Solved

Use SQL Variable in Database name

Posted on 2007-04-02
6
1,764 Views
Last Modified: 2008-01-09
I am trying to run the same query on a series of databases, but T-SQL would not let me use the variable name as the name of the database to query. Consider the following query:

DECLARE db_cursor CURSOR
FOR SELECT name FROM sys.databases WHERE LEFT(name,4) = 'SBO_' AND RIGHT(name,4) <> 'TEST'

-- declare the variables that will hold values retrieved by the cursor
DECLARE @db_id CHAR(10)
OPEN db_cursor

FETCH NEXT FROM db_cursor INTO @db_id

-- loop through the results
WHILE @@FETCH_STATUS = 0
BEGIN
      SELECT CompnyName FROM [@db_id]..[OADM]
      --SELECT @db_id (this works fine, the above does not)
      FETCH NEXT FROM db_cursor INTO @db_id
      
END

-- close and deallocate the cursor
CLOSE db_cursor
DEALLOCATE db_cursor

Anybody have any idea on how to solve this?

Thanks in advance,

Joerg.
0
Comment
Question by:jaldinger
  • 3
  • 3
6 Comments
 
LVL 142

Expert Comment

by:Guy Hengel [angelIII / a3]
ID: 18837967
unless you use dynamic sql, there is no way to make the database name a variable
0
 

Author Comment

by:jaldinger
ID: 18837986
Thank you. I have never heard of Dynamic SQL. So what would the script look like in Dynamic SQL that does what I'm looking for?
0
 
LVL 142

Expert Comment

by:Guy Hengel [angelIII / a3]
ID: 18838027
before we go into that issue, 2 questions:
* are you SURE that you need a cursor? ie, what is the code about?
* are you SURE that you need to put the dbname as variable? couldn't you connect to the correct database in the first place?
0
Zoho SalesIQ

Hassle-free live chat software re-imagined for business growth. 2 users, always free.

 

Author Comment

by:jaldinger
ID: 18838070
angellll:
What I need to do is execute the same SELECT statement against a varying number of databases on the server. I can do that from code by first getting the database names (SELECT FROM sys.databases) and then running the SELECT query once against each of them. I was looking for a way to get the complete result set with a single query to the server because bandwidth and latency in this application are an issue.
0
 
LVL 142

Accepted Solution

by:
Guy Hengel [angelIII / a3] earned 250 total points
ID: 18838392
the following might help:

exec sp_msforeachdb '
 SELECT CompnyName FROM ?..[OADM]
'

0
 

Author Comment

by:jaldinger
ID: 20328795
That hasn't completely solved my problem, but I consider it good enough. Thanks.
0

Featured Post

Control application downtime with dependency maps

Visualize the interdependencies between application components better with Applications Manager's automated application discovery and dependency mapping feature. Resolve performance issues faster by quickly isolating problematic components.

Join & Write a Comment

JSON is being used more and more, besides XML, and you surely wanted to parse the data out into SQL instead of doing it in some Javascript. The below function in SQL Server can do the job for you, returning a quick table with the parsed data.
Load balancing is the method of dividing the total amount of work performed by one computer between two or more computers. Its aim is to get more work done in the same amount of time, ensuring that all the users get served faster.
This video shows, step by step, how to configure Oracle Heterogeneous Services via the Generic Gateway Agent in order to make a connection from an Oracle session and access a remote SQL Server database table.
Via a live example combined with referencing Books Online, show some of the information that can be extracted from the Catalog Views in SQL Server.

760 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

19 Experts available now in Live!

Get 1:1 Help Now