使用休眠在运行时为derby数据库设置bootPassword

Question

I use Hibernate and Derby.

I have a hibernate.cfg.xml and all I did for working with db waas to get a Session :

  return new AnnotationConfiguration().configure( "files/hibernate.cfg.xml"   ).buildSessionFactory().getCurrentSession();

my hibernate.cfg.xml containes

   <property name="connection.driver_class">org.apache.derby.jdbc.EmbeddedDriver</property>
   <property name="connection.url">jdbc:derby:crmdb;create=true</property>

and some other properties and mappings for entity classes.

now I want to set dataEncryption for derby db and bootPassword at runtime.

I changed hibernate.cfg.xml :

    <property name="connection.url">jdbc:derby:crmdb;create=true;dataEncryption=true;bootPassword=myPass</property>

and everything was ok.

Now I want to set bootPassword at runtime, exby reading from an environment variable. that´s the problem! when I delete "connection.url" from hibernate.cfg.xml and trying to set it inside my code, this error ocurres :

 java.lang.UnsupportedOperationException: The application must supply JDBC connections

and if I delete only bootPassword, it can not connect to db.

any idea ?

Answer 1

It resolved !

I should set "hibernate.connection.url" instead of "connection.url" !

Answer 2

You need to modify the configuration before building the sessionFactory:

private SessionFactory sessionFactory;

public SessionFactory getSessionFactory(){
    if(sessionFactory==null){
        Configuration configuration = new AnnotationConfiguration().configure( "files/hibernate.cfg.xml"   );
        configuration.setProperty("hibernate.connection.url", "jdbc:derby:crmdb;create=true;dataEncryption=true;bootPassword="+password);
        configuration.configure();
        sessionFactory = configuration.buildSessionFactory();
    }
    return sessionFactory;
}

Other remark : you must avoid to recreate a new SessionFactory everytime (it take a lot of time, consume lot of resources and it's useless). ie You must create one sessionFactory for each bootPassword (since it's the only dynamic part) and if you only have one bootPassword - ie one single DB - then your sessionFactory can/must be a singleton.

ref