Question

I have a database table ‘MyTable’ that has a trigger upon update of field ‘Status’ in it.

Below is a dummy-code of what i’m trying to do:

MyTable table = new Mytable();
table.setTableId(1);
table.setStatus ("NEW");
em.persist (table); //At this point the trigger did not kick in since this inserted a new record

...

MyTable table2 = em.find(MyTable.class, 1);
table2.setStatus ("NEW"); 
em.merge(table2)//Even though im updating the record with the same status with the same value, i still want the trigger to kick. However the trigger is not being activated.


...

MyTable table3 = em.find(MyTable.class, 1);
table3.setStatus ("OLD"); 
em.merge(table3)//The trigger is being activated here since the status is different the status value when it was inserted the first time.

Long story short, how can i make the changes done to ‘transfer2’ to trigger an update even though the status is the same?

-Thanks

Answer 1

JPA does not update object that have no changes.

You could try changing to something else (flush), then changing it back.

You could also use a JPQL update query to update it.

Depending on your JPA provider you could probably force it to update fields that have not changed, but this would lead to very bad performance.