View source: R/dynamodb_operations.R
dynamodb_get_item | R Documentation |
The get_item
operation returns a set of attributes for the item with the given primary key. If there is no matching item, get_item
does not return any data and there will be no Item
element in the response.
See https://www.paws-r-sdk.com/docs/dynamodb_get_item/ for full documentation.
dynamodb_get_item(
TableName,
Key,
AttributesToGet = NULL,
ConsistentRead = NULL,
ReturnConsumedCapacity = NULL,
ProjectionExpression = NULL,
ExpressionAttributeNames = NULL
)
TableName |
[required] The name of the table containing the requested item. You can also provide the Amazon Resource Name (ARN) of the table in this parameter. |
Key |
[required] A map of attribute names to 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. |
AttributesToGet |
This is a legacy parameter. Use |
ConsistentRead |
Determines the read consistency model: If set to |
ReturnConsumedCapacity |
|
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 are returned. If any of the requested attributes are not found, they do not appear in the result. For more information, see Specifying Item Attributes in the Amazon DynamoDB Developer Guide. |
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 Specifying Item Attributes in the Amazon DynamoDB Developer Guide. |
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