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Jul 9 2010

MySQL Duplicate Function

Sometimes you want the ability to duplicate (clone) entities in mySQL. But duplicating their children can be a huge pain! Here’s how:

/* parent table */
insert into [parent table]
select 0, [field1, field2, field3] from [tablename] where [parent table primary key] = [parent table object ID]

/* child table */
insert into [child table]
select 0, [field1, field2, field3], (select max([parent table primary key]) from [parent table]) from [child table] where [parent table primary key] = [parent table object ID]

important note! make sure that you don’t select the primary key of the table. instead, select 0, and the auto_increment function will automatically figure out the correct primary key

As always, if you have questions, post em in the comments!