项目结构：

Wife

package auth.model;import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.OneToOne;
import javax.persistence.Table;@Entity
@Table(name="wife")
public class Wife {private int id;private String name;private int age;private Husband husband;@Id@GeneratedValue(strategy=GenerationType.AUTO)@Column(name="id")public int getId() {return id;}public void setId(int id) {this.id = id;}@Column(name="name")public String getName() {return name;}public void setName(String name) {this.name = name;}@Column(name="age")public int getAge() {return age;}public void setAge(int age) {this.age = age;}//mappedBy="wife"表示Husband中wife属性已经做映射,如果不写mappedBy="wife"会在wife表中生成一个husband_id外键,这是多余的。//mappedBy指向被维护端wife,由husband维护@OneToOne(mappedBy="wife",cascade=CascadeType.ALL,fetch=FetchType.LAZY,targetEntity=Husband.class)public Husband getHusband() {return husband;}public void setHusband(Husband husband) {this.husband = husband;}
}

Husband

package auth.model;import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType; import javax.persistence.GeneratedValue; import javax.persistence.GenerationType; import javax.persistence.Id; import javax.persistence.JoinColumn; import javax.persistence.OneToOne; import javax.persistence.Table; @Entity @Table(name="husband") public class Husband { private int id; private String name; private int age; private Wife wife; @Id @GeneratedValue(strategy=GenerationType.AUTO) @Column(name="id") public int getId() { return id; } public void setId(int id) { this.id = id; } @Column(name="name") public String getName() { return name; } public void setName(String name) { this.name = name; } @Column(name="age") public int getAge() { return age; } public void setAge(int age) { this.age = age; } //注意：这个husband的id要和wife的id一样,表的主键同时是另一张表的外键,不然无法关联 @OneToOne(cascade=CascadeType.ALL,fetch=FetchType.LAZY,targetEntity=Wife.class) @JoinColumn(name="id", unique=true, nullable=false, updatable=false) public Wife getWife() { return wife; } public void setWife(Wife wife) { this.wife = wife; } } 

DAO：

package auth.dao;import org.springframework.data.jpa.repository.JpaRepository;import auth.model.Husband;public interface HusbandRepository extends JpaRepository<Husband, Integer>{ } package auth.dao; import org.springframework.data.jpa.repository.JpaRepository; import auth.model.Wife; public interface WifeRepository extends JpaRepository<Wife, Integer>{ } 

UserController

package auth.controller;import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;import com.alibaba.fastjson.JSONObject;import auth.dao.HusbandRepository;
import auth.dao.WifeRepository;
import auth.model.Husband;
import auth.model.Wife;
@Service
public class UserController {private Logger log=LoggerFactory.getLogger(this.getClass());@Autowiredprivate HusbandRepository husDao;@Autowiredprivate WifeRepository wifeDao;public void addUser(){Husband hus=new Husband();hus.setAge(23);hus.setName("wy2");Wife wife=new Wife();wife.setName("xxt2");wife.setAge(22);wife.setHusband(hus);wifeDao.save(wife);}public void deleteUser(){wifeDao.delete(7);}public void updateUser(){Wife wife=wifeDao.findOne(8);wife.setName("wf");wife.getHusband().setName("updatehus");wifeDao.save(wife);}public String queryUser(){Wife wife=wifeDao.findOne(8);return JSONObject.toJSONString(wife);}
}

Tests

package spring;import org.junit.Test;
import org.springframework.beans.factory.annotation.Autowired;import auth.controller.UserController;public class Tests extends Base{ @Autowired private UserController con; @Test public void addUser(){ con.addUser(); } @Test public void deleteUser(){ con.deleteUser(); } @Test public void updateUser(){ con.updateUser(); } @Test public void queryUser(){ String result=con.queryUser(); System.out.println(result); } } 

运行过程：

add

insert intowife(age, name) values (?, ?) 2017-05-26 09:01:21,653 DEBUG [org.hibernate.id.IdentifierGeneratorHelper:94] - Natively generated identity: 9 2017-05-26 09:01:21,664 DEBUG [org.hibernate.engine.spi.ActionQueue:196] - Executing identity-insert immediately 2017-05-26 09:01:21,665 DEBUG [org.hibernate.SQL:109] - insert into husband (age, name) values (?, ?)

delete

delete fromhusband whereid=?
2017-05-26 08:58:00,180 DEBUG [org.hibernate.SQL:109] - delete from wife where id=?

update

updatehusband setage=?,name=? where id=? 2017-05-26 09:10:33,317 DEBUG [org.hibernate.SQL:109] - update wife set age=?, name=? where id=?

query

selectwife0_.id as id1_1_0_,wife0_.age as age2_1_0_,wife0_.name as name3_1_0_ fromwife wife0_ wherewife0_.id=?
2017-05-26 09:00:05,215 DEBUG [org.hibernate.loader.plan.exec.process.internal.ResultSetProcessorImpl:127] - Starting ResultSet row #0 2017-05-26 09:00:05,219 DEBUG [org.hibernate.loader.plan.exec.process.internal.EntityReferenceInitializerImpl:142] - On call to EntityIdentifierReaderImpl#resolve, EntityKey was already known; should only happen on root returns with an optional identifier specified 2017-05-26 09:00:05,241 DEBUG [org.hibernate.engine.internal.TwoPhaseLoad:160] - Resolving associations for [auth.model.Wife#8] 2017-05-26 09:00:05,243 DEBUG [org.hibernate.SQL:109] - select husband0_.id as id1_0_0_, husband0_.age as age2_0_0_, husband0_.name as name3_0_0_ from husband husband0_ where husband0_.id=?