Jira issue originally created by user @lsmith77:
Didnt find anything in the docs on this. Is D2 capable of doing an UPSERT  in case I am trying to persist an object that may or may not have been saved previously. Different RDBMS support different syntax for this case. Like MySQL has INSERT .. ON DUPLICATE KEY UPDATE (or even INSERT IGNORE) while the SQL standard defines a MERGE syntax which seems to be gaining support. Of course you can always fallback to a SELECT FOR UPDATE (or if you want to be hacky an INSERT which catches duplicate key violations .. but probably not a good idea since many RDBMS rollback on a failure inside a transaction).
See also http://opensource.atlassian.com/projects/hibernate/browse/HHH-3011 asking for MERGE support
Ideally there would be a way to define on a model or model instance level if merge logic should be applied.
Comment created by robertb:
Doctrine_Record defines a replace() method.
In the MySQL Doctrine implementation, however, it is not the same as INSERT .. ON DUPLICATE KEY UPDATE. The replace() method implemented in DoctrineConnectionMysql uses the REPLACE INTO syntax, which is a DELETE and then INSERT when the key exists. This is fine, except for tables that use auto-increment fields. The delete-then-insert operation yields a new auto-incremented value, whereas INSERT .. ON DUPLICTATE KEY UPDATE would not.
Comment created by @lsmith77:
MySQL (and SQLite) REPLACE is a no go. It causes way too much disc I/O and worse yet totally screws up the on disk data structures because of the deleting.
Comment created by @beberlei:
Scheduled for 2.2
Evaluating this makes me sad, except MySQL support for this is rather non-existant, and the oracle merge is aiming at batch operations.
Should this be done with
I am leaning towards 1.
Comment created by @guilhermeblanco:
Updating fix version