How do I rename a column?
In SQL Server, we can use sp_rename. The format is:
So, from ASP, use the following:
One problem you might come across is when you misspell the column or table name, or execute the same rename command twice. You would see this error in SQL Server:
Which translates in ASP to:
Another potential problem is that, in certain scenarios, the following warning can bubble up to ADO code:
This is the warning that is presented in Query Analyzer when you run sp_rename manually. It is a fairly important warning because, while foreign keys, indexes and constraints directly related to the table will be updated, other objects that contain code referencing this column (like views, stored procedures, triggers, and user-defined functions) will break unless you retrofit them with the new names.
This error won't come up in the native ASP error collection, but it will come up in the errors collection of the connection object (which is sometimes used to trap errors from SQL Server). So, ASP knows enough to not balk at this "error," but if your code is using the connection object's errors collection, you will need to know the difference. You can see the errors coming back, using the following code:
Which returns the following to the browser:
So, to prevent this warning from unnecessarily tripping up your error trapping code, you can just ignore those specific NativeError numbers:
In Microsoft Access, we can fall back on ADOX.
If you give a name for a column that doesn't exist (or perhaps by running the script twice, since the old name won't exist after you've renamed it), you'll get this error:
Note that this method is only available when you connect to Access through the JET/OLEDB provider. If you use the Microsoft Access driver or an ODBC DSN, you will get the following error:
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