Hibernate入门二

  学习一对多的关联关系映射并操作　　

一：关系表达

　　1.表中的表达

　　

　　2.实体中的表达

　　　　

二：导包

三：创建实体类

package cn.itcast.domain;

import java.util.Set;

/**
* @author 作者
* @version 创建时间：2018年7月19日 下午3:38:12
* 类说明:
*/
public class Customer {
    private Long cust_id;
    private String cust_name;
    private String cust_source;
    private String cust_industry;
    private String cust_level;
    private String cust_phone;
    private String cust_mobile;
    private Set<LinkMan> linkmens;
    public Set<LinkMan> getLinkmens() {
        return linkmens;
    }
    public void setLinkmens(Set<LinkMan> linkmens) {
        this.linkmens = linkmens;
    }
    public Long getCust_id() {
        return cust_id;
    }
    public void setCust_id(Long cust_id) {
        this.cust_id = cust_id;
    }
    public String getCust_name() {
        return cust_name;
    }
    public void setCust_name(String cust_name) {
        this.cust_name = cust_name;
    }
    public String getCust_source() {
        return cust_source;
    }
    public void setCust_source(String cust_source) {
        this.cust_source = cust_source;
    }
    public String getCust_industry() {
        return cust_industry;
    }
    public void setCust_industry(String cust_industry) {
        this.cust_industry = cust_industry;
    }
    public String getCust_level() {
        return cust_level;
    }
    public void setCust_level(String cust_level) {
        this.cust_level = cust_level;
    }
    public String getCust_phone() {
        return cust_phone;
    }
    public void setCust_phone(String cust_phone) {
        this.cust_phone = cust_phone;
    }
    public String getCust_mobile() {
        return cust_mobile;
    }
    public void setCust_mobile(String cust_mobile) {
        this.cust_mobile = cust_mobile;
    }
    @Override
    public String toString() {
        return "Customer [cust_id=" + cust_id + ", cust_name=" + cust_name + ", cust_source=" + cust_source
                + ", cust_industry=" + cust_industry + ", cust_level=" + cust_level + ", cust_phone=" + cust_phone
                + ", cust_mobile=" + cust_mobile + "]";
    }
    
}

package cn.itcast.domain;
/**
* @author 作者
* @version 创建时间：2018年7月20日 下午3:38:58
* 类说明:
*/
public class LinkMan {
/*
 * CREATE TABLE `cst_linkman` (
  `lkm_id` bigint(32) NOT NULL AUTO_INCREMENT COMMENT '联系人编号(主键)',
  `lkm_name` varchar(16) DEFAULT NULL COMMENT '联系人姓名',
  `lkm_cust_id` bigint(32) NOT NULL COMMENT '客户id',
  `lkm_gender` char(1) DEFAULT NULL COMMENT '联系人性别',
  `lkm_phone` varchar(16) DEFAULT NULL COMMENT '联系人办公电话',
  `lkm_mobile` varchar(16) DEFAULT NULL COMMENT '联系人手机',
  `lkm_email` varchar(64) DEFAULT NULL COMMENT '联系人邮箱',
  `lkm_qq` varchar(16) DEFAULT NULL COMMENT '联系人qq',
  `lkm_position` varchar(16) DEFAULT NULL COMMENT '联系人职位',
  `lkm_memo` varchar(512) DEFAULT NULL COMMENT '联系人备注',
  PRIMARY KEY (`lkm_id`),
  KEY `FK_cst_linkman_lkm_cust_id` (`lkm_cust_id`),
  CONSTRAINT `FK_cst_linkman_lkm_cust_id` FOREIGN KEY (`lkm_cust_id`) REFERENCES `cst_customer` (`cust_id`) ON DELETE NO ACTION ON UPDATE NO ACTION
) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=utf8;

 */
    private Long lkm_id;
    private Character lkm_gender;
    
    private String lkm_name;
    private String lkm_phone;
    private String lkm_mobile;
    private String lkm_email;
    private String lkm_qq;
    private String lkm_position;
    private String lkm_memo;
    
    private Customer customer;

    public Long getLkm_id() {
        return lkm_id;
    }

    public void setLkm_id(Long lkm_id) {
        this.lkm_id = lkm_id;
    }

    public Character getLkm_gender() {
        return lkm_gender;
    }

    public void setLkm_gender(Character lkm_gender) {
        this.lkm_gender = lkm_gender;
    }

    public String getLkm_name() {
        return lkm_name;
    }

    public void setLkm_name(String lkm_name) {
        this.lkm_name = lkm_name;
    }

    public String getLkm_phone() {
        return lkm_phone;
    }

    public void setLkm_phone(String lkm_phone) {
        this.lkm_phone = lkm_phone;
    }

    public String getLkm_mobile() {
        return lkm_mobile;
    }

    public void setLkm_mobile(String lkm_mobile) {
        this.lkm_mobile = lkm_mobile;
    }

    public String getLkm_email() {
        return lkm_email;
    }

    public void setLkm_email(String lkm_email) {
        this.lkm_email = lkm_email;
    }

    public String getLkm_qq() {
        return lkm_qq;
    }

    public void setLkm_qq(String lkm_qq) {
        this.lkm_qq = lkm_qq;
    }

    public String getLkm_position() {
        return lkm_position;
    }

    public void setLkm_position(String lkm_position) {
        this.lkm_position = lkm_position;
    }

    public String getLkm_memo() {
        return lkm_memo;
    }

    public void setLkm_memo(String lkm_memo) {
        this.lkm_memo = lkm_memo;
    }

    public Customer getCustomer() {
        return customer;
    }

    public void setCustomer(Customer customer) {
        this.customer = customer;
    }
    
}

四：编写配置文件

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC 
    "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
    "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="cn.itcast.domain">
    <class name = "LinkMan" table = "cst_linkman">
    <id name = "lkm_id">
        <generator class="native"></generator>
    </id>
    <property name="lkm_gender" column="lkm_gender"></property>
    <property name="lkm_name" column="lkm_name"></property>
    <property name="lkm_phone" column="lkm_phone"></property>
    <property name="lkm_mobile" column="lkm_mobile"></property>
    <property name="lkm_email" column="lkm_email"></property>
    <property name="lkm_qq" column="lkm_qq"></property>
    <property name="lkm_position" column="lkm_position"></property>
    <property name="lkm_memo" column="lkm_memo"></property>
    <!-- name:引用属性名 column:外键列名 class:与我关联的完整类名
     -->
    <many-to-one name="customer" column="lkm_cust_id" class="Customer">
    </many-to-one>
    </class>
</hibernate-mapping>

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC 
    "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
    "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="cn.itcast.domain">
    <class name = "Customer" table = "cst_customer">
    <id name = "cust_id">
        <generator class="native"></generator>
    </id>
    <property name="cust_name" column="cust_name"></property>
    <property name="cust_source" column="cust_source"></property>
    <property name="cust_industry" column="cust_industry"></property>
    <property name="cust_level" column="cust_level"></property>
    <property name="cust_phone" column="cust_phone"></property>
    <property name="cust_mobile" column="cust_mobile"></property>
    
    <!-- 指定实体中集合属性名 -->
    <set name="linkmens">
        <!-- 指定外键的列名 -->
        <key column="lkm_cust_id"></key>
        <!-- 明确关系是一对多  Class指定当前配置文件的类与哪个类是一对多-->
        <one-to-many class="LinkMan"/>
    </set>
    </class>
</hibernate-mapping>

<?xml version="1.0" encoding="UTF-8"?>
<!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>
         <!-- 数据库驱动 -->
        <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
         <!-- 数据库url -->
        <property name="hibernate.connection.url">jdbc:mysql:///crm_hibernate</property>
         <!-- 数据库连接用户名 -->
        <property name="hibernate.connection.username">root</property>
         <!-- 数据库连接密码 -->
        <property name="hibernate.connection.password">root</property>
        <!-- 数据库方言
            不同的数据库中,sql语法略有区别. 指定方言可以让hibernate框架在生成sql语句时.针对数据库的方言生成.
            sql99标准: DDL 定义语言  库表的增删改查
                      DCL 控制语言  事务 权限
                      DML 操纵语言  增删改查
            注意: MYSQL在选择方言时,请选择最短的方言.
         -->
        <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
        
        
        <!-- #hibernate.show_sql true 
             #hibernate.format_sql true
        -->
        <!-- 将hibernate生成的sql语句打印到控制台 -->
        <property name="hibernate.show_sql">true</property>
        <!-- 将hibernate生成的sql语句格式化(语法缩进) -->
        <property name="hibernate.format_sql">true</property>
        <!-- 
        ## auto schema export  自动导出表结构. 自动建表
        #hibernate.hbm2ddl.auto create        自动建表.每次框架运行都会创建新的表.以前表将会被覆盖,表数据会丢失.(开发环境中测试使用)
        #hibernate.hbm2ddl.auto create-drop 自动建表.每次框架运行结束都会将所有表删除.(开发环境中测试使用)
        #hibernate.hbm2ddl.auto update(推荐使用) 自动生成表.如果已经存在不会再生成.如果表有变动.自动更新表(不会删除任何数据).
        #hibernate.hbm2ddl.auto validate    校验.不自动生成表.每次启动会校验数据库中表是否正确.校验失败.
         -->
        <property name="hibernate.hbm2ddl.auto">update</property>
        <!-- 引入orm元数据
            路径书写: 填写src下的路径
         -->
        <mapping resource="cn/itcast/domain/Customer.hbm.xml" />
        <mapping resource="cn/itcast/domain/LinkMan.hbm.xml" />
    </session-factory>
</hibernate-configuration>

五：编写测试类

package cn.itcast.one2many;

import org.hibernate.Session;
import org.hibernate.Transaction;
import org.junit.Test;

import cn.itcast.domain.Customer;
import cn.itcast.domain.LinkMan;
import cn.itcast.utils.HibernateUtils;

/**
* @author 作者
* @version 创建时间：2018年7月20日 下午4:28:54
* 类说明:
*/
public class TestRelationMap {
    @Test
    public void fun1() {
        //1.获取session
        Session session = HibernateUtils.openSession();
        //2.开启事务
        Transaction tx = session.beginTransaction();
        //3.操作
        Customer customer = new Customer();
        LinkMan linkman1 = new LinkMan();
        LinkMan linkman2 = new LinkMan();
        customer.setCust_name("XX公司");
        linkman1.setLkm_name("张三");
        linkman1.setLkm_name("李四");
        
        customer.getLinkmens().add(linkman1);
        customer.getLinkmens().add(linkman2);
        linkman1.setCustomer(customer);
        linkman2.setCustomer(customer);
        
        session.save(customer);
        session.save(linkman1);
        session.save(linkman2);
        //4.提交事务 关闭资源
        tx.commit();
        session.close();
    }
}