Question

How do I abort from an sql script containing several batches of commands.

Asked by: RQuadling

Hi.

I've got a DB creation script which requires some setup depending upon the server the user is using.

The script has several batches of commands (create procedure and views, etc.) which have to exist as the first entry in the batch.

What I am sort of lost is how do I quit the entire script when the required conditions aren't met.

Below is are some simplified examples of what I've tried.

How do I abort the current script - not the batch, the entire script.

-- Example 1
DECLARE @i_MustNotBeNull int
 
-- You must uncomment the appropriate line
-- SELECT @i_MustNotBeNull = 1
-- SELECT @i_MustNotBeNull = 2
 
IF @i_MustNotBeNull IS NULL
	RETURN
 
PRINT 'Never reached if @i_MustNotBeNull IS NULL'
GO
 
PRINT 'Should never be reached if @i_MustNotBeNull IS NULL - assume this is a CREATE PROCEDURE line and MUST be the first line in the batch'
GO
 
/* Outputs
 
Should never be reached if @i_MustNotBeNull IS NULL - assume this is a CREATE PROCEDURE line and MUST be the first line in the batch
 
 
*/
 
 
 
 
 
 
 
 
-- Example 2
BEGIN TRANSACTION
 
DECLARE @i_MustNotBeNull int
 
-- You must uncomment the appropriate line
-- SELECT @i_MustNotBeNull = 1
-- SELECT @i_MustNotBeNull = 2
 
SELECT @i_MustNotBeNull
 
IF @i_MustNotBeNull IS NULL
	BEGIN
	ROLLBACK TRANSACTION
	RETURN
	END
 
PRINT 'Never reached'
GO
 
PRINT 'Should never be reached if @i_MustNotBeNull IS NULL - assume this is a CREATE PROCEDURE line and MUST be the first line in the batch'
GO
 
COMMIT TRANSACTION
 
/* Outputs
 
Should never be reached if @i_MustNotBeNull IS NULL - assume this is a CREATE PROCEDURE line and MUST be the first line in the batch
Msg 3902, Level 16, State 1, Line 2
The COMMIT TRANSACTION request has no corresponding BEGIN TRANSACTION.
 */
                                  
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Asked On
2009-10-21 at 01:16:15ID24829691
Tags

Microsoft SQL 2005

,

SQL

,

abort

Topics

SQL Server 2005

,

SQL Query Syntax

,

MS SQL Server

Participating Experts
2
Points
500
Comments
7

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Answers

 

by: mazherPosted on 2009-10-21 at 02:38:16ID: 25622162

I am sure this will help you out

IF @@TRANCOUNT = 0 
    BEGIN        
        BEGIN TRANSACTION
    END
GO
 
Your Statements (create Table , Create Views) Procedures Funtions .............................
 
GO
IF @@ERROR <> 0
    AND @@TRANCOUNT > 0 
    ROLLBACK TRANSACTION
go 
                                              
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by: dankangrPosted on 2009-10-21 at 03:02:27ID: 25622295

The GO statements that exists inside  your script are the ones that creates the problem.
each time you use the GO SQL thinks that its a new execution.
As a result to that if you run your second script you are getting an error that there is no transaction to commit.

If you remove the GO statements all works fine.

 

by: RQuadlingPosted on 2009-10-21 at 04:04:13ID: 25622611

Can't remove GO as the actual script is creating procedures, views, triggers, etc. which must be the first line in a batch.

 

by: dankangrPosted on 2009-10-21 at 05:29:32ID: 25623206

you can put the create of procedures etc as an input to sp_executesql

example

DECLARE @tmpSQL VARCHAR(MAX)
SET @tmpSQL ='CREATE TABLE TEST(ID INT IDENTITY(1,1), Field1 varchar(100))

EXEC sp_executesql @tmpSQL

with this approach there is no need for the GO keyword

 

by: mazherPosted on 2009-10-21 at 14:04:07ID: 25628416

if you want to write down script for updating database through script this method is tested place
IF @@TRANCOUNT = 0
    BEGIN        
        BEGIN TRANSACTION
    END
GO
 
before each statement you wana to execute on target machine and place

 
GO
IF @@ERROR <> 0
    AND @@TRANCOUNT > 0
    ROLLBACK TRANSACTION
go

After that statement . here what it does you want to execute to creat an table before that you started new transaction execute creat statment then error occurs or any condition you want to rollback it and execute furthor statements then you have to palce Go statement so that statement should not pause here. Rollback on error or some condition then do other work.

IF @@TRANCOUNT = 0 
    BEGIN        
        BEGIN TRANSACTION
    END
GO
 
CREATE TABLE TEST(ID INT IDENTITY(1,1), Field1 varchar(100))
 
 
GO
IF @@ERROR <> 0
    AND @@TRANCOUNT > 0 
    ROLLBACK TRANSACTION
go 

                                              
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by: RQuadlingPosted on 2009-10-22 at 00:28:01ID: 25631534

Mazher. I completely miss read your first comment. Sorry.

I'll try the trancount method later today.

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