Microsoft Knowledge Base

• Microsoft Visual FoxPro for Windows, versions 3.0, 3.0b, 5.0, 5.0a

SYMPTOMS

You cannot trap duplicate key errors such as the following:

   Uniqueness of index "name" is violated (Error 1884)

RESOLUTION

For a workaround that uses record buffering, place the following code in the Valid method of a TextBox of the Grid:

   IF .NOT. TABLEUPDATE()
   *Invalid Primary Key Trapped here since Error method of Grid does not.
      =AERROR(arrtemp)
      =MESSAGEBOX('Error:'+STR(arrtemp(1,1));
           +CHR(13)+arrtemp(1,2),0,'Error')
      RETURN 0
   ENDIF

STATUS

Microsoft is researching this problem and will post new information here in the Microsoft Knowledge Base as it becomes available.

MORE INFORMATION

Steps to Reproduce Behavior

1. Issue the following two lines in the Command window:

         CREATE DATABASE primerr
         CREATE TABLE tblprim (fld1 c(3) PRIMARY KEY, fld2 c(2), fld3 c(3))
   

2. Add several records to the above table.

3. Create a new form by clicking New from the File menu.

4. Click Form in the dialog box and click the New File button.

5. When the form comes up, right-click on the form and select DataEnvironment from the Shortcut menu.

6. When the DataEnvironment window comes up, right-click in the window and select Add Table from the Shortcut menu.

7. When the Open dialog box appears, select the table created in Step 1.

8. Drag and drop the table from the DataEnvironment to the form to make a Grid.

9. Run the form and type in a duplicate value for a record in fld1 column and move off the record.

10. Note Visual FoxPro presents an error message.

11. Choose Revert and close the form.

12. Modify the form.

13. On the property sheet, select the combo at the top and choose the Grid.

14. Find the Grid's Error method and add in a WAIT WINDOW command.

15. Repeat step 9.