JPA測试实例

依赖架包

实体

import javax.persistence.Column;

import javax.persistence.Entity;

import javax.persistence.GeneratedValue;

import javax.persistence.GenerationType;

import javax.persistence.Id;

import javax.persistence.Table;

import javax.persistence.Transient;

/**

* 持久化实体类使用注解配置

* @author Administrator

*

*/

@Table

@Entity

public class Customer {

private int id;

private String username;

private int age;

private String email;

@Column(name="id")

@GeneratedValue(strategy=GenerationType.AUTO)

@Id

public int getId() {

return id;

}

public void setId(int id) {

this.id = id;

}

//其它数据可能和实体实体属性相应的能够不加注解

public String getUsername() {

return username;

}

public void setUsername(String username) {

this.username = username;

}

public int getAge() {

return age;

}

public void setAge(int age) {

this.age = age;

}

public String getEmail() {

return email;

}

public void setEmail(String email) {

this.email = email;

}

@Transient

public String getInfo(){

return "name:"+username+",age"+age+",email"+email;

}

}

測试类

import javax.persistence.EntityManager;

import javax.persistence.EntityManagerFactory;

import javax.persistence.EntityTransaction;

import javax.persistence.Persistence;

public class TestOrm {

public static void main(String[] args){

//创建EntityManagerFactory

String str="jpa";

EntityManagerFactory factory=Persistence.createEntityManagerFactory(str);

//创建EntityManager

EntityManager manager=factory.createEntityManager();

//声明事务

EntityTransaction transation=manager.getTransaction();

transation.begin();

//持久化操作

Customer cus=new Customer();

//cus.setId(1);

cus.setUsername("xxxx");

cus.setAge(23);

cus.setEmail("[email protected]");

manager.persist(cus);//保存

//提交事务

transation.commit();

//关闭EntityMnager

manager.close();

//关闭EnetityManagerFactory

factory.close();

}

}