Hibernate中ID生成策略 - 数据库编程

（3）测试(删除student表)

（4）验证

select * from student;

+----+------+-------+-------+

| id | name | age | score |

+----+------+-------+-------+

| 1 | 张三 | 20 | 90 |

+----+------+-----+--------+



desc student;

数据插入成功，id为int(11)类型，主键，Auto_increment

第二种：Annotation配置ID

@GeneratedValue，默认的策略是auto,auto相当于XML中配置的native。

小实验1：

（1）编写Teacher.java。在getId()方法上添加@GeneratedValue

package com.zgy.hibernate.model;



import java.util.Date;



import javax.annotation.Generated;

import javax.persistence.Column;

import javax.persistence.Entity;

import javax.persistence.EnumType;

import javax.persistence.Enumerated;

import javax.persistence.GeneratedValue;

import javax.persistence.Id;

import javax.persistence.Table;

import javax.persistence.Temporal;

import javax.persistence.TemporalType;

import javax.persistence.Transient;



@Entity

@Table(name="_teacher")

public class Teacher {

private int id;

private String name;

private String title;

private String address;

private String wifeName;

private Date birth;

private ZhiCheng zhiCheng;

@Id

@GeneratedValue

public int getId() {

return id;

}

public void setId(int id) {

this.id = id;

}

@Column(name="_name")

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

public String getTitle() {

return title;

}

public void setTitle(String title) {

this.title = title;

}

public String getAddress() {

return address;

}

public void setAddress(String address) {

this.address = address;

}



public String getWifeName() {

return wifeName;

}

public void setWifeName(String wifeName) {

this.wifeName = wifeName;

}

@Temporal(TemporalType.DATE)

public Date getBirth() {

return birth;

}

public void setBirth(Date birth) {

this.birth = birth;

}

@Enumerated(EnumType.STRING)

public ZhiCheng getZhiCheng() {

return zhiCheng;

}

public void setZhiCheng(ZhiCheng zhiCheng) {

this.zhiCheng = zhiCheng;

}





}

（2）编写TeacherTesting.java，用于测试

package com.zgy.hibernate.model;



import static org.junit.Assert.*;



import java.util.Date;



import org.hibernate.Session;

import org.hibernate.SessionFactory;

import org.hibernate.cfg.AnnotationConfiguration;

import org.hibernate.cfg.Configuration;

import org.junit.AfterClass;

import org.junit.BeforeClass;

import org.junit.Test;



public class TeacherTesting {

public static SessionFactory sf = null;

@BeforeClass

public static void beforeClass(){

sf = new AnnotationConfiguration().configure().buildSessionFactory();

}

@Test

public void test() {

Teacher t = new Teacher();



t.setName("t1");

t.setTitle("高级");

t.setAddress("北京");

t.setBirth(new Date());

t.setZhiCheng(ZhiCheng.A);



Session session = sf.openSession();

session.beginTransaction();

session.save(t);

session.getTransaction().commit();

session.close();



}



@AfterClass

Hibernate中ID生成策略(二)

第二种：Annotation配置ID