package com.magicode.jpa.helloworld;

 import java.util.Date;

 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.Temporal;

 import javax.persistence.TemporalType;

 import javax.persistence.Transient;

 /**

  * @Entity 用于注明该类是一个实体类

  * @Table(name="t_customer") 表明该实体类映射到数据库的 t_customer 表

  */

 @Table(name="t_customer")

 @Entity

 public class Customer {

     private Integer id;

     private String lastName;

     private String email;

     private int age;

     private Date birthday;

     private Date createdTime;

     /**

      * @GeneratedValue(strategy=GenerationType.AUTO) 指明主键生成策略为AUTO

      * @Id 表明实体类的主键

      */

     @GeneratedValue(strategy=GenerationType.AUTO)

     @Id

     public Integer getId() {

         return id;

     }

     /**

      * @Column 指明lastName属性映射到表的 LAST_NAME 列中

      * 同时还可以指定其长度、能否为null等数据限定条件

      */

     @Column(name="LAST_NAME", length=50, nullable=false)

     public String getLastName() {

         return lastName;

     }

     /**

      * 利用 @Temporal 来限定birthday为DATE型

      */

     @Column(name="birthday")

     @Temporal(TemporalType.DATE)

     public Date getBirthday() {

         return birthday;

     }

     /*

      * 通过 @Column 的 columnDefinition 属性将CREATED_TIME列

      * 映射为“DATE”类型

      */

     @Column(name="CREATED_TIME", columnDefinition="DATE")

     public Date getCreatedTime() {

         return createdTime;

     }

     /*

      * 通过 @Column 的 columnDefinition 属性将email列

      * 映射为“TEXT”类型

      */

     @Column(columnDefinition="TEXT")

     public String getEmail() {

         return email;

     }

     /*

      * 工具方法，不需要映射为数据表的一列

      */

     @Transient

     public String getInfo(){

         return "lastName: " + lastName + " email: " + email;

     }

     public int getAge() {

         return age;

     }

     public void setId(Integer id) {

         this.id = id;

     }

     public void setLastName(String lastName) {

         this.lastName = lastName;

     }

     public void setEmail(String email) {

         this.email = email;

     }

     public void setAge(int age) {

         this.age = age;

     }

     public void setBirthday(Date birthday) {

         this.birthday = birthday;

     }

     public void setCreatedTime(Date createdTime) {

         this.createdTime = createdTime;

     }

 }

// 4、调用EntityManager的persist方法完成持久化过程

Customer customer = new Customer();

customer.setAge(9);

customer.setEmail("Tom@163.com");

customer.setLastName("Tom");

//添加1

customer.setBirthday(new Date());

//添加2

customer.setCreatedTime(new Date());

em.persist(customer);