🚀 go-pugleaf

I have a database of phone numbers and names like this:

phone VARCHAR(10);
name VARCHAR(20);

I want to be able to enter a phone number and check the database for a match 
and if found, display the name.  If a match is not found, then a name can be 
entered and a new record will be added.

The problem is I am using TDBEdit controls on the form which display the 
current value of the data fields to which they are linked.  How can I blank 
the DBEdit control out and allow it to accept the phone number which I will 
be searching on.

If phone number is the primary key then I can do it by calling SetKey() then 
EditKey() on the ClientDataSet and ReadOnly = false on the phone TDBEdit. 
But what if the phone number is not the primary key and I want to use 
Locate() instead to find the matching phone number ?

In advance,
Thank you,
Curt