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Selecting FROM/INTO same cursor
Message
De
04/08/2008 21:14:15
 
 
Information générale
Forum:
Visual FoxPro
Catégorie:
Codage, syntaxe et commandes
Versions des environnements
Visual FoxPro:
VFP 8 SP1
Divers
Thread ID:
01336417
Message ID:
01336465
Vues:
13
>It's just a guess but It looks like VFP SQL Engine "hides" original cursor in order to allow creation of a cursor with the same name.
>Can you post the real query?
>
lcReturn = thisform.odata.Get_RMA_Status_By_Customer(ldteStart, lDteEnd, lcCustomer, lcStatus)
 
SELECT * FROM (lcReturn) ;
 WHERE rma_no IN (SELECT rma_no FROM (lcReturn);
                   WHERE activity = "Passed - waiting for source" ;
                    AND EMPTY(date_end)) ;
  INTO CURSOR (lcReturn)

etc
It seems to be the combination of the same cursor for the FROM, IN, and INTO portions of the query. Several variants worked quite well.

I also tried putting the actual cursor name, rather than the variable reference, into the query and got the same error.

FWIW, I get the same error using VFP 9

I have alternatives which are working so this is not a big issue for me. I was, and still am, curious as to what might be happening within VFP to cause this problem.

Thanks for any insight

.........Rich




>
>>We have a module which creates a cursor and then returns its name. I need to further refine the selection but I'm getting an error that I'm hoping somebody here can explain.
>>myCursor = thisform.get_some_date(params)
>>this code works
>>SELECT * from (myCursor) WHERE id IN ;
>>  (SELECT id FROM (myCursor) WHERE condition);
>>  INTO CURSOR DifferentName
>>
>>but this code
>>SELECT * from (myCursor) WHERE id IN ;
>>  (SELECT id FROM (myCursor) WHERE condition);
>>  INTO CURSOR (myCursor)
>>
>>generates the Open Table dialog and then an error because it can't find the cursor (myCursor).
>>
>>It also works if I code it as
>>SELECT id FROM (myCursor) WHERE condition INTO CURSOR curHold
>>SELECT * FROM (myCursor) src;
>>                  JOIN curHold ch ON ch.id = src.id;
>>  INTO CURSOR (myCursor)
>>
>>I'm curious as to what causes MyCursor to close when using it for the FROM, IN( ), and INTO CURSOR.
>>
>>Any thoughts appreciated.
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