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wms-module-system/src/main/resources/mapper/MessageUserMapper.xml

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+<?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.ysoft.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 = false
+        <if test="type != null">
+            AND t2.type = #{type}
+        </if>
+    </select>
+</mapper>