xm/src/main/resources/mapper/TeachersMapper.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.zhentao.mapper.TeachersMapper">

    <resultMap id="BaseResultMap" type="com.zhentao.pojo.Teachers">
            <id property="teacherId" column="teacher_id" jdbcType="BIGINT"/>
            <result property="teacherName" column="teacher_name" jdbcType="VARCHAR"/>
            <result property="introduction" column="introduction" jdbcType="VARCHAR"/>
            <result property="createdAt" column="created_at" jdbcType="TIMESTAMP"/>
            <result property="updatedAt" column="updated_at" jdbcType="TIMESTAMP"/>
    </resultMap>

    <sql id="Base_Column_List">
        teacher_id,teacher_name,introduction,
        created_at,updated_at
    </sql>
</mapper>