Merge pull request #324 from robotspace/master

Return records with seperated fields in Lua connector.

tests/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 needs install Lua5.3 .
+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 .
 
 ## Dependencies
 - Lua: 

tests/examples/lua/lua_connector.c

@@ -22,7 +22,7 @@ static int l_connect(lua_State *L)
 
   taos = taos_connect(host, user,password,database, port);
   if (taos == NULL) {
-    printf("failed to connect to server, reason:%s\n", taos_errstr(taos));
+    printf("failed to connect server, reason:%s\n", taos_errstr(taos));
     
     lua_pushnumber(L, -1);
     lua_setfield(L, table_index, "code");
@@ -30,7 +30,7 @@ static int l_connect(lua_State *L)
     lua_setfield(L, table_index, "error");    
     lua_pushlightuserdata(L,NULL);
   }else{
-    printf("success to connect to server\n");
+    printf("success to connect server\n");
     lua_pushnumber(L, 0);
     lua_setfield(L, table_index, "code");
     lua_pushstring(L, taos_errstr(taos));
@@ -60,6 +60,7 @@ static int l_query(lua_State *L){
     return 1;
     
   }else{
+    //printf("success to query.\n");
     result = taos_use_result(taos);
 
     if (result == NULL) {
@@ -82,14 +83,58 @@ static int l_query(lua_State *L){
     lua_newtable(L);
     
     while ((row = taos_fetch_row(result))) {
+      //printf("row index:%d\n",rows);
       rows++;
-      taos_print_row(temp, row, fields, num_fields);
-      printf("%s\n", temp);
+
       lua_pushnumber(L,rows);
-      lua_pushstring(L,temp);
+      lua_newtable(L);
+
+      for (int i = 0; i < num_fields; ++i) {
+	if (row[i] == NULL) {
+	  continue;
+	}
+
+	lua_pushstring(L,fields[i].name);
+	//printf("field name:%s,type:%d\n",fields[i].name,fields[i].type);
+	switch (fields[i].type) {
+	case TSDB_DATA_TYPE_TINYINT:
+	  lua_pushinteger(L,*((char *)row[i]));
+	  break;
+	case TSDB_DATA_TYPE_SMALLINT:
+	  lua_pushinteger(L,*((short *)row[i]));
+	  break;
+	case TSDB_DATA_TYPE_INT:
+	  lua_pushinteger(L,*((int *)row[i]));
+	  break;
+	case TSDB_DATA_TYPE_BIGINT:
+	  lua_pushinteger(L,*((int64_t *)row[i]));
+	  break;
+	case TSDB_DATA_TYPE_FLOAT:
+	  lua_pushnumber(L,*((float *)row[i]));
+	  break;
+	case TSDB_DATA_TYPE_DOUBLE:
+	  lua_pushnumber(L,*((double *)row[i]));
+	  break;
+	case TSDB_DATA_TYPE_BINARY:
+	case TSDB_DATA_TYPE_NCHAR:
+	  lua_pushstring(L,(char *)row[i]);
+	  break;
+	case TSDB_DATA_TYPE_TIMESTAMP:
+	  lua_pushinteger(L,*((int64_t *)row[i]));
+	  break;
+	case TSDB_DATA_TYPE_BOOL:
+	  lua_pushinteger(L,*((char *)row[i]));
+	  break;
+	default:
+	  lua_pushnil(L);
+	  break;
+	}
+
 	lua_settable(L,-3);
       }
 
+      lua_settable(L,-3);
+    }
     taos_free_result(result);    
   }
 

tests/examples/lua/test.lua

-local mylib = require "luaconnector"
+local driver = require "luaconnector"
 
 local host="127.0.0.1"
 local user="root"
@@ -7,7 +7,7 @@ local db =nil
 local port=6030
 local conn
 
-local res = mylib.connect(host,user,password,db,port)
+local res = driver.connect(host,user,password,db,port)
 if res.code ~=0 then
    print(res.error)
    return
@@ -15,33 +15,44 @@ else
    conn = res.conn
 end
 
-local res = mylib.query(conn,"drop database demo")
+local res = driver.query(conn,"drop database demo")
 
-res = mylib.query(conn,"create database demo")
+res = driver.query(conn,"create database demo")
 if res.code ~=0 then
    print(res.error)
    return
 end
 
-res = mylib.query(conn,"use demo")
+res = driver.query(conn,"use demo")
 if res.code ~=0 then
    print(res.error)
    return
 end
 
-res = mylib.query(conn,"create table m1 (ts timestamp, speed int)")
+res = driver.query(conn,"create table m1 (ts timestamp, speed int,owner binary(20))")
 if res.code ~=0 then
    print(res.error)
    return
 end
 
-res = mylib.query(conn,"insert into m1 values (1592222222223,3)")
+res = driver.query(conn,"insert into m1 values (1592222222222,0,'robotspace'), (1592222222223,1,'Hilink'),(1592222222224,2,'Harmony')")
+if res.code ~=0 then
+   print(res.error)
+   return
+end
 
-res = mylib.query(conn,"select * from m1")
+res = driver.query(conn,"select * from m1")
 
-if res.code ==0 then
+if res.code ~=0 then
+   print("select error:"..res.error)
+   return
+else
    print("in lua, result:")
-   for i=1,#(res.item) do
-      print(res.item[i])
+   for i = 1, #(res.item) do
+      print("timestamp:"..res.item[i].ts)
+      print("speed:"..res.item[i].speed)
+      print("owner:"..res.item[i].owner)
    end
 end
+
+driver.close(conn)