Question: Why are some records lost when I use the Locate method in the cmkLimitedBufferSize mode?

Answer: This effect appears only if you incorrectly set the “order by” clause in the Select query. For the cmkLimitedBufferSize mode in “order by” you should use fields with the unique values for each record. So fields values in the “order by” clause should not repeat, otherwise you will get bugs not only when you use Locate, but also when you simply scroll on the records.


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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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