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01/09/2005 18:41:18
 
 
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Forum:
Visual FoxPro
Catégorie:
Base de données, Tables, Vues, Index et syntaxe SQL
Titre:
IN question
Versions des environnements
Visual FoxPro:
VFP 9
OS:
Windows XP SP2
Database:
Visual FoxPro
Divers
Thread ID:
01046060
Message ID:
01046060
Vues:
60
Hi All:

I have a table - Test - that contains 4 records, as follows:
Code    Desc
111     Dog
222     Cat
333     Elephant
444     Fish
I want to give the user the ability to query on a variable number of code or 'ALL' the codes.

In the following example, she has picked '111' and '222', so I constructed an array in the calling program with a length of 2. If she would have requested '111', '222', and '444', I would have had to construct an array of 3 members and some figured out how to accommodate
the third member in my SQL syntax. If she requests all, then I need to set one of the members to ‘’ and since everything is equal to ‘’, all for records will be returned.

Isn’t there a more elegant way to do this?
LPARAMETERS taCodeList
* taCodeList[1] = '111'
* taCodeList[2] = '222'

SELECT Test.code, Test.Desc ;
 FROM Test ;
   WHERE Test.code IN(taCodeList[1],taCodeList[2]) ;
   INTO CURSOR result
Thanx,

Yossi
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