Hibernate笔记：JAR包导入，常用API,多对一配置

JAR包导入

hibernate3.jar
\lib\required*.jar
\lib\jpa*.jar
数据库驱动包：mysql-connector-java-5.1.32-bin.jar

完整多对一配置详解代码

项目结构

代码

Father.java

package com.ning.dao;import java.io.Serializable;/** * Father 实体类 * private int id; * private String name; * private String age; * @author wangn * */public class Father implements Serializable{    private int id;    private String name;    private String age;    public int getId() {        return id;    }    public void setId(int id) {        this.id = id;    }    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    public String getAge() {        return age;    }    public void setAge(String age) {        this.age = age;    }}

Son.java

package com.ning.dao;import java.io.Serializable;/** * Son 实体类 * private int sid; * private String name; * private Father father; * @author wangn * */public class Son implements Serializable{    private int sid;    private String name;    private Father father;    public int getSid() {        return sid;    }    public void setSid(int sid) {        this.sid = sid;    }    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    public Father getFather() {        return father;    }    public void setFather(Father father) {        this.father = father;    }}

Father.hbm.xml

<?xml version="1.0"?><!DOCTYPE hibernate-mapping PUBLIC     "-//Hibernate/Hibernate Mapping DTD 3.0//EN"    "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd"><hibernate-mapping package="com.ning.dao">    <class name="Father" table="father">        <!-- 主键 ，映射-->        <id name="id" column="id" type="integer">            <generator class="native"/>        </id>        <!-- 非主键，映射 -->        <property name="name" column="name" type="string"></property>        <property name="age" column="age" type="string"></property>    </class></hibernate-mapping>

Son.hbm.xml

<?xml version="1.0"?><!DOCTYPE hibernate-mapping PUBLIC     "-//Hibernate/Hibernate Mapping DTD 3.0//EN"    "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd"><hibernate-mapping package="com.ning.dao">    <class name="Son" table="son">        <!-- 主键 ，映射-->        <id name="sid" column="sid" type="integer">            <generator class="native"/>        </id>        <!-- 非主键，映射 -->        <property name="name" column="name" type="string"></property>        <!-- 多对一 -->        <many-to-one name="father" column="ids" class="Father"></many-to-one>    </class></hibernate-mapping>

hibernate.cfg.xml

<!DOCTYPE hibernate-configuration PUBLIC    "-//Hibernate/Hibernate Configuration DTD 3.0//EN"    "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd"><hibernate-configuration>    <session-factory name="">        <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>        <property name="hibernate.connection.url">jdbc:mysql:///ning</property>        <property name="hibernate.connection.username">root</property>        <property name="hibernate.connection.password">root</property>        <!-- 数据库方言 -->        <property name="hibernate.dialect">org.hibernate.dialect.MySQL5Dialect</property>        <!-- 控制台打印SQL语句 -->        <property name="hibernate.show_sql">true</property>        <!-- <property name="hibernate.format_sql">true</property> -->        <property name="hibernate.hbm2ddl.auto">update</property>        <mapping resource="com/ning/dao/Son.hbm.xml"/>        <mapping resource="com/ning/dao/Father.hbm.xml"/>    </session-factory></hibernate-configuration>

Test1.java

package com.ning.test;import org.hibernate.Session;import org.hibernate.SessionFactory;import org.hibernate.Transaction;import org.hibernate.cfg.Configuration;import com.ning.dao.Father;import com.ning.dao.Son;public class Test1 {    public static void main(String[] args) {        // 获取加载配置文件的管理类对象        Configuration config = new Configuration();        config.configure();  // 默认加载src/hibenrate.cfg.xml文件        // 创建session的工厂对象        SessionFactory sf = config.buildSessionFactory();        // 创建session (代表一个会话，与数据库连接的会话)        Session session = sf.openSession();        // 开启事务        Transaction tx = session.beginTransaction();        Father father =new Father();        Son son1 = new Son();        Son son2 = new Son();        father.setName("父亲1");        father.setAge("40");        son1.setName("儿子1");        son1.setFather(father);        son2.setName("儿子2");        son2.setFather(father);        session.save(father);        session.save(son1);        session.save(son2);        // 提交事务        tx.commit();        // 关闭        session.close();        sf.close();    }}

数据库结果

查询结果

    Son son = (Son) session.get(Son.class, 1);    System.out.println(son.getSid());    System.out.println(son.getName());    System.out.println(son.getFather().getName());//懒加载

控制台打印结果：Hibernate: select son0_.sid as sid0_0_, son0_.name as name0_0_, son0_.ids as ids0_0_ from son son0_ where son0_.sid=?1儿子1Hibernate: select father0_.id as id1_0_, father0_.name as name1_0_, father0_.age as age1_0_ from father father0_ where father0_.id=?父亲1