Mybatis之配置文件

Posted 2020-11-28 Wu培培

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>