DynamoDB uses 0 as the initial value. For example, suppose that the item you want to update doesn't have an attribute named itemcount, but you decide to ADD the number 3 to this attribute anyway. DynamoDB will create the itemcount attribute, set its initial value to 0, and finally add 3 to it. The result will be a new itemcount attribute in the item, with a value of 3.
    
    If the existing data type is a set and if Value is also a set, then Value is added to the existing set. For example, if the attribute value is the set [1,2], and the ADD action specified [3], then the final attribute value is [1,2,3]. An error occurs if an ADD action is specified for a set attribute and the attribute type specified does not match the existing set type.
    
    Both sets must have the same primitive data type. For example, if the existing data type is a set of strings, the Value must also be a set of strings.
    
    The ADD action only supports Number and set data types. In addition, ADD can only be used on top-level attributes, not nested attributes.
    
    DELETE - Deletes an element from a set.
    
    If a set of values is specified, then those values are subtracted from the old set. For example, if the attribute value was the set [a,b,c] and the DELETE action specifies [a,c], then the final attribute value is [b]. Specifying an empty set is an error.
    
    The DELETE action only supports set data types. In addition, DELETE can only be used on top-level attributes, not nested attributes.
    
    You can have many actions in a single expression, such as the following: SET a=:value1, b=:value2 DELETE :value3, :value4, :value5
    
    For more information on update expressions, see Modifying Items and Attributes in the Amazon DynamoDB Developer Guide.
    Returns:
    
    A reference to this updated object so that method calls can be chained together.
  - getConditionExpression
```
public java.lang.String getConditionExpression()
```
    A condition that must be satisfied in order for a conditional update to succeed.
    
    An expression can contain any of the following:
    - Functions: attribute_exists | attribute_not_exists | attribute_type | contains | begins_with | size
      
      These function names are case-sensitive.
    - Comparison operators: = | <> | < | > | <= | >= | BETWEEN | IN
    - Logical operators: AND | OR | NOT
    For more information on condition expressions, see Specifying Conditions in the Amazon DynamoDB Developer Guide.
    Returns:
    A condition that must be satisfied in order for a conditional update to succeed.
    
    An expression can contain any of the following:
    
    Functions: attribute_exists | attribute_not_exists | attribute_type | contains | begins_with | size
    
    These function names are case-sensitive.
    
    Comparison operators: = | <> | < | > | <= | >= | BETWEEN | IN
    
    Logical operators: AND | OR | NOT
    
    For more information on condition expressions, see Specifying Conditions in the Amazon DynamoDB Developer Guide.
  - setConditionExpression
```
public void setConditionExpression(java.lang.String conditionExpression)
```
    A condition that must be satisfied in order for a conditional update to succeed.
    
    An expression can contain any of the following:
    - Functions: attribute_exists | attribute_not_exists | attribute_type | contains | begins_with | size
      
      These function names are case-sensitive.
    - Comparison operators: = | <> | < | > | <= | >= | BETWEEN | IN
    - Logical operators: AND | OR | NOT
    For more information on condition expressions, see Specifying Conditions in the Amazon DynamoDB Developer Guide.
    Parameters:
    conditionExpression -
    A condition that must be satisfied in order for a conditional update to succeed.
    
    An expression can contain any of the following:
    
    Functions: attribute_exists | attribute_not_exists | attribute_type | contains | begins_with | size
    
    These function names are case-sensitive.
    
    Comparison operators: = | <> | < | > | <= | >= | BETWEEN | IN
    
    Logical operators: AND | OR | NOT
    
    For more information on condition expressions, see Specifying Conditions in the Amazon DynamoDB Developer Guide.
  - withConditionExpression
```
public UpdateItemRequest withConditionExpression(java.lang.String conditionExpression)
```
    A condition that must be satisfied in order for a conditional update to succeed.
    
    An expression can contain any of the following:
    - Functions: attribute_exists | attribute_not_exists | attribute_type | contains | begins_with | size
      
      These function names are case-sensitive.
    - Comparison operators: = | <> | < | > | <= | >= | BETWEEN | IN
    - Logical operators: AND | OR | NOT
    For more information on condition expressions, see Specifying Conditions in the Amazon DynamoDB Developer Guide.
    
    Returns a reference to this object so that method calls can be chained together.
    Parameters:
    conditionExpression -
    A condition that must be satisfied in order for a conditional update to succeed.
    
    An expression can contain any of the following:
    
    Functions: attribute_exists | attribute_not_exists | attribute_type | contains | begins_with | size
    
    These function names are case-sensitive.
    
    Comparison operators: = | <> | < | > | <= | >= | BETWEEN | IN
    
    Logical operators: AND | OR | NOT
    
    For more information on condition expressions, see Specifying Conditions in the Amazon DynamoDB Developer Guide.
    Returns:
    
    A reference to this updated object so that method calls can be chained together.
  - getExpressionAttributeNames
```
public java.util.Map<java.lang.String,java.lang.String> getExpressionAttributeNames()
```
    One or more substitution tokens for attribute names in an expression. The following are some use cases for using ExpressionAttributeNames:
    - To access an attribute whose name conflicts with a DynamoDB reserved word.
    - To create a placeholder for repeating occurrences of an attribute name in an expression.
    - To prevent special characters in an attribute name from being misinterpreted in an expression.
    Use the # character in an expression to dereference an attribute name. For example, consider the following attribute name:
    - Percentile
    The name of this attribute conflicts with a reserved word, so it cannot be used directly in an expression. (For the complete list of reserved words, see Reserved Words in the Amazon DynamoDB Developer Guide). To work around this, you could specify the following for ExpressionAttributeNames:
    - {"#P":"Percentile"}
    You could then use this substitution in an expression, as in this example:
    - #P = :val
    Tokens that begin with the : character are expression attribute values, which are placeholders for the actual value at runtime.
    
    For more information on expression attribute names, see Accessing Item Attributes in the Amazon DynamoDB Developer Guide.
    Returns:
    One or more substitution tokens for attribute names in an expression. The following are some use cases for using ExpressionAttributeNames:
    
    To access an attribute whose name conflicts with a DynamoDB reserved word.
    
    To create a placeholder for repeating occurrences of an attribute name in an expression.
    
    To prevent special characters in an attribute name from being misinterpreted in an expression.
    
    Use the # character in an expression to dereference an attribute name. For example, consider the following attribute name:
    
    Percentile
    
    The name of this attribute conflicts with a reserved word, so it cannot be used directly in an expression. (For the complete list of reserved words, see Reserved Words in the Amazon DynamoDB Developer Guide). To work around this, you could specify the following for ExpressionAttributeNames:
    
    {"#P":"Percentile"}
    
    You could then use this substitution in an expression, as in this example:
    
    #P = :val
    
    Tokens that begin with the : character are expression attribute values, which are placeholders for the actual value at runtime.
    
    For more information on expression attribute names, see Accessing Item Attributes in the Amazon DynamoDB Developer Guide.
  - setExpressionAttributeNames
```
public void setExpressionAttributeNames(java.util.Map<java.lang.String,java.lang.String> expressionAttributeNames)
```
    One or more substitution tokens for attribute names in an expression. The following are some use cases for using ExpressionAttributeNames:
    - To access an attribute whose name conflicts with a DynamoDB reserved word.
    - To create a placeholder for repeating occurrences of an attribute name in an expression.
    - To prevent special characters in an attribute name from being misinterpreted in an expression.
    Use the # character in an expression to dereference an attribute name. For example, consider the following attribute name:
    - Percentile
    The name of this attribute conflicts with a reserved word, so it cannot be used directly in an expression. (For the complete list of reserved words, see Reserved Words in the Amazon DynamoDB Developer Guide). To work around this, you could specify the following for ExpressionAttributeNames:
    - {"#P":"Percentile"}
    You could then use this substitution in an expression, as in this example:
    - #P = :val
    Tokens that begin with the : character are expression attribute values, which are placeholders for the actual value at runtime.
    
    For more information on expression attribute names, see Accessing Item Attributes in the Amazon DynamoDB Developer Guide.
    Parameters:
    expressionAttributeNames -
    One or more substitution tokens for attribute names in an expression. The following are some use cases for using ExpressionAttributeNames:
    
    To access an attribute whose name conflicts with a DynamoDB reserved word.
    
    To create a placeholder for repeating occurrences of an attribute name in an expression.
    
    To prevent special characters in an attribute name from being misinterpreted in an expression.
    
    Use the # character in an expression to dereference an attribute name. For example, consider the following attribute name:
    
    Percentile
    
    The name of this attribute conflicts with a reserved word, so it cannot be used directly in an expression. (For the complete list of reserved words, see Reserved Words in the Amazon DynamoDB Developer Guide). To work around this, you could specify the following for ExpressionAttributeNames:
    
    {"#P":"Percentile"}
    
    You could then use this substitution in an expression, as in this example:
    
    #P = :val
    
    Tokens that begin with the : character are expression attribute values, which are placeholders for the actual value at runtime.
    
    For more information on expression attribute names, see Accessing Item Attributes in the Amazon DynamoDB Developer Guide.
  - withExpressionAttributeNames
```
public UpdateItemRequest withExpressionAttributeNames(java.util.Map<java.lang.String,java.lang.String> expressionAttributeNames)
```
    One or more substitution tokens for attribute names in an expression. The following are some use cases for using ExpressionAttributeNames:
    - To access an attribute whose name conflicts with a DynamoDB reserved word.
    - To create a placeholder for repeating occurrences of an attribute name in an expression.
    - To prevent special characters in an attribute name from being misinterpreted in an expression.
    Use the # character in an expression to dereference an attribute name. For example, consider the following attribute name:
    - Percentile
    The name of this attribute conflicts with a reserved word, so it cannot be used directly in an expression. (For the complete list of reserved words, see Reserved Words in the Amazon DynamoDB Developer Guide). To work around this, you could specify the following for ExpressionAttributeNames:
    - {"#P":"Percentile"}
    You could then use this substitution in an expression, as in this example:
    - #P = :val
    Tokens that begin with the : character are expression attribute values, which are placeholders for the actual value at runtime.
    
    For more information on expression attribute names, see Accessing Item Attributes in the Amazon DynamoDB Developer Guide.
    
    Returns a reference to this object so that method calls can be chained together.
    Parameters:
    expressionAttributeNames -
    One or more substitution tokens for attribute names in an expression. The following are some use cases for using ExpressionAttributeNames:
    
    To access an attribute whose name conflicts with a DynamoDB reserved word.
    
    To create a placeholder for repeating occurrences of an attribute name in an expression.
    
    To prevent special characters in an attribute name from being misinterpreted in an expression.
    
    Use the # character in an expression to dereference an attribute name. For example, consider the following attribute name:
    
    Percentile
    
    The name of this attribute conflicts with a reserved word, so it cannot be used directly in an expression. (For the complete list of reserved words, see Reserved Words in the Amazon DynamoDB Developer Guide). To work around this, you could specify the following for ExpressionAttributeNames:
    
    {"#P":"Percentile"}
    
    You could then use this substitution in an expression, as in this example:
    
    #P = :val
    
    Tokens that begin with the : character are expression attribute values, which are placeholders for the actual value at runtime.
    
    For more information on expression attribute names, see Accessing Item Attributes in the Amazon DynamoDB Developer Guide.
    Returns:
    
    A reference to this updated object so that method calls can be chained together.
  - addExpressionAttributeNamesEntry
```
public UpdateItemRequest addExpressionAttributeNamesEntry(java.lang.String key,
                                                          java.lang.String value)
```
    One or more substitution tokens for attribute names in an expression. The following are some use cases for using ExpressionAttributeNames:
    - To access an attribute whose name conflicts with a DynamoDB reserved word.
    - To create a placeholder for repeating occurrences of an attribute name in an expression.
    - To prevent special characters in an attribute name from being misinterpreted in an expression.
    Use the # character in an expression to dereference an attribute name. For example, consider the following attribute name:
    - Percentile
    The name of this attribute conflicts with a reserved word, so it cannot be used directly in an expression. (For the complete list of reserved words, see Reserved Words in the Amazon DynamoDB Developer Guide). To work around this, you could specify the following for ExpressionAttributeNames:
    - {"#P":"Percentile"}
    You could then use this substitution in an expression, as in this example:
    - #P = :val
    Tokens that begin with the : character are expression attribute values, which are placeholders for the actual value at runtime.
    
    For more information on expression attribute names, see Accessing Item Attributes in the Amazon DynamoDB Developer Guide.
    
    The method adds a new key-value pair into ExpressionAttributeNames parameter, and returns a reference to this object so that method calls can be chained together.
    Parameters:
    
    key - The key of the entry to be added into ExpressionAttributeNames.
    
    value - The corresponding value of the entry to be added into ExpressionAttributeNames.
    
    Returns:
    
    A reference to this updated object so that method calls can be chained together.
  - clearExpressionAttributeNamesEntries
```
public UpdateItemRequest clearExpressionAttributeNamesEntries()
```
    Removes all the entries added into ExpressionAttributeNames.
    Returns a reference to this object so that method calls can be chained together.
  - getExpressionAttributeValues
```
public java.util.Map<java.lang.String,AttributeValue> getExpressionAttributeValues()
```
    One or more values that can be substituted in an expression.
    
    Use the : (colon) character in an expression to dereference an attribute value. For example, suppose that you wanted to check whether the value of the ProductStatus attribute was one of the following:
    
    Available | Backordered | Discontinued
    
    You would first need to specify ExpressionAttributeValues as follows:
    
    { ":avail":{"S":"Available"}, ":back":{"S":"Backordered"}, ":disc":{"S":"Discontinued"} }
    
    You could then use these values in an expression, such as this:
    
    ProductStatus IN (:avail, :back, :disc)
    
    For more information on expression attribute values, see Specifying Conditions in the Amazon DynamoDB Developer Guide.
    
    Returns:
    
    One or more values that can be substituted in an expression.
    
    Use the : (colon) character in an expression to dereference an attribute value. For example, suppose that you wanted to check whether the value of the ProductStatus attribute was one of the following:
    
    Available | Backordered | Discontinued
    
    You would first need to specify ExpressionAttributeValues as follows:
    
    { ":avail":{"S":"Available"}, ":back":{"S":"Backordered"}, ":disc":{"S":"Discontinued"} }
    
    You could then use these values in an expression, such as this:
    
    ProductStatus IN (:avail, :back, :disc)
    
    For more information on expression attribute values, see Specifying Conditions in the Amazon DynamoDB Developer Guide.
  - setExpressionAttributeValues
```
public void setExpressionAttributeValues(java.util.Map<java.lang.String,AttributeValue> expressionAttributeValues)
```
    One or more values that can be substituted in an expression.
    
    Use the : (colon) character in an expression to dereference an attribute value. For example, suppose that you wanted to check whether the value of the ProductStatus attribute was one of the following:
    
    Available | Backordered | Discontinued
    
    You would first need to specify ExpressionAttributeValues as follows:
    
    { ":avail":{"S":"Available"}, ":back":{"S":"Backordered"}, ":disc":{"S":"Discontinued"} }
    
    You could then use these values in an expression, such as this:
    
    ProductStatus IN (:avail, :back, :disc)
    
    For more information on expression attribute values, see Specifying Conditions in the Amazon DynamoDB Developer Guide.
    
    Parameters:
    
    expressionAttributeValues -
    One or more values that can be substituted in an expression.
    
    Use the : (colon) character in an expression to dereference an attribute value. For example, suppose that you wanted to check whether the value of the ProductStatus attribute was one of the following:
    
    Available | Backordered | Discontinued
    
    You would first need to specify ExpressionAttributeValues as follows:
    
    { ":avail":{"S":"Available"}, ":back":{"S":"Backordered"}, ":disc":{"S":"Discontinued"} }
    
    You could then use these values in an expression, such as this:
    
    ProductStatus IN (:avail, :back, :disc)
    
    For more information on expression attribute values, see Specifying Conditions in the Amazon DynamoDB Developer Guide.
  - withExpressionAttributeValues
```
public UpdateItemRequest withExpressionAttributeValues(java.util.Map<java.lang.String,AttributeValue> expressionAttributeValues)
```
    One or more values that can be substituted in an expression.
    
    Use the : (colon) character in an expression to dereference an attribute value. For example, suppose that you wanted to check whether the value of the ProductStatus attribute was one of the following:
    
    Available | Backordered | Discontinued
    
    You would first need to specify ExpressionAttributeValues as follows:
    
    { ":avail":{"S":"Available"}, ":back":{"S":"Backordered"}, ":disc":{"S":"Discontinued"} }
    
    You could then use these values in an expression, such as this:
    
    ProductStatus IN (:avail, :back, :disc)
    
    For more information on expression attribute values, see Specifying Conditions in the Amazon DynamoDB Developer Guide.
    
    Returns a reference to this object so that method calls can be chained together.
    
    Parameters:
    
    expressionAttributeValues -
    One or more values that can be substituted in an expression.
    
    Use the : (colon) character in an expression to dereference an attribute value. For example, suppose that you wanted to check whether the value of the ProductStatus attribute was one of the following:
    
    Available | Backordered | Discontinued
    
    You would first need to specify ExpressionAttributeValues as follows:
    
    { ":avail":{"S":"Available"}, ":back":{"S":"Backordered"}, ":disc":{"S":"Discontinued"} }
    
    You could then use these values in an expression, such as this:
    
    ProductStatus IN (:avail, :back, :disc)
    
    For more information on expression attribute values, see Specifying Conditions in the Amazon DynamoDB Developer Guide.
    
    Returns:
    
    A reference to this updated object so that method calls can be chained together.
  - addExpressionAttributeValuesEntry
```
public UpdateItemRequest addExpressionAttributeValuesEntry(java.lang.String key,
                                                           AttributeValue value)
```
    One or more values that can be substituted in an expression.
    
    Use the : (colon) character in an expression to dereference an attribute value. For example, suppose that you wanted to check whether the value of the ProductStatus attribute was one of the following:
    
    Available | Backordered | Discontinued
    
    You would first need to specify ExpressionAttributeValues as follows:
    
    { ":avail":{"S":"Available"}, ":back":{"S":"Backordered"}, ":disc":{"S":"Discontinued"} }
    
    You could then use these values in an expression, such as this:
    
    ProductStatus IN (:avail, :back, :disc)
    
    For more information on expression attribute values, see Specifying Conditions in the Amazon DynamoDB Developer Guide.
    
    The method adds a new key-value pair into ExpressionAttributeValues parameter, and returns a reference to this object so that method calls can be chained together.
    
    Parameters:
    
    key - The key of the entry to be added into ExpressionAttributeValues.
    
    value - The corresponding value of the entry to be added into ExpressionAttributeValues.
    
    Returns:
    
    A reference to this updated object so that method calls can be chained together.
  - clearExpressionAttributeValuesEntries
```
public UpdateItemRequest clearExpressionAttributeValuesEntries()
```
    Removes all the entries added into ExpressionAttributeValues.
    Returns a reference to this object so that method calls can be chained together.
  - toString
```
public java.lang.String toString()
```
    Returns a string representation of this object; useful for testing and debugging.
    
    Overrides:
    
    toString in class java.lang.Object
    
    Returns:
    
    A string representation of this object.
    
    See Also:
    
    Object.toString()
  - hashCode
```
public int hashCode()
```
    Overrides:
    
    hashCode in class java.lang.Object
  - equals
```
public boolean equals(java.lang.Object obj)
```
    Overrides:
    
    equals in class java.lang.Object

Class UpdateItemRequest

Constructor Summary

Method Summary

Methods inherited from class com.amazonaws.AmazonWebServiceRequest

Methods inherited from class java.lang.Object

Constructor Detail

UpdateItemRequest

UpdateItemRequest

UpdateItemRequest

UpdateItemRequest

Method Detail

getTableName

setTableName

withTableName

getKey

setKey

withKey

addKeyEntry

clearKeyEntries

getAttributeUpdates

setAttributeUpdates

withAttributeUpdates

addAttributeUpdatesEntry

clearAttributeUpdatesEntries

getExpected

setExpected

withExpected

addExpectedEntry

clearExpectedEntries

getConditionalOperator

setConditionalOperator

withConditionalOperator

setConditionalOperator

withConditionalOperator

getReturnValues

setReturnValues

withReturnValues

setReturnValues

withReturnValues

getReturnConsumedCapacity

setReturnConsumedCapacity

withReturnConsumedCapacity

setReturnConsumedCapacity

withReturnConsumedCapacity

getReturnItemCollectionMetrics

setReturnItemCollectionMetrics

withReturnItemCollectionMetrics

setReturnItemCollectionMetrics

withReturnItemCollectionMetrics

getUpdateExpression

setUpdateExpression

withUpdateExpression

getConditionExpression

setConditionExpression

withConditionExpression

getExpressionAttributeNames

setExpressionAttributeNames

withExpressionAttributeNames

addExpressionAttributeNamesEntry

clearExpressionAttributeNamesEntries

getExpressionAttributeValues

setExpressionAttributeValues

withExpressionAttributeValues

addExpressionAttributeValuesEntry

clearExpressionAttributeValuesEntries

toString

hashCode

equals