PB error handling

Common Errors include system errors, database errors, and data window syntax errors. 1. System-level errors can be handled through the systemerror event or try... catch... finally... end try; 2. database errors can be obtained through the transcation attribute if an embedded SQL statement is used, and data window or data storage can be obtained through the dberror event (the error capture to process data storage must be implemented through inheritance ); 3. A syntax error occurs in the data window. For example, when the setfilter and find functions are used in datawindow, a syntax error prompt will pop up automatically, you can use datastore to handle such errors, because the syntax errors of the setfilter and find functions in datastore are not automatically displayed, but are returned to-1. This is the case in pbexample and PFC.