lua_connector.c

#include <stdio.h>
#include <math.h>
#include <stdarg.h>
#include <stdlib.h>
#include <lua.h>
#include <lauxlib.h>
#include <lualib.h>
#include <taos.h>

static int l_connect(lua_State *L)
{
  TAOS *    taos;
  char *host = lua_tostring(L, 1);
  char *user = lua_tostring(L, 2);
  char *password = lua_tostring(L, 3);
  char *database = lua_tostring(L, 4);
  int port =luaL_checknumber(L, 5);
  taos_init();
  
  lua_newtable(L);
  int table_index = lua_gettop(L);

  taos = taos_connect(host, user,password,database, port);
  if (taos == NULL) {
    printf("failed to connect server, reason:%s\n", taos_errstr(taos));
    
    lua_pushnumber(L, -1);
    lua_setfield(L, table_index, "code");
    lua_pushstring(L, taos_errstr(taos));
    lua_setfield(L, table_index, "error");    
    lua_pushlightuserdata(L,NULL);
  }else{
    printf("success to connect server\n");
    lua_pushnumber(L, 0);
    lua_setfield(L, table_index, "code");
    lua_pushstring(L, taos_errstr(taos));
    lua_setfield(L, table_index, "error");    
    lua_pushlightuserdata(L,taos);
    lua_setfield(L, table_index, "conn");
  }

  return 1;
}

static int l_query(lua_State *L){
  TAOS *    taos= lua_topointer(L,1);
  char *s = lua_tostring(L, 2);
  TAOS_RES *result;
  lua_newtable(L);
  int table_index = lua_gettop(L);

  printf("receive command:%s\r\n",s);
  if(taos_query(taos, s)!=0){
    printf("failed, reason:%s\n", taos_errstr(taos));
    lua_pushnumber(L, -1);
    lua_setfield(L, table_index, "code");    
    lua_pushstring(L, taos_errstr(taos));
    lua_setfield(L, table_index, "error");    
   
    return 1;
    
  }else{
    //printf("success to query.\n");
    result = taos_use_result(taos);

    if (result == NULL) {
      printf("failed to get result, reason:%s\n", taos_errstr(taos));
      lua_pushnumber(L, -2);
      lua_setfield(L, table_index, "code");    
      lua_pushstring(L, taos_errstr(taos));
      lua_setfield(L, table_index, "error");    
      return 1;
    }

    TAOS_ROW    row;
    int         rows = 0;
    int         num_fields = taos_field_count(taos);
    TAOS_FIELD *fields = taos_fetch_fields(result);
    char        temp[256];

    lua_pushnumber(L, 0);
    lua_setfield(L, table_index, "code");
    lua_newtable(L);
    
    while ((row = taos_fetch_row(result))) {
      //printf("row index:%d\n",rows);
      rows++;

      lua_pushnumber(L,rows);
      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);    
  }

  lua_setfield(L, table_index, "item");
  return 1;
}

static int l_close(lua_State *L){
  TAOS *    taos= lua_topointer(L,1);
  lua_newtable(L);
  int table_index = lua_gettop(L);
  
  if(taos == NULL){
    lua_pushnumber(L, -1);
    lua_setfield(L, table_index, "code");    
    lua_pushstring(L, "null pointer.");
    lua_setfield(L, table_index, "error"); 
  }else{
    taos_close(taos);   
    lua_pushnumber(L, 0);
    lua_setfield(L, table_index, "code");    
    lua_pushstring(L, "done.");
    lua_setfield(L, table_index, "error");    
  }
  return 1;
}

static const struct luaL_Reg lib[] = {
    {"connect", l_connect},
    {"query", l_query},
    {"close", l_close},
    {NULL, NULL}
};

extern int luaopen_luaconnector(lua_State* L)
{
    luaL_newlib(L, lib);

    return 1;
}