Question

SQL select and update multiple rows

Asked by: LeadCo

Help me understand loop process using SQL 2005. Here is a sample project I do in CF8. I want to run this script soley on SQL2005.

This process is pretty simple in coldfusion. I have  2 tables a client table and a log table. I want to loop through all recs in log_table and update client table (tabl1) where tabl1.id=log_tabl.id

I am going to post this code in coldfusion and I would like to know how to do this with TSQL. or as a SP.
I want to be able to make this a stored procedure and set as a job to run every few minutes in SQL2005.
Any Help appreciated.

<cfquery datasource="#d#" name="clients">
Select id
from tabl1 
where active=1
</cfquery>
 
<cfloop query="clients">
<cfquery datasource="#d#" name= "countem">
Select  count(log_id) as mtd from log_table 
where Cid = #id#
</cfquery>
 
 
<cfquery datasource="#d#">
Update tbl1set Xcount=#countem.mtd#
where id = #id#
</cfquery>
 
 
</cfloop>

                                  
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Asked On
2009-10-04 at 17:59:21ID24784267
Tags

SQL 2005

Topics

MS SQL Server

,

MS SQL DTS

,

SQL Query Syntax

Participating Experts
2
Points
500
Comments
6

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Answers

 

by: rrjegan17Posted on 2009-10-04 at 18:09:16ID: 25491769

You can perform the Looping, SELECT and UPDATE everything in a single UPDATE query given below

UPDATE tbl1
set Xcount = t2.log_cnt 
From tb1 t1, (SELECT Cid, count(log_id) log_cnt 
from log_table
group by Cid) t2
where t1.id = t2.Cid

                                              
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by: LeadCoPosted on 2009-10-04 at 18:58:36ID: 25492058

Thats fantastik! Works for this sample, however my main purpose of the post was to figure out how to perform a loop with SQL, I know thats the long way around on this sample but my scripts usually require multiple queries - update- variables etc..
Is there a way to process the code in  SQL to perform like I use it in CF shown in the sample, where you do a loop and use the variables from the loop in queries that follow?

 

by: MelissaSuciadiPosted on 2009-10-04 at 19:32:50ID: 25492154

Looping IN SQL

http://msdn.microsoft.com/en-us/library/aa172595%28SQL.80%29.aspx

However It not Really Recommended cause if you has 1000 rows then it'll loop 1000 times

/* Use DECLARE @local_variable, DECLARE CURSOR and SET. */
DECLARE @ID int
DECLARE @LName Varchar(30)
 
DECLARE MyCursor CURSOR FOR
SELECT ID, LastName FROM Northwind.dbo.Employees
 
OPEN MyCursor 
FETCH NEXT FROM MyCursor  INTO @Id, @LName
 
WHILE @@FETCH_STATUS = 0 
BEGIN
 
Update History Employee
SET LastName = @LName
WHERE ID = @ID
 
FETCH NEXT FROM MyCursor  INTO @Id, @LName
END
 
CLOSE MyCursor  
DEALLOCATE MyCursor  
                                              
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by: rrjegan17Posted on 2009-10-04 at 22:39:51ID: 25492626

>> however my main purpose of the post was to figure out how to perform a loop with SQL

Then comment by MelissaSuciadi should help.
But I would not recommend cursor approach as SQL Server architecture will not handle cursors or loops efficiently.

MelissaSuciadi also mentioned about this..

>> Is there a way to process the code in  SQL to perform like I use it in CF shown in the sample, where you do a loop and use the variables from the loop in queries that follow?

Yes.. You can but it wont be an optimal approach.
However we can convert that kind of looping code into a single statement as I gave you earlier for better performance.

Try to write it in a generic approach as I provided earlier for better performance.
If you are not sure whether it can be converted to generic approach as above, Kindly share the logic so that we can help you out..

 

by: LeadCoPosted on 2009-10-07 at 22:13:43ID: 31637010

Thanks!

 

by: rrjegan17Posted on 2009-10-08 at 07:31:08ID: 25525844

Welcome..

20120131-EE-VQP-002

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