MyBatis level cache and level two cache

MyBatis level Cache

The MyBatis cache is on by default and the cache at session level is cached, and the first level cache is emptied when the following actions are performed

1. Implementation of Session.clearcache ();

2. Perform CUD operations

3.session.close (); It's not the same session object.

MyBatis Level Two cache

Need to configure <cache></cache>

is a map file-level cache

Object entity classes queried when using MyBatis level two cache must be serialized for implementation (Implementation of Serializable interface)

The second-level cache must use Session.commit (), that is, after committing the transaction, the level two cache is triggered

Use a level two cache to use two session queries that will only be sent once in the query SQL

MyBatis level cache and level two cache