Looping Database Queries

Jul 20, 2005

Hi, newbie here:

I have created a small (5 fields) Access table which I will be
converting to MS-SQL Server format when the ASP code has been
completed. It is basically a collection of links to news releases from
mining companies. The group of people who will be browsing this
database want to know if the news release pertains to their area.
Sometimes the news release pertains to multiple areas if the mining
properties are scattered. Given the possibility of a one-to-many
relationship, ie one news release, many areas, I created an additional
table for the areas. I created the ASP code to pull down the news
release information, then loop through the area records such as:

set RSNewsRelease = Server.CreateObject("ADODB.Recordset")
NewsRelSQL = "Select date, company, title, newsreleaseID from
newsreleases;"

do while not RSNewsRelease.EOF
'display news release date, company and title
response.write RSNewsRelease(0).Value & RSNewsRelease(1).Value &
RSNewsRelease(2).Value

'loop through areas
set RSAreas = Server.CreateObject("ADODB.Recordset")
'run query
do while not RSAreas.EOF
'display areas
Loop
set RSAreas = nothing
Loop

In other words, the only way I could get the results I wanted was to
set the Recordset to nothing, then reset it with each iteration of the
outer loop.

Is there a better way to do this?

Jules

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I know this question has been asked. And the usual answer is don't usecursors or any other looping method. Instead, try to find a solutionthat uses set-based queries.But this brings up several questions / senarios:* I created several stored procedures that take parameters and insertsthe data into the appropriate tables. This was done for easy access/usefrom client side apps (i.e. web-based).Proper development tactics says to try and do "code reuse". So, if Ialready have stored procs that do my logic, should I be writing asecond way of handling the data? If I ever need to change the way thedata is handled, I now have to make the same change in two (or more)places.* Different data from the same row needs to be inserted into multipletables. "Common sense" (maybe "gut instinct" is better) says to handleeach row as a "unit". Seems weird to process the entire set for onetable, then to process the entire set AGAIN for another table, and thenYET AGAIN for a third table, and so on.* Exception handling. Set based processing means that if one row failsthe entire set fails. Looping through allows you to fail a row butallow everything else to be processed properly. It also allows you togather statistics. (How many failed, how many worked, how many wereskipped, etc.)?? Good idea ?? The alternative is to create a temporary table (sandboxor workspace type thing), copy the data to there along with "status" or"valdation" columns, run through the set many times over looking forany rows that may fail, marking them as such, and then at the end onlydealing with those rows which "passed" the testing. Of course, in orderfor this to work you must know (and duplicate) all constraints so youknow what to look for in your testing.

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TABLES
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Hi,

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Connection Broken

select @@version returns, Microsoft SQL Server 7.00 - 7.00.961 (Intel X86) Oct 24 2000 18:39:12 Copyright (c) 1988-1998 Microsoft Corporation Standard Edition on Windows NT 5.0 (Build 2195: Service Pack 2)

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or so?

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Hi,

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2006-06-06 11:43:32.59 spid54 SqlDumpExceptionHandler: Process 54 generated fatal exception c0000005 EXCEPTION_ACCESS_VIOLATION. SQL Server is terminating this process.
2006-06-06 11:43:32.59 spid54 * *******************************************************************************
2006-06-06 11:43:32.59 spid54 *
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2006-06-06 11:43:32.59 spid54 * 06/06/06 11:43:32 spid 54
2006-06-06 11:43:32.59 spid54 *
2006-06-06 11:43:32.59 spid54 *
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2006-06-06 11:43:32.59 spid54 * Exception Code = c0000005 EXCEPTION_ACCESS_VIOLATION
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2006-06-06 11:43:32.59 spid54 * Input Buffer 260 bytes -
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2006-06-06 11:43:32.59 spid54 *
2006-06-06 11:43:32.59 spid54 *
2006-06-06 11:43:32.59 spid54 * MODULE BASE END SIZE
2006-06-06 11:43:32.59 spid54 * sqlservr 01000000 02BA7FFF 01ba8000
2006-06-06 11:43:32.59 spid54 * ntdll 7C800000 7C8BFFFF 000c0000
2006-06-06 11:43:32.59 spid54 * kernel32 77E40000 77F41FFF 00102000
2006-06-06 11:43:32.59 spid54 * MSVCR80 78130000 781CAFFF 0009b000
2006-06-06 11:43:32.59 spid54 * msvcrt 77BA0000 77BF9FFF 0005a000

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As Au Ma


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