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Building a SQL statement on the fly
Message
De
11/09/1999 23:08:33
 
 
À
10/09/1999 13:19:26
Information générale
Forum:
Visual FoxPro
Catégorie:
Base de données, Tables, Vues, Index et syntaxe SQL
Divers
Thread ID:
00263324
Message ID:
00263744
Vues:
25
>>>I've got a class method that builds a SQL statement on the fly based on metadata. The field list has to be built dynamically before issuing the SQL call, as in:
>>>
>>>SELECT &lcFieldList ;
>>> FROM &lcTable ;
>>> INTO CURSOR lvNormalized
>>>
>>>The field list has to be dynamically built from a table of field mappings to normalize the data before moving it to a data warehouse. It all works fine, the hard part is done. But early on in testing I found that the lcFieldList variable can end up exceeding 254 characters, which generates an error. I've gotten around it in a cheesy kind of way, but I was wondering if anyone had any ideas on a more permanent solution.
>>>
>>>TIA
>>
>>Is it exceding 254 Characters or 254 Fields? Cause a string variable can contain like 16 million characters.
>>
>>BOb
>
>Yes, but there is a limit to the length of a command that can be executed with Macro substitution. Don't remember exactly, but 254 sounds like a good candidate.

Ah... then he should probably build the whole SELECT statement into a string variable then execute it with the eval() function.

BOb
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