Drop stream when test case is over. Add commands to disable built-in lualib. (#17134)

examples/lua/README.md

 # TDengine driver connector for Lua
 
 It's a Lua implementation for [TDengine](https://github.com/taosdata/TDengine), an open-sourced big data platform designed and optimized for the Internet of Things (IoT), Connected Cars, Industrial IoT, and IT Infrastructure and Application Monitoring. You may need to install Lua5.3 .
+As TDengine is built with lua-enable with default configure, the built-in lua lib conflicts with external lua lib. The following commands require TDengine built with lua-disable.
+To disable built-in lua:
+```
+mkdir debug && cd debug
+cmake .. -DBUILD_LUA=false && cmake --build .
+```
 
 ## Lua Dependencies
 - Lua: 

examples/lua/lua51/lua_connector51.c

@@ -29,7 +29,7 @@ static int l_connect(lua_State *L){
   luaL_checktype(L, 1, LUA_TTABLE);
 
   lua_getfield(L, 1,"host");
-  if (lua_isstring(L,-1)){
+  if (lua_isstring(L, -1)){
     host = lua_tostring(L, -1);
     // printf("host = %s\n", host);
   }
@@ -58,8 +58,9 @@ static int l_connect(lua_State *L){
     //printf("password = %s\n", password);
   }
 
-  lua_settop(L,0);
+  lua_settop(L, 0);
 
+  taos_init();
   
   lua_newtable(L);
   int table_index = lua_gettop(L);
@@ -125,7 +126,7 @@ static int l_query(lua_State *L){
       //printf("row index:%d\n",rows);
       rows++;
 
-      lua_pushnumber(L,rows);
+      lua_pushnumber(L, rows);
       lua_newtable(L);
 
       for (int i = 0; i < num_fields; ++i) {
@@ -136,15 +137,19 @@ static int l_query(lua_State *L){
 	lua_pushstring(L,fields[i].name);
 	int32_t* length = taos_fetch_lengths(result);
 	switch (fields[i].type) {
+	case TSDB_DATA_TYPE_UTINYINT:
 	case TSDB_DATA_TYPE_TINYINT:
 	  lua_pushinteger(L,*((char *)row[i]));
 	  break;
+	case TSDB_DATA_TYPE_USMALLINT:
 	case TSDB_DATA_TYPE_SMALLINT:
 	  lua_pushinteger(L,*((short *)row[i]));
 	  break;
+	case TSDB_DATA_TYPE_UINT:
 	case TSDB_DATA_TYPE_INT:
 	  lua_pushinteger(L,*((int *)row[i]));
 	  break;
+	case TSDB_DATA_TYPE_UBIGINT:
 	case TSDB_DATA_TYPE_BIGINT:
 	  lua_pushinteger(L,*((int64_t *)row[i]));
 	  break;
@@ -154,6 +159,7 @@ static int l_query(lua_State *L){
 	case TSDB_DATA_TYPE_DOUBLE:
 	  lua_pushnumber(L,*((double *)row[i]));
 	  break;
+	case TSDB_DATA_TYPE_JSON:
 	case TSDB_DATA_TYPE_BINARY:
 	case TSDB_DATA_TYPE_NCHAR:
 	  //printf("type:%d, max len:%d, current len:%d\n",fields[i].type, fields[i].bytes, length[i]);
@@ -197,7 +203,7 @@ void async_query_callback(void *param, TAOS_RES *result, int code){
     printf("failed, reason:%s\n", taos_errstr(result));
     lua_pushinteger(L, -1);
     lua_setfield(L, table_index, "code");    
-    lua_pushstring(L,"something is wrong");// taos_errstr(taos));
+    lua_pushstring(L, taos_errstr(result));
     lua_setfield(L, table_index, "error");    
   }else{
     //printf("success to async query.\n");
@@ -214,9 +220,9 @@ void async_query_callback(void *param, TAOS_RES *result, int code){
 
 static int l_async_query(lua_State *L){
   int r = luaL_ref(L, LUA_REGISTRYINDEX);
-  TAOS *    taos = (TAOS*)lua_topointer(L,1);
-  const char * sqlstr = lua_tostring(L,2);
-  // int stime = luaL_checknumber(L,3);
+  TAOS *    taos = (TAOS*)lua_topointer(L, 1);
+  const char * sqlstr = lua_tostring(L, 2);
+  // int stime = luaL_checknumber(L, 3);
 
   lua_newtable(L);
   int table_index = lua_gettop(L);
@@ -224,7 +230,7 @@ static int l_async_query(lua_State *L){
   struct async_query_callback_param *p = malloc(sizeof(struct async_query_callback_param));
   p->state = L;
   p->callback=r;
-  // printf("r:%d, L:%d\n",r,L);
+  // printf("r:%d, L:%d\n", r, L);
   taos_query_a(taos,sqlstr,async_query_callback,p);
 
   lua_pushnumber(L, 0);
@@ -267,7 +273,7 @@ static const struct luaL_Reg lib[] = {
 extern int luaopen_luaconnector51(lua_State* L)
 {
   //  luaL_register(L, "luaconnector51", lib);
-  lua_newtable (L);
+  lua_newtable(L);
   luaL_setfuncs(L,lib,0);
   return 1;
 }

examples/lua/lua_connector.c

@@ -29,7 +29,7 @@ static int l_connect(lua_State *L){
   luaL_checktype(L, 1, LUA_TTABLE);
 
   lua_getfield(L, 1,"host");
-  if (lua_isstring(L,-1)){
+  if (lua_isstring(L, -1)){
     host = lua_tostring(L, -1);
     // printf("host = %s\n", host);
   }
@@ -58,7 +58,7 @@ static int l_connect(lua_State *L){
     //printf("password = %s\n", password);
   }
 
-  lua_settop(L,0);
+  lua_settop(L, 0);
 
   taos_init();
   
@@ -126,7 +126,7 @@ static int l_query(lua_State *L){
       //printf("row index:%d\n",rows);
       rows++;
 
-      lua_pushnumber(L,rows);
+      lua_pushnumber(L, rows);
       lua_newtable(L);
 
       for (int i = 0; i < num_fields; ++i) {
@@ -203,7 +203,7 @@ void async_query_callback(void *param, TAOS_RES *result, int code){
     printf("failed, reason:%s\n", taos_errstr(result));
     lua_pushinteger(L, -1);
     lua_setfield(L, table_index, "code");    
-    lua_pushstring(L,"something is wrong");// taos_errstr(taos));
+    lua_pushstring(L, taos_errstr(result));
     lua_setfield(L, table_index, "error");    
   }else{
     //printf("success to async query.\n");
@@ -220,9 +220,9 @@ void async_query_callback(void *param, TAOS_RES *result, int code){
 
 static int l_async_query(lua_State *L){
   int r = luaL_ref(L, LUA_REGISTRYINDEX);
-  TAOS *    taos = (TAOS*)lua_topointer(L,1);
-  const char * sqlstr = lua_tostring(L,2);
-  // int stime = luaL_checknumber(L,3);
+  TAOS *    taos = (TAOS*)lua_topointer(L, 1);
+  const char * sqlstr = lua_tostring(L, 2);
+  // int stime = luaL_checknumber(L, 3);
 
   lua_newtable(L);
   int table_index = lua_gettop(L);
@@ -230,7 +230,7 @@ static int l_async_query(lua_State *L){
   struct async_query_callback_param *p = malloc(sizeof(struct async_query_callback_param));
   p->state = L;
   p->callback=r;
-  // printf("r:%d, L:%d\n",r,L);
+  // printf("r:%d, L:%d\n", r, L);
   taos_query_a(taos,sqlstr,async_query_callback,p);
 
   lua_pushnumber(L, 0);

examples/lua/test.lua

@@ -176,8 +176,14 @@ end
 driver.query_a(conn,"INSERT INTO therm1 VALUES ('2019-09-01 00:00:00.005', 100),('2019-09-01 00:00:00.006', 101),('2019-09-01 00:00:00.007', 102)", async_query_callback)
 
 res = driver.query(conn, "create stream stream_avg_degree into avg_degree as select avg(degree) from thermometer interval(5s) sliding(1s)")
+if res.code ~=0 then
+   print("create stream--- failed:"..res.error)
+   return
+else
+   print("create stream--- pass")
+end
 
-print("From now on we start continous insert in an definite loop, pls wait for about 10 seconds and check stream table for result.")
+print("From now on we start continous insertion in an definite loop, please wait for about 10 seconds and check stream table avg_degree for result.")
 local loop_index = 0
 while loop_index < 10 do
    local t = os.time()*1000
@@ -193,5 +199,5 @@ while loop_index < 10 do
    os.execute("sleep " .. 1)
    loop_index = loop_index + 1
 end
-driver.query(conn,"DROP STREAM IF EXISTS avg_therm_s")
+driver.query(conn,"DROP STREAM IF EXISTS stream_avg_degree")
 driver.close(conn)