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Exact and deleted recs - did everybody know this but me?
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To
24/07/2006 10:43:19
General information
Forum:
Visual FoxPro
Category:
Coding, syntax & commands
Miscellaneous
Thread ID:
01139176
Message ID:
01139197
Views:
23
Add NOFILTER.

>I just discovered that SET EXACT and SET ANSI affect whether or not a SELECT SQL statement will return deleted records as deleted or not.
>
>Am I the only person who didn't know this?
>
>According to the VFP9 help file in fact, SET EXACT is supposed to have no effect on a SELECT SQL statement at all. SET ANSI is supposed to affect how strings are compared in a SELECT statement. And I can't find anything in the help file to explain how deleted records are treated by EXACT and ANSI.
>
>So why do they both affect how deleted records are retrieved?
>
>Here is an example of what I'm seeing.
>
>
>CLOSE DATABASES all
>
>CREATE TABLE test (field1 c(1))
>FOR x = 1 TO 10
>  INSERT INTO test (field1) VALUES (chr(x+64))
>ENDFOR
>
>GOTO 8
>DELETE
>
>CLOSE DATABASES all
>SET DELETED OFF
>SET ANSI OFF
>SET EXACT OFF
>
>WAIT WINDOW "Ansi off, Exact off" NoWait
>SELECT * FROM test	&& browse should show record 8 as deleted
>CLOSE DATABASES all
>SET EXACT ON
>
>WAIT WINDOW "Ansi off, Exact ON" NoWait
>SELECT * FROM test	&& browse should show no deleted records
>CLOSE DATABASES all
>SET EXACT OFF
>SET ANSI ON
>
>WAIT WINDOW "Ansi ON, Exact off" NoWait
>SELECT * FROM test	&& browse should show no deleted records
>CLOSE DATABASES all
>SET EXACT OFF
>SET ANSI OFF
>
>WAIT WINDOW "Ansi off, Exact off" NoWait
>SELECT * FROM test	&& browse should show record 8 deleted again
>
--sb--
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