diff --git a/tests/examples/JDBC/springbootdemo/src/main/java/com/taosdata/example/springbootdemo/dao/WeatherMapper.xml b/tests/examples/JDBC/springbootdemo/src/main/java/com/taosdata/example/springbootdemo/dao/WeatherMapper.xml
index e8647826df..bdf83a77f6 100644
--- a/tests/examples/JDBC/springbootdemo/src/main/java/com/taosdata/example/springbootdemo/dao/WeatherMapper.xml
+++ b/tests/examples/JDBC/springbootdemo/src/main/java/com/taosdata/example/springbootdemo/dao/WeatherMapper.xml
@@ -39,7 +39,7 @@
         insert into test.t#{groupId} (ts, temperature, humidity) values (#{ts}, ${temperature}, ${humidity})
     </insert>
 
-    <select id="getSubTables">
+    <select id="getSubTables" resultType="String">
         select tbname from test.weather
     </select>