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Issuing UPDATE in COBOL-DB2 program without CURSOR

 
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bosalting

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Joined: 02 Jun 2007
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Location: Philippines

PostPosted: Mon Sep 10, 2007 11:04 am    Post subject: Issuing UPDATE in COBOL-DB2 program without CURSOR
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Hi everyone,

Im wondering, there's an impedance mismatch between set-level processing of DB2 and record-level processing of COBOL.. That's why we use CURSORs right? Would it be possible to UPDATE a table in one blow, affecting several rows in a program. If its possible, is it advisable resource-wise? A related reading material would be most appreciated..
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stodolas

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Joined: 13 Jun 2007
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PostPosted: Mon Sep 10, 2007 5:30 pm    Post subject:
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You don't need cursors to do updates to a table. The only time a cursor is needed is when reading multiple rows from a table.
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bosalting

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PostPosted: Thu Sep 13, 2007 12:58 pm    Post subject:
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Steve,

Yes you do need a CURSOR if you want to update a table with multiple rows. You UPDATE it one at a time. Thats why in the CURSOR declaration for an update, you use keywords FOR UPDATE OF...
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stodolas

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PostPosted: Thu Sep 13, 2007 6:31 pm    Post subject:
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But, if you do this

Code:

EXEC SQL
    UPDATE TABLE
    SET COLUMN1 = SomeVal
END-EXEC


I have updated multiple rows without using a cursor....
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dick scherrer

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Joined: 23 Nov 2006
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PostPosted: Thu Sep 13, 2007 7:12 pm    Post subject:
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Hello,

Quote:
Yes you do need a CURSOR if you want to update a table with multiple rows. You UPDATE it one at a time
No, you do not have to use a cursor to update multiple rows. You can update multiple (selected) rows in a table by specifying a WHERE and you can update every row in a table if you do not specify a WHERE.

You update one row at a time when you are updating a row that was read by a cursor.
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