14、Java Persistence: Flush Modes, Entity Mapping, and Primary Keys

Java Persistence: Flush Modes, Entity Mapping, and Primary Keys

1. Flush Mode Types

In Java Persistence, you can control and change the default flush behavior using the javax.persistence.FlushModeType enumeration. It has two values:
- AUTO : This is the default behavior. When performing a query, any updates made within the transaction are flushed to ensure the query reflects these changes.
- COMMIT : Changes are flushed only when the transaction commits, not before any query.

You can set the FlushModeType by calling the setFlushMode() method on the EntityManager .

The default AUTO flush behavior makes sense because it ensures tha