Hibernate 一对多双向映射 代码

在下多于一对一还好控制，对于一对多和多对多方面配置经常出错，作个代码备份,代码地址：http://www.itneng.com/thread-3693-1-1.html

标签：Hibernate

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importjava.io.Serializable;

importjava.util.*;

 

importorg.hibernate.*;

importorg.hibernate.cfg.*;

importorg.hibernate.criterion.*;

importorg.hibernate.event.*;

importorg.hibernate.event.def.*;

 

publicclass Main {

   publicstatic void main(String[] args) throwsException {

      HibernateUtil.setup("create table grouptable (id int,name varchar);");   

      HibernateUtil.setup("create table story (id int,info varchar,idx int,parent_id int);");   

 

      Session session = HibernateUtil.currentSession();

 

      Group sp = newGroup("Group Name");

 

 

      HashSet set = newHashSet();

      Story s = newStory("A Story");

      s.setParent(sp);

      set.add(s);

      sp.setStories(set);

 

      Transaction transaction = null;

 

      try{

           transaction = session.beginTransaction();

           session.save(sp);

           transaction.commit();

      }catch(Exception e) {

           if(transaction != null) {

             transaction.rollback();

             throwe;

           }

      } finally{

           session.close();

      }

      HibernateUtil.checkData("select * from grouptable");

      HibernateUtil.checkData("select * from story");     

   }

}

 

 

 

 

/////////////////////////////////////////////////////////////////////////

 

importjava.util.*;

 

publicclass Group {

  privateint id;

  privateString name;

  privateSet stories;

 

  publicGroup(){

  }

 

  publicGroup(String name) {

    this.name = name;

  }

 

  publicvoid setId(inti) {

    id = i;

  }

 

  publicint getId() {

    returnid;

  }

 

  publicvoid setName(String n) {

    name = n;

  }

 

  publicString getName() {

    returnname;

  }

 

  publicvoid setStories(Set l) {

    stories = l;

  }

 

  publicSet getStories() {

    returnstories;

  }

}

 

 

 

/////////////////////////////////////////////////////////////////////////

importjava.util.*;

 

publicclass Story {

  privateint id;

  privateString info;

  privateGroup parent;

 

  publicvoid setParent(Group g) {

    parent = g;

  }

  publicGroup getParent() {

    returnparent;

  }

  publicStory(){

  }

 

  publicStory(String info) {

    this.info = info;

  }

 

  publicvoid setId(inti) {

    id = i;

  }

 

  publicint getId() {

    returnid;

  }

 

  publicvoid setInfo(String n) {

    info = n;

  }

 

  publicString getInfo() {

    returninfo;

  }

}

 

 

 

/////////////////////////////////////////////////////////////////////////

 

 

<?xml version="1.0"encoding="UTF-8"?>

<!DOCTYPE hibernate-mapping

    PUBLIC"-//Hibernate/Hibernate Mapping DTD//EN"

    "http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd">

 

<hibernate-mapping>

    <classname="Group"table="grouptable">

        <id name="id"unsaved-value="0">

             <generatorclass="increment"/>

        </id>

 

        <set name="stories"cascade="all"inverse="true">

             <key column="parent_id"/>

             <one-to-manyclass="Story"/>

        </set>

        <property name="name"type="string"/>

    </class>

 

    <classname="Story"table="story">

        <id name="id"unsaved-value="0">

             <generatorclass="increment"/>

        </id>

        <property name="info"/>

        <many-to-one name="parent"column="parent_id"not-null="true"/>

    </class>

</hibernate-mapping>

 

 

/////////////////////////////////////////////////////////////////////////

<?xml version='1.0'encoding='utf-8'?>

<!DOCTYPE hibernate-configuration PUBLIC

    "-//Hibernate/Hibernate Configuration DTD//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:data/tutorial</property>

        <property name="connection.username">sa</property>

        <property name="connection.password"></property>

 

        <!-- JDBC connection pool (use the built-in) -->

        <property name="connection.pool_size">1</property>

 

        <!-- SQL dialect -->

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

 

        <!-- Echo all executed SQL to stdout -->

        <property name="show_sql">true</property>

 

        <!-- Mapping files -->

        <mapping resource="Group.hbm.xml"/>

    </session-factory>

</hibernate-configuration>

 

 

 

/////////////////////////////////////////////////////////////////////////

importjava.sql.Connection;

importjava.sql.DriverManager;

importjava.sql.Statement;

 

importjava.sql.ResultSet;

importjava.sql.ResultSetMetaData;

 

importorg.hibernate.HibernateException;

importorg.hibernate.Session;

importorg.hibernate.SessionFactory;

importorg.hibernate.cfg.Configuration;

 

publicclass HibernateUtil {

 

    publicstatic final SessionFactory sessionFactory;

 

    static{

        try{

            // Create the SessionFactory from hibernate.cfg.xml

            sessionFactory = newConfiguration().configure().buildSessionFactory();

        }catch(Throwable ex) {

            // Make sure you log the exception, as it might be swallowed

            System.err.println("Initial SessionFactory creation failed." + ex);

            thrownew ExceptionInInitializerError(ex);

        }

    }

 

    publicstatic final ThreadLocal session = newThreadLocal();

 

    publicstatic Session currentSession() throwsHibernateException {

        Session s = (Session) session.get();

        // 如果本来没有，打开一个新的Session

        if(s == null) {

            s = sessionFactory.openSession();

            // 保存

            session.set(s);

        }

        returns;

    }

 

    publicstatic void closeSession() throwsHibernateException {

        Session s = (Session) session.get();

        if(s != null)

            s.close();

        session.set(null);

    }

 

    staticConnection conn;

    staticStatement st;

  publicstatic void setup(String sql) {

    try{

      // 加载 JDBC 驱动.

      Class.forName("org.hsqldb.jdbcDriver");

      System.out.println("Driver Loaded.");

      //建立到数据库的连接

      String url = "jdbc:hsqldb:data/tutorial";

 

      conn = DriverManager.getConnection(url, "sa","");

      System.out.println("Got Connection.");

 

      st = conn.createStatement();

      st.executeUpdate(sql);

    }catch(Exception e) {

      System.err.println("Got an exception! ");

      e.printStackTrace();

      System.exit(0);

    }

  }

  publicstatic void checkData(String sql) {

    try{

      HibernateUtil.outputResultSet(st

          .executeQuery(sql));

//      conn.close();

    }catch(Exception e) {

      e.printStackTrace();

    }

  }

 

    publicstatic void outputResultSet(ResultSet rs) throwsException{

    ResultSetMetaData metadata = rs.getMetaData();

 

    intnumcols = metadata.getColumnCount();

    String[] labels = newString[numcols];

    int[] colwidths = newint[numcols];

    int[] colpos = newint[numcols];

    intlinewidth;

 

      for(inti = 0; i < numcols; i++) {

        labels[i] = metadata.getColumnLabel(i + 1);

        System.out.print(labels[i]+"  ");

    }

      System.out.println("------------------------");

 

    while(rs.next()) {

        for(inti = 0; i < numcols; i++) {

        Object value = rs.getObject(i + 1);

        if(value == null){

            System.out.print("       ");

        }else{

            System.out.print(value.toString().trim()+"   ");

        }

 

      }

        System.out.println("       ");

    }

    }

}