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Programs affected by a change in Table

 
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arunswap

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Joined: 23 Mar 2006
Posts: 13

PostPosted: Thu Apr 06, 2006 5:45 pm    Post subject: Programs affected by a change in Table
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If I make a change to a table, how to know the effect that it will have on other programs using that table.
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guptae

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Joined: 14 Oct 2005
Posts: 1190
Location: Bangalore,India

PostPosted: Fri Apr 07, 2006 1:29 pm    Post subject:
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Hi arunswap,

First make a fairscan on that table to identify which programs are using that particular table.

2) What changes u r making in table
a) If u adding new coloumn than u have to change all those program
that have the query like that
Select *
From tablea
Where .....
b) if u renaming some coloumn ( changing fielda to fieldb)than u have
to change name of that Particular colum in each program that have
the sql like

Select fielda
from tablea
Where .....
c) if u changing defination of some coloumn than u have to make
change length of corrosponding host variable in all those pgm which
have query that contain that particular coloumn

Hope it will helpful
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twissi

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Joined: 01 Aug 2005
Posts: 105
Location: Somerset, NJ

PostPosted: Thu Apr 20, 2006 3:39 pm    Post subject:
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Hi Arun,

The first thing you've to do when there was a table change is modifing the DCLGEN & copybook to reflect the change and recompile the associated programs.

Before recompiling the programs you'll have to make sure that you've changed the embedded SQLs accordingly.

As an example, let's assume that there were 10 fields in the table and after the change being applied to the table, there're 11 fields now including the new one added at the end, which is defined as NOT NULL. If your program is doing an insert operation and you haven't modified the SQL, the insert operation will fail giving a code of -407.

The explanation is you were trying to insert a null value into a non nullable column.


In brief, you'll have to change the copybooks/SQL statements depending up on the situation.

Cheers, Twissi.
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