<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
    "-//Hibernate/Hibernate Configuration DTD//EN"
    "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>

  <session-factory>

    <property name="hibernate.connection.url">jdbc:postgresql://localhost:5432/myDB</property>
    <property name="hibernate.connection.driver_class">org.postgresql.Driver</property>
    <property name="connection.username">postgres</property>
    <property name="connection.password">P@ssw0rd<;/property>
    <property name="hibernate.dialect">org.hibernate.dialect.PostgreSQL9Dialect</property>

    <mapping class="ru.mx.hibdemo.hibernate.dao.WeatherEntity"/>

      <!-- DB schema will be updated if needed -->
    <!-- <property name="hbm2ddl.auto">update</property> -->
  </session-factory>

</hibernate-configuration>

import org.hibernate.SessionFactory;
import org.hibernate.boot.registry.StandardServiceRegistry;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
import org.hibernate.metamodel.MetadataSources;


public class HibernateSessionFactory {

    private static SessionFactory sessionFactory = buildSessionFactory();

    protected static SessionFactory buildSessionFactory()
    {
        // A SessionFactory is set up once for an application!
        final StandardServiceRegistry registry = new StandardServiceRegistryBuilder()
                .configure() // configures settings from hibernate.cfg.xml
                .build();
        try {
                sessionFactory = new MetadataSources( registry ).buildMetadata().buildSessionFactory();
            }
        catch (Exception e) {
            // The registry would be destroyed by the SessionFactory, but we had trouble building the SessionFactory
            // so destroy it manually.
            StandardServiceRegistryBuilder.destroy( registry );
            throw new ExceptionInInitializerError("Initial SessionFactory failed: " + e);
        }
        return sessionFactory;
    }


    public static SessionFactory getSessionFactory() {
        return sessionFactory;
    }

    public static void shutdown() {
        // Close caches and connection pools
        getSessionFactory().close();
    }

}

<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
    "-//Hibernate/Hibernate Configuration DTD//EN"
    "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>

  <session-factory>

    <property name="hibernate.connection.url">jdbc:postgresql://localhost:5432/myDB</property>
    <property name="hibernate.connection.driver_class">org.postgresql.Driver</property>

    <property name="hibernate.c3p0.min_size">5</property>
    <property name="hibernate.c3p0.max_size">20</property>
    <property name="hibernate.c3p0.timeout">1800</property>
    <property name="hibernate.c3p0.max_statements">50</property>

    <property name="hibernate.connection.username">postgres</property>
    <property name="hibernate.connection.password">P@ssw0rd<;/property>
    <property name="hibernate.connection.pool_size">1</property>

    <property name="hibernate.dialect">org.hibernate.dialect.PostgreSQL9Dialect</property>

    <property name="hibernate.current_session_context_class">thread</property>
    <property name="hibernate.hbm2ddl.auto">update</property>

    <mapping class="ru.mx.hibdemo.hibernate.dao.WeatherEntity"/>

      <!-- DB schema will be updated if needed -->
    <!-- <property name="hbm2ddl.auto">update</property> -->
  </session-factory>

</hibernate-configuration>

package ru.mx.hibdemo.hibernate.main;
import org.hibernate.Session;
import ru.mx.hibdemo.hibernate.dao.WeatherEntity;
import ru.mx.hibdemo.hibernate.utils.HibernateSessionFactory;

public class AppMain {
    public static void main(String[] args) {

        System.out.println("Hibernate tutorial");

        Session session = HibernateSessionFactory.getSessionFactory().openSession();

        session.beginTransaction();

        WeatherEntity weatherEntity = new WeatherEntity();

        weatherEntity.setCity("Сарапулка");
        weatherEntity.setPrcp(760);
        weatherEntity.setTempHi(19);
        weatherEntity.setTempLo(0);
        weatherEntity.setDate("23/04/2016");

        session.save(weatherEntity);

        session.getTransaction().commit();

        session.close();

    }
};

select * from weather