Solved

SQL Stored Procedure If Else

Posted on 2008-06-16
8
204 Views
Last Modified: 2010-04-21
Good Day
Experts:

What is the best way to condition on a Select query is a Stored Procedure to determine whether to process code or not?

Let's say I have --> Select EngineHP from Motor where EngineSize = '400'

I would want to process some code in the S/P is the query returned a record with a value for EngineHP.
If no value found/retrieved issue to User "EngineSize not found"

I have tried  a CURSOR but could not get that to work.  

What would be my best option here?

Thanks,
jimbo99999
0
Comment
Question by:Jimbo99999
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
8 Comments
 
LVL 143

Accepted Solution

by:
Guy Hengel [angelIII / a3] earned 500 total points
ID: 21793332
here we go:
CREATE PROCEDURE yourproc 
AS
BEGIN
  SET NOCOUNT ON
  DECLARE @EngineHP varchar(100) 
  SELECT @EngineHP = EngineHP from Motor where EngineSize = '400'
  IF ROWCOUNT = 0 -- no rows found
    SELECT 'EngineSize not found' result
  ELSE 
    SELECT .... whatever you need ...
   
END

Open in new window

0
 
LVL 60

Expert Comment

by:chapmandew
ID: 21793335
is this what you're asking?

IF EXIST(Select EngineHP from Motor where EngineSize = '400')
BEGIN
--processing here
END
0
 
LVL 60

Expert Comment

by:chapmandew
ID: 21793343
angelIII, what happens if your query returns more than one result when trying to assign a value to the @EngineHP variable?
0
Online Training Solution

Drastically shorten your training time with WalkMe's advanced online training solution that Guides your trainees to action. Forget about retraining and skyrocket knowledge retention rates.

 
LVL 18

Expert Comment

by:jcoehoorn
ID: 21793492
Before writing this as an if/else struct I would try to combine the two operations into one more complicated query.
0
 

Author Closing Comment

by:Jimbo99999
ID: 31467581
EngineSize is part of the key so this is what I am looking for.  I was missing the ROWCOUNT interogation and result  after 'Engine not found'.

Thanks for the help...jimbo99999
0
 
LVL 60

Expert Comment

by:chapmandew
ID: 21794195
IF there are any records returned from this:

SELECT @EngineHP = EngineHP from Motor where EngineSize = '400'

Then you will get an error.
0
 
LVL 143

Expert Comment

by:Guy Hengel [angelIII / a3]
ID: 21794262
>IF there are any records returned from this:
>SELECT @EngineHP = EngineHP from Motor where EngineSize = '400'
>Then you will get an error.

in ms sql server, if there are 0 or > 1 records, there will be NO error.
if there are 0 records, the value of @EngineHP will not change.
if there are > 1 records, the value will be any of the rows' values (usually, the "last" one returned)
0
 
LVL 60

Expert Comment

by:chapmandew
ID: 21794310
whoops...I was thinking assignment from a subquery....
0

Featured Post

Independent Software Vendors: We Want Your Opinion

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Introduction In my previous article (http://www.experts-exchange.com/Microsoft/Development/MS-SQL-Server/SSIS/A_9150-Loading-XML-Using-SSIS.html) I showed you how the XML Source component can be used to load XML files into a SQL Server database, us…
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.
Via a live example, show how to extract insert data into a SQL Server database table using the Import/Export option and Bulk Insert.
Via a live example, show how to backup a database, simulate a failure backup the tail of the database transaction log and perform the restore.

739 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