backend_dormitory/src/main/resources/mapper/template/WelcomeVisitorMapper.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.template.mapper.WelcomeVisitorMapper">

    <select id="countTotal" resultType="java.lang.Integer">
        SELECT
        COUNT( id )
        FROM
        welcome_visitor
        WHERE
        deleted = 0
        AND start_time >= #{start}
        AND #{end} >= end_time
        AND school_id = #{schoolId}
        AND create_time between #{nstartTime} and #{nendTime}
    </select>
</mapper>