fix TD-1115

src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBStatement.java

@@ -158,9 +158,9 @@ public class TSDBStatement implements Statement {
             throw new SQLException(TSDBConstants.FixErrMsg(TSDBConstants.JNI_CONNECTION_NULL));
         } else if (resultSetPointer == TSDBConstants.JNI_NULL_POINTER) {
             // no result set is retrieved
+			this.connecter.freeResultSet(pSql);
             res = false;
         }
-		this.connecter.freeResultSet(pSql);
 
 		return res;
 	}

src/connector/jdbc/src/test/java/TestAsyncTSDBSubscribe.java

@@ -42,12 +42,14 @@ public class TestAsyncTSDBSubscribe {
         long subscribId = 0;
         try {
             Class.forName("com.taosdata.jdbc.TSDBDriver");
+
             Properties properties = new Properties();
-        properties.setProperty(TSDBDriver.PROPERTY_KEY_HOST, host);
-        properties.setProperty(TSDBDriver.PROPERTY_KEY_TIME_ZONE, "UTC-8");
-        properties.setProperty(TSDBDriver.PROPERTY_KEY_CHARSET, "UTF-8");
-        properties.setProperty(TSDBDriver.PROPERTY_KEY_LOCALE, "en_US.UTF-8");
-        properties.setProperty(TSDBDriver.PROPERTY_KEY_TIME_ZONE, "UTC-8");
+            properties.setProperty(TSDBDriver.PROPERTY_KEY_HOST, host);
+            properties.setProperty(TSDBDriver.PROPERTY_KEY_TIME_ZONE, "UTC-8");
+            properties.setProperty(TSDBDriver.PROPERTY_KEY_CHARSET, "UTF-8");
+            properties.setProperty(TSDBDriver.PROPERTY_KEY_LOCALE, "en_US.UTF-8");
+            properties.setProperty(TSDBDriver.PROPERTY_KEY_TIME_ZONE, "UTC-8");
+
             connection = DriverManager.getConnection("jdbc:TAOS://" + host + ":0/" + dbName + "?user=root&password=taosdata", properties);
             String rawSql = "select * from " + tName + ";";
             TSDBSubscribe subscribe = ((TSDBConnection) connection).createSubscribe();