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Questions And Answers for PowerBuilder Interviews

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Question: #35 of #131

Section: DataWindow

Version: 5.0 or later

Question

Explain the following error: 'Row(s) changed between retrieve and update'. Also explain how you will get rid of that error?

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PowerBuilder reports this error when some one/process updates the row after you retrieve it but before apply the changes. POWERBUILDER detects this type of error when you include the TimeStamp column in the DataWindow or use the 'Key columns and Updatable columns' in the WHERE criteria. We can't avoid this error. The solution to this problem would be, reselect the row that caused the error and display it to the user with appropriate message and then update the database again. You can use ReSelectRow() function to get the latest values for the error row.

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