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();

    }

}