NAME
Paws::DynamoDB::KeysAndAttributes
USAGE
This class represents one of two things:
Arguments in a call to a service
Use the attributes of this class as arguments to methods. You shouldn't make instances of this class. Each attribute should be used as a named argument in the calls that expect this type of object.
As an example, if Att1 is expected to be a Paws::DynamoDB::KeysAndAttributes object:
$service_obj->Method(Att1 => { AttributesToGet => $value, ..., ProjectionExpression => $value });Results returned from an API call
Use accessors for each attribute. If Att1 is expected to be an Paws::DynamoDB::KeysAndAttributes object:
$result = $service_obj->Method(...);
$result->Att1->AttributesToGetDESCRIPTION
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.
ATTRIBUTES
AttributesToGet => ArrayRef[Str|Undef]
This is a legacy parameter. Use C<ProjectionExpression> instead. For
more information, see Legacy Conditional Parameters
(https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/LegacyConditionalParameters.html)
in the I<Amazon DynamoDB Developer Guide>.ConsistentRead => Bool
The consistency of a read operation. If set to C<true>, then a strongly
consistent read is used; otherwise, an eventually consistent read is
used.ExpressionAttributeNames => Paws::DynamoDB::ExpressionAttributeNameMap
One or more substitution tokens for attribute names in an expression.
The following are some use cases for using C<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 (https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/ReservedWords.html) 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 (https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/Expressions.AccessingItemAttributes.html) in the Amazon DynamoDB Developer Guide.
REQUIRED Keys => ArrayRef[Paws::DynamoDB::Key]
The primary key attribute values that define the items and the
attributes associated with the items.ProjectionExpression => Str
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 C<ProjectionExpression> 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 (https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/Expressions.AccessingItemAttributes.html) in the Amazon DynamoDB Developer Guide.
SEE ALSO
This class forms part of Paws, describing an object used in Paws::DynamoDB
BUGS and CONTRIBUTIONS
The source code is located here: https://github.com/pplu/aws-sdk-perl
Please report bugs to: https://github.com/pplu/aws-sdk-perl/issues