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 to 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 to 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{
    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))) {
      rows++;
      taos_print_row(temp, row, fields, num_fields);
      printf("%s\n", temp);
      lua_pushnumber(L,rows);
      lua_pushstring(L,temp);
      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;
}