MyBatis 使用接口增删改查和两表一对一级联查询

Posted 2020-09-12 囧雪

 

导包

总配置文件

<?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>
      
      <properties resource="db.properties"></properties>
      
      <typeAliases>
          <package name="maya.model"/>
      </typeAliases>
      
      <environments default="development">
          <environment id="development">
              <transactionManager type="JDBC"></transactionManager>
              <dataSource type="POOLED">
                  <property name="driver" value="${driver}"/>
                  <property name="url" value="${url}"/>
                  <property name="username" value="${username}"/>
                  <property name="password" value="${password}"/>
              </dataSource>
          </environment>
          
      </environments>      
      <mappers><!--自动装备包里的接口-->
          <package name="maya.dao"/>
      </mappers>  
  </configuration>

driver=oracle.jdbc.OracleDriver
url=jdbc:oracle:thin:@localhost:1521:orcl
username=db
password=123

数据库

  两个实体类

package maya.model;

public class Student {
    private Integer sno;
    private String sname;
    private String ssex;
    private Integer sclass;
    private Integer mark;
    
    public Student() {
        super();
    }

    public Student(Integer sno, String sname, String ssex, Integer sclass, Integer mark) {
        super();
        this.sno = sno;
        this.sname = sname;
        this.ssex = ssex;
        this.sclass = sclass;
        this.mark = mark;
    }

    public Integer getSno() {
        return sno;
    }

    public void setSno(Integer sno) {
        this.sno = sno;
    }

    public String getSname() {
        return sname;
    }

    public void setSname(String sname) {
        this.sname = sname;
    }

    public String getSsex() {
        return ssex;
    }

    public void setSsex(String ssex) {
        this.ssex = ssex;
    }

    public Integer getSclass() {
        return sclass;
    }

    public void setSclass(Integer sclass) {
        this.sclass = sclass;
    }

    public Integer getMark() {
        return mark;
    }

    public void setMark(Integer mark) {
        this.mark = mark;
    }

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

package maya.model;

import java.util.Date;

public class StudentInfo {
    private Integer id;
    private Student student;
    private String saddress;
    private Date sbirthday;
    public StudentInfo() {
        super();
    }
    public StudentInfo(Integer id, Student student, String saddress, Date sbirthday) {
        super();
        this.id = id;
        this.student = student;
        this.saddress = saddress;
        this.sbirthday = sbirthday;
    }
    public Integer getId() {
        return id;
    }
    public void setId(Integer id) {
        this.id = id;
    }
    public Student getStudent() {
        return student;
    }
    public void setStudent(Student student) {
        this.student = student;
    }
    public String getSaddress() {
        return saddress;
    }
    public void setSaddress(String saddress) {
        this.saddress = saddress;
    }
    public Date getSbirthday() {
        return sbirthday;
    }
    public void setSbirthday(Date sbirthday) {
        this.sbirthday = sbirthday;
    }
    @Override
    public String toString() {
        return "StudentInfo [id=" + id + ", student=" + student + ", saddress=" + saddress + ", sbirthday=" + sbirthday
                + "]";
    }
}

两个接口

package maya.dao;

import java.util.List;
import java.util.Map;

import maya.model.Student;

/*
 * 学生信息操作接口
 */
public interface StudentMapper {
    /**
     * 添加一条学生信息
     * @param student
     * @return
     */
    public Integer addStu(Student stu);
    /**
     * 删除学生信息
     * @param stu
     * @return
     */    
    public Integer delStu(Integer sno);
    /**
     * map条件查询
     * @param map
     * @return
     */
    public List<Student> getStuByMap(Map<String, Object> map);
    /**
     * 查单条学生信息
     */
    public Student getStuBySno(Integer sno);
    /**
     * 修改学生信息
     */
    public Integer updateStu(Student stu);
}

 

package maya.dao;

import java.util.List;

import maya.model.StudentInfo;
/**
 * 学生记录的其他信息
 * @author User
 *
 */
public interface StudentInfoMapper {
    /**
     * 一对一级联查询
     * @return
     */
    public List<StudentInfo> selectAll();
}

 

对应的两个配置问文件，注意接口名要跟实配置文件名字一样

<?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="maya.dao.StudentMapper">
    <resultMap type="student" id="stuList"></resultMap>
    <!-- 添加 -->
    <insert id="addStu" parameterType="student">
        insert into student values(sq_mybatis.nextval,#{sname},#{ssex},#{sclass},#{mark})
    </insert>
    <!-- 多条件查询 -->
    <select id="getStuByMap" parameterType="Map" resultMap="stuList">
        select * from student s where s.sname like #{sname}
        and s.ssex=#{ssex}
    </select>
    <!-- 根据主键查询 -->
    <select id="getStuBySno" parameterType="Integer" resultType="student">
        select * from student s where s.sno=#{sno}
    </select>
    <!-- 删除 -->
    <delete id="delStu" parameterType="Integer">
        delete from student s where s.sno=#{sno} 
    </delete>
    <!-- 修改 -->
    <update id="updateStu" parameterType="student">
        update student s set s.sname=#{sname}, s.ssex=#{ssex}, s.sclass=#{sclass}, s.mark=#{mark}
        where s.sno=#{sno}
    </update>
</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="maya.dao.StudentInfoMapper">        
    <!-- 一对一级联查询 -->    
    <!-- 方法一 ：-->
    <resultMap type="studentInfo" id="siList">
        <id property="id" column="id"/>        
        <result property="student.sno" column="sno"/>
        <result property="student.sname" column="sname"/>
        <result property="student.ssex" column="ssex"/>
        <result property="student.sclass" column="sclass"/>
        <result property="student.mark" column="mark"/>        
        <result property="saddress" column="saddress"/>
        <result property="sbirthday" column="sbirthday"/>        
    </resultMap>
    <!-- 方法二：推荐 -->
    <resultMap type="studentInfo" id="siList1">
        <association property="student" column="sno" select="maya.dao.StudentMapper.getStuBySno"></association>
    </resultMap>
    
    <select id="selectAll" resultMap="siList1">
        select * from studentinfo si left join student s on si.sno=s.sno
    </select>
</mapper>

 sqlsession工具类

 

package maya.util;
/**
 * Mybatis工具类
 * @author User
 *
 */

import java.io.IOException;
import java.io.InputStream;

import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;

public class MybatisSqlSessionFactoryUtil {
    private static SqlSessionFactory ssf;
    private static SqlSession ss;
    /**
     * 获取Mybatis核心SqlSessionFactory
     */
    public static SqlSessionFactory getSqlSessionFactory() {
        InputStream in = null;
        try {
            in = Resources.getResourceAsStream("mybatis-config.xml");
            ssf = new SqlSessionFactoryBuilder().build(in);
            in.close();
        } catch (IOException e) {
            // TODO 自动生成的 catch 块
            e.printStackTrace();
        }
        return ssf;
    }
    /**
     * 获取SqlSession
     */
    public static SqlSession getSqlSession() {
        ss = getSqlSessionFactory().openSession();
        return ss;
    }
}

Stundent测试用例

 

package maya.util;

import static org.junit.Assert.*;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

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

import maya.dao.StudentMapper;
import maya.model.Student;

public class StudentJUnit {
    private SqlSession ss;
    private StudentMapper sm;

    
    public void addStutest() {
        /*Student s = new Student();
        s.setSname("巨魔战将");
        s.setSsex("男");
        s.setSclass(0402);
        s.setMark(25);
        int i = ss.insert("maya.dao.StudentMapper.addStu",s);    */
        Student s = new Student(null,"qq","男",2,55);
        int i = sm.addStu(s);
    }
    @Test
    public void getStuMany() {
        Map<String, Object> map = new HashMap<String,Object>();
        map.put("ssex", "女");
        map.put("sname", "风行%");
        List<Student> list = sm.getStuByMap(map);
        for (Student s : list) {
            System.out.println(s);
        }
    }
    
    public void delStu() {
        int i = sm.delStu(19);
    }
    
    public void updateStu() {
        Student s = new Student(18,"董小姐","女",403,27);
        
        sm.updateStu(s);
        System.out.println(s);
    }
    
    public void getStuOne() {
        Student s = sm.getStuBySno(14);
        System.out.println(s);
    }
    @Before
    public void setUp() throws Exception {
        ss = MybatisSqlSessionFactoryUtil.getSqlSession();
        sm = ss.getMapper(StudentMapper.class);
    }

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

}

StundentInfo测试用例 

package maya.util;

import static org.junit.Assert.*;

import java.util.List;

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

import maya.dao.StudentInfoMapper;
import maya.model.StudentInfo;

public class StudentInfoJUnit {
    private SqlSession ss;
    private StudentInfoMapper sim;
    
    @Test
    public void test() {
        List<StudentInfo> list = sim.selectAll();
        for (StudentInfo si : list) {
            System.out.println(si);
        }
    }

    
    
    @Before
    public void setUp() throws Exception {
        ss = MybatisSqlSessionFactoryUtil.getSqlSession();
        sim = ss.getMapper(StudentInfoMapper.class);
    }

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

 

多条件查询结果：

StudentInfo [id=1, student=Student [sno=14, sname=敌法师, ssex=男, sclass=403, mark=23], saddress=近卫, sbirthday=Thu Apr 20 00:00:00 CST 2017]
StudentInfo [id=2, student=Student [sno=16, sname=痛苦女王, ssex=女, sclass=402, mark=21], saddress=天灾, sbirthday=Wed Apr 19 00:00:00 CST 2017]