Shulou(Shulou.com)06/01 Report--

Configuration configuration = new Configuration ()

Create an object that loads the configuration file

Configuration.configure ()

1. Load configuration file hibernate.cfg.xml

2.hibernate.cfg.xml

1. Information describing the links to the database

2. Load the mapping file * .hbm.xml

SessionFactory = configuration.buildSessionFactory ()

1. Hibernate integrates the link information of the database, the information of the mapping file and the information of the persistence class.

2. SessionFactory is generated by singleton mode.

3. In general, a hibernate should have a database link

4. The class itself is thread-safe

SessionFactory.openSession ()

Opened a link to the database, ready to operate the database

1. Query

2.CUD operation

Open a transaction

Session.beginTransaction ()

Perform the operation of cud

Note:

1. Whether a class is persistent

1. Load the configuration file

2. Load the mapping file in the configuration file

3. Parse the name attribute of the class element in the mapping file and find the corresponding class

2. The class of the parameters on the client must be a persistent class

3. Use the session.get method to generate an object that calls the default constructor, so there must be a default constructor in a persistent class

4. In hibernate, this is not allowed: two persistent objects, but the value of the identifier is the same

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