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Normally, you won't need this function, because the exception handling mechanism
in PCL provides this when an exception is thrown.
This query returns a short, representing the error code of the last command or queryGetting the last error code and string. If you follow PGetLastError with PGetLastErrorStr (or vice versa), only the first query returns a valid error code or message (unless the first query fails). The second query gets the error code or message from the first query. A successful query (or command) automatically resets the parameter block.
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