<?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="top.charles7c.continew.admin.system.mapper.MessageUserMapper">
    <select id="selectUnreadCountByUserIdAndType" resultType="Long">
        SELECT
            COUNT(t1.`message_id`)
        FROM `sys_message_user` AS t1
            LEFT JOIN `sys_message` AS t2 ON t2.`id` = t1.`message_id`
        WHERE t1.`user_id` = #{userId} AND t1.`is_read` = 0
        <if test="type != null">
            AND t2.`type` = #{type}
        </if>
    </select>
</mapper>