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Combine 2 or more cursors
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Information générale
Forum:
Visual FoxPro
Catégorie:
Base de données, Tables, Vues, Index et syntaxe SQL
Divers
Thread ID:
00568592
Message ID:
00568790
Vues:
17
Hi Sergey,

One more thing Macro is OK but if can take all small SQLs into 1 prg
then I don't need to use any Macro. The question is if I save any
time by breaking it to small SQLs and combing it, versus this Macro
substitution.

Regards,

Doron

>
>You can get around this limitation by using macro substitution. Something like
lcFiledLIst = "Filed1, IIF(filed2, ...), .."
>lcFrom = "From Mytable"
>lcJoin = "JOIN ..."
>lcWhere = "Where ...."
>lcGroupBy = ...
>lcOrderBy = ...
>
>SELECT &lcFiledLIst &lcFrom ;
>  &lcJoin ;
>  &lcWhere ;
>  &lcGroupBy ;
>  &lcOrderBy ;
>INTO CURSOR ResultCursor
AS you can see the select command is much shorter than 8,192 characters. Just remember that each macro substitution is limited to 8,192 characters also.
>
>>Hi Sergey,
>>
>>That was not for a specific SQL statement I have developed a query and report
>>and engine and trying to solve problems in general. Also you can check this
>>link to see how that query engine works: http://www.dfarber.com/query_engine.htm
>>
>>But if you have some ideas for SQL statement improvement please let me look at
>>that. In some cases instead of using long tables names it is possible to have
>>an alias with short name, but that’s may not be enough in some cases when there
>>are some expression against each field like IIF() and more.
>>
>< snip >
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