CourseContentMapper.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.subsidy.mapper.CourseContentMapper">

    <!-- 通用查询映射结果 -->
    <resultMap id="BaseResultMap" type="com.subsidy.model.CourseContentDO">
        <id column="id" property="id" />
        <result column="create_date" property="createDate" />
        <result column="update_date" property="updateDate" />
        <result column="delete_date" property="deleteDate" />
        <result column="course_id" property="courseId" />
        <result column="content" property="content" />
        <result column="order_no" property="orderNo" />
    </resultMap>

    <!-- 通用查询结果列 -->
    <sql id="Base_Column_List">
        create_date,
        update_date,
        delete_date,
        id, course_id, content, order_no
    </sql>

    <select id="getCourseVods" parameterType="integer" resultType="com.subsidy.model.VodDictDO">
        SELECT
           t2.id,
            t2.content_id,
            t2.vod_name,
            t2.vod_length,
            t2.vod_type,
            t2.vod_size,
            t2.vod_url,
            t2.vod_code,
            t2.teacher_name,
            t2.cover_page
        FROM
            course_content t
            LEFT JOIN vod_dict t2 ON t.id = t2.content_id
        WHERE
            t.delete_date IS NULL
            AND t2.delete_date IS NULL
            and t.course_id = #{courseId}
            and t2.id is  not null
    </select>

</mapper>