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MQSeries.net Forum Index » WebSphere Message Broker (ACE) Support » Sort order in ESQL DB-Access

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Armin
PostPosted: Mon Oct 15, 2001 9:54 am    Post subject: Reply with quote

Novice

Joined: 24 Jul 2001
Posts: 15
Location: Germany

in a Compute Node I have to access a database table twice, the sort order ist different for each access. In ESQL I cannot use "ORDER BY" or "GROUP BY". Do I have to implement my own sort? I can´t believe that there is no other way.

Armin
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NickB
PostPosted: Tue Oct 16, 2001 12:28 am    Post subject: Reply with quote

Centurion

Joined: 20 May 2001
Posts: 107
Location: Zurich Financial Services

Armin

I guess you could form up your SQL including the ORDER BY clause and then use the PASSTHRU statement.
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Outdesign
PostPosted: Tue Oct 16, 2001 3:06 am    Post subject: Reply with quote

Apprentice

Joined: 16 Sep 2001
Posts: 38
Location: Hampshire, UK

To further explain ...

MQSI ESQL supports a subset of existing SQL functionality.

PROS:
The code is DBMS independant, ie the same code will run against any user database.

CONS:
The supported subset is limited, ie the SELECT statement does not support the ORDER BY clause.

In order to bypass the MQSI ESQL parser, you can use the PASSTHRU function or statement.
Any SQL code written within the PASSTHRU function will not be parsed by the MQSI ESQL
parser and will be passed directly the DBMS. This allows you to write DBMS specific code
and to use some of the functionality not supported by the MQSI ESQL.

For example :

-- option 1
SET OutputRoot.XML.Test.SQLResult_1[] =
(SELECT C.name FROM Database.CUSTOMER AS C);

-- option 2
SET OutputRoot.XML.Test.SQLResult_2[] =
PASSTHRU('SELECT C.name FROM CUSTOMER AS C ORDER BY C.name');
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