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Composite primary keys
Message
De
03/12/2004 08:31:49
Hilmar Zonneveld
Independent Consultant
Cochabamba, Bolivie
 
 
À
03/12/2004 05:17:58
Information générale
Forum:
Visual FoxPro
Catégorie:
Base de données, Tables, Vues, Index et syntaxe SQL
Divers
Thread ID:
00966059
Message ID:
00966652
Vues:
7
>That is what I understood from this sentence in your article :
>>This program offers some interesting additional options. One option that I find very interesting is "Allow blanks", for the "Insert" case. The idea is that you can leave a field blank, but if you write a value, the referential integrity functions do the verification in the other table, to see whether it is a valid value.
>
>The possibility to have referential integrity on nullable fields is important to me, so this alone would already be a reason to research for TaxRI...

Ah, I had quite forgotten about that.

While I didn't actually use it, the idea is to have RI that either (a) forces you to have a valid FK, that is, one that is contained in another table, or (b) leave it blank.

The options which I found most useful was to disable RI temporarily. This is sometimes useful when you need to update data.

Also, I like the nice and compact code - about 1/10 of the size of the code created with the standard RI-builder.

> (I have not found it yet).

Download #9923

Unfortunately, it is tricky to find this one.
Difference in opinions hath cost many millions of lives: for instance, whether flesh be bread, or bread be flesh; whether whistling be a vice or a virtue; whether it be better to kiss a post, or throw it into the fire... (from Gulliver's Travels)
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