Java/Hibernate/Save

Simple Save Demo

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import org.hibernate.Session;
import util.ConnectionUtil;
import util.HibernateUtil;
public class Main {
  static Session session;
  public static void main(String[] args) {
    open();
    Keyword k = new Keyword();
    session.save(k);
    session.flush();
    
    close();
  }
  
  private static void open() {
    ConnectionUtil.openConnection();
    ConnectionUtil.update("CREATE TABLE KEYWORDS ( ID int, NAME VARCHAR(25) )");
    session = HibernateUtil.currentSession();
  }
  private static void close() {
    ConnectionUtil.closeConnection();
    HibernateUtil.closeSession();
    HibernateUtil.sessionFactory.close();
  }
}
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<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
          "-//Hibernate/Hibernate Mapping DTD 2.0//EN"
          "http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd">
<hibernate-mapping>
  <!-- table created by: CREATE TABLE KEYWORDS ( ID IDENTITY, NAME VARCHAR(25) ); -->
  <class name="Keyword" table="keywords">
        
    <id name="id" column="id" unsaved-value="null">
      <generator class="increment"/>
    </id>
        
    <property name="name" 
              column="NAME" 
              not-null="true" 
              unique="true"
              />
  </class>
</hibernate-mapping> 
<!-- $Id: Keyword.hbm.xml,v 1.3 2003/07/08 19:18:30 dwight Exp $ -->

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public class Keyword {
    protected Integer    id_;
    protected String name_ ="aaa";
    public Keyword() {
    }
    public Integer getId() {
        return id_;
    }
    public void setId(Integer newId) {
        this.id_ = newId;
    }
    public String getName() {
        return name_;
    }
    public void setName(String newName) {
        this.name_ = newName;
    }
}

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<!DOCTYPE hibernate-configuration PUBLIC
  "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
  "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
  <session-factory>
     <!-- Database connection settings -->
        <property name="connection.driver_class">org.hsqldb.jdbcDriver</property>
        <property name="connection.url">jdbc:hsqldb:mem:testdb</property>
        <property name="connection.username">sa</property>
        <property name="connection.password"></property>
        <!-- JDBC connection pool (use the built-in) -->
        <property name="connection.pool_size">2</property>
        <!-- SQL dialect -->
        <property name="dialect">org.hibernate.dialect.HSQLDialect</property>
        <!-- Echo all executed SQL to stdout -->
        <property name="show_sql">true</property>
        <!-- Drop and re-create the database schema on startup 
        <property name="hbm2ddl.auto">create</property>-->
        <mapping resource="Keyword.hbm.xml"/>
  </session-factory>
</hibernate-configuration>

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