映射 Map（基本数据类型）(参考张龙老师的)

1.Team.java

package org.yang.hibernate;

import java.util.HashMap;
import java.util.Map;

public class Team
{
private String id;
private String teamName;
private Map<String,String> students = new HashMap<String,String>();
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getTeamName() {
return teamName;
}
public void setTeamName(String teamName) {
this.teamName = teamName;
}
public Map<String,String> getStudents() {
return students;
}
public void setStudents(Map<String,String> students) {
this.students = students;
}


}

2.Team.hbm.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd" >
<hibernate-mapping>
<class name="org.yang.hibernate.Team" table="team">
<id name="id" column="id" type="string">
<generator class="uuid"></generator>
</id>

<property name="teamName" type="string">
<column name="teamname" length="13"></column>
</property>

<map name="students" table="student">
<key column="team_id"></key>
<!-- 这里的index存放的是KEY -->
<index column="name" type="java.lang.String"></index>
<!-- 这里的element存入的是VALUE -->
<element column="description" type="java.lang.String"></element>
</map>

</class>
</hibernate-mapping>

3.CreateTable.java

package org.yang.hibernate;

import org.hibernate.cfg.Configuration;
import org.hibernate.tool.hbm2ddl.SchemaExport;

public class CreateTable
{
public static void main(String[] args)
{
SchemaExport export = new SchemaExport(new Configuration().configure());
export.create(true,true);
}
}

4. hibernate.cfg.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd" >
<hibernate-configuration>
<session-factory>
<property name="connection.driver_class">org.postgresql.Driver</property>
<property name="connection.url">jdbc:postgresql://localhost:5432/myhibernate</property>
<property name="hibernate.connection.username">postgres</property>
<property name="hibernate.connection.password">yang</property>
<property name="hibernate.dialect">org.hibernate.dialect.PostgreSQLDialect</property>
<property name="current_session_context_class">thread</property>
<property name="show_sql">true</property>
<property name="format_sql">true</property>

<mapping resource="Team.hbm.xml" />
</session-factory>
</hibernate-configuration>


5.Test.java

package org.yang.hibernate;

import java.util.Map;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;

public class Test
{
private static SessionFactory sessionFactory;
static
{
try
{
sessionFactory = new Configuration().configure().buildSessionFactory();
}
catch(Exception ex)
{
ex.printStackTrace();
}
}

public static void main(String[] args)
{
Session session = sessionFactory.openSession();
Transaction tx = null;
try
{
tx = session.beginTransaction();
Team team = new Team();
team.setTeamName("team1");

Map<String,String> map = team.getStudents();
map.put("zhanggsan","helloworld");
map.put("lisi","welcome");

session.save(team);
tx.commit();
}
catch(Exception ex)
{
if (null != tx)
{
tx.rollback();
}

ex.printStackTrace();
}
finally
{
session.close();
}

}

}

（编辑：李大同）

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