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Re: Speeding up ESQL fetches

Posted By: Madison Pruet
Date: Tuesday, 30 August 2016, at 5:25 p.m.

In Response To: Speeding up ESQL fetches (FLORIAN APOLLONER)

It's been a while since I did this, but doesn't the select statement have and "into" host descriptor that you define. If so, you should be able to define the "into" descriptor so that the data for datetime would be converted into a character string.

But I don't understand why you think this would perform any faster than using a basic PREPARED SQL statement. The purpose of using descriptors is if the client application has no before hand knowledge of the data type that the select statement will be returning. When I wrote cdr check, I had to use descriptors because we had to deal with all data types that the select statement would be based on how the user defined the replicated row. Everything had to be dynamic.

Internally you prepare a dynamic query using descriptors in pretty much the same way that you prepare a select statement. It's just that by using descriptors, you are able to define the data types being returned at runtime rather than at compile time. I don't see how performance would be affected at all by using descriptors because internally it's pretty much the same execution as a static SQL statement. Madison Pruet
Retired and Loving it

On Tuesday, August 30, 2016 4:03 PM, FLORIAN APOLLONER <florian.apolloner@bap.at> wrote:

Hi,

I am trying to speed up a program by fetching a row into a sqlda structure
instead of using EXEC SQL get descriptor 'demodesc' value :i for every
column. So far so good, I can use it just fine to directly assign simple
values into my structures. When it comes to datetime types I am somewhat lost
though. I would like to fetch it as char/string as described in "implicit
conversion" on
https://www.ibm.com/support/knowledgecenter/en/SSGU8G_11.50.0/com.ibm.esqlc.doc/sii061001534.htm
since that would match what the program would use later on (and is currently
doing via individual get descriptor calls). I cannot find a way to do this
with a sqlda struct (which probably makes sense, but maybe I miss something).
Am I missing something or do I really need to create a large fetch buffer,
send everything there and then convert the data to fit my application needs?

Thanks,
Florian

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