java框架之Mybatis03（一對一）

數據庫

create database student charset utf8;

use student;
CREATE TABLE student (
    sno INT NOT NULL PRIMARY KEY AUTO_INCREMENT,
    sname VARCHAR(12) NOT NULL,
    sage INT NOT NULL,
    addressID INT,
    FOREIGN KEY (addressID)
        REFERENCES address (id)
)

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use student;
CREATE TABLE address (
    id INT NOT NULL PRIMARY KEY AUTO_INCREMENT,
    sheng VARCHAR(12) NOT NULL,
    shi VARCHAR(12) NOT NULL,
    qu VARCHAR(12) NOT NULL

)

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StudentMapper.xml配置文件

<?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.imis.mappers.StudentMapper">
      <!-- 第一種 -->
      <!-- <resultMap type="Student" id="StudentResult">
         <id property="sno" column="sno"/>
         <result property="sname" column="sname"/>
         <result property="sage" column="sage"/>
         <result property="address.id" column="addressId"/>
         <result property="address.sheng" column="sheng"/>
         <result property="address.shi" column="shi"/>
         <result property="address.qu" column="qu"/>
     </resultMap> -->
     <!-- 第二種 -->
      <!-- <resultMap type="Address" id="AddressResult">
         <result property="id" column="id"/>
         <result property="sheng" column="sheng"/>
         <result property="shi" column="shi"/>
         <result property="qu" column="qu"/>
     </resultMap>
     
     <resultMap type="Student" id="StudentResult">
         <id property="sno" column="sno"/>
         <result property="sname" column="sname"/>
         <result property="sage" column="sage"/>
         <association property="address" resultMap="AddressResult"></association>
     </resultMap>  -->
     <!-- 第三種 -->
     <!--  <resultMap type="Student" id="StudentResult">
         <id property="sno" column="sno"/>
         <result property="sname" column="sname"/>
         <result property="sage" column="sage"/>
         <association property="address" javaType="Address">
             <result property="id" column="id"/>
             <result property="sheng" column="sheng"/>
             <result property="shi" column="shi"/>
             <result property="qu" column="qu"/>
         </association>
     </resultMap>  -->
     <!-- 第四種 -->
     <resultMap type="Student" id="StudentResult">
         <id property="sno" column="sno"/>
         <result property="sname" column="sname"/>
         <result property="sage" column="sage"/>
         <association property="address" column="addressID" select="com.imis.mappers.AddressMapper.findByID"></association>
     </resultMap>
     <select id="findStudentWithAddress" resultMap="StudentResult" parameterType="Integer">
         select * from student t1,address t2 where t1.addressId=t2.id and t1.sno=#{sno}
     </select>
     
     <insert id="add" parameterType="Student" >
         insert into student values(null,#{sname},#{sage},#{addressID})
     </insert>    
     <update id="update" parameterType="Student">
         update student set sname=#{sname},sage=#{sage},addresssID=#{addressID} where sno=#{sno}
     </update>
     <delete id="delete" parameterType="Integer">
         delete from student where sno=#{sno}
     </delete>
     <select id="findById" parameterType="Integer" resultType="Student">
         select * from student where sno=#{sno}
     </select>
     <select id="find" resultMap="StudentResult">
         select * from student
     </select>
 </mapper>

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StudentMapper.java文件

import java.util.List;

import com.imis.model.Student;

public interface StudentMapper {
    public int add(Student student) ;
    public int update(Student student);
    public int delete(int sno);
    public Student findById(int sno);
    public List<Student> find();
    public Student findStudentWithAddress(int sno);
}

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AddressMapper.xml

<?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.imis.mappers.AddressMapper">
     
     <resultMap type="Address" id="AddressResult">
         <result property="id" column="id"/>
         <result property="sheng" column="sheng"/>
         <result property="shi" column="shi"/>
         <result property="qu" column="qu"/>
     </resultMap>
    

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AddressMapper.java

import com.imis.model.Address;

public interface AddressMapper {
    
    public Address findByID(int id);

}

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import org.apache.ibatis.session.SqlSession;
import org.apache.log4j.Logger;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;

import com.imis.mappers.StudentMapper;
import com.imis.model.Student;
import com.imis.util.SqlSessionFactoryUtil;

public class StudentTest3 {
    private static Logger logger=Logger.getLogger(StudentTest2.class);
    private SqlSession sqlSession=null;
    private StudentMapper studentMapper=null;
    @Before
    public void setUp() throws Exception {
        sqlSession=SqlSessionFactoryUtil.openSession();
        studentMapper=sqlSession.getMapper(StudentMapper.class);
    }

    @After
    public void tearDown() throws Exception {
        sqlSession.close();
    }

    @Test
    public void testFindStudentWithAdress() {
        logger.info("查詢學生（帶地址）");
        Student student=studentMapper.findStudentWithAddress(1);
        System.out.println(student);
        System.out.println("1");
        
    }

}

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Model

public class Student {
    private int sno;
    private String sname;
    private int sage;
    private Address address;
    public Student() {
        super();
    }
    
    public Student(int sno, String sname, int sage) {
        super();
        this.sno = sno;
        this.sname = sname;
        this.sage = sage;
    }

    public Student(String sname, int sage) {
        super();
        this.sname = sname;
        this.sage = sage;
    }

    public int getSno() {
        return sno;
    }
    public void setSno(int sno) {
        this.sno = sno;
    }
    public String getSname() {
        return sname;
    }
    public void setSname(String sname) {
        this.sname = sname;
    }
    public int getSage() {
        return sage;
    }
    public void setSage(int sage) {
        this.sage = sage;
    }

    

    @Override
    public String toString() {
        return "Student [sno=" + sno + ", sname=" + sname + ", sage=" + sage + ", address=" + address + "]";
    }

    public Address getAddress() {
        return address;
    }

    public void setAddress(Address address) {
        this.address = address;
    }
    
}

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public class Address {

    private int id;
    private String sheng;
    private String shi;
    private String qu;
    
    public Address() {
        super();
    }
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public String getSheng() {
        return sheng;
    }
    public void setSheng(String sheng) {
        this.sheng = sheng;
    }
    public String getShi() {
        return shi;
    }
    public void setShi(String shi) {
        this.shi = shi;
    }
    public String getQu() {
        return qu;
    }
    public void setQu(String qu) {
        this.qu = qu;
    }
    @Override
    public String toString() {
        return "Address [id=" + id + ", sheng=" + sheng + ", shi=" + shi + ", qu=" + qu + "]";
    }
    
}

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測試

import org.apache.ibatis.session.SqlSession;
import org.apache.log4j.Logger;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;

import com.imis.mappers.StudentMapper;
import com.imis.model.Student;
import com.imis.util.SqlSessionFactoryUtil;

public class StudentTest3 {
    private static Logger logger=Logger.getLogger(StudentTest2.class);
    private SqlSession sqlSession=null;
    private StudentMapper studentMapper=null;
    @Before
    public void setUp() throws Exception {
        sqlSession=SqlSessionFactoryUtil.openSession();
        studentMapper=sqlSession.getMapper(StudentMapper.class);
    }

    @After
    public void tearDown() throws Exception {
        sqlSession.close();
    }

    @Test
    public void testFindStudentWithAdress() {
        logger.info("查詢學生（帶地址）");
        Student student=studentMapper.findStudentWithAddress(1);
        System.out.println(student);
    }

}