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Primary Keys when deleted can't be reused untill pack
Message
From
07/05/2000 03:50:34
Walter Meester
HoogkarspelNetherlands
 
 
To
06/05/2000 20:06:34
General information
Forum:
Visual FoxPro
Category:
Databases,Tables, Views, Indexing and SQL syntax
Miscellaneous
Thread ID:
00367026
Message ID:
00367061
Views:
16
Gary,

In addition to what Evan and Craig said, the real problem lies in the fact that DELETED() records are still stored in the table. This is exclusively (that I know of) a xBase problem.

I'm not that fond of using generated key's in every table (though it has got its use in most tables). I believe there are cases where generated key's do not make sense at all, So if you think you've got a good reason to use a intelligent primary key, the best you can do is add a index filter 'FOR NOT DELETED()' and add another regular index on the same expression without a filter to take advantage of rushmore.

Walter,


>How are developers handling the problem where a primary key and data record is added to a table. The user decides to start the record over so they delete the record. When they start to add the record again with the same key, they will get a duplicate key message because the key, although deleted, is still in the index, until I pack the file. One idea would be to change the key when I delete the record. Is there a better approach anyone is using.
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