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MQSeries.net Forum IndexWebSphere Message Broker (ACE) SupportESQL NULL handling for scalar values?

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pcoffey
PostPosted: Tue Oct 24, 2006 5:59 am Post subject: ESQL NULL handling for scalar values? Reply with quote

Apprentice

Joined: 03 Feb 2006
Posts: 33
Hi,

I have a an ESQL CHAR variable which I use to retrieve a value from a database table column - using THE (SELECT T.COL FROM Database.TABLE AS T)

I want to test the returned value for NULL and was using

IF nextCode = NULL THEN...

However, this fails as, according to the ESQL help, “ESQL provides a full set of comparison operators (predicates). Each compares two scalar values and returns a Boolean. If either operand is null the result is null. Otherwise the result is true if the condition is satisfied and false if it is not.”

As such, I get the following in a user trace:

Evaluating expression ''nextCode = NULL'' at ('ie.xxx.ifg.shared.xref.AssignCode', '23.20'). This resolved to ''NULL = NULL''. The result was ''NULL''.

Surely there is some way I can to test the scalar value for NULL? Has anyone any suggestions?

Thanks,
Pauline
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pcoffey
PostPosted: Tue Oct 24, 2006 6:13 am Post subject: Reply with quote

Apprentice

Joined: 03 Feb 2006
Posts: 33
Finally found the IS test buried in the ESQL reference.
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