mybatis所需pom文件内容以及配置文件

官方网站http://www.mybatis.org/mybatis-3/zh/index.html
pom文件
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.yujian</groupId>
    <artifactId>mybatisdemo3</artifactId>
    <version>1.0-SNAPSHOT</version>
    <dependencies>
        <!-- https://mvnrepository.com/artifact/junit/junit -->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
            <scope>test</scope>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.mybatis/mybatis -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.4.6</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.47</version>
        </dependency>

    </dependencies>
    <!--下面是防止src/main/java下面的东西无法加载到resources下面（若是把db.properties和mybatis-config.xml直接放在resources下面，则不需要）-->
    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-jar-plugin</artifactId>
                <configuration>
                    <skip>true</skip>
                </configuration>
            </plugin>
        </plugins>
        <resources>
            <resource>
                <directory>src/main/java</directory>
                <includes>
                    <include>**/*.xml</include>
                    <include>**/*.properties</include>
                </includes>
            </resource>
            <resource>
                <directory>src/main/resources</directory>
                <includes>
                    <include>**/*</include>
                </includes>
            </resource>
        </resources>
    </build>
</project>

mybatis-config.xml

<?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>
    <!--导入参数来源-->
    <settings>
            <setting name="logImpl" value="STDOUT_LOGGING"/>
        <!--用于生成可视的sql命令-->
        <setting name="mapUnderscoreToCamelCase" value="true"/>
    </settings><!--配置驼峰命名法必须在properties后面，有顺序，ctr然后点configuration查看顺序-->
    <typeAliases>
        <!--<typeAlias type="com.yujian.pojo.Student" alias="s2"></typeAlias>-->
        <!--如果用上面这种，则每个pojo里面的类都需要加入进来写别名-->
        <package name="com.yujian.pojo"></package>
        <!--如果上面这种，则自动扫描包pojo下的注解类的别名-->
    </typeAliases>
    <!--environments可以写多个，然后通过写id，在StudentMapper.xml下的sql语句中
    加入大baseid即如：<select id="findeStudentList" resultMap="r1" databaseId="development">
    select * from student ;
</select>-->
    <environments default="development">
        <environment id="development"><!--环境-->
            <transactionManager type="JDBC"/><!--事务管理器-->
            <dataSource type="POOLED"><!--数据源-->
                <property name="driver" value="${mysql.driver}"/>
                <property name="url" value="${mysql.url}"/>
                <property name="username" value="${mysql.username}"/>
                <property name="password" value="${mysql.password}"/>
            </dataSource>
        </environment>
    </environments>
    <mappers>
        <!--<mapper resource="com/yujian/model/StudentMapper.xml"/>
        <mapper resource="com/yujian/model/ClassInfoMapper.xml"/>-->
        <!--设置反射来源-->
        <!--或者用下面这种，可以自动查询包下所有文件-->
        <package name="com.yujian.model"></package>
        <!--<mapper class="com.yujian.model.StudentMapper"></mapper>这种也可以-->
    </mappers>
</configuration>

db.properties

#mysql
mysql.driver=com.mysql.jdbc.Driver
mysql.url=jdbc:mysql://localhost:3306/school?useSSL=false
mysql.username=root
mysql.password=root

MybatisHelper.class

package com.yujian.util;

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

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

public class MybatisHelper {
    private static SqlSessionFactory sqlSessionFactory=null;
    public static SqlSessionFactory getSqlSessionFactory(){
        if(sqlSessionFactory==null) {
            try {
                /*InputStream inputStream = Resources.getResourceAsStream("mybatis-config.xml");
                sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);*/
                InputStream inputStream=Resources.getResourceAsStream("mybatis-config.xml");
                sqlSessionFactory=new SqlSessionFactoryBuilder().build(inputStream);
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return sqlSessionFactory;
    }
}

studentsMapper.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.yujian.model.StudentMapper">
    <!--<select id="findeStudentList" resultType="com.yujian.pojo.Student">
        select * from student ;
    </select>-->
    <resultMap id="r1" type="s2">
       <!-- <id property="" column="" />-->
        <!--<result column="stuid" property="stuId"/>-->
        <!--上面的type=或者可以用注解的别名-->
        <!--两种方法type="com.yujian.pojo.Student"一般用这种-->
        <!--如果属性名和列的字段名不匹配，通过resultmap可以属性和字段进行匹配-->
        <result column="stuName" property="stuName1"></result>
        <result column="classid" property="classInfo.classId"></result>
        <result property="classInfo.className" column="classname"/>
    </resultMap>
    <!--如果使用association标签，name其他映射会失效，需要加上automapping=true-->
    <resultMap id="r2" type="com.yujian.pojo.Student" autoMapping="true">
        <result column="stuName" property="stuName1"></result>
        <!--<association property="classInfo" javaType="com.yujian.pojo.ClassInfo">
            <result column="classid" property="classId"></result>
            <result column="classname" property="className"></result>
        </association>-->
        <!--或者下面这种-->
        <association property="classInfo" javaType="com.yujian.pojo.ClassInfo"
         select="com.yujian.model.ClassInfoMapper.findListClassInfoById" column="classid">
        </association>
    </resultMap>
    <select id="findAssoListStudent" resultMap="r2">
        select s.*,c.* from student s inner join classinfo c on s.classId=c.classId ;
    </select>

    <!--下面如果用resultType="s2"或者"com.yujian.pojo.Student"，则会造成属性名和列字段名不匹配，找不到-->
    <!--<select id="findeStudentList" resultMap="r1">
        select s.*,c.* from student s inner join classinfo c on s.classId=c.classId ;
    </select>-->
    <!--<select id="findStudentById" resultMap="r1" parameterType="int">
                select s.*,c.* from student s inner join classinfo c on s.classId=c.classId where stuid=#{stuId};
    </select>-->
    <insert id="insertStudent" parameterType="com.yujian.pojo.Student">
        insert  into student(stuId,stuName,stuSex,stuBirth,classId) values (null ,#{stuName1},#{stuSex},now(),#{classInfo.classId});
    </insert>
    <update id="updateStudent" parameterType="com.yujian.pojo.Student">
        update student set stuName=#{stuName1},stuSex=#{stuSex},classId=#{classInfo.classId},stuBirth=#{stuBirth} where stuId=#{stuId};
    </update>
    <delete id="deleteStudent" parameterType="int">
        delete from student where stuId=#{stuId};
    </delete>
    <!--<resultMap id="result" type="com.yujian.pojo.Student">
        <result column="stuname" property="stuName1"></result>
    </resultMap>
    <select id="findStuLike" resultMap="result">
        select * from student where stuName like #{param1} and stuSex like #{param2} and stuId=#{param3}
    </select>-->
    <resultMap id="result" type="com.yujian.pojo.Student">
        <result column="stuname" property="stuName1"></result>
    </resultMap>
    <select id="findStuMap" resultMap="result">
        select * from student where stuName like #{stuName} and stuSex like #{stuSex} and stuId=#{stuId}
    </select>

</mapper>

StudentMapper.class

package com.yujian.model;

import com.yujian.pojo.Student;
import org.apache.ibatis.annotations.*;

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

public interface StudentMapper {
    @Select("select s.*,c.* from student s inner join classinfo c on s.classid=c.classid")
    @Results(id = "student",value = {
            @Result(column = "stuName",property = "stuName1"),
            /*@Result(column = "classId",property = "classInfo.classId"),
            @Result(column = "className",property = "classInfo.className"),*/
            @Result(property = "classInfo",column = "classId",one=@One(select = "com.yujian.model.ClassInfoMapper.findListClassInfoById"))
           /* @Result(column = "stuId",property = "stuId"),
            @Result(column = "stuBirth",property = "stuBirth"),
            @Result(column = "stuSex",property = "stuSex")
            列不需要字段写全，只要不同名字段属性，给一一匹配就好
            */

    })
    List<Student> findeStudentList();
    @Select("select s.*,c.* from student s inner join classinfo c on s.classid=c.classid")
    @Results(id = "student2",value = {
           @Result(column = "stuName",property = "stuName1"),
           @Result(column = "className",property = "classInfo.className") ,
            @Result(column = "classId",property = "classInfo.classId")
    })
    List<Student> findStudentList();
    @Select("select s.*,c.* from student s inner join classinfo c on s.classid=c.classid" +
            " where s.stuid=#{stuId}")
    /*@ResultMap("com.yujian.model.StudentMapper.r1")*/
    @ResultMap("student2")

    Student findStudentById(int stuId);
    void insertStudent(Student student);
    void updateStudent(Student student);
    void deleteStudent(int stuId);
    @Select("select s.*,c.* from student s inner join classinfo c on s.classid=c.classid" +
            " where s.classId=#{classId}")
    /*@ResultMap("com.yujian.model.StudentMapper.r1")*/
    /*@Results({
            @Result(column = "stuName",property = "stuName1")
    })*/
    @Results(id = "student3",value = {
            @Result(column = "stuName",property = "stuName1"),
            @Result(column = "className",property = "classInfo.className") ,
            @Result(column = "classId",property = "classInfo.classId")
    })
    List<Student> findStudentListByClassId(int classId);
    List<Student> findAssoListStudent();
    @Select("select * from student where stuName like #{stuName} and stuSex like #{stuSex} and stuId=#{stuId}")
    @Results({
            @Result(column = "stuName",property = "stuName1")
    })
    List<Student> findStuLike(@Param("stuName") String stuName,@Param("stuSex") String stuSex,@Param("stuId") int stuId);
    List<Student> findStuMap(Map map);
    @Select("select * from student where stuName like #{param1} and stuSex like #{param2} and stuId=#{param3}")
    @Results({
            @Result(column = "stuName",property = "stuName1")
    })
    List<Student> findStuLike2(String stuName,String stuSex,int stuId);
}

测试文件

import com.yujian.model.ClassInfoMapper;
import com.yujian.model.StudentMapper;
import com.yujian.pojo.ClassInfo;
import com.yujian.pojo.Student;
import com.yujian.util.Dateformat;
import com.yujian.util.MybatisHelper;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.junit.Test;

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

public class StudentTest {
    @Test
    public void testFindStudentList(){
        SqlSessionFactory sqlSessionFactory=MybatisHelper.getSqlSessionFactory();

        SqlSession sqlSession=sqlSessionFactory.openSession();
        try {
            StudentMapper studentMapper=sqlSession.getMapper(StudentMapper.class);
            List<Student> students=studentMapper.findeStudentList();
            System.out.println(students.size());
            System.out.println(students.get(0).getStuName1());
            System.out.println(students.get(0).getClassInfo().getClassName());
            System.out.println(students.get(0).getStuSex());

            /*sqlSession.commit();*/
           /* sqlSession.rollback();*/
        } catch (Exception e) {
            e.printStackTrace();
            sqlSession.rollback();
        } finally {
            sqlSession.close();
        }
    }
    @Test
    public void testFindStudent(){
        SqlSessionFactory sqlSessionFactory=MybatisHelper.getSqlSessionFactory();
        SqlSession sqlSession=sqlSessionFactory.openSession();
        StudentMapper studentMapper=sqlSession.getMapper(StudentMapper.class);
        try {
            Student student=studentMapper.findStudentById(2);
            System.out.println(student.getClassInfo().getClassName());
        } catch (Exception e) {
            e.printStackTrace();
            sqlSession.rollback();
        } finally {
            sqlSession.close();
        }
    }
    @Test
    public void testinsertStudent(){
        SqlSessionFactory sqlSessionFactory=MybatisHelper.getSqlSessionFactory();
        SqlSession sqlSession=sqlSessionFactory.openSession();

        StudentMapper studentMapper=sqlSession.getMapper(StudentMapper.class);
        ClassInfoMapper classInfoMapper=sqlSession.getMapper(ClassInfoMapper.class);

        try {
            Student student=new Student();
            student.setStuName1("李四");
            student.setStuSex(1);
            ClassInfo classInfo=null;
            classInfo=classInfoMapper.findListClassInfoById(1);
            student.setClassInfo(classInfo);

            studentMapper.insertStudent(student);
            sqlSession.commit();
        } catch (Exception e) {
            e.printStackTrace();
            sqlSession.rollback();
        } finally {
            sqlSession.close();
        }

    }
    @Test
    public void testupdateStudent(){
        SqlSessionFactory sqlSessionFactory=MybatisHelper.getSqlSessionFactory();
        SqlSession sqlSession=sqlSessionFactory.openSession();

        StudentMapper studentMapper=sqlSession.getMapper(StudentMapper.class);
        ClassInfoMapper classInfoMapper=sqlSession.getMapper(ClassInfoMapper.class);
        Dateformat format=new Dateformat();

        try {
            Student student=studentMapper.findStudentById(2);
            student.setStuName1("王五");
            student.setStuSex(0);
            String birth="1997-03-30";
            student.setStuBirth(format.format(birth));
            ClassInfo classInfo=null;
            classInfo=classInfoMapper.findListClassInfoById(2);
            student.setClassInfo(classInfo);

            studentMapper.updateStudent(student);
            sqlSession.commit();

        } catch (Exception e) {
            e.printStackTrace();
            sqlSession.rollback();
        } finally {
            sqlSession.close();
        }
    }
    @Test
    public void testDeleteStudent(){
        SqlSessionFactory sqlSessionFactory=MybatisHelper.getSqlSessionFactory();
        SqlSession sqlSession=sqlSessionFactory.openSession();
        StudentMapper studentMapper=sqlSession.getMapper(StudentMapper.class);

        try {
            studentMapper.deleteStudent(3);
            sqlSession.commit();
        } catch (Exception e) {
            e.printStackTrace();
            sqlSession.rollback();
        } finally {
            sqlSession.close();
        }

    }
    @Test
    public void testfindStudentListByClassId(){
        SqlSessionFactory sqlSessionFactory=MybatisHelper.getSqlSessionFactory();
        SqlSession sqlSession=sqlSessionFactory.openSession();
        StudentMapper studentMapper=sqlSession.getMapper(StudentMapper.class);

        try {
            List<Student> students=studentMapper.findStudentListByClassId(1);
            System.out.println(students.get(0).getClassInfo().getClassName());
            System.out.println(students.get(0).getStuName1());
            sqlSession.commit();
        } catch (Exception e) {
            e.printStackTrace();
            sqlSession.rollback();
        } finally {
            sqlSession.close();
        }

    }
    @Test
    public void testFindAssoListStudent(){

        SqlSessionFactory sqlSessionFactory=MybatisHelper.getSqlSessionFactory();

        SqlSession sqlSession=sqlSessionFactory.openSession();
        try {
            StudentMapper studentMapper=sqlSession.getMapper(StudentMapper.class);
            List<Student> students=studentMapper.findAssoListStudent();
            System.out.println(students.size());
            System.out.println(students.get(0).getStuName1());
            System.out.println(students.get(0).getClassInfo().getClassName());
            System.out.println(students.get(0).getStuSex());

            /*sqlSession.commit();*/
            /* sqlSession.rollback();*/
        } catch (Exception e) {
            e.printStackTrace();
            sqlSession.rollback();
        } finally {
            sqlSession.close();
        }
    }
    @Test
    public void testListLikeStu(){
        SqlSession sqlSession=MybatisHelper.getSqlSessionFactory().openSession();
        try {
            StudentMapper studentMapper=sqlSession.getMapper(StudentMapper.class);

            List<Student> students=studentMapper.findStuLike("张%","1",1);
            for (Student s:students){
                System.out.println(s.getStuName1());
            }
        } catch (Exception e) {
            e.printStackTrace();
            sqlSession.rollback();
        } finally {
            sqlSession.close();
        }
    }@Test
    public void testListMapStu(){
        SqlSession sqlSession=MybatisHelper.getSqlSessionFactory().openSession();
        try {
            StudentMapper studentMapper=sqlSession.getMapper(StudentMapper.class);
            Map<String,Object> map=new HashMap<String, Object>();
            map.put("stuName","张%");
            map.put("stuSex","1");
            map.put("stuId",1);
            List<Student> students=studentMapper.findStuMap(map);
            for (Student s:students){
                System.out.println(s.getStuName1());
            }
        } catch (Exception e) {
            e.printStackTrace();
            sqlSession.rollback();
        } finally {
            sqlSession.close();
        }
    }
    @Test
    public void testListLikeStu2(){
        SqlSession sqlSession=MybatisHelper.getSqlSessionFactory().openSession();
        try {
            StudentMapper studentMapper=sqlSession.getMapper(StudentMapper.class);

            List<Student> students=studentMapper.findStuLike2("张%","1",1);
            for (Student s:students){
                System.out.println(s.getStuName1());
            }
        } catch (Exception e) {
            e.printStackTrace();
            sqlSession.rollback();
        } finally {
            sqlSession.close();
        }
    }
}