C# Класс Amazon.DynamoDBv2.Model.BatchGetItemRequest

Container for the parameters to the 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 1 MB of data, which can comprise 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 50 KB in size, the system returns 20 items (1 MB) and 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 dataset.

If no items can be processed because of insufficient provisioned throughput on each of the tables involved in the request, BatchGetItem throws ProvisionedThroughputExceededException .

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 fetches items in parallel.

When designing your application, keep in mind that Amazon 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.

Наследование: AmazonDynamoDBv2Request
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Открытые методы

Метод Описание
BatchGetItemRequest ( ) : System

Empty constructor used to set properties independently even when a simple constructor is available
BatchGetItemRequest ( KeysAndAttributes>.Dictionary requestItems ) : System

Instantiates BatchGetItemRequest with the parameterized properties
BatchGetItemRequest ( KeysAndAttributes>.Dictionary requestItems, ReturnConsumedCapacity returnConsumedCapacity ) : System

Instantiates BatchGetItemRequest with the parameterized properties

Приватные методы

Метод Описание
IsSetRequestItems ( ) : bool
IsSetReturnConsumedCapacity ( ) : bool

Описание методов

BatchGetItemRequest() публичный Метод

Empty constructor used to set properties independently even when a simple constructor is available
public BatchGetItemRequest ( ) : System
Результат System

BatchGetItemRequest() публичный Метод

Instantiates BatchGetItemRequest with the parameterized properties
public BatchGetItemRequest ( KeysAndAttributes>.Dictionary requestItems ) : System
requestItems KeysAndAttributes>.Dictionary 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 simple primary key, you only need to provide the partition key value. For a composite key, you must provide both the partition key value and the sort key value.
  • 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.
Результат System

BatchGetItemRequest() публичный Метод

Instantiates BatchGetItemRequest with the parameterized properties
public BatchGetItemRequest ( KeysAndAttributes>.Dictionary requestItems, ReturnConsumedCapacity returnConsumedCapacity ) : System
requestItems KeysAndAttributes>.Dictionary 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 simple primary key, you only need to provide the partition key value. For a composite key, you must provide both the partition key value and the sort key value.
  • 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 ReturnConsumedCapacity Sets the BatchGetItemRequest ReturnConsumedCapacity property
Результат System