Hibernate初学者---5.2.10版本_SchemaExpor 自动生成数据表

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

网上Hibernate资料少得可怜，又不能半途而废，真心想好好学一下Hibernate. 直接上源码。

这是一个外键关联的案例，所以有两个POJO类。

第一个POJO类

package com.bai.fan;import javax.persistence.Entity;import javax.persistence.Id;import javax.persistence.OneToOne;@Entitypublic 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;    }}

---

---

第二个POJO类

package com.bai.fan;import javax.persistence.Entity;import javax.persistence.GeneratedValue;import javax.persistence.Id;@Entitypublic 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" />            // 这里要特别注意，两个POJO类的 Mapping 都要配置。    </session-factory></hibernate-configuration>  

---

Junit TEST类

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);     }}

---

运行结果

由于是外键关联，Hibernate 做了三次操作：create两次，alter一次

---

MySQL确认数据表；