showdb_test.c

来自「几个嵌入式MYSQL编程示例」· C语言 代码 · 共 68 行

/* Copyright (C) 2000 MySQL AB

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */


#ifdef __WIN__
#include <windows.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include "mysql.h"

#define SELECT_QUERY "select name from test where num = %d"


int main(int argc, char **argv)
{
  int	count, num;
  MYSQL mysql,*sock;
  MYSQL_RES *res;
  char	qbuf[160];

  if (argc != 3)
  {
    fprintf(stderr,"usage : select_test <dbname> <num>\n\n");
    exit(1);
  }

  mysql_init(&mysql);
  if (!(sock = mysql_real_connect(&mysql,NULL,0,0,argv[1],0,NULL,0)))
  {
    fprintf(stderr,"Couldn't connect to engine!\n%s\n\n",mysql_error(&mysql));
    perror("");
    exit(1);
  }
  mysql.reconnect= 1;

  count = 0;
  num = atoi(argv[2]);
  while (count < num)
  {
    sprintf(qbuf,SELECT_QUERY,count);
    if(!(res=mysql_list_dbs(sock,NULL)))
    {
      fprintf(stderr,"Query failed (%s)\n",mysql_error(sock));
      exit(1);
    }
    printf("number of fields: %d\n",mysql_num_rows(res));
    mysql_free_result(res);
    count++;
  }
  mysql_close(sock);
  exit(0);
  return 0;					/* Keep some compilers happy */
}