hibernate_one2one共享主键并延迟加载(注解形式)
直接上代码，一目了然， User UserDetail

import java.sql.Timestamp;import java.util.HashSet;import java.util.Set;import javax.persistence.CascadeType;import javax.persistence.Column;import javax.persistence.Entity;import javax.persistence.FetchType;import javax.persistence.GeneratedValue;import javax.persistence.OneToOne;import javax.persistence.PrimaryKeyJoinColumn;import static javax.persistence.GenerationType.IDENTITY;import javax.persistence.Id;import javax.persistence.JoinColumn;import javax.persistence.ManyToOne;import javax.persistence.OneToMany;import javax.persistence.Table;/** * User entity. @author MyEclipse Persistence Tools */@Entity@Table(name = "user")public class User implements java.io.Serializable {private Integer uid;private String username;private String password;private String realname;private UserDetail userDetail;public User() {userDetail = new UserDetail();}@Id@GeneratedValue(strategy = IDENTITY)@Column(name = "uid", unique = true, nullable = false)public Integer getUid() {return this.uid;}public void setUid(Integer uid) {this.uid = uid;}@Column(name = "username", length = 30)public String getUsername() {return this.username;}public void setUsername(String username) {this.username = username;}@Column(name = "password", length = 30)public String getPassword() {return this.password;}public void setPassword(String password) {this.password = password;}@Column(name = "realname", length = 10)public String getRealname() {return this.realname;}public void setRealname(String realname) {this.realname = realname;}//========================= 注意这里 ====================================@OneToOne(fetch = FetchType.LAZY, optional = false)       @PrimaryKeyJoinColumnpublic UserDetail getUserDetail() {return this.userDetail;}public void setUserDetail(UserDetail userDetail) {this.userDetail = userDetail;}//=======================================================================}

import javax.persistence.Column;import javax.persistence.Entity;import javax.persistence.FetchType;import javax.persistence.GeneratedValue;import javax.persistence.Id;import javax.persistence.JoinColumn;import javax.persistence.ManyToOne;import javax.persistence.OneToOne;import javax.persistence.Table;import org.hibernate.annotations.Parameter;import org.hibernate.annotations.GenericGenerator;/** * UserDetail entity. @author MyEclipse Persistence Tools */@Entity@Table(name = "user_detail")public class UserDetail implements java.io.Serializable {private Integer udid;private User user;private String description;public UserDetail() {}@Id       @GeneratedValue(generator = "pkGenerator")        @GenericGenerator(        name = "pkGenerator",        strategy = "foreign",        parameters = @Parameter(name = "property", value = "user")    ) @Column(name="udid")public Integer getUdid() {return this.udid;}public void setUdid(Integer udid) {this.udid = udid;}//========================= 注意这里 ====================================@OneToOne(mappedBy="userDetail", fetch=FetchType.LAZY, optional=false)public User getUser() {return this.user;}public void setUser(User user) {this.user = user;}//=======================================================================@Column(name = "description", length = 400)public String getDescription() {return this.description;}public void setDescription(String description) {this.description = description;}}