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host variable usage in query

 
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shankarm

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Joined: 17 May 2010
Posts: 175
Location: India

PostPosted: Wed Oct 30, 2013 6:00 pm    Post subject: host variable usage in query
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Hello,

I am writing a cobol code with cursor. Cursor declaration below,

Code:

EXEC SQL
         DECLARE LOADCRSR CURSOR FOR
              SELECT DBR,...
              FROM  DM_IND             
              WHERE DBR = :WS-OLD-A   
              ORDER BY  SEQ_NBR               
              FETCH FIRST 25 ROWS ONLY       
END-EXEC


In the above, I want to make 25 configurable. Number of rows to be fetched may vary for every run. i have to pass it from JCL as PARM. I cannot substituite it with a host variable correct?

Please advise.
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dbzTHEdinosauer

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Joined: 20 Oct 2006
Posts: 6970
Location: porcelain throne

PostPosted: Wed Oct 30, 2013 9:30 pm    Post subject:
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1. when reading the syntax of a command, when it says host-variable it means host variable,
when it says n it means a numeric literal.
when it does not stipulate that a host variable can be used (it is not stipulated when host-variable is not contained in the syntax for that command), (i love it when i can find a legal use of a double negative!)
then a host variable cannot be used.

2. why would you want the number of rows to be fetched to be dynamic?
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shankarm

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Joined: 17 May 2010
Posts: 175
Location: India

PostPosted: Wed Oct 30, 2013 10:58 pm    Post subject:
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Quote:

why would you want the number of rows to be fetched to be dynamic?


This is the requirement customer says.

I understand that i can fetch all the rows and later when i write the output, i can restrict the number of rows written to the output. I just little concerned about the performance.

This particular table can have thousands of records for each DBR (Refer where condition in query to understand how DBR is used) and i have more than 800 Million records to extract.
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