diff --git a/tests/examples/JDBC/taosdemo/src/main/java/com/taosdata/taosdemo/dao/DatabaseMapperImpl.java b/tests/examples/JDBC/taosdemo/src/main/java/com/taosdata/taosdemo/dao/DatabaseMapperImpl.java
index e0a2f77a83..b6d53690e4 100644
--- a/tests/examples/JDBC/taosdemo/src/main/java/com/taosdata/taosdemo/dao/DatabaseMapperImpl.java
+++ b/tests/examples/JDBC/taosdemo/src/main/java/com/taosdata/taosdemo/dao/DatabaseMapperImpl.java
@@ -22,7 +22,7 @@ public class DatabaseMapperImpl implements DatabaseMapper {
 
     @Override
     public void dropDatabase(String dbname) {
-        jdbcTemplate.update("drop database if exists" + dbname);
+        jdbcTemplate.update("drop database if exists " + dbname);
     }
 
     @Override