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Archive for September, 2007

How to write a CURSOR loop over multiple databases in MSSQL 2000

September 27th, 2007 Rahmansaher No comments

I sure lot of people might want to use the script where they would want to loop over multiple databases sitting on a Single server. In my case, I had to check for  a Login Record  in all the databases since the person left the company and we wanted to disable his/her access. SO I wrote simple CURSOR script in MSSQL 2000. Hope this help to someone.  

PLAIN TEXT
SQL:
  1. USE master
  2.  
  3. DECLARE db_names CURSOR FOR
  4. SELECT name FROM sysdatabases
  5. -- Where Clause, Enable if you want to filter out some databases.
  6. --where name like 'databaseIwantName_%' and name not like 'databaseIdontwantName'
  7.  
  8. DECLARE @db_name varchar(100)
  9. DECLARE @QueryString NVARCHAR(500)
  10. DECLARE @UpdateString NVARCHAR(500)
  11.  
  12. OPEN db_names
  13. FETCH NEXT FROM db_names INTO
  14. @db_name
  15. WHILE @@FETCH_STATUS = 0
  16. BEGIN
  17. --PRINT @db_nam
  18. --In My case I used tbl_logins to do multiple select .
  19. SET @QueryString = 'Select * from ' + @db_name + '..logins where login like ''%loginname%'' '
  20. EXEC sp_executesql @QueryString
  21.  
  22. IF @@RowCount> 0
  23. BEGIN
  24. -- This gives the database name if there are any record found with the select state ran above
  25. PRINT @db_name
  26. END
  27.  
  28. --Similarly you can also have any Insert/Update Query IN a Loop.See example below
  29. --In My case I used tbl_logins to do multiple Update At Once.
  30. --SET @UpdateString = 'update ' + @db_name + '..tbllogins set password = ''account_blocked_out'', security_level = 0, approved = 0 where login like ''%loginname%'''
  31. --PRINT @UpdateString
  32. --EXEC sp_executesql @UpdateString
  33.  
  34. FETCH NEXT FROM db_names INTO
  35. @db_name
  36. END
  37.  
  38. CLOSE db_names
  39. DEALLOCATE db_names

 This is something written quick. Here is the Code for your Download. I am sure you can tune it better and if you do, please let me know . I would love to see your Ideas.

 Thanks

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Troubleshooting Random null null Error in Coldfusion MX

September 14th, 2007 Rahmansaher 1 comment

I have been looking so much for this error in Coldfusion MX  but could not find any solution to my problem. null null is a very vague exception error which gets thrown once in a while. Below are the steps I did to troubleshoot and one of them did the solved the problem.

 1) Apply this hot fix from Adobe.

2) Increase the JVM Heap Size. (I increased it  from 512 to 800)

3) Make sure your SELECT query does not pass any corrupt data. It might also be the very cause to  throw the exception error.Turning off query caching signifigantly increased the number of errors, so it seems to be something in the JDBC drivers.

4) Check to see if you have methods that accept parameters passed by reference(like getimagesize()) . Make sure you use right script language for example getimagesize uses VBSCRIPT not JSCRIPT. ( For me this was the case. I removed this method and it stopped the error completely).

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