Hibernate一对一注解开发

title: Hibernate一对一注解开发

date: 2018-2-10 12:45:56

categories: Hibernate

tags: Hibernate

---

xl_echo编辑整理

Hibernate一对一注解开发

测试一对一注解开发java代码

package com.echo.hibernate.Test;

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

import com.echo.hibernate.onetoone.IdCard;
import com.echo.hibernate.onetoone.User;
import com.echo.hibernate.utils.HibernateUtils;

public class HibernateTest2 {

    @Test
    /**
     * 测试OneToOne，由于Cascaed配置在IdCard中，所以我们需要来保存IdCard来测试
     * 保存证件号，就保存用户
     */
    public void save(){
        Session session = HibernateUtils.getSession();
        session.beginTransaction();

        //创建IdCard
        IdCard ic = new IdCard();
        ic.setCardNum("1234567890");

        //创建User
        User user = new User();
        user.setName("echo");

        ic.setUser(user);

        session.save(ic);

        session.beginTransaction().commit();
        session.close();
    }

}

实体类注解配置代码

package com.echo.hibernate.onetoone;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.OneToOne;
import javax.persistence.Table;

import org.hibernate.annotations.Cascade;
import org.hibernate.annotations.CascadeType;
import org.hibernate.annotations.GenericGenerator;

@Entity
@Table(name="t_idcard",catalog="myxlsorry")
public class IdCard {
    @Id
    @GenericGenerator(name="myuuid",strategy="uuid")
    @GeneratedValue(generator="myuuid")
    private String id;
    private String cardNum;

    @OneToOne(targetEntity=User.class)
    @JoinColumn(name="t_user")
    @Cascade(CascadeType.SAVE_UPDATE)
    private User user;
    public String getId() {
        return id;
    }
    public void setId(String id) {
        this.id = id;
    }
    public String getCardNum() {
        return cardNum;
    }
    public void setCardNum(String cardNum) {
        this.cardNum = cardNum;
    }
    public User getUser() {
        return user;
    }
    public void setUser(User user) {
        this.user = user;
    }

}


package com.echo.hibernate.onetoone;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.OneToOne;
import javax.persistence.Table;

import org.hibernate.annotations.GenericGenerator;

@Entity
@Table(name="t_user",catalog="myxlsorry")
public class User {

    @Id
    @GenericGenerator(name="myuuid",strategy="uuid")
    @GeneratedValue(generator="myuuid")
    private String id;
    private String name;

    @OneToOne(targetEntity=IdCard.class,mappedBy="user")
    @JoinColumn(name="t_idcard")
    private IdCard idCard;

    public String getId() {
        return id;
    }
    public void setId(String id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public IdCard getIdCard() {
        return idCard;
    }
    public void setIdCard(IdCard idCard) {
        this.idCard = idCard;
    }

}

核心配置文件

<?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">

<!-- 这是核心配置文件 -->
<hibernate-configuration>

    <session-factory>
        <!-- 配置数据库连接的四个项 -->
        <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
        <property name="hibernate.connection.url">jdbc:mysql:///myxlsorry</property>
        <property name="hibernate.connection.username">root</property>
        <property name="hibernate.connection.password">20263800mq</property>
        <!-- 告知hibernate我们使用的是哪种数据库 -->
        <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>

        <!-- 设置数据库提交方式，默认false，设置为true就不用开启事务也能插入数据。注意：开启之后没法回滚数据？ -->
        <property name="hibernate.connection.autocommit">false</property>
        <!-- 自动创建表 -->
        <property name="hibernate.hbm2ddl.auto">update</property>


        <!-- 可以将操作数据库发送的sql显示出来 -->
        <property name="hibernate.show_sql">true</property>
        <!-- 格式化生sql  作用：让sql可读性更高，但是会提高控制台的输出信息量 -->
        <property name="hibernate.format_sql">true</property>



        <!-- 设置连接提供者，告知hibernate我们需要使用那个连接池 -->
        <property name="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider</property>
        <!-- c3p0连接池配置 -->
        <property name="hibernate.c3p0.max_size">20</property><!-- 最大连接数 -->
        <property name="hibernate.c3p0.min_size">5</property><!-- 最小连接数 -->
        <property name="hibernate.c3p0.timeout">120</property><!-- 超时 -->
        <property name="hibernate.c3p0.idle_test_period">3000</property><!-- 空闲链接时间 -->



        <!-- 配置hibernate的映射文件所在位置 -->
        <!-- <mapping resource="com/echo/hibernate/hibernatedomain/Person.hbm.xml"/> -->

        <!-- 使用注解开发mapping后面直接跟class即可，class后面跟全类名 -->
        <mapping class="com.echo.hibernate.domain.Book" />
        <mapping class="com.echo.hibernate.domain.Person" />

        <mapping class="com.echo.hibernate.domain.Customer" />
        <mapping class="com.echo.hibernate.domain.Orders" />

        <mapping class="com.echo.hibernate.manyonmany.Student" />
        <mapping class="com.echo.hibernate.manyonmany.Teacher" />

        <mapping class="com.echo.hibernate.onetoone.IdCard" />
        <mapping class="com.echo.hibernate.onetoone.User" />

    </session-factory>

</hibernate-configuration>