1.修改sql

cjy-project/src/main/resources/mapper/environmentdata/EnvironmentDataMapper.xml

@@ -158,7 +158,7 @@ PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
     </select>
     <select id="getTemperatureTrend" resultType="com.cjy.iot.domain.StatisticsDataEntity">
         SELECT
-            realtime_temperatures as total ,statistics_date as date
+            CAST( realtime_temperatures AS UNSIGNED)  as total ,statistics_date as date
         FROM
         d_environment_data
         WHERE statistics_date >= DATE_SUB(CURDATE(), INTERVAL 6 DAY)
@@ -168,7 +168,7 @@ PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
 
     <select id="getRainfall" resultType="com.cjy.iot.domain.StatisticsDataEntity">
         SELECT
-            rainfall as total ,statistics_date as date
+            CAST(rainfall AS UNSIGNED)  as total ,statistics_date as date
         FROM
         d_environment_data
         WHERE statistics_date >= DATE_SUB(CURDATE(), INTERVAL 6 DAY)