mysql c API访问数据库

#include <winsock2.h>

#include "CMySQL.h"
#include "stdio.h"

#define MYSQL_PORT 3306
void process_result_set(MYSQL mysql, MYSQL_RES *result);
void exit(MYSQL mydata,char *ep);

int main(int argc, char * argv[]) {

 MYSQL mydata;
 Database_Param p;
 char queryName[600];
 MYSQL_RES *result=NULL;
 int status =0;

 //初始化
 strcpy(p.host,"127.0.0.1");
 strcpy(p.user,"root");
 strcpy(p.password,"root");
 strcpy(p.db,"im");
 p.port = MYSQL_PORT;

 //初始化数据结构
 if(mysql_init(&mydata) == NULL)
 {
  printf("init mysql data stauct fail\n");
  system("pause");
  return -1;
 }
 //连接数据库
 if(argc == 1)
 {
  if(NULL == mysql_real_connect(&mydata,p.host,p.user,p.password,
   p.db,p.port,NULL,CLIENT_MULTI_STATEMENTS))
  {
   printf("connect database fail,%s\n",mysql_error(&mydata));
   system("pause");
   return -1;
  }
 }
 else
 {
  printf("run parameter error\n");
  system("pause");
  return -1;
 }

 //首先设置字符集
 strcpy(queryName,"set names gbkd");
 if(mysql_query(&mydata,"set names gbk")!=0)
 {
  exit(mydata,"set names fail");
  return -1;
 }

 //查询数据(支持单个字段和多个字段，输出排版)
 strcpy(queryName,"show databases");
 if(mysql_query(&mydata,queryName) != 0)
 {
  exit(mydata,"execute sql syntax fail");
  return -1;
 }
 //取得查询结果
 result= mysql_store_result(&mydata);
 process_result_set(mydata,result);

 //处理多条插入语句，在mysql_real_connect(......)函数里的最后一个参数更改为：CLIENT_MULTI_STATEMENTS
 strcpy(queryName,"insert into fangl.admin(username,password) values('fangl1','fangl1'),('fangl2','fangl2'),('fangl3','fangl3');\
 insert into fangl.admin(username,password) values('fl1','fl1'),('fl2','fl2'),('fl3','fl3');\
 insert into fangl.admin(username,password) values('fal1','fal1'),('fal2','fal2'),('fal3','fal3');\
 select * from fangl.admin");
 if(mysql_query(&mydata,queryName)!=0)
 {
  exit(mydata,"insert values fail");
  return -1;
 }

 do {
  /* did current statement return data? */
  result = mysql_store_result(&mydata);
  if (result)
  {
   /* yes; process rows and free the result set */
   process_result_set(mydata, result);
   mysql_free_result(result);
  }
  else          /* no result set or error */
  {
   if (mysql_field_count(&mydata) == 0)
   {
    printf("%lld rows affected\n",
     mysql_affected_rows(&mydata));
   }
   else  /* some error occurred */
   {
    printf("Could not retrieve result set\n");
    break;
   }
  }
  /* more results? -1 = no, >0 = error, 0 = yes (keep looping) */
  if ((status = mysql_next_result(&mydata)) > 0)
   printf("Could not execute statement\n");
 } while (status == 0);

 //删除表中的数据
 strcpy(queryName,"delete from fangl.admin where username='fl1'");
 if(mysql_query(&mydata,queryName) != 0)
 {
  exit(mydata,"execute sql syntax fail");
  return -1;
 }

 //查询数据(支持单个字段和多个字段，输出排版)
 strcpy(queryName,"select * from fangl.admin");
 if(mysql_query(&mydata,queryName) != 0)
 {
  return -1;
 }
 //取得查询结果
 result= mysql_store_result(&mydata);
 process_result_set(mydata,result);

 
 //释放结果
 if(result != NULL)
 {
  mysql_free_result(result);
 }

 mysql_close(&mydata);
 system("pause");
 return 1;
}

void process_result_set(MYSQL mydata, MYSQL_RES *result)
{
 int rowcount = mysql_num_rows(result);       //查询结果有多少行

 //取得各字段名
 MYSQL_FIELD *fields = NULL;

 for(int i=0;fields=mysql_fetch_field(result);i++)
 {
  printf("%s ",fields->name);
 }
 printf("\n");

 //依次读取各条记录
 MYSQL_ROW currow = NULL;
 while((currow = mysql_fetch_row(result)) != NULL)
 {
  for(int i = 0; i < mysql_num_fields(result); ++i)
  {
   printf("%s ",currow[i]?currow[i]:"NULL");
  }
  printf("\n");
 }
}

void exit(MYSQL mydata,char *ep)
{
 mysql_close(&mydata);
 printf("%s,%s\n",ep,mysql_error(&mydata));
 system("pause");
}

以上是在vs 2008下编译并验证无误的，若有问题大家一起讨论，哈