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Database layout question..
Message
De
07/10/1999 12:18:59
Cetin Basoz
Engineerica Inc.
Izmir, Turquie
 
 
À
07/10/1999 10:36:07
Information générale
Forum:
Visual FoxPro
Catégorie:
Base de données, Tables, Vues, Index et syntaxe SQL
Divers
Thread ID:
00273701
Message ID:
00273770
Vues:
21
>Does anyone know what the basic layout of how a FoxPro 2.6 table differs from the Visual FoxPro 6.0 at the bit level. (i.e. bit 1 is the deleted record bit)
>
>Thanks in advance
>-Edison


Deleted is byte not bit (first byte in record, initialized to 0x20).
They're quite similar as far as I remember. Differences :

FP2.x
12-28 Reserved
29 Codepage (Same)
30-31 Reserved
n+1 Header record terminator (Same)
After n+1 doesn't have 263 bytes backlink info and data starts.

Field subrecords :
18-32 Reserved

So basically if you remove n+2,n+264 bytes from a VFP table, it's practically same as FP2.x table.
Of course byte offsett 0 file types and byte offsett 11 in field subrecords are only the ones that FP2.x knows :) (ie: No 0x30 for VFP or dBase4 SQL files).
Cetin
Çetin Basöz

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