How to check if a stored procedure exists before c

Question

I have a SQL script that has to be run every time a client executes the "database management" functionality. The script includes creating stored procedures on the client database. Some of these clients might already have the stored procedure upon running the script, and some may not. I need to have the missing stored procedures added to the client database, but it doesn't matter how much I try to bend T-SQL syntax, I get

CREATE/ALTER PROCEDURE' must be the first statement in a query batch

I've read that dropping before creating works, but I don't like doing it that way.

IF EXISTS (SELECT * FROM sys.objects WHERE type = 'P' AND name = 'MyProc')
DROP PROCEDURE MyProc
GO

CREATE PROCEDURE MyProc
...

How can I add check for the existence of a stored procedure and create it if it doesn't exist but alter it if it does exist?

Answer 1

CREATE Procedure IF NOT EXISTS 'Your proc-name' () BEGIN ... END

Answer 2

**The simplest way to drop and recreate a stored proc in T-Sql is **

Use DatabaseName
go
If Object_Id('schema.storedprocname') is not null
begin
   drop procedure schema.storedprocname
end
go

create procedure schema.storedprocname
as

begin
end

Answer 3

Here is the script that I use. With it, I avoid unnecessarily dropping and recreating the stored procs.

IF NOT EXISTS (
    SELECT *
    FROM sys.objects
    WHERE object_id = OBJECT_ID(N'[dbo].[uspMyProcedure]')
    )
BEGIN
  EXEC sp_executesql N'CREATE PROCEDURE [dbo].[uspMyProcedure] AS select 1'
END
GO

ALTER PROCEDURE [dbo].[uspMyProcedure] 
    @variable1 INTEGER  
AS
BEGIN
   -- Stored procedure logic
END

Answer 4

As of SQL SERVER 2016 you can use the new DROP PROCEDURE IF EXISTS.
DROP { PROC | PROCEDURE } [ IF EXISTS ] { [ schema_name. ] procedure } [ ,...n ]

Reference : https://msdn.microsoft.com/en-us/library/ms174969.aspx

Answer 5

In Sql server 2008 onwards, you can use "INFORMATION_SCHEMA.ROUTINES"

IF EXISTS (SELECT 1 FROM INFORMATION_SCHEMA.ROUTINES 
  WHERE ROUTINE_NAME = 'MySP'
        AND ROUTINE_TYPE = 'PROCEDURE') 

Answer 6

You can run procedural code anywhere you are able to run a query.

Just copy everything after AS:

BEGIN
    DECLARE @myvar INT
    SELECT  *
    FROM    mytable
    WHERE   @myvar ...
END

This code does exactly same things a stored proc would do, but is not stored on the database side.

That's much like what is called anonymous procedure in PL/SQL.

Update:

Your question title is a little bit confusing.

If you only need to create a procedure if it not exists, then your code is just fine.

Here's what SSMS outputs in the create script:

IF EXISTS ( SELECT  *
            FROM    sys.objects
            WHERE   object_id = OBJECT_ID(N'myproc')
                    AND type IN ( N'P', N'PC' ) ) 
DROP …
CREATE …

Update:

Example of how to do it when including the schema:

IF EXISTS ( SELECT * 
            FROM   sysobjects 
            WHERE  id = object_id(N'[dbo].[MyProc]') 
                   and OBJECTPROPERTY(id, N'IsProcedure') = 1 )
BEGIN
    DROP PROCEDURE [dbo].[MyProc]
END

In the example above, dbo is the schema.

Update:

In SQL Server 2016+, you can just do

CREATE OR ALTER PROCEDURE dbo.MyProc