estateagents/src/main/resources/mapper/TaCheckinMapper.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.huiju.estateagents.entity.TaCheckin">
    <select id="getUndisplayedCustomerList" resultType="com.huiju.estateagents.entity.TaCheckin">
        SELECT
        *
        FROM
        ta_checkin
        WHERE
        STATUS &lt; 1
        AND activity = #{activity}
    </select>

    <select id="isCustomerChecked" resultType="int">
        SELECT
        count(1)
        FROM
        ta_checkin
        WHERE
        activity = #{activity}
        AND person_id = #{personId}
    </select>

</mapper>