Mybatis之配置文件

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>    <environments default="Mybatis_a">        <environment id="Mybatis_a">            <transactionManager type="jdbc"></transactionManager>            <dataSource type="pooled">                <property name="driver" value="com.mysql.cj.jdbc.Driver"/>                <property name="url" value="jdbc:mysql://localhost:3306/mybatis?serverTimezone=Asia/Shanghai&amp;useUnicode=true&amp;characterEncoding=utf8&amp;useSSL=true"/>                <property name="username" value="root"/>                <property name="password" value="wpy581"/>            </dataSource>        </environment>    </environments>    <!--注册-->    <mappers>        <mapper resource="cn/scitc/Mapper/StudentMapper.xml"/>        <mapper resource="cn/scitc/Mapper/TeacherMapper.xml"/>    </mappers></configuration>//StudentMapper.xml   以及一对多，多对一

<?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="cn.scitc.Mapper.StudentMapper">    <resultMap id="Student" type="cn.scitc.pojo.Student">        <result property="id" column="id"/>        <result property="name" column="name"/>        <association property="teacher" column="tid" select="TselectInfo" javaType="cn.scitc.pojo.Teacher"/>    </resultMap>    <select id="SelectInfo" resultMap="Student">        select * from student    </select>    <select id="TselectInfo" resultType="cn.scitc.pojo.Teacher">        select * from teacher where id = #{id}    </select>    <select id="SelectInfo1" resultMap="Student1">        select s.id sid,s.name sname,t.id tid,t.name tname from student s,teacher t where s.tid=t.id;    </select>    <resultMap id="Student1" type="cn.scitc.pojo.Student">        <result property="id" column="sid"/>        <result property="name" column="sname"/>        <association property="teacher" javaType="cn.scitc.pojo.Teacher">            <result property="name" column="tname"/>            <result property="id" column="tid"/>        </association>    </resultMap></mapper>