JPA注解数据类型

import java.util.Date;

import javax.persistence.Basic;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.EnumType;
import javax.persistence.Enumerated;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Lob;
import javax.persistence.Table;
import javax.persistence.Temporal;
import javax.persistence.TemporalType;
import javax.persistence.Transient;

@Entity
@Table(name="person_jpa")
public class PersonJPA {
private Integer id;     //主键，自增
private String name;
private Date birthday;  //日期类型
private Gender gender = Gender.MAN; //枚举
private byte[] image;   //存放很大的字节流
private String info;    //存放很大的文件
private String imgpath; //不想映射到数据库中的表字段

public PersonJPA(){}
public PersonJPA(String name){
this.name=name;
}

//id为主键，策略为auto，它为默认值，也可以省略下面括号里面的内容
@Id @GeneratedValue(strategy=GenerationType.AUTO)
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
@Column(length=20,name="person_name",nullable=false)
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
/**
* 使用@Temporal注解，可以设置日期类型
* @return
*/
@Temporal(TemporalType.DATE) @Column(length=12)
public Date getBirthday() {
return birthday;
}
public void setBirthday(Date birthday) {
this.birthday = birthday;
}
/**
* @Enumerated表示枚举注解
* @return
*/
@Enumerated(EnumType.STRING) @Column(nullable=false,length=8)
public Gender getGender() {
return gender;
}
public void setGender(Gender gender) {
this.gender = gender;
}
/**
* 使用@Basic注解，表示当获取person对象时，并不会加载该属性的值。只有当需要获取它的值时且
* EntityManager是打开的，那么只需要调用它的get方法就可以了。有点类似懒加载原理。
* @return
*/
@Lob @Basic(fetch=FetchType.LAZY)
public byte[] getImage() {
return image;
}
public void setImage(byte[] image) {
this.image = image;
}
/**
* 使用@Lob注解，表示设置大字符串，例如一片文章等
* @return
*/
@Lob
public String getInfo() {
return info;
}
public void setInfo(String info) {
this.info = info;
}
/**
* 使用@Transient注解，表示该字段并不会映射到数据库的表字段
* @return
*/
@Transient
public String getImgpath() {
return imgpath;
}
public void setImgpath(String imgpath) {
this.imgpath = imgpath;
}

}

public enum Gender {
MAN,WOMAN

}