配置举例
顾客和联系人的关系 一个顾客可以联系多个联系人 一对多 反过来就是多对一
顾客的实体类
package cn.ycsj.domain;
import java.util.HashSet;
import java.util.Set;
public class Customer {
/*
* CREATE TABLE `cst_customer` (
`cust_id` BIGINT(32) NOT NULL AUTO_INCREMENT COMMENT '客户编号(主键)',
`cust_name` VARCHAR(32) NOT NULL COMMENT '客户名称(公司名称)',
`cust_source` VARCHAR(32) DEFAULT NULL COMMENT '客户信息来源',
`cust_industry` VARCHAR(32) DEFAULT NULL COMMENT '客户所属行业',
`cust_level` VARCHAR(32) DEFAULT NULL COMMENT '客户级别',
`cust_linkman` VARCHAR(64) DEFAULT NULL COMMENT '联系人',
`cust_phone` VARCHAR(64) DEFAULT NULL COMMENT '固定电话',
`cust_mobile` VARCHAR(16) DEFAULT NULL COMMENT '移动电话',
PRIMARY KEY (`cust_id`)
) ENGINE=INNODB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8;
*/
private Integer cust_id;
private String cust_name;
private String cust_source;
private String cust_industry;
private String cust_level;
private String cust_linkman;
private String cust_phone;
private String cust_mobile;
//使用set集合表达一对多关系
private Set<LinkMan> linkMans = new HashSet<LinkMan>();
public Integer getCust_id() {
return cust_id;
}
public void setCust_id(Integer 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_linkman() {
return cust_linkman;
}
public void setCust_linkman(String cust_linkman) {
this.cust_linkman = cust_linkman;
}
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 + "]";
}
public Set<LinkMan> getLinkMans() {
return linkMans;
}
public void setLinkMans(Set<LinkMan> linkMans) {
this.linkMans = linkMans;
}
}
//使用set集合表达一对多关系
private Set<LinkMan> linkMans = new HashSet<LinkMan>();
Custormer.hbm.xml配置文件中的配置
<?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.ycsj.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_linkman" column="cust_linkman" ></property>
<property name="cust_phone" column="cust_phone" ></property>
<property name="cust_mobile" column="cust_mobile" ></property>
<!--将一对多关系在配置文件中体现-->
<!--
name属性 集合属性名
column外键列名
class属性 与我关联的对象完整类名
-->
<set name="linkMans">
<key column="lkm_cust_id"></key>
<one-to-many class="LinkMan"></one-to-many>
</set>
</class>
</hibernate-mapping>
linkman实体类
package cn.ycsj.domain;
public class LinkMan {
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;
//与custormer对象关联
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;
}
}
配置文件linkman.hbm.xml
<?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.ycsj.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>
<!--表达多对
name 对象中的字段 column 表中的字段 class 关联的对象
一-->
<many-to-one name="customer" column="lkm_cust_id" class="Customer"></many-to-one>
</class>
</hibernate-mapping>
主配置文件
hibernate.cfg.xml
<?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>
<!--
#hibernate.dialect org.hibernate.dialect.MySQLDialect
#hibernate.dialect org.hibernate.dialect.MySQLInnoDBDialect
#hibernate.dialect org.hibernate.dialect.MySQLMyISAMDialect
#hibernate.connection.driver_class com.mysql.jdbc.Driver
#hibernate.connection.url jdbc:mysql:///test
#hibernate.connection.username gavin
#hibernate.connection.password
-->
<!-- 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://localhost/hib</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">123456</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.MySQL57Dialect</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>
<!--指定session与当前线程绑定-->
<property name="hibernate.current_session_context_class">thread</property>
<!-- 引入orm元数据
路径书写: 填写src下的路径
-->
<mapping resource="cn/ycsj/domain/Customer.hbm.xml" />
<mapping resource="cn/ycsj/domain/LinkMan.hbm.xml" />
</session-factory>
</hibernate-configuration>
基础测试
package JUNITtet;
import cn.ycsj.domain.Customer;
import cn.ycsj.domain.LinkMan;
import cn.ycsj.utils.HibernateUtils;
import org.hibernate.Session;
import org.hibernate.Transaction;
import org.junit.Test;
public class Otm {
/**
* 保存客户以及客户下的联系人
*/
@Test
public void func(){
//1.获得session
Session session = HibernateUtils.getCurrentSession();
//2.开启事务
Transaction tx = session.beginTransaction();
//3.操作
Customer c = new Customer();
c.setCust_name("zhiduowa");
LinkMan lm1 = new LinkMan();
lm1.setLkm_name("董事长");
LinkMan lm2 = new LinkMan();
lm2.setLkm_name("总经理");
LinkMan lm3 = new LinkMan();
lm3.setLkm_name("人事");
//表达一对多
c.getLinkMans().add(lm1);
c.getLinkMans().add(lm2);
//表达多对一
lm1.setCustomer(c);
lm2.setCustomer(c);
session.save(c);
session.save(lm1);
session.save(lm2);
//4.提交事务
tx.commit();
}
/**
* 为客户添加联系人
*/
@Test
public void func1(){
//1.获得session
Session session = HibernateUtils.getCurrentSession();
//2.开启事务
Transaction tx = session.beginTransaction();
//3.操作
//获得要操作的客户对象
Customer c = session.get(Customer.class, 1);
//创建联系人
LinkMan lm1 = new LinkMan();
lm1.setLkm_name("www");
//键联系人添加到客户
c.getLinkMans().add(lm1);
lm1.setCustomer(c);
//执行保存
session.save(lm1);
//4.提交事务
tx.commit();
}
/**
* 为客户删除一个联系人
*/
@Test
public void func2(){
//1.获得session
Session session = HibernateUtils.getCurrentSession();
//2.开启事务
Transaction tx = session.beginTransaction();
//3.操作
//获得要操作的客户对象
Customer c = session.get(Customer.class, 1); //持久化对象
//获得要移除的联系人
LinkMan link = session.get(LinkMan.class, 3l); //持久化对象
c.getLinkMans().remove(link);
link.setCustomer(null);
//将联系人从客户集合中移除
//4.提交事务
tx.commit();
}
}
操作进阶cascade ---不推荐使用
在实际使用中一般使用save-update
级联操作属性cascade
save-update:级联保存更新
delete:级联删除
all 级联删除和保存
级联操作 :简化操作
可以在customer.hbm.xml文件中添加
<set name="linkMans" cascade="all">
<key column="lkm_cust_id"></key>
<one-to-many class="LinkMan"></one-to-many>
</set>
也可以在linkman.hbm.xml
<many-to-one name="customer" column="lkm_cust_id" class="Customer" cascade="all"></many-to-one>
也可以同时添加
测试
/**
* 保存客户以及客户下的联系人
* cascade save-update
*/
@Test
public void func(){
//1.获得session
Session session = HibernateUtils.getCurrentSession();
//2.开启事务
Transaction tx = session.beginTransaction();
//3.操作
Customer c = new Customer();
c.setCust_name("zhiduowa");
LinkMan lm1 = new LinkMan();
lm1.setLkm_name("董事长");
LinkMan lm2 = new LinkMan();
lm2.setLkm_name("总经理");
LinkMan lm3 = new LinkMan();
lm3.setLkm_name("人事");
//表达一对多
c.getLinkMans().add(lm1);
c.getLinkMans().add(lm2);
//表达多对一
lm1.setCustomer(c);
lm2.setCustomer(c);
session.save(c);
//4.提交事务
tx.commit();
}
/**
* 删除客户级联删除下面的联系人
* cascade delete
*/
@Test
public void func1(){
//1.获得session
Session session = HibernateUtils.getCurrentSession();
//2.开启事务
Transaction tx = session.beginTransaction();
//3.操作
//获得要操作的客户对象
Customer c = session.get(Customer.class, 1);
//调用delete删除客户
session.delete(c);
//4.提交事务
tx.commit();
}
/**
* 保存联系人 以及联系人对应的客户
*/
@Test
public void func2(){
//1.获得session
Session session = HibernateUtils.getCurrentSession();
//2.开启事务
Transaction tx = session.beginTransaction();
//3.操作
//创建一个联系人
Customer c = new Customer();
c.setCust_name("Hanmei");
LinkMan lkm = new LinkMan();
lkm.setLkm_name("jack");
c.getLinkMans().add(lkm);
lkm.setCustomer(c);
session.save(lkm);
//4.提交事务
tx.commit();
}
关系维护
inverse属性,用来配置关系维护
多的一方,不能放弃维护关系,外键自段,就在多的一方
true 不维护
false 自己维护
查看hibernate控制台打印的sql信息
Hibernate:
insert
into
cst_customer
(cust_name, cust_source, cust_industry, cust_level, cust_linkman, cust_phone, cust_mobile)
values
(?, ?, ?, ?, ?, ?, ?)
Hibernate:
insert
into
cst_linkman
(lkm_gender, lkm_name, lkm_phone, lkm_mobile, lkm_email, lkm_qq, lkm_position, lkm_memo, lkm_cust_id)
values
(?, ?, ?, ?, ?, ?, ?, ?, ?)
Hibernate:
insert
into
cst_linkman
(lkm_gender, lkm_name, lkm_phone, lkm_mobile, lkm_email, lkm_qq, lkm_position, lkm_memo, lkm_cust_id)
values
(?, ?, ?, ?, ?, ?, ?, ?, ?)
//下面的sql冗余上面是cst_linkman 表来维护 下面sql是custormer表维护
Hibernate:
update
cst_linkman
set
lkm_cust_id=?
where
lkm_id=?
Hibernate:
update
cst_linkman
set
lkm_cust_id=?
where
lkm_id=?
在custormer配置文件中配置
<!--inverse -->
<set name="linkMans" inverse="true">
<key column="lkm_cust_id"></key>
<one-to-many class="LinkMan"></one-to-many>
</set>
测试
@Test
public void func(){
//1.获得session
Session session = HibernateUtils.getCurrentSession();
//2.开启事务
Transaction tx = session.beginTransaction();
//3.操作
Customer c = new Customer();
c.setCust_name("zhiduowa");
LinkMan lm1 = new LinkMan();
lm1.setLkm_name("董事长");
LinkMan lm2 = new LinkMan();
lm2.setLkm_name("总经理");
LinkMan lm3 = new LinkMan();
lm3.setLkm_name("人事");
//表达一对多 在配置inverse时候,下面两行代码可以删除
c.getLinkMans().add(lm1);
c.getLinkMans().add(lm2);
//表达多对一
lm1.setCustomer(c);
lm2.setCustomer(c);
session.save(c);
session.save(lm1);
session.save(lm2);
//4.提交事务
tx.commit();
}
查看打印的sql语句 只有三条 提升了hibernate的性能。