Important
This section refers to API version 2011-12-05, which is deprecated and should not be used for new applications.
For documentation on the current low-level API, see the Amazon DynamoDB API Reference.
Creates a new item, or replaces an old item with a new item (including all the attributes). If an item already exists in the specified table with the same primary key, the new item completely replaces the existing item. You can perform a conditional put (insert a new item if one with the specified primary key doesn't exist), or replace an existing item if it has certain attribute values.
Attribute values may not be null; string and binary type attributes must have lengths greater than zero; and set type attributes must not be empty. Requests with empty values will be rejected with a ValidationException
.
Note
To ensure that a new item does not replace an existing item, use a conditional put operation with Exists
set to false
for the primary key attribute, or attributes.
For more information about using PutItem
, see Working with items and attributes.
// This header is abbreviated.
// For a sample of a complete header, see DynamoDB low\-level API.
POST / HTTP/1.1
x-amz-target: DynamoDB_20111205.PutItem
content-type: application/x-amz-json-1.0
{"TableName":"Table1",
"Item":{
"AttributeName1":{"S":"AttributeValue1"},
"AttributeName2":{"N":"AttributeValue2"},
"AttributeName5":{"B":"dmFsdWU="}
},
"Expected":{"AttributeName3":{"Value": {"S":"AttributeValue"}, "Exists":Boolean}},
"ReturnValues":"ReturnValuesConstant"}
Name | Description | Required |
---|---|---|
TableName | The name of the table to contain the item. Type: String | Yes |
Item | A map of the attributes for the item, and must include the primary key values that define the item. Other attribute name-value pairs can be provided for the item. For more information about primary keys, see Primary key.Type: Map of attribute names to attribute values. | Yes |
Expected | Designates an attribute for a conditional put. The Expected parameter allows you to provide an attribute name, and whether or not DynamoDB should check to see if the attribute value already exists; or if the attribute value exists and has a particular value before changing it.Type: Map of an attribute names to an attribute value, and whether it exists. |
No |
Expected:AttributeName | The name of the attribute for the conditional put.Type: String | No |
Expected:AttributeName: ExpectedAttributeValue | Use this parameter to specify whether or not a value already exists for the attribute name-value pair. The following JSON notation replaces the item if the "Color" attribute doesn't already exist for that item:"Expected" :The following JSON notation checks to see if the attribute with name "Color" has an existing value of "Yellow" before replacing the item: "Expected" :By default, if you use the Expected parameter and provide a Value , DynamoDB assumes the attribute exists and has a current value to be replaced. So you don't have to specify {"Exists":true} , because it is implied. You can shorten the request to:"Expected" :If you specify {"Exists":true} without an attribute value to check, DynamoDB returns an error. |
No |
ReturnValues | Use this parameter if you want to get the attribute name-value pairs before they were updated with the PutItem request. Possible parameter values are NONE (default) or ALL_OLD . If ALL_OLD is specified, and PutItem overwrote an attribute name-value pair, the content of the old item is returned. If this parameter is not provided or is NONE , nothing is returned.Type: String |
No |
The following syntax example assumes the request specified a ReturnValues
parameter of ALL_OLD
; otherwise, the response has only the ConsumedCapacityUnits
element.
HTTP/1.1 200
x-amzn-RequestId: 8966d095-71e9-11e0-a498-71d736f27375
content-type: application/x-amz-json-1.0
content-length: 85
{"Attributes":
{"AttributeName3":{"S":"AttributeValue3"},
"AttributeName2":{"SS":"AttributeValue2"},
"AttributeName1":{"SS":"AttributeValue1"},
},
"ConsumedCapacityUnits":1
}
Name | Description |
---|---|
Attributes | Attribute values before the put operation, but only if the ReturnValues parameter is specified as ALL_OLD in the request.Type: Map of attribute name-value pairs. |
ConsumedCapacityUnits | The number of write capacity units consumed by the operation. This value shows the number applied toward your provisioned throughput. For more information see Managing settings on DynamoDB provisioned capacity tables. Type: Number |
Error | Description |
---|---|
ConditionalCheckFailedException | Conditional check failed. An expected attribute value was not found. |
ResourceNotFoundException | The specified item or attribute was not found. |
For examples using the AWS SDK, see Working with items and attributes.
// This header is abbreviated. For a sample of a complete header, see DynamoDB low\-level API.
POST / HTTP/1.1
x-amz-target: DynamoDB_20111205.PutItem
content-type: application/x-amz-json-1.0
{"TableName":"comp5",
"Item":
{"time":{"N":"300"},
"feeling":{"S":"not surprised"},
"user":{"S":"Riley"}
},
"Expected":
{"feeling":{"Value":{"S":"surprised"},"Exists":true}}
"ReturnValues":"ALL_OLD"
}
HTTP/1.1 200
x-amzn-RequestId: 8952fa74-71e9-11e0-a498-71d736f27375
content-type: application/x-amz-json-1.0
content-length: 84
{"Attributes":
{"feeling":{"S":"surprised"},
"time":{"N":"300"},
"user":{"S":"Riley"}},
"ConsumedCapacityUnits":1
}