以微博或博客为例，我们希望用户-用户信息设计为如下关系，即用户表用户口令登录等操作、用户信息表用户记录信息：

用户User代码清单：

import ***;/*** @author Barudisshu*/
@Entity
@Table(name = "t_user", schema = "", catalog = "db_blog")
public class User implements Serializable {private int id;                 //用户自动Idprivate String username;        //用户名private String password;        //密码private Info info;              //用户信息@Id@Column(name = "id", nullable = false, insertable = true, updatable = true)public int getId() {return id;}public void setId(int id) {this.id = id;}@Basic@Column(name = "username", nullable = true, insertable = true, updatable = true, length = 255)public String getUsername() {return username;}public void setUsername(String username) {this.username = username;}@Basic@Column(name = "password", nullable = true, insertable = true, updatable = true, length = 255)public String getPassword() {return password;}public void setPassword(String password) {this.password = password;}@OneToOne(cascade = CascadeType.ALL, targetEntity = Info.class,mappedBy = "user")public Info getInfo() {return info;}public void setInfo(Info info) {this.info = info;}//Override Object method
}

使用@OnetoOne标明1-1关联关系，并指定映射实体字段为user。

用户信息Info代码清单：

import ***;/*** @author Barudisshu*/
@Entity
@Table(name = "t_info", schema = "", catalog = "db_blog")
public class Info implements Serializable {private int id;             //用户信息自动Idprivate String mood;        //发布心情private Integer qq;         //QQ号码private String email;       //电子邮箱private String phone;       //电话号码private String avatar;      //头像地址private String qqBlog;      //腾讯博客private String sinaBlog;    //新浪博客private String leave;       //博主留言private User user;          //用户信息@Id@Column(name = "id", nullable = false, insertable = true, updatable = true)public int getId() {return id;}public void setId(int id) {this.id = id;}@Basic@Column(name = "mood", nullable = true, insertable = true, updatable = true, length = 255)public String getMood() {return mood;}public void setMood(String mood) {this.mood = mood;}@Basic@Column(name = "QQ", nullable = true, insertable = true, updatable = true)public Integer getQq() {return qq;}public void setQq(Integer qq) {this.qq = qq;}@Basic@Column(name = "email", nullable = true, insertable = true, updatable = true, length = 400)public String getEmail() {return email;}public void setEmail(String email) {this.email = email;}@Basic@Column(name = "phone", nullable = true, insertable = true, updatable = true, length = 120)public String getPhone() {return phone;}public void setPhone(String phone) {this.phone = phone;}@Basic@Column(name = "avatar", nullable = true, insertable = true, updatable = true, length = 4000)public String getAvatar() {return avatar;}public void setAvatar(String avatar) {this.avatar = avatar;}@Basic@Column(name = "QQBlog", nullable = true, insertable = true, updatable = true, length = 4000)public String getQqBlog() {return qqBlog;}public void setQqBlog(String qqBlog) {this.qqBlog = qqBlog;}@Basic@Column(name = "SinaBlog", nullable = true, insertable = true, updatable = true, length = 4000)public String getSinaBlog() {return sinaBlog;}public void setSinaBlog(String sinaBlog) {this.sinaBlog = sinaBlog;}@Basic@Column(name = "contact", nullable = true, insertable = true, updatable = true, length = 800)public String getLeave() {return leave;}public void setLeave(String leave) {this.leave = leave;}@OneToOne(optional = false)@PrimaryKeyJoinColumnpublic User getUser() {return user;}public void setUser(User user) {this.user = user;}//Override Object method
}

用户信息表Info使用@PrimaryKeyJoinColumn注解字段user为主键字段。