How to Ensure Stored Procedure Existence and Correct Configuration Across Multiple Databases?

Ensuring the Existence and Configuration of Stored Procedures

When executing database management scripts across multiple client databases, it's crucial to ensure that necessary stored procedures exist on each client's database. However, attempting to create a stored procedure in an existing database can result in the following error:

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

This error arises when the CREATE PROCEDURE or ALTER PROCEDURE statement is not the initial statement executed in a query batch. To address this, some users recommend conditionally dropping the stored procedure before creating it, as shown below:

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

CREATE PROCEDURE MyProc
...

However, this approach may not be ideal in certain scenarios. An alternative solution is to utilize the combination of IF NOT EXISTS and OBJECT_ID functions to check for the existence of a stored procedure and take appropriate actions. This allows you to create the stored procedure if it doesn't exist and alter it if it does exist. The updated code would appear as follows:

IF NOT EXISTS (SELECT * FROM sys.objects WHERE type = 'P' AND OBJECT_ID = OBJECT_ID('dbo.MyProc'))
   exec('CREATE PROCEDURE [dbo].[MyProc] AS BEGIN SET NOCOUNT ON; END')
GO

ALTER PROCEDURE [dbo].[MyProc] 
AS
  ....

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