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DeleteItem method

Written by
Updated at February 10, 2023

Deletes a table item by the specified primary key.

You can set a condition. An item will then be deleted only if the condition is met.

The method may return the attribute values as they were before the item was deleted.

Request

The request contains data in JSON format.

{
   "ConditionalOperator": "string",
   "ConditionExpression": "string",
   "Expected": {
      "string" : {
         "AttributeValueList": [
            {
               "B": blob,
               "BOOL": boolean,
               "BS": [ blob ],
               "L": [
                  "AttributeValue"
               ],
               "M": {
                  "string" : "AttributeValue"
               },
               "N": "string",
               "NS": [ "string" ],
               "NULL": boolean,
               "S": "string",
               "SS": [ "string" ]
            }
         ],
         "ComparisonOperator": "string",
         "Exists": boolean,
         "Value": {
            "B": blob,
            "BOOL": boolean,
            "BS": [ blob ],
            "L": [
               "AttributeValue"
            ],
            "M": {
               "string" : "AttributeValue"
            },
            "N": "string",
            "NS": [ "string" ],
            "NULL": boolean,
            "S": "string",
            "SS": [ "string" ]
         }
      }
   },
   "ExpressionAttributeNames": {
      "string" : "string"
   },
   "ExpressionAttributeValues": {
      "string" : {
         "B": blob,
         "BOOL": boolean,
         "BS": [ blob ],
         "L": [
            "AttributeValue"
         ],
         "M": {
            "string" : "AttributeValue"
         },
         "N": "string",
         "NS": [ "string" ],
         "NULL": boolean,
         "S": "string",
         "SS": [ "string" ]
      }
   },
   "Key": {
      "string" : {
         "B": blob,
         "BOOL": boolean,
         "BS": [ blob ],
         "L": [
            "AttributeValue"
         ],
         "M": {
            "string" : "AttributeValue"
         },
         "N": "string",
         "NS": [ "string" ],
         "NULL": boolean,
         "S": "string",
         "SS": [ "string" ]
      }
   },
   "ReturnConsumedCapacity": "string"
   "ReturnValues": "string",
   "TableName": "string"
}

Parameters

Parameter Description
Key An associative array of attribute names for AttributeValue objects, representing the primary key of the item to delete.
For a simple primary key, you only need to specify its value.
For a composite primary key, specify the value of a partition key and a sort key.

Type: String
Length: 1 - 65535 characters.
Required: Yes
TableName Name of the table to delete the item from.
May contain a path in the directory hierarchy like path/to/table

Type: String
Length: 3 - 255 characters
Pattern: [a-zA-Z0-9_.-]+
Required: Yes
ConditionExpression Condition for deleting the item. The entry is deleted only if the condition is met.
The condition consists of:
  • A function: attribute_exists | attribute_not_exists | attribute_type | contains | begins_with | size. Names are case-sensitive.
  • A comparison operator: = | <> | < | > | <= | >= | BETWEEN | IN
  • A logical operator: AND | OR | NOT

Type: String
Required: No
ExpressionAttributeNames Placeholder that can be used in an expression instead of an attribute name. The placeholder must start with the hash character #.
Possible use cases:
  • If you need to specify an attribute whose name conflicts with the word reserved.
  • As a variable if the attribute name is used several times in an expression.
  • To prevent incorrect interpretation of special characters in the attribute name.
For example, the name of the Percentile attribute is in conflict with a reserved word and cannot be explicitly used in an expression. To get around this problem, in the ExpressionAttributeNames parameter, specify the placeholder: {"#P":"Percentile"}. Then, instead of the real attribute name, use #P.

Type: String
Length: 1 - 65535 characters.
Required: No
ExpressionAttributeValues Placeholder that can be used in an expression instead of an attribute value, similar to ExpressionAttributeNames. The placeholder must start with a colon :.
For example, you need to check whether the value of the ProductStatus attribute was one of the following: Available | Backordered | Discontinued. To do this, first declare placeholders: { ":avail":{"S":"Available"}, ":back":{"S":"Backordered"}, ":disc":{"S":"Discontinued"} }. After that, you can use them in the expression: ProductStatus IN (:avail, :back, :disc)

Type: String of the AttributeValue type
Required: No
ReturnConsumedCapacity Indicates whether to return information about the consumed capacity.
  • TOTAL: Return.
  • NONE: Do not return.

Type: String
Possible values: TOTAL | NONE
Required: No
ReturnValues Use it if you need to get attributes of an item before and after its update.
Possible values:
  • ALL_OLD: Return the contents of the deleted item
  • NONE (default): Do not return the contents of the deleted item

Type: String
Required: No

Response

If successful, HTTP code 200 is returned.
The response is returned in JSON format.

{
   "Attributes": {
      "string" : {
         "B": blob,
         "BOOL": boolean,
         "BS": [ blob ],
         "L": [
            "AttributeValue"
         ],
         "M": {
            "string" : "AttributeValue"
         },
         "N": "string",
         "NS": [ "string" ],
         "NULL": boolean,
         "S": "string",
         "SS": [ "string" ]
      }
   },
   "ConsumedCapacity": {
      "CapacityUnits": number,
      "GlobalSecondaryIndexes": {
         "string" : {
            "CapacityUnits": number,
            "ReadCapacityUnits": number,
            "WriteCapacityUnits": number
         }
      },
      "LocalSecondaryIndexes": {
         "string" : {
            "CapacityUnits": number,
            "ReadCapacityUnits": number,
            "WriteCapacityUnits": number
         }
      },
      "ReadCapacityUnits": number,
      "Table": {
         "CapacityUnits": number,
         "ReadCapacityUnits": number,
         "WriteCapacityUnits": number
      },
      "TableName": "string",
      "WriteCapacityUnits": number
   }
}

Parameters

Parameter Description
Attributes An associative array of the AttributeValue type containing the item's representation before it was deleted.
Returned only if the request passed the ReturnValues parameter set to ALL_OLD.

Type: Associative array of the AttributeValue type
Length: 1 - 65535 characters.
ConsumedCapacity Capacity units consumed by a delete operation.
Returned only if the ReturnConsumedCapacity parameter set to TOTAL is specified in the request.

Type: Object of the ConsumedCapacity type.

Errors

Parameter Description
ConditionalCheckFailedException Failed to evaluate the condition specified in the operation.

HTTP status code: 400
InternalServerError An internal error occurred on the server side.

HTTP status code: 500
ItemCollectionSizeLimitExceededException Item collection size limit exceeded. This exception is only returned for tables with one or more local secondary indexes.

HTTP status code: 400
ProvisionedThroughputExceededException You're sending requests too often. Try to increase the interval between requests.
If their number is not too large, Managed Service for YDB tries to process them all.

HTTP status code: 400
RequestLimitExceeded The bandwidth exceeds the set quota.

HTTP status code: 400
ResourceNotFoundException The specified table doesn't exist.

HTTP status code: 400
TransactionConflictException The operation is rejected as a different transaction is in progress for the item.

HTTP status code: 400

There may be common errors as well. These are errors that are common to all methods.

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