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;

@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;
}

}

第二个POJO类

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" />
// 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；