jpa学习笔记——2

了解了以下几个注解，暂时学习的jpa只是将注解注释到mysql中，类的字段与表的字段一一对应，表可以自动生成，数据也可以自动添加

@Entity

@Transient

@Temporal

@Table

@Id

@GeneratedValue

@Column

@Basic

直接上代码

package com.huawei.test;



import java.util.Date;

import javax.persistence.Basic;
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;
import javax.xml.crypto.Data;

@Table(name="JPA_CUSTOMERS")
@Entity
public class Customer {

	private Integer id;
	private String lastName;
	private String email;
	private int age;
	private Date createTime;
	private Date birth;
	
	//生成主键的策略
	@GeneratedValue(strategy=GenerationType.AUTO)
	@Id
	public Integer getId() {
		return id;
	}
	public void setId(Integer id) {
		this.id = id;
	}
	@Column(name="LAST_NAME", length=50, nullable=false)
	public String getLastName() {
		return lastName;
	}
	public void setLastName(String lastName) {
		this.lastName = lastName;
	}
	//默认是加上的 ，默认映射成数据表的一列
	@Basic
	public String getEmail() {
		return email;
	}
	public void setEmail(String email) {
		this.email = email;
	}
	public int getAge() {
		return age;
	}
	public void setAge(int age) {
		this.age = age;
	}
	
	//指定时间的类型，datetime类型，精确到秒
	@Temporal(TemporalType.TIMESTAMP)
	public Date getCreateTime() {
		return createTime;
	}
	public void setCreateTime(Date createTime) {
		this.createTime = createTime;
	}
	//指定时间的类型，date类型，精确到秒
	@Temporal(TemporalType.DATE)
	public Date getBirth() {
		return birth;
	}
	public void setBirth(Date birth) {
		this.birth = birth;
	}
	// 工具方法，不需要映射为数据表的一列
	//不映射成数据表的一列
	@Transient
	public String getInfo() {
		return "lastName" + this.lastName + " email:" + this.email;
	}
	
}