c++连接mysql时，比如查询语句中含有中文，或者得到结果中含有中文，经常出现编译出错或乱码问题。
VS编译器默认使用gbk编码。
如果将mysql设置为utf-8编码，则需要先将c++中的各种中文字符串转为utf-8编码输入mysql，得到的结果为utf-8编码，需要转为gbk才能正常显示。转来转去很麻烦。
换个角度，将mysql设置为gbk编码，这不就大功告成了吗?附代码如下：

#include <iostream>
#include <winsock2.h>
#include "mysql.h"

using namespace std;
int main(int argc, char* argv[])
{
    mysql_library_init(NULL, 0, 0);
    MYSQL mysql;
    mysql_init(&mysql);

    if (0 == mysql_options(&mysql, MYSQL_SET_CHARSET_NAME, "gbk"))//设置字符集
    {
        cout << "设置字符集成功\n\n" << endl;
    }

    if (!mysql_real_connect(&mysql, "localhost", "root", "123456", "测试", 3306, NULL, CLIENT_MULTI_STATEMENTS))//连接数据库
    {
        cout << "not connect mysql" << endl;
    }
    else
    {
        cout << "welcome to mysql\n\n\n";
    }

    mysql_query(&mysql, "select * from 学生信息");          //执行SQL语句
    MYSQL_RES *result = mysql_use_result(&mysql);       //获取资源
    int rowcount = mysql_num_rows(result);                //获取记录数
    unsigned int fieldcount = mysql_num_fields(result);   //获取字段数

    MYSQL_FIELD *field = NULL;                            //字段
    MYSQL_ROW row = NULL;                         //记录
    while (row = mysql_fetch_row(result))
    {
        for (unsigned int i = 0; i<fieldcount; i++)
        {
            field = mysql_fetch_field_direct(result, i);
            cout << field->name << ":" << row[i] << "\n";
        }
    }

    mysql_free_result(result);
    mysql_close(&mysql);
    mysql_server_end();
    mysql_library_end();

    return 0;
}