To verify the existence of a cache in hibernate using the Process method

Write a small example of an enquiry

Test the existence of a first-level cache    @Test public    void Demo8 () {        Session session = Hibernateutils.opensession ();        Transaction Transaction = Session.begintransaction ();                                                                                             Book book = (book) Session.get (Book.class, "2c2882bc42f1e93b0142f1e93d2c0000");        SYSTEM.OUT.PRINTLN (book);        System.out.println ("========================================================");        Execute the same query again-directly using the data in the first-level cache        Book1 = (book) Session.get (Book.class, "2c2882bc42f1e93b0142f1e93d2c0000");        System.out.println (BOOK1);                                                                                             Transaction.commit ();        Session.close ();    }

　　

Look at log.

14:43:04,171  Info tablemetadata:66-columns: [first_name, last_name]14:43:04,171  info tablemetadata:68- Foreign keys: []14:43:04,181  info tablemetadata:69-indexes: [primary]14:43:04,181  Info schemaupdate:217- Schema update completehibernate:    select        book0_.id as id1_0_,        book0_.name as name1_0_,        Book0_.price as price1_0_    from        hbm3.tbl_book book0_    where        book0_.id=? Book [id=2c2882bc42f1e93b0142f1e93d2c0000, Name=hibernate Primer Classic, price=23.0]======================================= =================book [id=2c2882bc42f1e93b0142f1e93d2c0000, Name=hibernate Introduction Classic, price=23.0]

For the first time, the SQL sentence was printed, and the second time there was no SQL language.

Say: The second time you haven't read the numbers from the DB, where did you get the numbers? is a level of cache, the first time to check the results of the inquiry has been put into a level of the second buffer to take out directly.

To verify the existence of a cache in hibernate using the Process method