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Insert field using Alter Table
Message
De
28/10/2007 15:48:46
Mike Yearwood
Toronto, Ontario, Canada
 
 
À
28/10/2007 13:51:16
Information générale
Forum:
Visual FoxPro
Catégorie:
Base de données, Tables, Vues, Index et syntaxe SQL
Versions des environnements
Visual FoxPro:
VFP 9
Divers
Thread ID:
01264579
Message ID:
01264602
Vues:
14
>>>Dear All,
>>>
>>>I want to programmatically insert field into database table after
>>>specific field.
>>>Normally Alter Table will add field on the bottom of fields order
>>>whereas I want to add it let say as 3rd column in table.
>>>
>>>Is this possible and how ?
>>>
>>>TIA
>>
>>Not with ALTER TABLE, You could use AFIELDS to get all fields in array insert new array element at 3th position and then create table from that array, append records from all table, delete old table and rename newly created one to old name.
>>The big question here is why?
>
>Answer to 'Why' question is much easier then 'How' which you proposed :)
>There are functionalitis exposing fields for selection by user so I want simply for that field to appear in certain sequence.
>My dbc upgrade routine will do this correctly, but I don't want to send entire database upgrade just for sake of one added column, so I tought this can be done somehow on the fly.

If you have a meta-data table, add the field sequence to it and use that to display field names.

It takes the same amount of time to alter table add column as it does to COPY ALL TO MYTEMP.DBF for 1 million records. This suggests the field is added to a new structure and the data is appended.
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