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change fieldname of a table

Posted on 2003-12-09
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Last Modified: 2010-04-05
Hi,

is there any way that I can change a field name in  database table in runtime ?

Im using DBBase IV as my database table

I use :
         TableData.open;
         for i :=0 to TableData.FieldCount -1 do
           begin
                 TableData.Fields[i].FieldName := ShareID[i];
           end;

thanks alot ;)
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Question by:allie910
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Stefaan earned 20 total points
ID: 9910301
I think you will have to issue an SQL Command for that.  Also I don't think there will be an easy way to modify the name of the column by itself.  I think you will have to do it in different steps :

First :

ALTER TABLE <TableName> ADD <NewFieldName> <DataType> ...

This will create a new column in your table with the new field name.  Next you will have to copy all the data from your old field into the new field :

UPDATE <TableName> SET <NewFieldName> = <OldFieldName>

Now you have copied all the old data into the new column, you can delete the old column from your table :

ALTER TABLE <TableName> DROP COLUMN <OldFieldName>

Depending on your Database that SQL Command might vary, but it should look similar to what I typed out.  As you see reneaming a field in your database itself will be a 3 step proces.

Regards,


Stefaan
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Expert Comment

by:kretzschmar
ID: 9910414
told i already in a previous q, stefaan

allie, go here
http://info.borland.com/devsupport/bde/bdeapiex/dbidorestructure.html

and read example 3

btw. a fieldname cannot be a number

meikl ;-)
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by:Stefaan
ID: 9910431
Bah, didn't see the DBase thingie, well using BDE API calls is a bad idea anyway, since BDE isn't really supported anymore :-P

But if it helps him out, then it should be good.  Otherwise, it would be a good idea to skip the BDE stuff.

Regards,


Stefaan
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Expert Comment

by:delphized
ID: 9911329
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