[ aws . dynamodb ]

transact-get-items

Description

TransactGetItems is a synchronous operation that atomically retrieves multiple items from one or more tables (but not from indexes) in a single account and Region. A TransactGetItems call can contain up to 100 TransactGetItem objects, each of which contains a Get structure that specifies an item to retrieve from a table in the account and Region. A call to TransactGetItems cannot retrieve items from tables in more than one Amazon Web Services account or Region. The aggregate size of the items in the transaction cannot exceed 4 MB.

DynamoDB rejects the entire TransactGetItems request if any of the following is true:

• A conflicting operation is in the process of updating an item to be read.
• There is insufficient provisioned capacity for the transaction to be completed.
• There is a user error, such as an invalid data format.
• The aggregate size of the items in the transaction exceeded 4 MB.

See also: AWS API Documentation

Synopsis

  transact-get-items
--transact-items <value>
[--return-consumed-capacity <value>]
[--cli-input-json | --cli-input-yaml]
[--generate-cli-skeleton <value>]
[--debug]
[--endpoint-url <value>]
[--no-verify-ssl]
[--no-paginate]
[--output <value>]
[--query <value>]
[--profile <value>]
[--region <value>]
[--version <value>]
[--color <value>]
[--no-sign-request]
[--ca-bundle <value>]
[--cli-read-timeout <value>]
[--cli-connect-timeout <value>]
[--cli-binary-format <value>]
[--no-cli-pager]
[--cli-auto-prompt]
[--no-cli-auto-prompt]

Options

--transact-items (list)

An ordered array of up to 100 TransactGetItem objects, each of which contains a Get structure.

(structure)

Specifies an item to be retrieved as part of the transaction.

Get -> (structure)

Contains the primary key that identifies the item to get, together with the name of the table that contains the item, and optionally the specific attributes of the item to retrieve.

Key -> (map)

A map of attribute names to AttributeValue objects that specifies the primary key of the item to retrieve.

key -> (string)

value -> (structure)

Represents the data for an attribute.

Each attribute value is described as a name-value pair. The name is the data type, and the value is the data itself.

For more information, see Data Types in the Amazon DynamoDB Developer Guide .

S -> (string)

An attribute of type String. For example:

"S": "Hello"

N -> (string)

An attribute of type Number. For example:

"N": "123.45"

Numbers are sent across the network to DynamoDB as strings, to maximize compatibility across languages and libraries. However, DynamoDB treats them as number type attributes for mathematical operations.

B -> (blob)

An attribute of type Binary. For example:

"B": "dGhpcyB0ZXh0IGlzIGJhc2U2NC1lbmNvZGVk"

SS -> (list)

An attribute of type String Set. For example:

"SS": ["Giraffe", "Hippo" ,"Zebra"]

(string)

NS -> (list)

An attribute of type Number Set. For example:

"NS": ["42.2", "-19", "7.5", "3.14"]

Numbers are sent across the network to DynamoDB as strings, to maximize compatibility across languages and libraries. However, DynamoDB treats them as number type attributes for mathematical operations.

(string)

BS -> (list)

An attribute of type Binary Set. For example:

"BS": ["U3Vubnk=", "UmFpbnk=", "U25vd3k="]

(blob)

M -> (map)

An attribute of type Map. For example:

"M": {"Name": {"S": "Joe"}, "Age": {"N": "35"}}

key -> (string)

value -> (structure)

Represents the data for an attribute.

Each attribute value is described as a name-value pair. The name is the data type, and the value is the data itself.

For more information, see Data Types in the Amazon DynamoDB Developer Guide .

S -> (string)

An attribute of type String. For example:

"S": "Hello"

N -> (string)

An attribute of type Number. For example:

"N": "123.45"

Numbers are sent across the network to DynamoDB as strings, to maximize compatibility across languages and libraries. However, DynamoDB treats them as number type attributes for mathematical operations.

B -> (blob)

An attribute of type Binary. For example:

"B": "dGhpcyB0ZXh0IGlzIGJhc2U2NC1lbmNvZGVk"

SS -> (list)

An attribute of type String Set. For example:

"SS": ["Giraffe", "Hippo" ,"Zebra"]

(string)

NS -> (list)

An attribute of type Number Set. For example:

"NS": ["42.2", "-19", "7.5", "3.14"]

Numbers are sent across the network to DynamoDB as strings, to maximize compatibility across languages and libraries. However, DynamoDB treats them as number type attributes for mathematical operations.

(string)

BS -> (list)

An attribute of type Binary Set. For example:

"BS": ["U3Vubnk=", "UmFpbnk=", "U25vd3k="]

(blob)

M -> (map)

An attribute of type Map. For example:

"M": {"Name": {"S": "Joe"}, "Age": {"N": "35"}}

key -> (string)

( … recursive … )

L -> (list)

An attribute of type List. For example:

"L": [ {"S": "Cookies"} , {"S": "Coffee"}, {"N": "3.14159"}]

( … recursive … )

NULL -> (boolean)

An attribute of type Null. For example:

"NULL": true

BOOL -> (boolean)

An attribute of type Boolean. For example:

"BOOL": true

L -> (list)

An attribute of type List. For example:

"L": [ {"S": "Cookies"} , {"S": "Coffee"}, {"N": "3.14159"}]

(structure)

Represents the data for an attribute.

Each attribute value is described as a name-value pair. The name is the data type, and the value is the data itself.

For more information, see Data Types in the Amazon DynamoDB Developer Guide .

S -> (string)

An attribute of type String. For example:

"S": "Hello"

N -> (string)

An attribute of type Number. For example:

"N": "123.45"

Numbers are sent across the network to DynamoDB as strings, to maximize compatibility across languages and libraries. However, DynamoDB treats them as number type attributes for mathematical operations.

B -> (blob)

An attribute of type Binary. For example:

"B": "dGhpcyB0ZXh0IGlzIGJhc2U2NC1lbmNvZGVk"

SS -> (list)

An attribute of type String Set. For example:

"SS": ["Giraffe", "Hippo" ,"Zebra"]

(string)

NS -> (list)

An attribute of type Number Set. For example:

"NS": ["42.2", "-19", "7.5", "3.14"]

Numbers are sent across the network to DynamoDB as strings, to maximize compatibility across languages and libraries. However, DynamoDB treats them as number type attributes for mathematical operations.

(string)

BS -> (list)

An attribute of type Binary Set. For example:

"BS": ["U3Vubnk=", "UmFpbnk=", "U25vd3k="]

(blob)

M -> (map)

An attribute of type Map. For example:

"M": {"Name": {"S": "Joe"}, "Age": {"N": "35"}}

key -> (string)

( … recursive … )

L -> (list)

An attribute of type List. For example:

"L": [ {"S": "Cookies"} , {"S": "Coffee"}, {"N": "3.14159"}]

( … recursive … )

NULL -> (boolean)

An attribute of type Null. For example:

"NULL": true

BOOL -> (boolean)

An attribute of type Boolean. For example:

"BOOL": true

NULL -> (boolean)

An attribute of type Null. For example:

"NULL": true

BOOL -> (boolean)

An attribute of type Boolean. For example:

"BOOL": true

TableName -> (string)

The name of the table from which to retrieve the specified item. You can also provide the Amazon Resource Name (ARN) of the table in this parameter.

ProjectionExpression -> (string)

A string that identifies one or more attributes of the specified item to retrieve from the table. The attributes in the expression must be separated by commas. If no attribute names are specified, then all attributes of the specified item are returned. If any of the requested attributes are not found, they do not appear in the result.

ExpressionAttributeNames -> (map)

One or more substitution tokens for attribute names in the ProjectionExpression parameter.

key -> (string)

value -> (string)

JSON Syntax:

[
  {
    "Get": {
      "Key": {"string": {
            "S": "string",
            "N": "string",
            "B": blob,
            "SS": ["string", ...],
            "NS": ["string", ...],
            "BS": [blob, ...],
            "M": {"string": {
                  "S": "string",
                  "N": "string",
                  "B": blob,
                  "SS": ["string", ...],
                  "NS": ["string", ...],
                  "BS": [blob, ...],
                  "M": {"string": { ... recursive ... }
                    ...},
                  "L": [
                    { ... recursive ... }
                    ...
                  ],
                  "NULL": true|false,
                  "BOOL": true|false
                }
              ...},
            "L": [
              {
                "S": "string",
                "N": "string",
                "B": blob,
                "SS": ["string", ...],
                "NS": ["string", ...],
                "BS": [blob, ...],
                "M": {"string": { ... recursive ... }
                  ...},
                "L": [
                  { ... recursive ... }
                  ...
                ],
                "NULL": true|false,
                "BOOL": true|false
              }
              ...
            ],
            "NULL": true|false,
            "BOOL": true|false
          }
        ...},
      "TableName": "string",
      "ProjectionExpression": "string",
      "ExpressionAttributeNames": {"string": "string"
        ...}
    }
  }
  ...
]

--return-consumed-capacity (string)

A value of TOTAL causes consumed capacity information to be returned, and a value of NONE prevents that information from being returned. No other value is valid.

Possible values:

• INDEXES
• TOTAL
• NONE

--cli-input-json | --cli-input-yaml (string) Reads arguments from the JSON string provided. The JSON string follows the format provided by --generate-cli-skeleton. If other arguments are provided on the command line, those values will override the JSON-provided values. It is not possible to pass arbitrary binary values using a JSON-provided value as the string will be taken literally. This may not be specified along with --cli-input-yaml.

--generate-cli-skeleton (string) Prints a JSON skeleton to standard output without sending an API request. If provided with no value or the value input, prints a sample input JSON that can be used as an argument for --cli-input-json. Similarly, if provided yaml-input it will print a sample input YAML that can be used with --cli-input-yaml. If provided with the value output, it validates the command inputs and returns a sample output JSON for that command. The generated JSON skeleton is not stable between versions of the AWS CLI and there are no backwards compatibility guarantees in the JSON skeleton generated.

Global Options

--debug (boolean)

Turn on debug logging.

--endpoint-url (string)

Override command’s default URL with the given URL.

--no-verify-ssl (boolean)

By default, the AWS CLI uses SSL when communicating with AWS services. For each SSL connection, the AWS CLI will verify SSL certificates. This option overrides the default behavior of verifying SSL certificates.

--no-paginate (boolean)

Disable automatic pagination. If automatic pagination is disabled, the AWS CLI will only make one call, for the first page of results.

--output (string)

The formatting style for command output.

• json
• text
• table
• yaml
• yaml-stream

--query (string)

A JMESPath query to use in filtering the response data.

--profile (string)

Use a specific profile from your credential file.

--region (string)

The region to use. Overrides config/env settings.

--version (string)

Display the version of this tool.

--color (string)

Turn on/off color output.

• on
• off
• auto

--no-sign-request (boolean)

Do not sign requests. Credentials will not be loaded if this argument is provided.

--ca-bundle (string)

The CA certificate bundle to use when verifying SSL certificates. Overrides config/env settings.

--cli-read-timeout (int)

The maximum socket read time in seconds. If the value is set to 0, the socket read will be blocking and not timeout. The default value is 60 seconds.

--cli-connect-timeout (int)

The maximum socket connect time in seconds. If the value is set to 0, the socket connect will be blocking and not timeout. The default value is 60 seconds.

--cli-binary-format (string)

The formatting style to be used for binary blobs. The default format is base64. The base64 format expects binary blobs to be provided as a base64 encoded string. The raw-in-base64-out format preserves compatibility with AWS CLI V1 behavior and binary values must be passed literally. When providing contents from a file that map to a binary blob fileb:// will always be treated as binary and use the file contents directly regardless of the cli-binary-format setting. When using file:// the file contents will need to properly formatted for the configured cli-binary-format.

• base64
• raw-in-base64-out

--no-cli-pager (boolean)

Disable cli pager for output.

--cli-auto-prompt (boolean)

Automatically prompt for CLI input parameters.

--no-cli-auto-prompt (boolean)

Disable automatically prompt for CLI input parameters.

Examples

Note

To use the following examples, you must have the AWS CLI installed and configured. See the Getting started guide in the AWS CLI User Guide for more information.

Unless otherwise stated, all examples have unix-like quotation rules. These examples will need to be adapted to your terminal’s quoting rules. See Using quotation marks with strings in the AWS CLI User Guide .

To retrieve multiple items atomically from one or more tables

The following transact-get-items example retrieves multiple items atomically.

aws dynamodb transact-get-items \
    --transact-items file://transact-items.json \
    --return-consumed-capacity TOTAL

Contents of transact-items.json:

[
    {
        "Get": {
            "Key": {
                "Artist": {"S": "Acme Band"},
                "SongTitle": {"S": "Happy Day"}
            },
            "TableName": "MusicCollection"
        }
    },
    {
        "Get": {
            "Key": {
                "Artist": {"S": "No One You Know"},
                "SongTitle": {"S": "Call Me Today"}
            },
            "TableName": "MusicCollection"
        }
    }
]

Output:

{
    "ConsumedCapacity": [
        {
            "TableName": "MusicCollection",
            "CapacityUnits": 4.0,
            "ReadCapacityUnits": 4.0
        }
    ],
    "Responses": [
        {
            "Item": {
                "AlbumTitle": {
                    "S": "Songs About Life"
                },
                "Artist": {
                    "S": "Acme Band"
                },
                "SongTitle": {
                    "S": "Happy Day"
                }
            }
        },
        {
            "Item": {
                "AlbumTitle": {
                    "S": "Somewhat Famous"
                },
                "Artist": {
                    "S": "No One You Know"
                },
                "SongTitle": {
                    "S": "Call Me Today"
                }
            }
        }
    ]
}

For more information, see Managing Complex Workflows with DynamoDB Transactions in the Amazon DynamoDB Developer Guide.

Output

ConsumedCapacity -> (list)

If the ReturnConsumedCapacity value was TOTAL , this is an array of ConsumedCapacity objects, one for each table addressed by TransactGetItem objects in the TransactItems parameter. These ConsumedCapacity objects report the read-capacity units consumed by the TransactGetItems call in that table.

(structure)

The capacity units consumed by an operation. The data returned includes the total provisioned throughput consumed, along with statistics for the table and any indexes involved in the operation. ConsumedCapacity is only returned if the request asked for it. For more information, see Provisioned capacity mode in the Amazon DynamoDB Developer Guide .

TableName -> (string)

The name of the table that was affected by the operation. If you had specified the Amazon Resource Name (ARN) of a table in the input, you’ll see the table ARN in the response.

CapacityUnits -> (double)

The total number of capacity units consumed by the operation.

ReadCapacityUnits -> (double)

The total number of read capacity units consumed by the operation.

WriteCapacityUnits -> (double)

The total number of write capacity units consumed by the operation.

Table -> (structure)

The amount of throughput consumed on the table affected by the operation.

ReadCapacityUnits -> (double)

The total number of read capacity units consumed on a table or an index.

WriteCapacityUnits -> (double)

The total number of write capacity units consumed on a table or an index.

CapacityUnits -> (double)

The total number of capacity units consumed on a table or an index.

LocalSecondaryIndexes -> (map)

The amount of throughput consumed on each local index affected by the operation.

key -> (string)

value -> (structure)

Represents the amount of provisioned throughput capacity consumed on a table or an index.

ReadCapacityUnits -> (double)

The total number of read capacity units consumed on a table or an index.

WriteCapacityUnits -> (double)

The total number of write capacity units consumed on a table or an index.

CapacityUnits -> (double)

The total number of capacity units consumed on a table or an index.

GlobalSecondaryIndexes -> (map)

The amount of throughput consumed on each global index affected by the operation.

key -> (string)

value -> (structure)

Represents the amount of provisioned throughput capacity consumed on a table or an index.

ReadCapacityUnits -> (double)

The total number of read capacity units consumed on a table or an index.

WriteCapacityUnits -> (double)

The total number of write capacity units consumed on a table or an index.

CapacityUnits -> (double)

The total number of capacity units consumed on a table or an index.

Responses -> (list)

An ordered array of up to 100 ItemResponse objects, each of which corresponds to the TransactGetItem object in the same position in the TransactItems array. Each ItemResponse object contains a Map of the name-value pairs that are the projected attributes of the requested item.

If a requested item could not be retrieved, the corresponding ItemResponse object is Null, or if the requested item has no projected attributes, the corresponding ItemResponse object is an empty Map.

(structure)

Details for the requested item.

Item -> (map)

Map of attribute data consisting of the data type and attribute value.

key -> (string)

value -> (structure)

Represents the data for an attribute.

Each attribute value is described as a name-value pair. The name is the data type, and the value is the data itself.

For more information, see Data Types in the Amazon DynamoDB Developer Guide .

S -> (string)

An attribute of type String. For example:

"S": "Hello"

N -> (string)

An attribute of type Number. For example:

"N": "123.45"

Numbers are sent across the network to DynamoDB as strings, to maximize compatibility across languages and libraries. However, DynamoDB treats them as number type attributes for mathematical operations.

B -> (blob)

An attribute of type Binary. For example:

"B": "dGhpcyB0ZXh0IGlzIGJhc2U2NC1lbmNvZGVk"

SS -> (list)

An attribute of type String Set. For example:

"SS": ["Giraffe", "Hippo" ,"Zebra"]

(string)

NS -> (list)

An attribute of type Number Set. For example:

"NS": ["42.2", "-19", "7.5", "3.14"]

Numbers are sent across the network to DynamoDB as strings, to maximize compatibility across languages and libraries. However, DynamoDB treats them as number type attributes for mathematical operations.

(string)

BS -> (list)

An attribute of type Binary Set. For example:

"BS": ["U3Vubnk=", "UmFpbnk=", "U25vd3k="]

(blob)

M -> (map)

An attribute of type Map. For example:

"M": {"Name": {"S": "Joe"}, "Age": {"N": "35"}}

key -> (string)

value -> (structure)

Represents the data for an attribute.

Each attribute value is described as a name-value pair. The name is the data type, and the value is the data itself.

For more information, see Data Types in the Amazon DynamoDB Developer Guide .

S -> (string)

An attribute of type String. For example:

"S": "Hello"

N -> (string)

An attribute of type Number. For example:

"N": "123.45"

Numbers are sent across the network to DynamoDB as strings, to maximize compatibility across languages and libraries. However, DynamoDB treats them as number type attributes for mathematical operations.

B -> (blob)

An attribute of type Binary. For example:

"B": "dGhpcyB0ZXh0IGlzIGJhc2U2NC1lbmNvZGVk"

SS -> (list)

An attribute of type String Set. For example:

"SS": ["Giraffe", "Hippo" ,"Zebra"]

(string)

NS -> (list)

An attribute of type Number Set. For example:

"NS": ["42.2", "-19", "7.5", "3.14"]

Numbers are sent across the network to DynamoDB as strings, to maximize compatibility across languages and libraries. However, DynamoDB treats them as number type attributes for mathematical operations.

(string)

BS -> (list)

An attribute of type Binary Set. For example:

"BS": ["U3Vubnk=", "UmFpbnk=", "U25vd3k="]

(blob)

M -> (map)

An attribute of type Map. For example:

"M": {"Name": {"S": "Joe"}, "Age": {"N": "35"}}

key -> (string)

( … recursive … )

L -> (list)

An attribute of type List. For example:

"L": [ {"S": "Cookies"} , {"S": "Coffee"}, {"N": "3.14159"}]

( … recursive … )

NULL -> (boolean)

An attribute of type Null. For example:

"NULL": true

BOOL -> (boolean)

An attribute of type Boolean. For example:

"BOOL": true

L -> (list)

An attribute of type List. For example:

"L": [ {"S": "Cookies"} , {"S": "Coffee"}, {"N": "3.14159"}]

(structure)

Represents the data for an attribute.

Each attribute value is described as a name-value pair. The name is the data type, and the value is the data itself.

For more information, see Data Types in the Amazon DynamoDB Developer Guide .

S -> (string)

An attribute of type String. For example:

"S": "Hello"

N -> (string)

An attribute of type Number. For example:

"N": "123.45"

Numbers are sent across the network to DynamoDB as strings, to maximize compatibility across languages and libraries. However, DynamoDB treats them as number type attributes for mathematical operations.

B -> (blob)

An attribute of type Binary. For example:

"B": "dGhpcyB0ZXh0IGlzIGJhc2U2NC1lbmNvZGVk"

SS -> (list)

An attribute of type String Set. For example:

"SS": ["Giraffe", "Hippo" ,"Zebra"]

(string)

NS -> (list)

An attribute of type Number Set. For example:

"NS": ["42.2", "-19", "7.5", "3.14"]

Numbers are sent across the network to DynamoDB as strings, to maximize compatibility across languages and libraries. However, DynamoDB treats them as number type attributes for mathematical operations.

(string)

BS -> (list)

An attribute of type Binary Set. For example:

"BS": ["U3Vubnk=", "UmFpbnk=", "U25vd3k="]

(blob)

M -> (map)

An attribute of type Map. For example:

"M": {"Name": {"S": "Joe"}, "Age": {"N": "35"}}

key -> (string)

( … recursive … )

L -> (list)

An attribute of type List. For example:

"L": [ {"S": "Cookies"} , {"S": "Coffee"}, {"N": "3.14159"}]

( … recursive … )

NULL -> (boolean)

An attribute of type Null. For example:

"NULL": true

BOOL -> (boolean)

An attribute of type Boolean. For example:

"BOOL": true

NULL -> (boolean)

An attribute of type Null. For example:

"NULL": true

BOOL -> (boolean)

An attribute of type Boolean. For example:

"BOOL": true