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Executing a stored procedure while in a cursor loop

Posted on 2010-08-20
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Last Modified: 2012-05-10
I created a cursor to store script so that I could loop through all of the databases and list all of their tables. The looping script creation worked but I hit the 8,000 character limit barrier in SqlServer.

So rather than accumulate the entire script, I decided to execute a portion of the script while it was being generated. It did not work

Yet when I copy and paste the generated script and run it in a query panel, it works like a charm.

Attached is the code
CREATE TABLE #TableStructures(
	  [ApplicationCode] [varchar](50) NULL,
	  [RootFile] [varchar](255) NULL,
	  [DestinationTable] [varchar](255) NULL,
	  [Column Name] [varchar](128) NULL    
    )
    
    DECLARE @DBName VARCHAR(50)
    DECLARE @STRSQL VARCHAR(8000) 
    SET @strSQL =''
    DECLARE curDBName CURSOR  FOR SELECT name FROM sys.databases WHERE name NOT IN('CommonPrograms','ExtractorControl','master','model','msdb','tempdb')

    OPEN curDBName
    FETCH NEXT FROM curDBName INTO @DBName
    WHILE @@FETCH_STATUS=0
      BEGIN
	      SET @strSQL = @strSQL + 
        'INSERT INTO #TableStructures (ApplicationCode, RootFile, DestinationTable, [Column Name])
         SELECT ExtractorControl..FilesToProcess.ApplicationCode, ExtractorControl..FilesToProcess.RootFile, ExtractorControl..FilesToProcess.DestinationTable, '+ @DBName +'..syscolumns.name AS ''Column Name'' 
         FROM (ExtractorControl..FilesToProcess INNER JOIN '+ @DBName +'..sysobjects ON ExtractorControl..FilesToProcess.DestinationTable = '+ @DBName +'..sysobjects.name) INNER JOIN '+ @DBName +'..syscolumns ON '+ @DBName +'..sysobjects.id = '+ @DBName +'..syscolumns.id
         GROUP BY ExtractorControl..FilesToProcess.ApplicationCode, ExtractorControl..FilesToProcess.RootFile, ExtractorControl..FilesToProcess.DestinationTable, '+ @DBName +'..syscolumns.name, '+ @DBName +'..sysobjects.xtype
         HAVING ('+ @DBName +'..sysobjects.xtype)= ''U''' + CHAR(10)
        EXEC @STRSQL  
        PRINT @STRSQL    
        SET @strSQL =''    
        FETCH curDBName INTO @DBName
      END

    CLOSE curDBName
    DEALLOCATE curDBName   
    
    SELECT * FROM #TableStructures
    DROP TABLE #TableStructures

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Question by:LennyGray
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7 Comments
 
LVL 143

Expert Comment

by:Guy Hengel [angelIII / a3]
ID: 33488669
EXEC @STRSQL  must be:EXEC (@STRSQL)
0
 
LVL 12

Accepted Solution

by:
mcv22 earned 250 total points
ID: 33488696
Why not try something like this:


EXEC sp_msforeachdb
'
	USE [?]
	IF (''?'' NOT IN (''CommonPrograms'',''ExtractorControl'',''master'',''model'',''msdb'',''tempdb'')
	BEGIN
		INSERT #TableStructures (..)
		SELECT ...
	END
'

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LVL 69

Assisted Solution

by:Scott Pletcher
Scott Pletcher earned 250 total points
ID: 33488817
More specifically (and hopefully more helpfully :-) ):

EXEC sp_MSforeachdb '
IF ''?'' IN (''CommonPrograms'',''ExtractorControl'',''master'',''model'',''msdb'',''tempdb'')
    RETURN
INSERT INTO #TableStructures (ApplicationCode, RootFile, DestinationTable, [Column Name])
SELECT ftp.ApplicationCode, ftp.RootFile, ftp.DestinationTable, sc.name AS ''Column Name''
FROM ExtractorControl..FilesToProcess ftp
INNER JOIN [?]..sysobjects so ON ftp.DestinationTable = so.name
INNER JOIN [?]..syscolumns sc ON so.id = sc.id
WHERE so.xtype = ''U''
GROUP BY ftp.ApplicationCode, ftp.RootFile, ftp.DestinationTable, sc.name
ORDER BY ftp.ApplicationCode, ftp.RootFile, ftp.DestinationTable, sc.name
'

Table aliases -- such as ftp, sc and so -- make code much easier to write, read and maintain.
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LVL 10

Author Closing Comment

by:LennyGray
ID: 33500381
Masterful solution, Scott!

Thanks!
0
 
LVL 10

Author Comment

by:LennyGray
ID: 33500512
MCV22 - I apologize for awarding you the points in error.

ScottPletcher - I also apologize to you.

I have contacted EE for assistance in order to correct this error. You both are valuable assets to EE and to me. Thank you for the unselfish sharing of your time and experience.

It is a pleasure to know that the world has people like you and that you are generous-enough to share with people like me.

You are making a difference!

Lenny Gray
0
 
LVL 10

Author Closing Comment

by:LennyGray
ID: 33500627
The two of you created an elegant solution. Thanks, again!
0

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