Question

Drop table in stored procedure

Asked by: maxy88

I need to drop a table inside a stored procedure in Sybase and then re-create the table, populate it and then build indexes on it. This table needs to be present after the stored procedure finishes. I have the test code below which runs fine during the first pass, but the second time it is invoked I get the following error:

There is already an object named 'myTable' in the database.

It seems that the table is not dropped when the procedure is invoked. I'm quite new to databases field and would appreciate any help on getting this to work. Thanks.

if object_id('mySP') is not null
begin
    drop procedure mySP
end
go
 
create proc mySP
as
begin
	if exists (select 1 from sysobjects where name='myTable' and type='U')
	begin
		drop table myTable
	end
 
	create table myTable
	(
		a int   null
	)
end
go
 
execute mySP
go

                                  
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Asked On
2009-09-03 at 04:41:21ID24704211
Tags

Sybase

,

stored procedure

Topic

Sybase Database

Participating Experts
2
Points
50
Comments
5

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Answers

 

by: Jan_FranekPosted on 2009-09-03 at 06:24:58ID: 25250383

Yes, this is how it works, but I'm not quite sure why. Probably compiler checks for existency of used object before running the procedure.

Try to put your create table statement into separate procedure a call this new procedure from your mySP. This should work around your problem.

 

by: Jan_FranekPosted on 2009-09-03 at 06:26:42ID: 25250401

if object_id('mySPsub') is not null
begin
    drop procedure mySPsub
end
go
 
if object_id('mySP') is not null
begin
    drop procedure mySP
end
go
 
create proc mySPsub
as
begin
 
        create table myTable
        (
                a int   null
        )
end
go
 
create proc mySP
as
begin
        if exists (select 1 from sysobjects where name='myTable' and type='U')
        begin
                drop table myTable
        end
 
        execute mySPsub
end
go
 
execute mySP
go

                                              
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by: Jan_FranekPosted on 2009-09-03 at 06:28:00ID: 25250413

And you will probably have to use the same trick for create index

 

by: hkamalPosted on 2009-09-04 at 06:18:32ID: 25259319

Alternatively, you can put the create and drop in dynamic SQL; viz:
create proc myProc
as begin
  declare @sql varchar(1000)
select @sql = "if object_id('myTable') != null drop table myTable"
exec (@sql)
select @sql = "create table myTable (a int null, b char null, c flat null)"table myTable"
exec (@sql)
select @sql = "create index ix_a on myTable (a)"
exec (@sql)
end -- proc
go

 

by: maxy88Posted on 2009-09-08 at 06:14:59ID: 25281488

Jan, I tried your suggestion but still got some errors that either the table already existed or the stored procedures could not be created after executing the script a second time. hkamal's solution worked however. Thanks to both for the help.

20120131-EE-VQP-002

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