Drop Object Procedure
I've recently started writing my own scripts to create a database instead of using EM.
I quickly tired of copying and pasting the typical if exists then drop statements, so I created this procedure to save me some time.
I know it doesn't take into account all of the possible data types, and I know
that I'm not suppossed to query sysobjects directly, but it gets the job done for me.
If you'd like to refactor it, please do.
/**********************************************************************
procDropConstraint
- This procedure simplifies dropping a constraint from the database.
sysDropObject 'FK_NodeAudit_Node'
Examples:
EXEC sysDropObject 'FK_Node_Document'
EXEC sysDropObject 'Document'
EXEC sysDropObject 'Node'
**********************************************************************/
--
CREATE PROCEDURE sysDropObject
@Name varchar(100)
AS
DECLARE
@xtype nvarchar(2),
@parentxtype nvarchar(2),
@parentname nvarchar(100),
@sql nvarchar(200)
SELECT
@xtype = child.xtype, @parentxtype = parent.xtype, @parentname = parent.name
FROM
dbo.sysobjects child
left outer join dbo.sysobjects parent on child.parent_obj = parent.id
WHERE
child.name = @Name
AND child.xtype NOT IN ('S','D') --system tables and extended properties
AND NOT (child.xtype = 'P' and LEFT(child.name, 3) = 'dt_') --local system proc
AND NOT (child.xtype = 'V' and LEFT(child.name, 3) = 'sys') --local system views
IF @xtype is null GOTO _NothingToDoHere
IF @xtype IN ('F','PK','UQ')
BEGIN
SET @sql = N'ALTER TABLE [' + @parentname + '] DROP CONSTRAINT [' + @Name + ']'
GOTO _ExecSql
END
IF @xtype = 'P'
BEGIN
SET @sql = N'DROP PROCEDURE [' + @Name + ']'
GOTO _ExecSql
END
IF @xtype = 'U'
BEGIN
SET @sql = N'DROP TABLE [' + @Name + ']'
GOTO _ExecSql
END
_Fail:
RAISERROR( 'Unhandled xtype ''%s'' for %s', 16, 1, @xtype, @Name )
RETURN 1
_ExecSql:
EXEC sp_executesql @sql
PRINT 'sysDropObject: executed - ' + @sql
RETURN 0
_NothingToDoHere:
PRINT 'sysDropObject: attempted to drop ' + @Name + ', but it does not exist to be dropped.'
RETURN 0
GO
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