小编给大家分享一下mysql+c语言+API如何访问数据库，相信大部分人都还不怎么了解，因此分享这篇文章给大家参考一下，希望大家阅读完这篇文章后大有收获，下面让我们一起去了解一下吧！
#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
if(argc == 1)
{
if(NULL == _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“mysql+c语言+API如何访问数据库”这篇文章的所有内容，感谢各位的阅读！相信大家都有了一定的了解，希望分享的内容对大家有所帮助，如果还想学习更多知识，欢迎关注本站行业资讯频道！