Question: What does the option PoForceIsNull mean?

Answer: Hmm :), this a great FIBPlus feature. For example, you have a query:

delete from Table1 where Param1 =?Param1 and Param2 =?Param2

Suppose, that Param2 is null. Standard components simply set Param2 buffer to nil and that's all. But actually, it is necessary to send another query to a server:

delete from Table1 where Param1 =?Param1 and Param2 IS NULL

Otherwise, the server will not delete a necessary record as it just cannot find such a record. The PoNoForceIsNul option allows TpFIBQuery (and TpFIBDataSet) to change SQL with NULL parameter values if necessary. If you have record with NULL fields in your selecting query, the "delete" query won't work until you set PoNoForceIsNul to True.


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Our 911 dispatch center needed a program to monitor the status of equipment used in emergency situations. If one dispatcher modified the status of a piece of equipment, all the other dispatchers needed to see this change immediately. The most elegant way to implement this was by using Firebird Events to asynchronously notify all the users whenever a pertinent change had occurred at the database server. After failing to implement this myself using the Firebird API, I bought a copy of FIBPlus. I dropped a Database, EventAlert and ErrorHandler control into a C++ Builder DataModule and within minutes I had all the functionality I needed. I was able to complete the project quickly and the users are thrilled with the results because I gave them more features than they originally asked for. >>

Darryl Caillouet Programmer City of Little Rock
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