java_hibernate 框架3

一对多 

一对多的实体                                                                       多对一的实体

需要使用set集合用于保存对象                                            需要一对多实体的对象

set<对象> 变量名                                                                对象 变量名

package domain;

import java.util.HashSet;
import java.util.Set;

public class Customer {
	
	public Set<LinkMan> getLinkMans() {
		return linkMans;
	}
	public void setLinkMans(Set<LinkMan> linkMans) {
		this.linkMans = linkMans;
	}
	private Long 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;
	private Set<LinkMan> linkMans = new HashSet<LinkMan>();
	
	public Customer() {
		super();
	}
	
	
	public Customer(String cust_name,Long cust_id) {
		super();
		this.cust_id = cust_id;
		this.cust_name=cust_name;
	}
	
	
	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_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 + "]";
	}
	
	
	

}

　　

package domain;

public class LinkMan {
	
	
	@Override
	public String toString() {
		return "LinkMan [lkm_id=" + lkm_id + ", lkm_name=" + lkm_name + ", lkm_gender=" + lkm_gender + ", lkm_phone="
				+ lkm_phone + ", lkm_email=" + lkm_email + ", lkm_qq=" + lkm_qq + ", lkm_mobile=" + lkm_mobile
				+ ", lkm_memo=" + lkm_memo + ", lkm_postion=" + lkm_postion + ", customer=" + customer + "]";
	}
	private Long lkm_id;
	private String lkm_name;
	private Character lkm_gender;
	private String lkm_phone;
	private String lkm_email;
	private String lkm_qq;
	private String lkm_mobile;
	private String lkm_memo;
	private String lkm_postion;
	private Customer customer;
	public Long getLkm_id() {
		return lkm_id;
	}
	public void setLkm_id(Long lkm_id) {
		this.lkm_id = lkm_id;
	}
	public String getLkm_name() {
		return lkm_name;
	}
	public void setLkm_name(String lkm_name) {
		this.lkm_name = lkm_name;
	}
	public Character getLkm_gender() {
		return lkm_gender;
	}
	public void setLkm_gender(Character lkm_gender) {
		this.lkm_gender = lkm_gender;
	}
	public String getLkm_phone() {
		return lkm_phone;
	}
	public void setLkm_phone(String lkm_phone) {
		this.lkm_phone = lkm_phone;
	}
	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_mobile() {
		return lkm_mobile;
	}
	public void setLkm_mobile(String lkm_mobile) {
		this.lkm_mobile = lkm_mobile;
	}
	public String getLkm_memo() {
		return lkm_memo;
	}
	public void setLkm_memo(String lkm_memo) {
		this.lkm_memo = lkm_memo;
	}
	public String getLkm_postion() {
		return lkm_postion;
	}
	public void setLkm_postion(String lkm_postion) {
		this.lkm_postion = lkm_postion;
	}
	public Customer getCustomer() {
		return customer;
	}
	public void setCustomer(Customer customer) {
		this.customer = customer;
	}
}

　　

orm元数据的表达就是

<!-- 集合,一对多关系,在配置文件中配置 -->
<!--
        name属性:集合属性名
　　column属性: 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"/>

</set>

多对一

<many-to-one name="customer" column="lkm_cust_id" class="Customer" ></many-to-one>

配置号xml后即可开始操作

public void func1() {
		Session sesion = HibernateUtils.openSession();
		Transaction tx = sesion.beginTransaction();
		//--------------------------------------
		Customer c = new Customer();
		c.setCust_name("as");
		LinkMan linkman = new LinkMan();
		linkman.setLkm_name("sss");
		
		LinkMan linkman2 = new LinkMan();
		linkman2.setLkm_name("ccc");
		//一对多
		c.getLinkMans().add(linkman);
		c.getLinkMans().add(linkman2);
		//多对一
		linkman.setCustomer(c);
		linkman2.setCustomer(c);
		
		sesion.save(c);
　　　　　　　　　　/*设置级联 不需要下面两行代码*/
		sesion.save(linkman);
		sesion.save(linkman2);
		
		//--------------------------------------
		tx.commit();
		sesion.close();
	}

　　这时候可以设置级联操作 就可以只写一边save了、 cascade属性

//一对多

<!-- 
级联操作:	cascade
save-update: 级联保存更新
delete:级联删除
all:save-update+delete
级联操作: 简化操作.目的就是为了少些两行代码.
-->

<set name="linkMans" cascade="save-update" inverse="true" lazy="true" fetch="select">
<key column="lkm_cust_id"></key>
<one-to-many class="LinkMan"/>

</set>

//多对一

<many-to-one name="customer" column="lkm_cust_id" class="Customer" cascade="save-update"></many-to-one>

　　

保存时.两方都会维护外键关系.关系维护两次,重复了.
显然只需要一端在维护关系

//一对多
<!-- inverse属性: 配置关系是否维护. 
		  		true: 放弃维护关系
		  		false(默认值): 维护关系
		  		
		  	inverse属性: 性能优化.提高关系维护的性能.
		  	原则: 无论怎么放弃,总有一方必须要维护关系.
		  	一对多关系中: 一的一方放弃.也只能一的一方放弃.多的一方不能放弃.
		  -->

<set name="linkMans" cascade="save-update" inverse="true" lazy="true" fetch="select">
　　<key column="lkm_cust_id"></key>
　　<one-to-many class="LinkMan"/>
</set>

//多对一
<many-to-one name="customer" column="lkm_cust_id" class="Customer" cascade="save-update"></many-to-one>

多对多

               实体1                                                                         实体2

需要使用set集合用于保存对象                                            需要使用set集合用于保存对象    

set<对象> 变量名                                                                set<对象> 变量名    

package domain;

import java.util.HashSet;
import java.util.Set;

public class User {
	@Override
	public String toString() {
		return "User [user_id=" + user_id + ", user_code=" + user_code + ", user_name=" + user_name + ", user_password="
				+ user_password + ", user_state=" + user_state + ", roles=" + roles + "]";
	}
	public String getUser_name() {
		return user_name;
	}
	public void setUser_name(String user_name) {
		this.user_name = user_name;
	}
	public Set<Role> getRoles() {
		return roles;
	}
	public void setRoles(Set<Role> roles) {
		this.roles = roles;
	}
	private Long user_id;
	private String user_code;
	private String user_name;
	private String user_password;
	private Character user_state;
	private Set<Role> roles = new HashSet<Role>();
	
	public Long getUser_id() {
		return user_id;
	}
	public void setUser_id(Long user_id) {
		this.user_id = user_id;
	}
	public String getUser_code() {
		return user_code;
	}
	public void setUser_code(String user_code) {
		this.user_code = user_code;
	}
	public String getUser_password() {
		return user_password;
	}
	public void setUser_password(String user_password) {
		this.user_password = user_password;
	}
	public Character getUser_state() {
		return user_state;
	}
	public void setUser_state(Character user_state) {
		this.user_state = user_state;
	}
	
}

　　

package domain;

import java.util.HashSet;
import java.util.Set;

public class Role {
	public Set<User> getUsers() {
		return users;
	}

	public void setUsers(Set<User> users) {
		this.users = users;
	}

	public Long getRole_id() {
		return role_id;
	}

	public void setRole_id(Long role_id) {
		this.role_id = role_id;
	}

	public String getRole_name() {
		return role_name;
	}

	public void setRole_name(String role_name) {
		this.role_name = role_name;
	}

	public String getRole_memo() {
		return role_memo;
	}

	public void setRole_memo(String role_memo) {
		this.role_memo = role_memo;
	}



	private Long role_id;
	private String role_name;
	private String role_memo;
	
	private Set<User> users = new HashSet<User>();
}

orm元数据

<?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="domain" >
	<class name="Role" table="sys_role" >
		<id name="role_id"  >
			<!-- generator:主键生成策略(明天讲) -->
			<generator class="native"></generator>
		</id>
		<property name="role_name"></property>
		<property name="role_memo"></property>
			<!-- 使用inverse属性
			true: 放弃维护外键关系
			false(默认值):维护关系
			
		结论: 将来在开发中,如果遇到多对多关系.一定要选择一方放弃维护关系.
			 一般谁来放弃要看业务方向. 例如录入员工时,需要为员工指定所属角色.
			 那么业务方向就是由员工维护角色. 角色不需要维护与员工关系.角色放弃维护
		 -->		
		
		<set name="users" table="sys_user_role" inverse="true">
			<key column="role_id"></key>
			<many-to-many class="User" column="user_id"></many-to-many>
		</set>
	</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="domain" >
	<class name="User" table="sys_user" >
		<id name="user_id"  >
			<generator class="native"></generator>
		</id>
		<property name="user_name" ></property>
		<property name="user_code" ></property>
		<property name="user_password"></property>
		<property name="user_state"></property>
		
		<!-- 多对多描述 -->
		<!-- 多对多关系表达 -->
		<!-- 
			name: 集合属性名
			table: 配置中间表名
			key
			 |-column:外键,别人引用"我"的外键列名
			 class: 我与哪个类是多对多关系
			 column:外键.我引用比人的外键列名
		 -->
		 <!-- cascade级联操作:
		 			save-update: 级联保存更新
		 			delete:级联删除
		 			all:级联保存更新+级联删除
		 	结论: cascade简化代码书写.该属性使不使用无所谓. 建议要用只用save-update.
		 		 如果使用delete操作太过危险.尤其在多对多中.不建议使用.
		 			 -->
		<set name="roles" table="sys_user_role" cascade="save-update">
			<key column="user_id"></key>
			<many-to-many class="Role" column="role_id"></many-to-many>
			
		</set>
	</class>
</hibernate-mapping>

　　操作多对多

public class demo3 {
	public void function1() {
		Session session = HibernateUtils.openSession();
		Transaction tx = session.beginTransaction();
		//--------------------------------------
		User user1 = new User();
		User user2 = new User();
		
		user1.setUser_name("user1");
		user2.setUser_name("user2");
		
		Role role1 = new Role();
		Role role2 = new Role();
		
		role1.setRole_name("role1");
		role2.setRole_name("role2");
		
		user1.getRoles().add(role1);
		user1.getRoles().add(role2);
		
		user2.getRoles().add(role1);
		user2.getRoles().add(role2);
		
		role1.getUsers().add(user1);
		role1.getUsers().add(user2);
		
		role2.getUsers().add(user1);
		role2.getUsers().add(user2);
		
		
		session.save(user1);
		session.save(user2);
		session.save(role1);
		session.save(role2);
		//--------------------------------------
		tx.commit();
		session.close();
	}
　　　　@Test

　　　　public void function3() {
　　　　　　Session session = HibernateUtils.openSession();
　　　　　   Transaction tx = session.beginTransaction();
　　　　　　//--------------------------------------

　　　　　　//删除关系
　　　　　　User user = session.get(User.class, 1l);
　　　　　　Role role1 = session.get(Role.class, 1l);
　　　　　　Role role2 = session.get(Role.class, 2l);
　　　　　　Role role3 = session.get(Role.class, 3l);
　　　　　　user.getRoles().remove(role1);
　　　　　　user.getRoles().remove(role2);
　　　　　　user.getRoles().remove(role3);

　　　　　　//session.save(user);



　　//--------------------------------------
　　tx.commit();
　　session.close();
}

}

　　多对多 使用inverse属性 只允许一方维护关系