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  3. March 2007

Re: Dynamic SQL and Paramaterization

Based on statement number 2, I assume you are writing an SQL Stored Procedure on the iSeries...
So, the short answer is no... if you must use dynamic, the parameter markers are set positionally. Even if you were to use the SQLDA, you would still have to specify the values by position.
As for the academic question... yes, when you don't parameterize the query (use markers) then you must prepare the statement each time it is executed. If you use markers, you can isolate the prepare from repeated execute calls.
As for performance differences between the two, it's minimal when you prepare, execute, return. It adds up when you prepare, repeatedly execute and return. 


Ryan Hunt wrote:

Microsoft guy here...bear with me.

I am writing a DB2 proc that will utlize dynamic SQL to build the SQL String
based on parameters recieved at call time.  So far I've found 2 ways to
include a portion of my params within the query:

1)  SET SQL_STMT='SELECT * FROM books WHERE bookid=?'
or
2)  SET SQL_STMT='SELECT * FROM books WHERE bookid=' || CAST(parm1 as
varchar(x))

My issues are that with option 1 the lining up of paramter markers (?) seem
to be based on the order they are defined in the procedure.  (i.e. the first
? get the first defined parameter, the second get the second and so on).
This will not work for me in this particular proc.

My other issue is simply an academic one.  On the DBMS I am accustomed to,
not actually paramterizing your queries is a last resort type of thing.  So,
I have been trying to avoid it on the AS400 as well (maybe without reason
though...).

Anyway, is there a way to pass named variables/parameters to my D-SQL?

Thanks in advance.

Ryan

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