jpa建表一对多

pom.xml:

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 
　　　　　　http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>cn.dy</groupId>
    <artifactId>springJpaOneToOne</artifactId>
    <version>1.0-SNAPSHOT</version>
    <properties>
        <spring.version>4.2.4.RELEASE</spring.version>
        <hibernate.version>5.0.7.Final</hibernate.version>
        <slf4j.version>1.6.6</slf4j.version>
        <log4j.version>1.2.12</log4j.version>
        <c3p0.version>0.9.1.2</c3p0.version>
        <mysql.version>5.1.6</mysql.version>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
    </properties>
    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
            <scope>test</scope>
        </dependency>
        <!--spring start-->
        <!--spring aop-->
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>1.6.8</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-aop</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <!--spring aop-->
        <!--spring ioc-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context-support</artifactId>
            <version>${spring.version}</version>
        </dependency>


        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-beans</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <!--spring ioc-->
        <!--spring end-->
        <!--spring 对orm框架的支持包-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-orm</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <!--spring 对orm框架的支持包-->
        <!--hibernate start-->
        <!--hibernate 核心包-->
        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-core</artifactId>
            <version>${hibernate.version}</version>
        </dependency>
        <!--hibernate 对JPA实现的包-->
        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-entitymanager</artifactId>
            <version>${hibernate.version}</version>
        </dependency>
        <!--hibernate 验证包-->
        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-validator</artifactId>
            <version>5.2.1.Final</version>
        </dependency>
        <!--hibernate end-->
        <dependency>
            <groupId>c3p0</groupId>
            <artifactId>c3p0</artifactId>
            <version>${c3p0.version}</version>
        </dependency>
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>${log4j.version}</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>${slf4j.version}</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-log4j12</artifactId>
            <version>${slf4j.version}</version>
        </dependency>

        <!--mysql的驱动包-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>${mysql.version}</version>
        </dependency>
        <!--spring dataJpa  的坐标-->
        <dependency>
            <groupId>org.springframework.data</groupId>
            <artifactId>spring-data-jpa</artifactId>
            <version>1.9.0.RELEASE</version>
        </dependency>
        <!--spring 测试 的坐标-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-test</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <!-- el 标签  的坐标-->
        <dependency>
            <groupId>javax.el</groupId>
            <artifactId>javax.el-api</artifactId>
            <version>2.2.4</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.web</groupId>
            <artifactId>javax.el</artifactId>
            <version>2.2.4</version>
        </dependency>
        <!-- el 标签  的坐标-->
    </dependencies>

</project>
resources:
　　applicationContext.xml:

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:jdbc="http://www.springframework.org/schema/jdbc"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xmlns:jpa="http://www.springframework.org/schema/data/jpa"

       xsi:schemaLocation="
            http://www.springframework.org/schema/beans
            http://www.springframework.org/schema/beans/spring-beans.xsd
            http://www.springframework.org/schema/aop
            http://www.springframework.org/schema/aop/spring-aop.xsd
            http://www.springframework.org/schema/context
            http://www.springframework.org/schema/context/spring-context.xsd
            http://www.springframework.org/schema/jdbc
            http://www.springframework.org/schema/jdbc/spring-jdbc.xsd
            http://www.springframework.org/schema/tx
            http://www.springframework.org/schema/tx/spring-tx.xsd
            http://www.springframework.org/schema/data/jpa
            http://www.springframework.org/schema/data/jpa/spring-jpa.xsd">
    <!--1 创建数据库的连接池-->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="password" value="root"/>
        <property name="user" value="root"/>
        <property name="jdbcUrl" value="jdbc:mysql://localhost:3306/spring_data?characterEncoding=utf-8"/>
        <property name="driverClass" value="com.mysql.jdbc.Driver"/>
    </bean>
    <!--2 工厂类对象-->
    <bean id="entityManagerFactory"
          class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
        <!--数据源-->
        <property name="dataSource" ref="dataSource"/>
        <!--实体类的扫描器-->
        <property name="packagesToScan" value="cn.dy.jpa.entity"/>
        <!--jpa配置供应商的适配器-->
        <property name="jpaVendorAdapter">
            <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
                <!--      指定数据库类型-->
                <property name="database" value="MYSQL"/>
                <!--    是否自动创建数据库表-->
                <property name="generateDdl" value="false"/>
                <!-- 数据库方言 支持的特有语法-->
                <property name="databasePlatform" value="org.hibernate.dialect.MySQLDialect"/>
                <!--是否向控制台输出语句 update hibernate.hbm2ddl.auto-->
                <property name="showSql" value="true"/>

            </bean>
        </property>
         <property name="jpaProperties">
             <props>
                 <prop key="hibernate.hbm2ddl.auto">update</prop>
             </props>
         </property>
    </bean>
    <!--配置事物-->
    <bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
        <property name="entityManagerFactory" ref="entityManagerFactory"/>
    </bean>
    <!--一般出现在sevice层  start-->
    <tx:advice id="txAdvice" transaction-manager="transactionManager">
        <tx:attributes>
            <tx:method name="save*" propagation="REQUIRED"/>
            <tx:method name="insert*" propagation="REQUIRED"/>
            <tx:method name="update*" propagation="REQUIRED"/>
            <tx:method name="delete*" propagation="REQUIRED"/>
            <tx:method name="get*" read-only="true"/>
            <tx:method name="find*" read-only="true"/>
            <tx:method name="*" propagation="REQUIRED"/>
        </tx:attributes>
    </tx:advice>
    <!--aop-->
    <aop:config>
        <aop:pointcut id="pointcut" expression="execution(* cn.dy.jpa.service.*.*(..))"/>
        <aop:advisor advice-ref="txAdvice" pointcut-ref="pointcut"/>
    </aop:config>
    <!--一般出现在sevice层 end-->

<!--    <context:component-scan base-package="cn.dy.jpa"></context:component-scan>-->
<!--    dao-->
    <jpa:repositories base-package="cn.dy.jpa.dao"
                      transaction-manager-ref="transactionManager"
                      entity-manager-factory-ref="entityManagerFactory"/>

</beans>

entity:
　　Tea主表：

package cn.dy.jpa.entity;

import javax.persistence.*;
import java.io.Serializable;
import java.util.HashSet;
import java.util.Set;

/**
 * author:dingyi
 * time:2019/8/20 0020 14:57
 */
// 声明该类是jpa的实体类
@Entity
@Table(name = "cust_tea")
public class Tea implements Serializable {
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Id
    @Column(name="tea_id")
    private long teaId;
    @Column(name="tea_name")
    private String teaName;
    @Column(name="tea_sex")
    private String teaSex;
    @Column(name="tea_age")
    private String teaAge;
    @Column(name="tea_Job")
    private String teaJob;
    // 配置教师与学生之间的关系 （一对多关系）
    /**
     * 使用注解的形式配置多表关系
     *       1.声明关系
     *              @OneToMany; 配置一对多关系
     *       2.配置外键（中间表）
     *       @JoinColumn:配置外键
     *            name 外键字段名称
     *            referencedColumnName：参照的主表字段名称
     *  在教师实体类上（一的一方）添加了外键配置，所以对于学生而言，也具备了维护外键的作用
     */
    @OneToMany(cascade = CascadeType.ALL,fetch = FetchType.EAGER)
//    @JoinColumn(name = "teaid",referencedColumnName = "tea_id")
    private Set<Stu> Stus=new HashSet<>();

    public long getTeaId() {
        return teaId;
    }

    public void setTeaId(long teaId) {
        this.teaId = teaId;
    }

    public String getTeaName() {
        return teaName;
    }

    public void setTeaName(String teaName) {
        this.teaName = teaName;
    }

    public String getTeaSex() {
        return teaSex;
    }

    public void setTeaSex(String teaSex) {
        this.teaSex = teaSex;
    }

    public String getTeaAge() {
        return teaAge;
    }

    public void setTeaAge(String teaAge) {
        this.teaAge = teaAge;
    }

    public String getTeaJob() {
        return teaJob;
    }

    public void setTeaJob(String teaJob) {
        this.teaJob = teaJob;
    }

    public Set<Stu> getStus() {
        return Stus;
    }

    public void setStus(Set<Stu> stus) {
        Stus = stus;
    }

    @Override
    public String toString() {
        return "Tea{" +
                "teaId=" + teaId +
                ", teaName='" + teaName + '\'' +
                ", teaSex='" + teaSex + '\'' +
                ", teaAge='" + teaAge + '\'' +
                ", teaJob='" + teaJob + '\'' +
                '}';
    }
}

Stu从表：

package cn.dy.jpa.entity;

import javax.persistence.*;
import java.io.Serializable;

/**
 * author:dingyi
 * time:2019/8/20 0020 17:32
 */
@Entity
@Table(name = "cust_stu")
public class Stu implements Serializable {
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Id
    @Column(name = "stu_id")
    private Long stuId;
    @Column(name = "stu_name")
    private String stuName;
    @Column(name = "stu_sex")
    private String stuSex;
    @Column(name = "stu_age")
    private String stuAge;

    /**
     * 配置学生到教师的多对一关系
     *     使用注解的形式配置多对一关系
     *        1.配置表关系
     *             @ManyToOne: 配置多对一关系
     *        2.配置外键（中间表）
     *        配置外键的过程，配置到了多的一方，就会再多的一方维护外键
     */
    @ManyToOne(cascade = CascadeType.ALL,fetch = FetchType.LAZY)
    @JoinColumn(name = "stuid",referencedColumnName = "tea_id")

    private  Tea tea;
    public Long getStuId() {
        return stuId;
    }

    public void setStuId(Long stuId) {
        this.stuId = stuId;
    }

    public String getStuName() {
        return stuName;
    }

    public void setStuName(String stuName) {
        this.stuName = stuName;
    }

    public String getStuSex() {
        return stuSex;
    }

    public void setStuSex(String stuSex) {
        this.stuSex = stuSex;
    }

    public String getStuAge() {
        return stuAge;
    }

    public void setStuAge(String stuAge) {
        this.stuAge = stuAge;
    }



    public Tea getTea() {
        return tea;
    }

    public void setTea(Tea tea) {
        this.tea = tea;
    }

    @Override
    public String toString() {
        return "Stu{" +
                "stuId=" + stuId +
                ", stuName='" + stuName + '\'' +
                ", stuSex='" + stuSex + '\'' +
                ", stuAge='" + stuAge + '\'' +

                '}';
    }
}

TeaDao:

package cn.dy.jpa.dao;

/**
 * author:dingyi
 * time:2019/8/20 0020 18:43
 */

import cn.dy.jpa.entity.Tea;

import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.jpa.repository.JpaSpecificationExecutor;





public interface TeaDao extends JpaRepository<Tea,Long>, JpaSpecificationExecutor<Tea> {

}
StuDao:

package cn.dy.jpa.dao;

import cn.dy.jpa.entity.Stu;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.jpa.repository.JpaSpecificationExecutor;



/**
 * author:dingyi
 * time:2019/8/20 0020 18:48
 */
public interface StuDao extends JpaRepository<Stu,Long>, JpaSpecificationExecutor<Stu> {
}

test测试1:
　　　　

import cn.dy.jpa.dao.StuDao;
import cn.dy.jpa.dao.TeaDao;
import cn.dy.jpa.entity.Stu;
import cn.dy.jpa.entity.Tea;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.test.annotation.Commit;
import org.springframework.test.annotation.Rollback;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import org.springframework.transaction.annotation.Transactional;

/**
 * author:dingyi
 * time:2019/8/20 0020 19:17
 */
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("classpath*:applicationContext.xml")
public class testOneToMany {
    @Autowired
        TeaDao teaDao;
    @Autowired
        StuDao stuDao;
    /**
     * 保存一个教师，一个学生
     *
     */
    @Test
    @Transactional //配置事务
    @Commit
    @Rollback(false) //不自动回滚
    public void testAdd(){
        //创建一个教师，创建一个学生
        Tea tea = new Tea();
        tea.setTeaName("吉泽明步");
        tea.setTeaAge("34");
        tea.setTeaSex("女");
        tea.setTeaJob("教师");

        Stu stu1 = new Stu();
        stu1.setStuName("张敏");
        stu1.setStuSex("女");
        stu1.setStuAge("32");
        Stu stu2 = new Stu();
        stu2.setStuName("思思");
        stu2.setStuSex("女");
        stu2.setStuAge("33");

        tea.getStus().add(stu1);
        tea.getStus().add(stu2);
        stu1.setTea(tea);
        stu2.setTea(tea);

        teaDao.save(tea);
        stuDao.save(stu1);
        stuDao.save(stu2);


    }
}

test测试2:

import cn.dy.jpa.dao.StuDao;
import cn.dy.jpa.dao.TeaDao;
import cn.dy.jpa.entity.Stu;
import cn.dy.jpa.entity.Tea;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.annotation.Commit;
import org.springframework.test.annotation.Rollback;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import org.springframework.transaction.annotation.Transactional;

import java.util.Set;

/**
 * author:dingyi
 * time:2019/8/21 0021 16:24
 */
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("classpath*:applicationContext.xml")
public class ObJQuerytest {
    @Autowired
    TeaDao teaDao;
    @Autowired
    StuDao stuDao;

    /**
     * could not initialize proxy - no Session  报错原因：  @Transactional
     */
    @Test
    @Transactional
    @Commit
    @Rollback(false)
    public void testQuery(){
        //查询id为1的教师
        Tea teaDaoOne = teaDao.getOne(1L);
        //对象导航查询，此教师下的所有学生
        Set<Stu> stus = teaDaoOne.getStus();
        for (Stu stu:stus){
            System.out.println(stu);
        }
    }
}