休眠多个数据库

Question

I need to use hibernate with 2 or more bases. Since these bases have the same table, I imagine that there will be no problem when using the same objects paras tables that repeat. So being, I wonder how to spend other files on HibernateUtil establishing the connection, using different files hibernate.cfg.xml, but with the same mapping properties.

I imagine it's something along these lines:

   sessionFactory = new AnnotationConfiguration().configure().buildSessionFactory();

but i dont have idea how to configure a other file.

Answer 1

The thing is to have 2 different session factory providers, each one configured with its corresponding data base.

In the example below HibernateUtilDb1 will use the configuration in hibernate-db1.cfg.xml , and HibernateUtilDb2 will use hibernate-db2.cfg.xml .

public class HibernateUtilDb1 {

    private static final SessionFactory sessionFactory = buildSessionFactory();

    private static SessionFactory buildSessionFactory() {
        try {
            return new Configuration().configure("hibernate-db1.cfg.xml").buildSessionFactory();
        }
        catch (Throwable ex) { ...}
    }
...

And:

public class HibernateUtilDb2 {

    private static final SessionFactory sessionFactory = buildSessionFactory();

    private static SessionFactory buildSessionFactory() {
        try {
            return new Configuration().configure("hibernate-db2.cfg.xml").buildSessionFactory();
        }
        catch (Throwable ex) { ...}
    }
...