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Update phone number

Monica Marcus
Ranch Hand

Joined: Oct 17, 2012
Posts: 43
I want to write a method to change the phone number of a certain contact, identified by name. Here's the method:

As you see I tried several variants, but I always get zero rows updated and the phone number is not changed. Any idea how to get it done? Many thanks in advance for help.
It is sorta covered in the JavaRanch Style Guide.
subject: Update phone number