Delete an attachment

Delete a single attachment by its sys_id. SysId is the attachment's id in the sys_attachment table. Provide the TableName (optional for clarity) and the attachment SysId.

Standard SQL query example

This is the base query accepted by the connector. To execute it in SQL Server, you have to pass it to the Data Gateway via a Linked Server. See how to accomplish this using the examples below.

-- Delete a single attachment by attachment sys_id
SELECT * FROM delete_attachment
WITH(
  TableName='problem', -- optional, used for context
  SysId='d871411783d6321032ddb9f6feaad339'
)

Using OPENQUERY in SQL Server

SELECT * FROM OPENQUERY([LS_TO_SERVICENOW_IN_GATEWAY], '-- Delete a single attachment by attachment sys_id
SELECT * FROM delete_attachment
WITH(
  TableName=''problem'', -- optional, used for context
  SysId=''d871411783d6321032ddb9f6feaad339''
)')

Using EXEC in SQL Server (handling larger SQL text)

The major drawback of OPENQUERY is its inability to incorporate variables within SQL statements. This often leads to the use of cumbersome dynamic SQL (with numerous ticks and escape characters).

Fortunately, starting with SQL 2005 and onwards, you can utilize the EXEC (your_sql) AT [LS_TO_SERVICENOW_IN_GATEWAY] syntax.

DECLARE @MyQuery NVARCHAR(MAX) = '-- Delete a single attachment by attachment sys_id
SELECT * FROM delete_attachment
WITH(
  TableName=''problem'', -- optional, used for context
  SysId=''d871411783d6321032ddb9f6feaad339''
)'
EXEC (@MyQuery) AT [LS_TO_SERVICENOW_IN_GATEWAY]