public class BatchGetItemRequest extends AmazonWebServiceRequest implements Serializable, Cloneable
BatchGetItem operation.
The BatchGetItem operation returns the attributes of one or more items from one or more tables. You identify requested items by primary key.
A single operation can retrieve up to 16 MB of data, which can contain as many as 100 items. BatchGetItem will return a partial result if the response size limit is exceeded, the table's provisioned throughput is exceeded, or an internal processing failure occurs. If a partial result is returned, the operation returns a value for UnprocessedKeys . You can use this value to retry the operation starting with the next item to get.
For example, if you ask to retrieve 100 items, but each individual item is 300 KB in size, the system returns 52 items (so as not to exceed the 16 MB limit). It also returns an appropriate UnprocessedKeys value so you can get the next page of results. If desired, your application can include its own logic to assemble the pages of results into one data set.
If none of the items can be processed due to insufficient provisioned throughput on all of the tables in the request, then BatchGetItem will return a ProvisionedThroughputExceededException . If at least one of the items is successfully processed, then BatchGetItem completes successfully, while returning the keys of the unread items in UnprocessedKeys .
IMPORTANT: If DynamoDB returns any unprocessed items, you should retry the batch operation on those items. However, we strongly recommend that you use an exponential backoff algorithm. If you retry the batch operation immediately, the underlying read or write requests can still fail due to throttling on the individual tables. If you delay the batch operation using exponential backoff, the individual requests in the batch are much more likely to succeed. For more information, see Batch Operations and Error Handling in the Amazon DynamoDB Developer Guide.
By default, BatchGetItem performs eventually consistent reads
on every table in the request. If you want strongly consistent reads
instead, you can set ConsistentRead to true for
any or all tables.
In order to minimize response latency, BatchGetItem retrieves items in parallel.
When designing your application, keep in mind that DynamoDB does not return attributes in any particular order. To help parse the response by item, include the primary key values for the items in your request in the AttributesToGet parameter.
If a requested item does not exist, it is not returned in the result. Requests for nonexistent items consume the minimum read capacity units according to the type of read. For more information, see Capacity Units Calculations in the Amazon DynamoDB Developer Guide .
NOOP| Constructor and Description |
|---|
BatchGetItemRequest()
Default constructor for a new BatchGetItemRequest object.
|
BatchGetItemRequest(Map<String,KeysAndAttributes> requestItems)
Constructs a new BatchGetItemRequest object.
|
BatchGetItemRequest(Map<String,KeysAndAttributes> requestItems,
ReturnConsumedCapacity returnConsumedCapacity)
Constructs a new BatchGetItemRequest object.
|
BatchGetItemRequest(Map<String,KeysAndAttributes> requestItems,
String returnConsumedCapacity)
Constructs a new BatchGetItemRequest object.
|
| Modifier and Type | Method and Description |
|---|---|
BatchGetItemRequest |
addRequestItemsEntry(String key,
KeysAndAttributes value)
A map of one or more table names and, for each table, a map that
describes one or more items to retrieve from that table.
|
BatchGetItemRequest |
clearRequestItemsEntries()
Removes all the entries added into RequestItems.
|
BatchGetItemRequest |
clone() |
boolean |
equals(Object obj) |
Map<String,KeysAndAttributes> |
getRequestItems()
A map of one or more table names and, for each table, a map that
describes one or more items to retrieve from that table.
|
String |
getReturnConsumedCapacity()
A value that if set to
TOTAL, the response includes
ConsumedCapacity data for tables and indexes. |
int |
hashCode() |
void |
setRequestItems(Map<String,KeysAndAttributes> requestItems)
A map of one or more table names and, for each table, a map that
describes one or more items to retrieve from that table.
|
void |
setReturnConsumedCapacity(ReturnConsumedCapacity returnConsumedCapacity)
A value that if set to
TOTAL, the response includes
ConsumedCapacity data for tables and indexes. |
void |
setReturnConsumedCapacity(String returnConsumedCapacity)
A value that if set to
TOTAL, the response includes
ConsumedCapacity data for tables and indexes. |
String |
toString()
Returns a string representation of this object; useful for testing and
debugging.
|
BatchGetItemRequest |
withRequestItems(Map<String,KeysAndAttributes> requestItems)
A map of one or more table names and, for each table, a map that
describes one or more items to retrieve from that table.
|
BatchGetItemRequest |
withReturnConsumedCapacity(ReturnConsumedCapacity returnConsumedCapacity)
A value that if set to
TOTAL, the response includes
ConsumedCapacity data for tables and indexes. |
BatchGetItemRequest |
withReturnConsumedCapacity(String returnConsumedCapacity)
A value that if set to
TOTAL, the response includes
ConsumedCapacity data for tables and indexes. |
copyBaseTo, copyPrivateRequestParameters, getCustomRequestHeaders, getGeneralProgressListener, getReadLimit, getRequestClientOptions, getRequestCredentials, getRequestMetricCollector, putCustomRequestHeader, setGeneralProgressListener, setRequestCredentials, setRequestMetricCollector, withGeneralProgressListener, withRequestMetricCollectorpublic BatchGetItemRequest()
public BatchGetItemRequest(Map<String,KeysAndAttributes> requestItems)
requestItems - A map of one or more table names and, for each
table, a map that describes one or more items to retrieve from that
table. Each table name can be used only once per BatchGetItem
request. Each element in the map of items to retrieve consists of the following:
ConsistentRead - If
true, a strongly consistent read is used; if
false (the default), an eventually consistent read is
used.
ExpressionAttributeNames - One or more substitution tokens for attribute names in the ProjectionExpression parameter. 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.
Keys - An array of primary key attribute values that define specific items in the table. For each primary key, you must provide all of the key attributes. For example, with a hash type primary key, you only need to provide the hash attribute. For a hash-and-range type primary key, you must provide both the hash attribute and the range attribute.
ProjectionExpression - A string that identifies one or more attributes to retrieve from the table. These attributes can include scalars, sets, or elements of a JSON document. The attributes in the expression must be separated by commas.
If no attribute names are specified, then all attributes will be returned. If any of the requested attributes are not found, they will not appear in the result.
For more information, see Accessing Item Attributes in the Amazon DynamoDB Developer Guide.
AttributesToGet - This is a
legacy parameter, for backward compatibility. New applications should
use ProjectionExpression instead. Do not combine legacy
parameters and expression parameters in a single API call; otherwise,
DynamoDB will return a ValidationException exception. This
parameter allows you to retrieve attributes of type List or Map;
however, it cannot retrieve individual elements within a List or a
Map.
The names of one or more attributes to retrieve. If no attribute names are provided, then all attributes will be returned. If any of the requested attributes are not found, they will not appear in the result.
Note that AttributesToGet has no effect on provisioned throughput consumption. DynamoDB determines capacity units consumed based on item size, not on the amount of data that is returned to an application.
public BatchGetItemRequest(Map<String,KeysAndAttributes> requestItems, String returnConsumedCapacity)
requestItems - A map of one or more table names and, for each
table, a map that describes one or more items to retrieve from that
table. Each table name can be used only once per BatchGetItem
request. Each element in the map of items to retrieve consists of the following:
ConsistentRead - If
true, a strongly consistent read is used; if
false (the default), an eventually consistent read is
used.
ExpressionAttributeNames - One or more substitution tokens for attribute names in the ProjectionExpression parameter. 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.
Keys - An array of primary key attribute values that define specific items in the table. For each primary key, you must provide all of the key attributes. For example, with a hash type primary key, you only need to provide the hash attribute. For a hash-and-range type primary key, you must provide both the hash attribute and the range attribute.
ProjectionExpression - A string that identifies one or more attributes to retrieve from the table. These attributes can include scalars, sets, or elements of a JSON document. The attributes in the expression must be separated by commas.
If no attribute names are specified, then all attributes will be returned. If any of the requested attributes are not found, they will not appear in the result.
For more information, see Accessing Item Attributes in the Amazon DynamoDB Developer Guide.
AttributesToGet - This is a
legacy parameter, for backward compatibility. New applications should
use ProjectionExpression instead. Do not combine legacy
parameters and expression parameters in a single API call; otherwise,
DynamoDB will return a ValidationException exception. This
parameter allows you to retrieve attributes of type List or Map;
however, it cannot retrieve individual elements within a List or a
Map.
The names of one or more attributes to retrieve. If no attribute names are provided, then all attributes will be returned. If any of the requested attributes are not found, they will not appear in the result.
Note that AttributesToGet has no effect on provisioned throughput consumption. DynamoDB determines capacity units consumed based on item size, not on the amount of data that is returned to an application.
returnConsumedCapacity - A value that if set to
TOTAL, the response includes ConsumedCapacity data
for tables and indexes. If set to INDEXES, the response
includes ConsumedCapacity for indexes. If set to
NONE (the default), ConsumedCapacity is not
included in the response.public BatchGetItemRequest(Map<String,KeysAndAttributes> requestItems, ReturnConsumedCapacity returnConsumedCapacity)
requestItems - A map of one or more table names and, for each
table, a map that describes one or more items to retrieve from that
table. Each table name can be used only once per BatchGetItem
request. Each element in the map of items to retrieve consists of the following:
ConsistentRead - If
true, a strongly consistent read is used; if
false (the default), an eventually consistent read is
used.
ExpressionAttributeNames - One or more substitution tokens for attribute names in the ProjectionExpression parameter. 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.
Keys - An array of primary key attribute values that define specific items in the table. For each primary key, you must provide all of the key attributes. For example, with a hash type primary key, you only need to provide the hash attribute. For a hash-and-range type primary key, you must provide both the hash attribute and the range attribute.
ProjectionExpression - A string that identifies one or more attributes to retrieve from the table. These attributes can include scalars, sets, or elements of a JSON document. The attributes in the expression must be separated by commas.
If no attribute names are specified, then all attributes will be returned. If any of the requested attributes are not found, they will not appear in the result.
For more information, see Accessing Item Attributes in the Amazon DynamoDB Developer Guide.
AttributesToGet - This is a
legacy parameter, for backward compatibility. New applications should
use ProjectionExpression instead. Do not combine legacy
parameters and expression parameters in a single API call; otherwise,
DynamoDB will return a ValidationException exception. This
parameter allows you to retrieve attributes of type List or Map;
however, it cannot retrieve individual elements within a List or a
Map.
The names of one or more attributes to retrieve. If no attribute names are provided, then all attributes will be returned. If any of the requested attributes are not found, they will not appear in the result.
Note that AttributesToGet has no effect on provisioned throughput consumption. DynamoDB determines capacity units consumed based on item size, not on the amount of data that is returned to an application.
returnConsumedCapacity - A value that if set to
TOTAL, the response includes ConsumedCapacity data
for tables and indexes. If set to INDEXES, the response
includes ConsumedCapacity for indexes. If set to
NONE (the default), ConsumedCapacity is not
included in the response.public Map<String,KeysAndAttributes> getRequestItems()
Each element in the map of items to retrieve consists of the following:
ConsistentRead - If true, a strongly
consistent read is used; if false (the default), an
eventually consistent read is used.
ExpressionAttributeNames - One or more substitution tokens for attribute names in the ProjectionExpression parameter. 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.
Keys - An array of primary key attribute values that define specific items in the table. For each primary key, you must provide all of the key attributes. For example, with a hash type primary key, you only need to provide the hash attribute. For a hash-and-range type primary key, you must provide both the hash attribute and the range attribute.
ProjectionExpression - A string that identifies one or more attributes to retrieve from the table. These attributes can include scalars, sets, or elements of a JSON document. The attributes in the expression must be separated by commas.
If no attribute names are specified, then all attributes will be returned. If any of the requested attributes are not found, they will not appear in the result.
For more information, see Accessing Item Attributes in the Amazon DynamoDB Developer Guide.
AttributesToGet - This is a
legacy parameter, for backward compatibility. New applications should
use ProjectionExpression instead. Do not combine legacy
parameters and expression parameters in a single API call; otherwise,
DynamoDB will return a ValidationException exception. This
parameter allows you to retrieve attributes of type List or Map;
however, it cannot retrieve individual elements within a List or a
Map.
The names of one or more attributes to retrieve. If no attribute names are provided, then all attributes will be returned. If any of the requested attributes are not found, they will not appear in the result.
Note that AttributesToGet has no effect on provisioned throughput consumption. DynamoDB determines capacity units consumed based on item size, not on the amount of data that is returned to an application.
Constraints:
Length: 1 - 100
Each element in the map of items to retrieve consists of the following:
ConsistentRead - If true, a strongly
consistent read is used; if false (the default), an
eventually consistent read is used.
ExpressionAttributeNames - One or more substitution tokens for attribute names in the ProjectionExpression parameter. 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.
Keys - An array of primary key attribute values that define specific items in the table. For each primary key, you must provide all of the key attributes. For example, with a hash type primary key, you only need to provide the hash attribute. For a hash-and-range type primary key, you must provide both the hash attribute and the range attribute.
ProjectionExpression - A string that identifies one or more attributes to retrieve from the table. These attributes can include scalars, sets, or elements of a JSON document. The attributes in the expression must be separated by commas.
If no attribute names are specified, then all attributes will be returned. If any of the requested attributes are not found, they will not appear in the result.
For more information, see Accessing Item Attributes in the Amazon DynamoDB Developer Guide.
AttributesToGet - This is a
legacy parameter, for backward compatibility. New applications should
use ProjectionExpression instead. Do not combine legacy
parameters and expression parameters in a single API call; otherwise,
DynamoDB will return a ValidationException exception. This
parameter allows you to retrieve attributes of type List or Map;
however, it cannot retrieve individual elements within a List or a
Map.
The names of one or more attributes to retrieve. If no attribute names are provided, then all attributes will be returned. If any of the requested attributes are not found, they will not appear in the result.
Note that AttributesToGet has no effect on provisioned throughput consumption. DynamoDB determines capacity units consumed based on item size, not on the amount of data that is returned to an application.
public void setRequestItems(Map<String,KeysAndAttributes> requestItems)
Each element in the map of items to retrieve consists of the following:
ConsistentRead - If true, a strongly
consistent read is used; if false (the default), an
eventually consistent read is used.
ExpressionAttributeNames - One or more substitution tokens for attribute names in the ProjectionExpression parameter. 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.
Keys - An array of primary key attribute values that define specific items in the table. For each primary key, you must provide all of the key attributes. For example, with a hash type primary key, you only need to provide the hash attribute. For a hash-and-range type primary key, you must provide both the hash attribute and the range attribute.
ProjectionExpression - A string that identifies one or more attributes to retrieve from the table. These attributes can include scalars, sets, or elements of a JSON document. The attributes in the expression must be separated by commas.
If no attribute names are specified, then all attributes will be returned. If any of the requested attributes are not found, they will not appear in the result.
For more information, see Accessing Item Attributes in the Amazon DynamoDB Developer Guide.
AttributesToGet - This is a
legacy parameter, for backward compatibility. New applications should
use ProjectionExpression instead. Do not combine legacy
parameters and expression parameters in a single API call; otherwise,
DynamoDB will return a ValidationException exception. This
parameter allows you to retrieve attributes of type List or Map;
however, it cannot retrieve individual elements within a List or a
Map.
The names of one or more attributes to retrieve. If no attribute names are provided, then all attributes will be returned. If any of the requested attributes are not found, they will not appear in the result.
Note that AttributesToGet has no effect on provisioned throughput consumption. DynamoDB determines capacity units consumed based on item size, not on the amount of data that is returned to an application.
Constraints:
Length: 1 - 100
requestItems - A map of one or more table names and, for each table, a map that
describes one or more items to retrieve from that table. Each table
name can be used only once per BatchGetItem request. Each element in the map of items to retrieve consists of the following:
ConsistentRead - If true, a strongly
consistent read is used; if false (the default), an
eventually consistent read is used.
ExpressionAttributeNames - One or more substitution tokens for attribute names in the ProjectionExpression parameter. 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.
Keys - An array of primary key attribute values that define specific items in the table. For each primary key, you must provide all of the key attributes. For example, with a hash type primary key, you only need to provide the hash attribute. For a hash-and-range type primary key, you must provide both the hash attribute and the range attribute.
ProjectionExpression - A string that identifies one or more attributes to retrieve from the table. These attributes can include scalars, sets, or elements of a JSON document. The attributes in the expression must be separated by commas.
If no attribute names are specified, then all attributes will be returned. If any of the requested attributes are not found, they will not appear in the result.
For more information, see Accessing Item Attributes in the Amazon DynamoDB Developer Guide.
AttributesToGet - This is a
legacy parameter, for backward compatibility. New applications should
use ProjectionExpression instead. Do not combine legacy
parameters and expression parameters in a single API call; otherwise,
DynamoDB will return a ValidationException exception. This
parameter allows you to retrieve attributes of type List or Map;
however, it cannot retrieve individual elements within a List or a
Map.
The names of one or more attributes to retrieve. If no attribute names are provided, then all attributes will be returned. If any of the requested attributes are not found, they will not appear in the result.
Note that AttributesToGet has no effect on provisioned throughput consumption. DynamoDB determines capacity units consumed based on item size, not on the amount of data that is returned to an application.
public BatchGetItemRequest withRequestItems(Map<String,KeysAndAttributes> requestItems)
Each element in the map of items to retrieve consists of the following:
ConsistentRead - If true, a strongly
consistent read is used; if false (the default), an
eventually consistent read is used.
ExpressionAttributeNames - One or more substitution tokens for attribute names in the ProjectionExpression parameter. 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.
Keys - An array of primary key attribute values that define specific items in the table. For each primary key, you must provide all of the key attributes. For example, with a hash type primary key, you only need to provide the hash attribute. For a hash-and-range type primary key, you must provide both the hash attribute and the range attribute.
ProjectionExpression - A string that identifies one or more attributes to retrieve from the table. These attributes can include scalars, sets, or elements of a JSON document. The attributes in the expression must be separated by commas.
If no attribute names are specified, then all attributes will be returned. If any of the requested attributes are not found, they will not appear in the result.
For more information, see Accessing Item Attributes in the Amazon DynamoDB Developer Guide.
AttributesToGet - This is a
legacy parameter, for backward compatibility. New applications should
use ProjectionExpression instead. Do not combine legacy
parameters and expression parameters in a single API call; otherwise,
DynamoDB will return a ValidationException exception. This
parameter allows you to retrieve attributes of type List or Map;
however, it cannot retrieve individual elements within a List or a
Map.
The names of one or more attributes to retrieve. If no attribute names are provided, then all attributes will be returned. If any of the requested attributes are not found, they will not appear in the result.
Note that AttributesToGet has no effect on provisioned throughput consumption. DynamoDB determines capacity units consumed based on item size, not on the amount of data that is returned to an application.
Returns a reference to this object so that method calls can be chained together.
Constraints:
Length: 1 - 100
requestItems - A map of one or more table names and, for each table, a map that
describes one or more items to retrieve from that table. Each table
name can be used only once per BatchGetItem request. Each element in the map of items to retrieve consists of the following:
ConsistentRead - If true, a strongly
consistent read is used; if false (the default), an
eventually consistent read is used.
ExpressionAttributeNames - One or more substitution tokens for attribute names in the ProjectionExpression parameter. 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.
Keys - An array of primary key attribute values that define specific items in the table. For each primary key, you must provide all of the key attributes. For example, with a hash type primary key, you only need to provide the hash attribute. For a hash-and-range type primary key, you must provide both the hash attribute and the range attribute.
ProjectionExpression - A string that identifies one or more attributes to retrieve from the table. These attributes can include scalars, sets, or elements of a JSON document. The attributes in the expression must be separated by commas.
If no attribute names are specified, then all attributes will be returned. If any of the requested attributes are not found, they will not appear in the result.
For more information, see Accessing Item Attributes in the Amazon DynamoDB Developer Guide.
AttributesToGet - This is a
legacy parameter, for backward compatibility. New applications should
use ProjectionExpression instead. Do not combine legacy
parameters and expression parameters in a single API call; otherwise,
DynamoDB will return a ValidationException exception. This
parameter allows you to retrieve attributes of type List or Map;
however, it cannot retrieve individual elements within a List or a
Map.
The names of one or more attributes to retrieve. If no attribute names are provided, then all attributes will be returned. If any of the requested attributes are not found, they will not appear in the result.
Note that AttributesToGet has no effect on provisioned throughput consumption. DynamoDB determines capacity units consumed based on item size, not on the amount of data that is returned to an application.
public BatchGetItemRequest addRequestItemsEntry(String key, KeysAndAttributes value)
Each element in the map of items to retrieve consists of the following:
ConsistentRead - If true, a strongly
consistent read is used; if false (the default), an
eventually consistent read is used.
ExpressionAttributeNames - One or more substitution tokens for attribute names in the ProjectionExpression parameter. 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.
Keys - An array of primary key attribute values that define specific items in the table. For each primary key, you must provide all of the key attributes. For example, with a hash type primary key, you only need to provide the hash attribute. For a hash-and-range type primary key, you must provide both the hash attribute and the range attribute.
ProjectionExpression - A string that identifies one or more attributes to retrieve from the table. These attributes can include scalars, sets, or elements of a JSON document. The attributes in the expression must be separated by commas.
If no attribute names are specified, then all attributes will be returned. If any of the requested attributes are not found, they will not appear in the result.
For more information, see Accessing Item Attributes in the Amazon DynamoDB Developer Guide.
AttributesToGet - This is a
legacy parameter, for backward compatibility. New applications should
use ProjectionExpression instead. Do not combine legacy
parameters and expression parameters in a single API call; otherwise,
DynamoDB will return a ValidationException exception. This
parameter allows you to retrieve attributes of type List or Map;
however, it cannot retrieve individual elements within a List or a
Map.
The names of one or more attributes to retrieve. If no attribute names are provided, then all attributes will be returned. If any of the requested attributes are not found, they will not appear in the result.
Note that AttributesToGet has no effect on provisioned throughput consumption. DynamoDB determines capacity units consumed based on item size, not on the amount of data that is returned to an application.
The method adds a new key-value pair into RequestItems parameter, and returns a reference to this object so that method calls can be chained together.
Constraints:
Length: 1 - 100
key - The key of the entry to be added into RequestItems.value - The corresponding value of the entry to be added into RequestItems.public BatchGetItemRequest clearRequestItemsEntries()
Returns a reference to this object so that method calls can be chained together.
public String getReturnConsumedCapacity()
TOTAL, the response includes
ConsumedCapacity data for tables and indexes. If set to
INDEXES, the response includes ConsumedCapacity
for indexes. If set to NONE (the default),
ConsumedCapacity is not included in the response.
Constraints:
Allowed Values: INDEXES, TOTAL, NONE
TOTAL, the response includes
ConsumedCapacity data for tables and indexes. If set to
INDEXES, the response includes ConsumedCapacity
for indexes. If set to NONE (the default),
ConsumedCapacity is not included in the response.ReturnConsumedCapacitypublic void setReturnConsumedCapacity(String returnConsumedCapacity)
TOTAL, the response includes
ConsumedCapacity data for tables and indexes. If set to
INDEXES, the response includes ConsumedCapacity
for indexes. If set to NONE (the default),
ConsumedCapacity is not included in the response.
Constraints:
Allowed Values: INDEXES, TOTAL, NONE
returnConsumedCapacity - A value that if set to TOTAL, the response includes
ConsumedCapacity data for tables and indexes. If set to
INDEXES, the response includes ConsumedCapacity
for indexes. If set to NONE (the default),
ConsumedCapacity is not included in the response.ReturnConsumedCapacitypublic BatchGetItemRequest withReturnConsumedCapacity(String returnConsumedCapacity)
TOTAL, the response includes
ConsumedCapacity data for tables and indexes. If set to
INDEXES, the response includes ConsumedCapacity
for indexes. If set to NONE (the default),
ConsumedCapacity is not included in the response.
Returns a reference to this object so that method calls can be chained together.
Constraints:
Allowed Values: INDEXES, TOTAL, NONE
returnConsumedCapacity - A value that if set to TOTAL, the response includes
ConsumedCapacity data for tables and indexes. If set to
INDEXES, the response includes ConsumedCapacity
for indexes. If set to NONE (the default),
ConsumedCapacity is not included in the response.ReturnConsumedCapacitypublic void setReturnConsumedCapacity(ReturnConsumedCapacity returnConsumedCapacity)
TOTAL, the response includes
ConsumedCapacity data for tables and indexes. If set to
INDEXES, the response includes ConsumedCapacity
for indexes. If set to NONE (the default),
ConsumedCapacity is not included in the response.
Constraints:
Allowed Values: INDEXES, TOTAL, NONE
returnConsumedCapacity - A value that if set to TOTAL, the response includes
ConsumedCapacity data for tables and indexes. If set to
INDEXES, the response includes ConsumedCapacity
for indexes. If set to NONE (the default),
ConsumedCapacity is not included in the response.ReturnConsumedCapacitypublic BatchGetItemRequest withReturnConsumedCapacity(ReturnConsumedCapacity returnConsumedCapacity)
TOTAL, the response includes
ConsumedCapacity data for tables and indexes. If set to
INDEXES, the response includes ConsumedCapacity
for indexes. If set to NONE (the default),
ConsumedCapacity is not included in the response.
Returns a reference to this object so that method calls can be chained together.
Constraints:
Allowed Values: INDEXES, TOTAL, NONE
returnConsumedCapacity - A value that if set to TOTAL, the response includes
ConsumedCapacity data for tables and indexes. If set to
INDEXES, the response includes ConsumedCapacity
for indexes. If set to NONE (the default),
ConsumedCapacity is not included in the response.ReturnConsumedCapacitypublic String toString()
toString in class ObjectObject.toString()public BatchGetItemRequest clone()
clone in class AmazonWebServiceRequestCopyright © 2015. All rights reserved.