How to get the primary key to execute an update statement [closed]

Answer 1

If you are doing an UPDATE the record must already exist in your table. Roughly your application needs the following process:

1. Read the record from the database
2. Put data from the record into your GUI controls and also keep the ID value somewhere.
3. Now the user hits "Save": You transfer the values from GUI controls into your PreparedStatement and use the ID from step 2 to build the where parameter.
4. Commit.

If you want to create a new record, you skip step 1 and therefore have no ID value. Then instead of doing an UPDATE in step 3 you will need to do a INSERT.