Hibernate进阶学习3

其他 2018-11-19 11:38:03 阅读次数: 0

Hibernate进阶学习3

测试hibernate的多表关联操作（一对多，多对一，多对多）

表之间的关系主要在类与元数据配置文件中体现

package com.hibernate.domain;

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

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_linkman;
    private String cust_phone;
    private String cust_mobile;

    /** 使用set集合,表达一对多关系 */
    private Set<LinkMan> linkMens = new HashSet<LinkMan>();

    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_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 + "]";
    }

}
Customer 
<?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">
<!-- 配置表与实体对象的关系 -->
<hibernate-mapping package="com.hibernate.domain">
    <!-- class元素: 配置实体与表的对应关系的 -->
    <class name="Customer" table="cst_customer">
        <!-- id元素:配置主键映射的属性 -->
        <id name="cust_id">
            <!-- generator:主键生成策略，每条数据录入时，主键的生成规则 -->
            <generator class="native"></generator>
        </id>
        <!-- property元素:除id之外的普通属性映射 -->
        <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>

        <!-- 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
         -->
        <!--
            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.
         -->
        <!-- inverse属性: 配置关系是否维护.
                true: customer不维护关系
                false(默认值): customer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="linkMens" inverse="true" cascade="delete"  >
            <key column="lkm_cust_id" ></key>
            <one-to-many class="LinkMan" />
        </set>

    </class>
</hibernate-mapping>
Customer.hbm.xml 
package com.hibernate.domain;

public class LinkMan {
    private Long lkm_id;
    private Character lkm_gender;
    private String lkm_name;
    private String lkm_phone;
    private String lkm_email;
    private String lkm_qq;
    private String lkm_mobile;
    private String lkm_memo;
    private String lkm_position;

    /**
     * 表达多对一关系
     */
    private Customer customer ;

    public Customer getCustomer() {
        return customer;
    }
    public void setCustomer(Customer customer) {
        this.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_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_position() {
        return lkm_position;
    }

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

}
LinkMan 
<?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="com.hibernate.domain" >
    <class name="LinkMan" table="cst_linkman" >
        <id name="lkm_id"  >
            <generator class="native"></generator>
        </id>
        <property name="lkm_gender"  ></property>
        <property name="lkm_name"  ></property>
        <property name="lkm_phone"  ></property>
        <property name="lkm_email"  ></property>
        <property name="lkm_qq"  ></property>
        <property name="lkm_mobile"  ></property>
        <property name="lkm_memo"  ></property>
        <property name="lkm_position"  ></property>
        
        <!-- 多对一 -->
        <!-- 
            name属性:引用属性名
            column属性: 外键列名
            class属性: 与我关联的对象完整类名
         -->
          <!-- 
             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.
          -->
          <!-- 多的一方: 不能放弃维护关系的.外键字段就在多的一方.  -->
        <many-to-one name="customer" column="lkm_cust_id" class="Customer"  >
        </many-to-one>
    </class>
</hibernate-mapping>
LinkMan.hbm.xml 
package com.hibernate.domain;

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

public class Role {
    private Long role_id;
    private String role_name;
    private String role_memo;

    /**
     * 表达多对多
     */
    private Set<User> users = new HashSet<User>();

    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;
    }
    public Set<User> getUsers() {
        return users;
    }
    public void setUsers(Set<User> users) {
        this.users = users;
    }
    
}
Role 
<?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="com.hibernate.domain" >
    <class name="Role" table="sys_role" >
        <id name="role_id"  >
            <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>
Role.hbm.xml 
package com.hibernate.domain;

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

public class User {
    private Long user_id;
    private String user_code;
    private String user_name;
    private String user_password;
    private Character user_state;

    /** 表达多对多 */
    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_name() {
        return user_name;
    }
    public void setUser_name(String user_name) {
        this.user_name = user_name;
    }
    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;
    }
    public Set<Role> getRoles() {
        return roles;
    }
    public void setRoles(Set<Role> roles) {
        this.roles = roles;
    }
}
User 
<?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="com.hibernate.domain" >
    <class name="User" table="sys_user" >
        <id name="user_id"  >
            <generator class="native"></generator>
        </id>
        <property name="user_code"  ></property>
        <property name="user_name"  ></property>
        <property name="user_password"  ></property>
        <property name="user_state"  ></property>
    
        <!-- 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>
User.hbm.xml

测试一对多，多对一

package com.hibernate.onetomany;

import com.hibernate.domain.Customer;
import com.hibernate.domain.LinkMan;
import com.hibernate.utils.HibernateUtils;
import org.hibernate.Criteria;
import org.hibernate.Session;
import org.hibernate.Transaction;
import org.junit.Test;

import java.util.List;

/**
 * @author: 肖德子裕
 * @date: 2018/11/18 19:38
 * @description: 测试一对多操作
 */
public class Demo01 {
    /** 添加客户和联系人信息 */
    @Test
    public void test1(){
        //获取session
        Session session = HibernateUtils.openSession();
        //开启事务
        Transaction transaction = session.beginTransaction();

        /********************* 数据库操作 **********************/

        Customer customer=new Customer();
        customer.setCust_name("xdzy");

        LinkMan linkMan=new LinkMan();
        linkMan.setLkm_name("王五");
        LinkMan linkMan2=new LinkMan();
        linkMan2.setLkm_name("王五");

        customer.getLinkMens().add(linkMan);
        customer.getLinkMens().add(linkMan2);

        linkMan.setCustomer(customer);
        linkMan2.setCustomer(customer);

        session.save(customer);
        session.save(linkMan);
        session.save(linkMan2);

        /*******************************************************/

        //提交事务
        transaction.commit();
        //关闭资源
        session.close();
    }

    /** 为客户添加联系人 */
    @Test
    public void test2(){
        //获取session
        Session session = HibernateUtils.openSession();
        //开启事务
        Transaction transaction = session.beginTransaction();

        /********************* 数据库操作 **********************/

        Customer customer = session.get(Customer.class, 1L);

        LinkMan linkMan=new LinkMan();
        linkMan.setLkm_name("刘三");

        customer.getLinkMens().add(linkMan);
        linkMan.setCustomer(customer);

        session.save(linkMan);

        /*******************************************************/

        //提交事务
        transaction.commit();
        //关闭资源
        session.close();
    }

    /** 为客户移除联系人 */
    @Test
    public void test3(){
        //获取session
        Session session = HibernateUtils.openSession();
        //开启事务
        Transaction transaction = session.beginTransaction();

        /********************* 数据库操作 **********************/

        Customer customer = session.get(Customer.class, 1L);
        LinkMan linkMan=session.get(LinkMan.class,3L);

        customer.getLinkMens().remove(linkMan);
        linkMan.setCustomer(null);

        /*******************************************************/

        //提交事务
        transaction.commit();
        //关闭资源
        session.close();
    }
}
demo1 
package com.hibernate.onetomany;

import com.hibernate.domain.Customer;
import com.hibernate.domain.LinkMan;
import com.hibernate.utils.HibernateUtils;
import org.hibernate.Session;
import org.hibernate.Transaction;
import org.junit.Test;

/**
 * @author: 肖德子裕
 * @date: 2018/11/19 8:05
 * @description: 测试级联操作
 */
public class Demo02 {
    /** 删除用户时级联删除联系人;cascade:delete */
    @Test
    public void test1(){
        //获取session
        Session session = HibernateUtils.openSession();
        //开启事务
        Transaction transaction = session.beginTransaction();

        /********************* 数据库操作 **********************/

        Customer customer = session.get(Customer.class, 1L);
        session.delete(customer);

        /*******************************************************/

        //提交事务
        transaction.commit();
        //关闭资源
        session.close();
    }
}
demo2

测试多得多

package com.hibernate.manytomany;

import com.hibernate.domain.Customer;
import com.hibernate.domain.LinkMan;
import com.hibernate.domain.Role;
import com.hibernate.domain.User;
import com.hibernate.utils.HibernateUtils;
import org.hibernate.Session;
import org.hibernate.Transaction;
import org.junit.Test;

/**
 * @author: 肖德子裕
 * @date: 2018/11/19 10:15
 * @description: 测试多得多操作
 */
public class Demo01 {
    /** 添加员工以及员工的职位 */
    @Test
    public void test1(){
        //获取session
        Session session = HibernateUtils.openSession();
        //开启事务
        Transaction transaction = session.beginTransaction();

        /********************* 数据库操作 **********************/

        User user=new User();
        user.setUser_name("xdzy");
        User user1=new User();
        user1.setUser_name("王五");

        Role role=new Role();
        role.setRole_name("学生");
        Role role1=new Role();
        role1.setRole_name("老师");

        user.getRoles().add(role);
        user.getRoles().add(role1);
        user1.getRoles().add(role);
        user1.getRoles().add(role1);

        role.getUsers().add(user);
        role.getUsers().add(user1);
        role1.getUsers().add(user);
        role1.getUsers().add(user1);

        session.save(user);
        session.save(user1);
        session.save(role);
        session.save(role1);

        /*******************************************************/

        //提交事务
        transaction.commit();
        //关闭资源
        session.close();
    }

    /** 为员工添加一个职位 */
    @Test
    public void test2(){
        //获取session
        Session session = HibernateUtils.openSession();
        //开启事务
        Transaction transaction = session.beginTransaction();

        /********************* 数据库操作 **********************/

        User user = session.get(User.class, 1L);
        Role role=new Role();
        role.setRole_name("班主任");
        user.getRoles().add(role);
        session.save(user);

        /*******************************************************/

        //提交事务
        transaction.commit();
        //关闭资源
        session.close();
    }
}
demo1

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