NewsLabelsMapper.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.laowu.mapper.NewsLabelsMapper">

    <!-- 通用查询映射结果 -->
    <resultMap id="BaseResultMap" type="com.laowu.model.NewsLabelsDO">
        <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="news_id" property="newsId" />
        <result column="label_id" property="labelId" />
    </resultMap>

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

    <select id="labelIds" parameterType="long" resultType="long">
        SELECT
            t.label_id
        FROM
            news_labels t
        WHERE
            t.delete_date IS NULL
            AND t.news_id = #{newsId}
    </select>

</mapper>