mybatis 一对一映射

xml

<mapper namespace="com.oracle.dao.one2oneDao">
    <sql id="personColum"> id,name,gender,age</sql>
    <sql id="passportColum"> id ,bh,person_id</sql>
    <sql id="passportColum2"> id ,bh</sql>

    <resultMap type="com.oracle.pojo.Passport" id="passportResultMap">
        <id column="id" property="id" javaType="int" jdbcType="INTEGER"/>
        <result column="bh" property="bh" javaType="string" jdbcType="VARCHAR"/>
        <association property="person" column="person_id" javaType="com.oracle.pojo.Person" select="getPerson"></association>
    </resultMap>

    <select id="getPerson" parameterType="int" resultType="com.oracle.pojo.Person">
        select <include refid="personColum"></include>
        from t_person_fk
        where id=#{id}
    </select>

    <select id="getPassport" parameterType="int" resultMap="passportResultMap">
        select <include refid="passportColum"></include>
        from t_passport_fk
        where person_id=#{id}
    </select>
    <!-- ||||||||||||||||||||||||||||||||||| -->

    <resultMap type="com.oracle.pojo.Passport" id="passportResult">
        <id column="id" property="id" javaType="int" jdbcType="INTEGER"/>
        <result column="bh" property="bh" javaType="string" jdbcType="VARCHAR"/>
        <association property="person" column="person_id" javaType="com.oracle.pojo.Person" resultMap="personResult"></association>
    </resultMap>

    <resultMap type="com.oracle.pojo.Person" id="personResult">
        <id column="id" property="id" javaType="int" jdbcType="INTEGER"/>
        <result column="name" property="name" javaType="string" jdbcType="VARCHAR"/>
        <result column="gender" property="gender" javaType="string" jdbcType="VARCHAR"/>
        <result column="age" property="age" javaType="int" jdbcType="INTEGER"/>
    </resultMap>

    <select id="getPersonAndPassport" parameterType="int" resultMap="passportResult">
        select person.id,person.name,person.age,person.gender,
        passport.id,passport.bh
        from t_passport_fk passport left join
        t_person_fk person on passport.person_id = person_id
        where person.id=#{id}
    </select>
    <!-- |||||||||||||主键映射||||||||||||||||||| -->

    <select id="getPersonPK" parameterType="int" resultType="com.oracle.pojo.Person">
        select <include refid="personColum"></include>
        from t_person_pk
        where id=#{id}
    </select>

    <select id="getPassportPk" parameterType="int" resultMap="passportResultMapPK">
        select <include refid="passportColum2"></include>
        from t_passport_pk
        where id=#{id}
    </select>

    <resultMap type="com.oracle.pojo.Passport" id="passportResultMapPK">
        <id column="id" property="id" javaType="int" jdbcType="INTEGER"/>
        <result column="bh" property="bh" javaType="string" jdbcType="VARCHAR"/>
        <association property="person" column="id" javaType="com.oracle.pojo.Person" select="getPersonPK"></association>
    </resultMap>
    

Dao

public interface one2oneDao {
    //////////////////外键映射
    public Passport getPassport(int id);

    public Passport getPersonAndPassport(int id);

    ///////////////////////主键映射

    public Passport getPassportPk(int id);

}

Test

    public static void main(String[] args) {
        //获取数据源
        String resource = "mybatis.xml";
        InputStream inputStream=null;
        try {
            inputStream = Resources.getResourceAsStream(resource);
        } catch (IOException e) {
            e.printStackTrace();
        }
        SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);

        SqlSession session = sqlSessionFactory.openSession();

        one2oneDao one2onedao = session.getMapper(one2oneDao.class);

//        Passport passport = one2onedao.getPassport(2);
//        System.out.println(passport);

//        Passport passport = one2onedao.getPersonAndPassport(2);
//        System.out.println(passport);

//        Passport passportPk = one2onedao.getPassportPk(1);
//        System.out.println(passportPk);

        session.commit();
    }

}

sql

/*基于外键映射*/
CREATE TABLE t_person_fk
 (
     id NUMBER(10) PRIMARY KEY,
     name VARCHAR2(20) NOT NULL,
     gender VARCHAR2(10),
     age NUMBER(3) CHECK(age BETWEEN 1 AND 100)
 );

 CREATE TABLE t_passport_fk
 (
     id NUMBER(10) PRIMARY KEY,
     bh VARCHAR2(30) NOT NULL UNIQUE,
     person_id NUMBER(10) REFERENCES t_person_fk(id) UNIQUE
 );

 CREATE SEQUENCE t_person_fk_seq
 START WITH 1
 INCREMENT BY 1;

 CREATE SEQUENCE t_passport_fk_seq
 START WITH 1
 INCREMENT BY 1;

 /*基于主键映射*/
 CREATE TABLE t_person_pk
 (
     id NUMBER(10) PRIMARY KEY,
     name VARCHAR2(20) NOT NULL,
     gender VARCHAR2(10),
     age NUMBER(3) CHECK(age BETWEEN 1 AND 100)
 );

 CREATE TABLE t_passport_pk
 (
     id NUMBER(10) PRIMARY KEY REFERENCES t_person_pk(id),
     bh VARCHAR2(30) NOT NULL UNIQUE
 );

 CREATE SEQUENCE t_person_pk_seq
 START WITH 1
 INCREMENT BY 1;