Solved

How would you modify a Stored Procedure from executing if a table does not exist ?

Posted on 2008-10-09
3
150 Views
Last Modified: 2013-12-05
I am developing an Access ADP application using Access as the front end and SQL Server as the back end database. I execute a Stored Procedure in the Attach Code Snippet that has 3 parts.

Is there a way to execute Part A and if the table in Part A doesn't exist, exit the Stored Procedure ?
If the table in Part A exists, then execute Parts B and C.
Part A)
SELECT       *
FROM         ztblRefresh
 
Part B) 
DELETE FROM ztblCustomers
 
Part C)
INSERT INTO ztblCustomers
SELECT      ztblCustomersNew.*
FROM        ztblCustomersNew

Open in new window

0
Comment
Question by:zimmer9
[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
  • 2
3 Comments
 
LVL 39

Assisted Solution

by:BrandonGalderisi
BrandonGalderisi earned 200 total points
ID: 22681651
The code section below MAY work.  I don't know of it will parse the entire procedure at runtime though in which case it wouldn't work.  You would need to do something like this if not



if not exists (select 1 from information_schema.tables where table_name = 'ztblRefresh')
   return

exec up_DoStuff
go


WHERE up_DoStuff is

create procedure up_DoStuff as
Part A)
SELECT       *
FROM         ztblRefresh
 
Part B)
DELETE FROM ztblCustomers
 
Part C)
INSERT INTO ztblCustomers
SELECT      ztblCustomersNew.*
FROM        ztblCustomersNew

if not exists (select 1 from information_schema.tables where table_name = 'ztblRefresh')
   return
 
Part A)
SELECT       *
FROM         ztblRefresh
 
Part B) 
DELETE FROM ztblCustomers
 
Part C)
INSERT INTO ztblCustomers
SELECT      ztblCustomersNew.*
FROM        ztblCustomersNew

Open in new window

0
 
LVL 10

Expert Comment

by:dwe761
ID: 22682065
What does Part A actually do?  Does it create ztblRefresh?  Otherwise, it sounds like if ztblRefresh exists, you want to execute Parts B and C.  Is that correct?
If so, it'd look something like this:
 

IF NOT EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[ztblRefresh]') AND type in (N'U'))
BEGIN
 
   Part B) 
   DELETE FROM ztblCustomers
 
   Part C)
   INSERT INTO ztblCustomers
   SELECT      ztblCustomersNew.*
   FROM        ztblCustomersNew
 
 
END

Open in new window

0
 
LVL 10

Accepted Solution

by:
dwe761 earned 300 total points
ID: 22682082
Oops.  Change that to:
IF EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[ztblRefresh]') AND type in (N'U'))
...
 
0

Featured Post

Guide to Performance: Optimization & Monitoring

Nowadays, monitoring is a mixture of tools, systems, and codes—making it a very complex process. And with this complexity, comes variables for failure. Get DZone’s new Guide to Performance to learn how to proactively find these variables and solve them before a disruption occurs.

Question has a verified solution.

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

A simple tool to export all objects of two Access files as text and compare it with Meld, a free diff tool.
It’s been over a month into 2017, and there is already a sophisticated Gmail phishing email making it rounds. New techniques and tactics, have given hackers a way to authentically impersonate your contacts.How it Works The attack works by targeti…
In Microsoft Access, learn different ways of passing a string value within a string argument. Also learn what a “Type Mis-match” error is about.
Polish reports in Access so they look terrific. Take yourself to another level. Equations, Back Color, Alternate Back Color. Write easy VBA Code. Tighten space to use less pages. Launch report from a menu, considering criteria only when it is filled…

756 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