Plateforme Level Extreme
Abonnement
Profil corporatif
Produits & Services
Support
Légal
English
Rushmore work differently in VFP9?
Message
 
À
10/03/2005 09:48:29
Information générale
Forum:
Visual FoxPro
Catégorie:
Base de données, Tables, Vues, Index et syntaxe SQL
Versions des environnements
Visual FoxPro:
VFP 9
Database:
Visual FoxPro
Divers
Thread ID:
00994380
Message ID:
00994431
Vues:
15
Brian Based on Tore answer this code shows FULL optimisation in Both cases (VFP9):
SET ANSI OFF
SET EXACT ON
CLEAR
* Turn rushmore reporting on
SYS(3054,2)
* Create a test cursor
CREATE CURSOR test (field C(10))
INDEX on field TAG field
INDEX on PADR(ALLTRIM(field),5) TAG field_t
* Put some data in the cursor
FOR i = 1 TO 10000
 INSERT INTO test VALUES (SYS(2015))
ENDFOR

* Determine the last value
cValue = LEFT(test.field,LEN(ALLTRIM(test.field))-1)
* Try the untrimmed index
?"This one works"
?"---------------------------------"
SELECT * FROM test WHERE field = cValue INTO CURSOR index
* Try the trimmed index
?
?"This one does not work"
?"---------------------------------"
SELECT * FROM test WHERE PADR(ALLTRIM(field),5) = cValue INTO CURSOR noindex
Against Stupidity the Gods themselves Contend in Vain - Johann Christoph Friedrich von Schiller
The only thing normal about database guys is their tables.
Précédent
Suivant
Répondre
Fil
Voir

Click here to load this message in the networking platform