Hibernate 版本： v5.2.10
Eclipse版本：v4.7.1
JDK版本: v1.8
MySQL版本：v5.7

網上Hibernate資料少得可憐，又不能半途而廢，真心想好好學一下Hibernate. 直接上原始碼。

這是一個外來鍵關聯的案例，所以有兩個POJO類。

第一個POJO類

package com.bai.fan;

import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.OneToOne;

@Entity
public class
 
 One2One_A {
    int id;
    String name;
    One2One_B w2;
    @Id
    public int getId() {
        return id;
    }

    public String getName() {
        return name;
    }
@OneToOne
    public One2One_B getW2() {
        return w2;
    }

    public void setId(int id) {
        this.id = id;
    }



    public
 
 void setName(String name) {
        this.name = name;
    }

    public void setW2(One2One_B w2) {
        this.w2 = w2;
    }


}

第二個POJO類

package com.bai.fan;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;

@Entity
public class One2One_B
 
 {
    int id;
    String name;

    @Id
    @GeneratedValue
    public int getId() {
        return id;
    }

    public String getName() {
        return name;
    }

    public void setId(int id) {
        this.id = id;
    }

    public void setName(String name) {
        this.name = name;
    }

}

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>

        <property name="connection.driver_class">com.mysql.jdbc.Driver</property>

        <property name="connection.url">jdbc:mysql://localhost/hibernate</property>

        <property name="connection.username">root</property>

        <property name="connection.password">shwythnn00</property>

        <property name="dialect">org.hibernate.dialect.MySQL5InnoDBDialect</property>

        <property name="show_sql">true</property>

        <property name="hibernate.format_sql">true</property>

        <property name="hibernate.hbm2ddl.auto">update</property>

        <property name=""></property>

        <!-- <mapping class="com.bai.fan.Zhulei" /> -->
        <mapping class="com.bai.fan.One2One_A" />
        <mapping class="com.bai.fan.One2One_B" />
            // 這裡要特別注意，兩個POJO類的 Mapping 都要配置。
    </session-factory>
</hibernate-configuration>  

Junit TEST類

package com.bak.bum;

import java.util.EnumSet;

import org.hibernate.boot.Metadata;
import org.hibernate.boot.MetadataSources;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
import org.hibernate.service.ServiceRegistry;
import org.hibernate.tool.hbm2ddl.SchemaExport;
import org.hibernate.tool.schema.TargetType;
import org.junit.Test;

public class MyTest {

    @Test
    public void test() {
        ServiceRegistry serviceRegistry=new StandardServiceRegistryBuilder().configure().build();   
        Metadata metadata = new MetadataSources(serviceRegistry).buildMetadata();  
        SchemaExport schemaExport = new SchemaExport();
        schemaExport.create(EnumSet.of(TargetType.DATABASE), metadata); 
    }

}

執行結果

由於是外來鍵關聯，Hibernate 做了三次操作：create兩次，alter一次

MySQL確認資料表；