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Record pointers on empty cursors/tables
Message
De
02/02/2004 13:57:36
 
 
À
02/02/2004 13:36:03
Jay Johengen
Altamahaw-Ossipee, Caroline du Nord, États-Unis
Information générale
Forum:
Visual FoxPro
Catégorie:
Base de données, Tables, Vues, Index et syntaxe SQL
Divers
Thread ID:
00872917
Message ID:
00873079
Vues:
20
Hi Jay,


>I like that, but the cursor/table may be unknown at design time.
Is there a way to know the key field (or expression) of the current ALIAS?

A partial solution exist, but it is slow:
with 
ATagInfo(ArrayTags)
you can search a PRIMARY or CANDIDATE index ( but only if indexes are open ), 
store :
- nWorkArea = SELECT()
- tagnumber 
- tagvalue = evaluate(tagexpression)

when you restore record position,use
SEEK(m.tagvalue,m.nWorkArea,m.tagnumber)
but if
do something
remove index, remove table, change table schema .....
it is insufficient.

A general solution, without restrictions is impossible.

Fabio
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