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SEEK and LOCATE and UPPER and ALLTRIM
Message
De
14/01/2009 07:43:13
Jay Johengen
Altamahaw-Ossipee, Caroline du Nord, États-Unis
 
 
À
14/01/2009 03:00:23
Information générale
Forum:
Visual FoxPro
Catégorie:
Codage, syntaxe et commandes
Divers
Thread ID:
01373413
Message ID:
01373476
Vues:
22
>>There is an index on TableFormProperties.TableName, but the date is in mixed case, so I can't do a SEEK (or can I?). I'm doing this in a LOCATE, but that seems a bit wrong somehow. Is this the right way to do it, or is there a better way.
>>
>>lcTableName = "MyTableName"
>>SELECT TableFormProperties
>>LOCATE FOR ALLTRIM(UPPER(TableName) = ALLTRIM(UPPER(lcTableName))
>>
>
>It's my opinion that Alltrim() should be avoided as much as possible, unless you really need it. This code will give the same result, and will be much faster if you have an index tag on upper(Tablename). It will also be independent of the Set Exact setting:
>lcTableName = "MyTableName"
>SELECT TableFormProperties
>lcTableName = padr(lcTableName,len(TableName))
>LOCATE FOR UPPER(TableName) == upper(lcTableName)
I should have stated that the index does not use UPPER, but I see if one was put on in the future it would affect performance.
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