mybatis 使用接口增删改查和两表一对一关联查询

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"/>
     <typeAliases>
         <package name="com.model"/>
     </typeAliases>
     <environments default="test">
         <environment id="test">
            <transactionManager type="JDBC"/>
             <dataSource type="POOLED">
                <property name="driver" value="${driver}"/>
                <property name="url" value="${jdbcUrl}"/>
                <property name="username" value="${username}"/>
                <property name="password" value="${password}"/>
              </dataSource>
         </environment>
     </environments>

 <mappers>
     <package name="com.dao"/><!-- 自动装配包里的接口 -->
 </mappers>

 </configuration>

driver=oracle.jdbc.OracleDriver
jdbcUrl=jdbc:oracle:thin:@localhost::orcl
username=test1116
password=

数据库

 

两个实体类

package com.model;

import java.util.Date;

public class Student {
    private Integer sno;
    private String sname;
    private String ssex;
    private Integer sclass;

    public Student() {
        super();
    }

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

    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;
    }

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

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

}

package com.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 com.dao;

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

import com.model.Student;

public interface StudentMapper {
    /**
     * 添加
     */
    public Integer add(Student student);
    /**
     * 删除
     */
    public Integer delete(Integer son);
    /**
     * 修改
     */
    public Integer update(Student student);
    /**
     * 根据主键查查询
     */
    public Student select(Integer sno);
    /**
     * 全表查询
     */
    public List<Student> selectall();
    /**
     * 多条件查询
     */
    public List<Student> selectduo(Map<String, Object> map);
}

package com.dao;

import java.util.List;

import com.model.StudentInfo;

public interface StudentInfoMapper {
    /**
     * 一对一关联查询
     * @return
     */
    public List<StudentInfo> selectall();
}

对应的两个配置文件，注意接口名要跟实配置文件名字一样，相当与实现了接口

<?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.dao.StudentMapper">
     <!-- 添加 -->
    <insert id="add" parameterType="student">
        insert into student values(#{sno},#{sname},#{ssex},#{sclass})
    </insert>
    <!-- 删除  -->
    <delete id="delete" parameterType="Integer">
        delete student s where s.sno=#{sno}
    </delete>
    <!-- 修改 -->
    <update id="update" parameterType="student">
        update student s set s.sname=#{sname},s.ssex=#{ssex},s.sclass=#{sclass} where s.sno=#{sno}
    </update>
    <!-- 根据主键查 -->
    <select id="select" parameterType="Integer" resultType="student">
        select * from student s where s.sno=#{sno}
    </select>
    <!-- 查全部 -->
    <select id="selectall" resultType="student" >
        select * from student
    </select>
    <!-- 多条件查询 -->
    <select id="selectduo" parameterType="Map" resultType="student" >
        select * from student s where s.sno=#{sno} and s.sname like #{sname}
    </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.dao.StudentInfoMapper">
     <!-- 一对一关联查询 -->
     <resultMap type="studentInfo" id="silist">
         <result 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="saddress" column="saddress"/>
         <result property="sbirthday" column="sbirthday"/>
     </resultMap>
     <!-- 一对一另一种方法 -->
     <resultMap type="StudentInfo" id="silist1">
         <association property="student" column="sno" select="com.dao.StudentMapper.select"/>
     </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 com.util;

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 SqlSessionUtil {
    private static SqlSessionFactory ssf;
    private static SqlSession ss;

    public static SqlSessionFactory getSqlSessionFactory(){
        InputStream in=null;
        try {
            in=Resources.getResourceAsStream("mybatis-cfg.xml");
            ssf=new SqlSessionFactoryBuilder().build(in);
            in.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return ssf;
    }
    public static SqlSession getSqlSession(){
        ss=getSqlSessionFactory().openSession();
        return ss;
    }
    public static void main(String[] args) {
        System.out.println(getSqlSession());
    }

}

第一个junit测试

package com.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 com.dao.StudentMapper;
import com.model.Student;

public class Jtest {
    private SqlSession ss;
    private StudentMapper sm;
    @Before
    public void setUp() throws Exception {
        ss=SqlSessionUtil.getSqlSession();
        sm=ss.getMapper(StudentMapper.class);

    }

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

    public void test() {
        Student st=new Student(6, "蒙蒙", "男", 95031);
        int m=sm.add(st);
        System.out.println(m);
    }
    public void delete() {
        int m=sm.delete(6);
        System.out.println(m);
    }
    public void update() {
        Student st=new Student(666, "张三", "男", 95033);
        int m=sm.update(st);
        System.out.println(m);
    }
    public void select() {
        Student st=sm.select(3);
        System.out.println(st);
    }
    public void selectall() {
        List<Student> st=sm.selectall();
        for(Student tt:st){
            System.out.println(tt);
        }
    }
    @Test
    public void selectduo() {
        Map<String, Object> map=new HashMap<String, Object>();
        map.put("sno", 666);
        map.put("sname", "%张%");
        List<Student> st=sm.selectduo(map);
        for(Student tt:st){
            System.out.println(tt);
        }
    }

}

第二个junit测试

package com.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 com.dao.StudentInfoMapper;
import com.dao.StudentMapper;
import com.model.StudentInfo;

public class JJtest {
    private SqlSession ss;
    private StudentInfoMapper sim;
    @Before
    public void setUp() throws Exception {
        ss=SqlSessionUtil.getSqlSession();
        sim=ss.getMapper(StudentInfoMapper.class);

    }

    @After
    public void tearDown() throws Exception {
        ss.commit();
        ss.close();
    }
    @Test
    public void test() {
        List<StudentInfo> list=sim.selectall();
        for(StudentInfo a:list){
            System.out.println(a);
        }
    }

}

多条件查询结果，其它的就不发了