修改bug

amos-boot-system-equip/src/main/resources/mapper/FireFightingSystemMapper.xml

@@ -5971,8 +5971,8 @@
     <select id="selectCarStats" resultType="java.util.Map">
         SELECT
             COUNT(*) AS totalCount,
-            SUM(CASE WHEN wc.equip_status = 1 then 1 else 0 end ) AS yellowCodeCount,
-            SUM(CASE WHEN wc.equip_status = 2 then 1 else 0 end ) AS redCodeCount
+            IFNULL(SUM(CASE WHEN wc.equip_status = 1 then 1 else 0 end ), 0) AS yellowCodeCount,
+            IFNULL(SUM(CASE WHEN wc.equip_status = 2 then 1 else 0 end ), 0) AS redCodeCount
         FROM
             wl_car wc
             LEFT JOIN wl_equipment wle ON wle.id = wc.equipment_id