Sunday, December 28, 2014

Different ways to get the Connection object using Hibernate

Getting the java.sql.Connection object using Session:
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org.hibernate.Session is nothing but get the one physical connection from the database. 

By using Session we can get the Connection object several ways.

1) session.connection() - this method is deprecated. it is not available on Hibernate4.

2) session.doWork() - this method doesn't return Connection object, but inside what ever operation we want to do using connection object we can do. 

3) session.doReturningWork() - this method returns dynamic type value. In the below example i am return Connection object. 

4) SessionImpl.connection() - Down casting the Session object to SessionImpl. By using SessionImpl we will get the Connection object.

5) ConnectionProvider.getConnection() - Using ConnectionProvider getConnection() method.


Full Example:

package com.varasofttech.client;

import java.sql.Connection;
import java.sql.SQLException;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.engine.jdbc.connections.spi.ConnectionProvider;
import org.hibernate.engine.spi.SessionFactoryImplementor;
import org.hibernate.internal.SessionImpl;
import org.hibernate.jdbc.ReturningWork;
import org.hibernate.jdbc.Work;

import com.varasofttech.util.HibernateUtil;

public class Application {

public static void main(String[] args) {

// Different ways to get the Connection object using Session

SessionFactory sessionFactory = HibernateUtil.getSessionFactory();
Session session = sessionFactory.openSession();

// Way1 - using doWork method
session.doWork(new Work() {
@Override
public void execute(Connection connection) throws SQLException {
// do your work using connection
}

});

// Way2 - using doReturningWork method
Connection connection = session.doReturningWork(new ReturningWork<Connection>() {
@Override
public Connection execute(Connection conn) throws SQLException {
return conn;
}
});

// Way3 - using Session Impl
SessionImpl sessionImpl = (SessionImpl) session;
connection = sessionImpl.connection();
// do your work using connection

// Way4 - using connection provider
SessionFactoryImplementor sessionFactoryImplementation = (SessionFactoryImplementor) session.getSessionFactory();
ConnectionProvider connectionProvider = sessionFactoryImplementation.getConnectionProvider();
try {
connection = connectionProvider.getConnection();
// do your work using connection
} catch (SQLException e) {
e.printStackTrace();
}
}
}


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