Java PreparedStatement and ON DUPLICATE KEY UPDATE: how do I know whether row was inserted or updated?

Question

Having following code, how do I know if the execute() method resulted in insert or in update?:

Connection c = DriverManager.getConnection(connectionString);
         


        

Answer 1

Use executeUpdate instead as it returns an int row count.

UPDATE 1: According to the MySQL INSERT ... ON DUPLICATE KEY UPDATE documentation:

With ON DUPLICATE KEY UPDATE, the affected-rows value per row is 1 if the row is inserted as a new row, and 2 if an existing row is updated.

UPDATE 2: INSERT IGNORE may also be an option:

INSERT IGNORE INTO `table`(`field1`) VALUES (?)

executeUpdate should return 1 when a new row is inserted and 0 when there is a duplicate.