package com.lixing.ibatis.entity.onetoone; public class Passport {    private int id;    private String serial;    private int expiry;    private Person person;  //Passport指向Person的引用       public int getId() {      return id;   }    public void setId( int id) {      this.id = id;   }    public String getSerial() {      return serial;   }    public void setSerial(String serial) {      this.serial = serial;   }    public int getExpiry() {      return expiry;   }    public void setExpiry( int expiry) {      this.expiry = expiry;   }    public Person getPerson() {      return person;   }    public void setPerson(Person person) {      this.person = person;   }   }

package com.lixing.ibatis.onetoone.mapper; import com.lixing.ibatis.entity.onetoone.Person; public interface PersonMapper {

   void insertPerson(Person person);   Person getPerson( int id); }

package com.lixing.ibatis.onetoone.mapper; import com.lixing.ibatis.entity.onetoone.Passport; public interface PassportMapper {    void insertPassport(Passport passport);   Passport getPassport( int id); }

<? xml version ="1.0" encoding ="UTF-8" ?> <!DOCTYPE mapper    PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"     "http://mybatis.org/dtd/mybatis-3-mapper.dtd"> < mapper namespace ="com.lixing.ibatis.onetoone.mapper.PersonMapper" >    < parameterMap type ="Person" id ="parameterPersonMap" >      < parameter property ="id" />      < parameter property ="name" />      < parameter property ="age" />    </ parameterMap >       < insert id ="insertPerson"     parameterMap ="parameterPersonMap" >      < selectKey     keyProperty ="id" resultType ="int" order ="AFTER" >       SELECT LAST_INSERT_ID() AS ID      </ selectKey >     INSERT INTO t_person(name,age)     VALUES(#{name},#{age})    </ insert >         < resultMap type ="Person" id ="personMap" >      < result property ="id" column ="id" />      < result property ="name" column ="name" />      < result property ="age" column ="age" />      <association property="passport" column="id" javaType="Passport" select="com.lixing.ibatis.onetoone.mapper.PassportMapper.getPassport">

    </association>

<!-- property:指Person中指向Passport对象的实例名称  -->

<!--select:指执行级联查询-->

   </ resultMap >      < select id ="getPerson" resultMap ="personMap" parameterType ="int" >     SELECT * FROM t_person     WHERE id=#{id}    </ select > </ mapper >    

<? xml version ="1.0" encoding ="UTF-8" ?> <!DOCTYPE mapper    PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"     "http://mybatis.org/dtd/mybatis-3-mapper.dtd"> < mapper namespace ="com.lixing.ibatis.onetoone.mapper.PassportMapper" >    < parameterMap type ="Passport" id ="passportMap" >      < parameter property ="id" />      < parameter property ="serial" />      < parameter property ="expiry" />        </ parameterMap >       < insert id ="insertPassport" parameterMap ="passportMap" >     INSERT INTO t_passport(id,serial,expiry)     VALUES(?,?,?)    </ insert >           < resultMap type ="Passport" id ="passportMap" >      < result property ="id" column ="id" />      < result property ="serial" column ="serial" />      < result property ="expiry" column ="expiry" />      <association property="person" column="id" select="com.lixing.ibatis.onetoone.mapper.PersonMapper.getPerson">    

    </association>    </ resultMap >       < select id ="getPassport" resultMap ="passportMap" parameterType ="int" >     SELECT *     FROM t_passport     WHERE id=#{id}    </ select >         </ mapper >

package com.lixing.ibatis.test; import java.sql.SQLException; import org.apache.ibatis.session.SqlSession; import org.apache.ibatis.session.SqlSessionFactory; import org.apache.ibatis.transaction.Transaction; import org.apache.ibatis.transaction.TransactionFactory; import org.apache.ibatis.transaction.jdbc.JdbcTransactionFactory; import org.junit.After; import org.junit.Before; import org.junit.Ignore; import org.junit.Test; import com.lixing.ibatis.entity.onetoone.Passport; import com.lixing.ibatis.entity.onetoone.Person; import com.lixing.ibatis.onetoone.mapper.PassportMapper; import com.lixing.ibatis.onetoone.mapper.PersonMapper; import com.lixing.ibatis.util.MyBatisUtil; public class PassportMapperTest {    private SqlSessionFactory sqlSessionFactory = null;    private SqlSession session = null;   @Before    public void before() {     sqlSessionFactory = MyBatisUtil.getInstance();     session = sqlSessionFactory.openSession();   }   @Test    public void testInsertPerson() throws SQLException {     Person person = new Person();     person.setName( "李新2");     person.setAge(25);          Passport passport = new Passport();          passport.setSerial( "Serial2");     passport.setExpiry(22222);               TransactionFactory transactionFactory = new JdbcTransactionFactory();     Transaction tx = transactionFactory.newTransaction(session         .getConnection(), false);         PersonMapper personMapper = session.getMapper(PersonMapper. class);     PassportMapper passportMapper = session.getMapper(PassportMapper. class);      try{       personMapper.insertPerson(person);           passport.setId(person.getId());       passportMapper.insertPassport(passport);       tx.commit();     } catch(Exception e){       tx.rollback();       e.printStackTrace();     } finally{       tx.close();       System.out.println(person.getId());     }   }   @Test    public void testGetPerson(){     PersonMapper personMapper=session.getMapper(PersonMapper. class);     Person person=personMapper.getPerson(2);     Passport passport=person.getPassport();     System.out.println(person.getId()+ "\t"+person.getName()+ "\t"+person.getAge()+ "\t"+passport.getSerial()+ "\t"+passport.getExpiry());     session.commit();   }      @Test    public void testGetPassport(){     PassportMapper passportMapper=session.getMapper(PassportMapper. class);     Passport passport=passportMapper.getPassport(2);     Person person=passport.getPerson();     System.out.println(passport.getId()+ "\t"+passport.getExpiry()+ "\t"+person.getName());   }       @After    public void after() {      session.close();   } }

<? xml version ="1.0" encoding ="UTF-8" ?> <!DOCTYPE configuration         PUBLIC "-//mybatis.org//DTD Config 3.0//EN"         "http://mybatis.org/dtd/mybatis-3-config.dtd"> < configuration >    < settings >     <!-- changes from the defaults for testing -->      < setting name ="cacheEnabled" value ="false" />      < setting name ="useGeneratedKeys" value ="true" />      < setting name ="defaultExecutorType" value ="REUSE" />    </ settings >       < typeAliases >     <!-- -->      < typeAlias alias ="Passport" type ="com.lixing.ibatis.entity.onetoone.Passport" />           < typeAlias alias ="Person" type ="com.lixing.ibatis.entity.onetoone.Person" />    </ typeAliases >    < environments default ="development" >      < environment id ="development" >        < transactionManager type ="JDBC" />        < dataSource type ="POOLED" >          < property name ="driver" value ="com.mysql.jdbc.Driver" />          < property name ="url" value ="jdbc:mysql://localhost:3306/test" />          < property name ="username" value ="root" />          < property name ="password" value ="7501857" />        </ dataSource >      </ environment >    </ environments >    < mappers >     <!-- -->      < mapper resource ="com/lixing/ibatis/onetoone/mapper/PassportMapper.xml" />           < mapper resource ="com/lixing/ibatis/onetoone/mapper/PersonMapper.xml" />         </ mappers > </ configuration >