Knowledge Base

FIX: SQL-SELECT into Array Causes Illegal Operation

Article ID: 171272

Article Last Modified on 8/14/1999

APPLIES TO

This article was previously published under Q171272

SYMPTOMS

Using a SQL-SELECT statement to populate an array from a FoxPro 2x table containing deleted records with DELETED set on causes the operating system to close Visual FoxPro 5.0.

When running under Windows 95, the following error appears:
This program has performed an illegal operation and will be shut down.
In Windows NT 4.0, the following error appears:
An application error has occurred and an application error log is being generated.
VFP.exe
Exception: access violation <error number>, Address: <memory address>.
In both cases, the operating system then closes Visual FoxPro.

RESOLUTION

Do not issue a SET DELETED ON command and simply rewrite the SQL-SELECT statement, as in the following example: 
   SELECT * FROM ZTEST INTO ARRAY Zjunk WHERE DELETED()=.F.
-or- 
   SELECT * FROM ZTEST INTO ARRAY Zjunk WHERE !DELETED()
Also, the results of the SQL-SELECT statement could be directed to a destination other than to an array.

STATUS

Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article. This bug has been corrected in Visual FoxPro 5.0a and does not occur in Visual FoxPro 3.x.

MORE INFORMATION

Steps to Reproduce Behavior

  1. Run the following code in a program file or line by line from the Visual FoxPro Command window: 
          CLEAR
      SET SAFETY OFF
      USE HOME()+"samples\data\customer.dbf" EXCLUSIVE
      COPY TO HOME()+"Ztest.dbf" TYPE FOX2X
      SET SAFETY ON
      CLOSE ALL
      USE HOME()+"Ztest.dbf"
      DELETE ALL FOR RECNO() < 10
      USE
      SET DELETED ON
      SELECT * FROM HOME()+"Ztest" INTO ARRAY Zjunk
      ? ALEN(zjunk)
      USE

Keywords: kberrmsg kbbug kbfix kbvfp500afix KB171272


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