Merge pull request #3923 from taosdata/xiaoping/add_test_case2

[TD-1743]<test> add test case for remove db and STable

tests/pytest/query/removeDBAndSTable.py

+###################################################################
+#           Copyright (c) 2016 by TAOS Technologies, Inc.
+#                     All rights reserved.
+#
+#  This file is proprietary and confidential to TAOS Technologies.
+#  No part of this file may be reproduced, stored, transmitted,
+#  disclosed or used in any form or by any means other than as
+#  expressly provided by the written permission from Jianhui Tao
+#
+###################################################################
+
+# -*- coding: utf-8 -*-
+
+import sys
+import taos
+from util.log import tdLog
+from util.cases import tdCases
+from util.sql import tdSql
+from util.dnodes import tdDnodes
+
+
+class TDTestCase:
+    def init(self, conn, logSql):
+        tdLog.debug("start to execute %s" % __file__)
+        tdSql.init(conn.cursor(), logSql)
+
+    def run(self):
+        tdSql.prepare()
+
+        print("==============step1")
+        tdSql.execute("create database db_vplu");
+        tdSql.execute("use db_vplu")
+        tdSql.execute("CREATE table if not exists st (ts timestamp, speed int) tags(id int)")
+        tdSql.execute("CREATE table if not exists st_vplu (ts timestamp, speed int) tags(id int)")
+
+        print("==============step2")
+
+        tdSql.execute("drop table st")
+
+        tdSql.query("show stables")
+        tdSql.checkRows(1)
+        tdSql.checkData(0, 0, "st_vplu")
+
+        tdDnodes.stopAll()
+        tdDnodes.start(1)
+        
+        tdSql.execute("use db_vplu")
+        tdSql.query("show stables")
+        tdSql.checkRows(1)
+        tdSql.checkData(0, 0, "st_vplu")
+
+        tdSql.execute("drop database db")
+        tdSql.query("show databases")
+        tdSql.checkRows(1)
+        tdSql.checkData(0, 0, "db_vplu")
+
+        tdDnodes.stopAll()
+        tdDnodes.start(1)
+
+        tdSql.query("show databases")
+        tdSql.checkRows(1)
+        tdSql.checkData(0, 0, "db_vplu")
+
+    def stop(self):
+        tdSql.close()
+        tdLog.success("%s successfully executed" % __file__)
+
+
+tdCases.addWindows(__file__, TDTestCase())
+tdCases.addLinux(__file__, TDTestCase())