c调用mysql

阅读更多

root@ubuntu:/usr/local/app/taf/app_log/KMusic/MobileKMusicListServer# cat mysql_select.c 
#if defined(_WIN32) || defined(_WIN64)  //为了支持windows平台上的编译
#include 
#endif
#include 
#include 
#include "mysql.h"  //我的机器上该文件在/usr/local/include/mysql下

//定义数据库操作的宏，也可以不定义留着后面直接写进代码
#define SELECT_QUERY "select name from p_menu  where id = %d"

int main(int argc, char **argv) //char **argv 相当于 char *argv[]
{
        MYSQL mysql,*sock;    //定义数据库连接的句柄，它被用于几乎所有的MySQL函数
        MYSQL_RES *res;       //查询结果集，结构类型
        MYSQL_FIELD *fd ;     //包含字段信息的结构
        MYSQL_ROW row ;       //存放一行查询结果的字符串数组
        char  qbuf[160];      //存放查询sql语句字符串

        if (argc != 2) {  //检查输入参数
                fprintf(stderr,"usage : mysql_select \n\n");
                exit(1);
        }

        mysql_init(&mysql);
        if (!(sock = mysql_real_connect(&mysql,"localhost","root","haoning","test",0,NULL,0))) {
                fprintf(stderr,"Couldn't connect to engine!\n%s\n\n",mysql_error(&mysql));
                perror("");
                exit(1);
        }

        sprintf(qbuf,SELECT_QUERY,atoi(argv[1]));
        if(mysql_query(sock,qbuf)) {
                fprintf(stderr,"Query failed (%s)\n",mysql_error(sock));
                exit(1);
        }

        if (!(res=mysql_store_result(sock))) {
                fprintf(stderr,"Couldn't get result from %s\n", mysql_error(sock));
                exit(1);
        }

        printf("number of fields returned: %d\n",mysql_num_fields(res));

        while (row = mysql_fetch_row(res)) {
                printf("Ther userid #%d 's username is: %s\n", atoi(argv[1]),(((row[0]==NULL)&&(!strlen(row[0]))) ? "NULL" : row[0])) ; 
                puts( "query ok !\n" ) ; 
        } 

        mysql_free_result(res);
        mysql_close(sock);
        exit(0);
        return 0;   //. 为了兼容大部分的编译器加入此行
}

| p_menu | CREATE TABLE `p_menu` (
  `id` int(11) NOT NULL DEFAULT '0',
  `name` varchar(20) NOT NULL DEFAULT '',
  `url` varchar(100) DEFAULT NULL,
  `parent_id` int(11) DEFAULT '0',
  `leaf` tinyint(1) DEFAULT NULL,
  `description` text,
  `sort_id` int(11) NOT NULL DEFAULT '1',
  PRIMARY KEY (`id`)
) ENGINE=MyISAM DEFAULT CHARSET=gbk |