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Represents a set of primary keys and, for each key, the attributes to retrieve from 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. For a composite primary key, you must provide both the partition key and the sort key.
public class KeysAndAttributes
The KeysAndAttributes type exposes the following members
Gets and sets the property AttributesToGet.
This is a legacy parameter. Use
Gets and sets the property ConsistentRead.
The consistency of a read operation. If set to
Gets and sets the property ExpressionAttributeNames.
One or more substitution tokens for attribute names in an expression. The following
are some use cases for using
Use the # character in an expression to dereference an attribute name. For example, consider the following attribute name:
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
You could then use this substitution in an expression, as in this example:
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.
Gets and sets the property Keys.
The primary key attribute values that define the items and the attributes associated with the items.
Gets and sets the property 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
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.
Supported in: 1.3
Supported in: 4.5, 4.0, 3.5
Portable Class Library:
Supported in: Windows Store Apps
Supported in: Windows Phone 8.1
Supported in: Xamarin Android
Supported in: Xamarin iOS (Unified)
Supported in: Xamarin.Forms
Supported Versions: 4.6 and above
Supported Platforms: Android, iOS, Standalone