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VFP seems to get data from a table without opening it!
Message
 
 
À
05/05/2008 15:42:45
Information générale
Forum:
Visual FoxPro
Catégorie:
Problèmes
Versions des environnements
Visual FoxPro:
VFP 9 SP1
Divers
Thread ID:
01315181
Message ID:
01315187
Vues:
22
No, FoxPro will always read from a table/cursor unless WITH clause is used. What is the value of tcDataDict? The USED() function expects an alias and will return .F. if you give it full table name. The SELECT-SQL can work with both.

>I found an unexpected situation:
>
>A method has the following code:
>LPARAMETERS tcDataDict   && Has value of 'DD_Fac_Int'
>LOCAL llCloseDBF,laFields[1,4]
>llCloseDBF = !USED(tcDataDict)
>SELECT _fieldname,_fieldtype,_fieldlen,_field_dec FROM (tcDataDict) INTO ARRAY laFields
>IF llCloseDBF
>   USE IN (tcDataDict)
>ENDIF
>...
>RETURN
>The method is called twice. The first time it works as I expected, namely the (tcDataDict) table is closed after the SELECT.
>
>During the second call llCloseDBF takes on .F. before running the SELECT, and the laFields array is filled as expected, but the (tcDataDict) table is NOT opened, so USE IN (tcDataDict) gives error. Apparently VFP finds the data (perhaps from cache) without opening the (tcTableDict) table. I did not expect this behavior. Should I have expected it?
>
>TIA,
>
>Alex
--sb--
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