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IIF syntax
Message
De
16/09/2015 08:49:38
Mike Yearwood
Toronto, Ontario, Canada
 
 
À
15/09/2015 14:57:45
Information générale
Forum:
Visual FoxPro
Catégorie:
Codage, syntaxe et commandes
Titre:
Versions des environnements
Visual FoxPro:
VFP 9 SP2
OS:
Windows Server 2012
Network:
Windows 2008 Server
Database:
MS SQL Server
Application:
Web
Divers
Thread ID:
01624559
Message ID:
01624681
Vues:
71
>>>>Hi Karen
>>>>
>>>>First things first - design. The point of databases is not to do things Row By Agonizing Row, but to think in terms of sets. It is very rare to write a replace command to affect one record. If you are doing that, to me, it suggests this is happening inside a larger loop. 1 replace commands such as this
>>>
>>>Design?
>>>If one like to change multiple records there is SQL UPDATE. Why learning outdated syntax? Is there realy a sense in NEXT xx or WHILE xx? The data should not depend on order .... (Except you are dealing with VFP sources like vcx,scx frx ....)
>>>
>>>The good on REPLACE is that it can be used on a single record without any change of record pointer and superfluous expression. Here it has a great advantage to SQL UPDATE. So I would do what the OP seems to do (altering a field on a condition) on some pre-save checks on record level using REPLACE.
>>
>>REPLACE has another benefit
>>
>>REPLACE ;
>>field1 with value1, ;
>>field2 with value2
>>
>>is better than
>>
>>UPDATE (field1, field2) values (value1, value2)
>>
>>With long commands, having each field near the update value is a benefit.
>
>You're confused with INSERT - SQL syntax.
>
>The syntax of UPDATE - SQL is:
>
>UPDATE MyTable SET ;
>  Column1 = Expression1 ;
>  , Column2 = Expression2 ;
>  ...
>
Having an = between each column and corresponding expression is closer and clearer than WITH.

Yep - was thinking INSERT.
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