MYSQL_RES *mysql_store_result(MYSQL * connection);
//成功返回结构体指针，失败返回NULL
	my_ulonglong mysql_num_row(MYSQL_RES * result);
//减速实际返回的行数
	MYSQL_ROW mysql_fetch_row(MYSQL_RES * result);
//从mysql_store_result()中得到结果的结构体，并从中检索单个行，当没有更多的数据，或者出错时，返回NULL
	void mysql_free_result(MYSQL_RES * result);
//使mySQL数据库整理分配的对象，关闭连接.

示例：

#include <iostream>
#include <fstream>
#include <cstdlib>
#include <mysql/mysql.h>
using namespace std;

void mysql_err_function(MYSQL * connection);

int main()
{
	MYSQL * connection;
	connection = mysql_init(NULL);

	if (!connection)
	{
		mysql_err_function(connection);
	}

    connection = mysql_real_connect(connection,"localhost","root","123456","test",0,NULL,0);

	if (!connection)
	{
		mysql_err_function(connection);
	}

	cout << "Connection to MySQL Server is Success..." << endl;
	string query;
	getline(cin,query);

	int res = mysql_query(connection,query.c_str());
	if (res)
	{
		mysql_err_function(connection);
	}

    MYSQL_RES * my_res = mysql_store_result(connection);

	cout << "Retrieved " << mysql_num_rows(my_res) << "rows" << endl;

	MYSQL_ROW sqlrow;
	while ((sqlrow = mysql_fetch_row(my_res)))
	{
		cout << "Fetched data..." << endl;
	}
	mysql_free_result(my_res);

	mysql_close(connection);
	cout << "Connection to MySQL Server is closed!" << endl;

	return 0;
}

void mysql_err_function(MYSQL * connection)
{
	if (mysql_errno(connection))
	{
		cout << "Error " << mysql_errno(connection) << " : "
		<< mysql_error(connection) << endl;

		exit(-1);
	}
}

2、一次提取一行数据，用于处理了大量的数据集

MYSQL_RES *mysql_use_result(MYSQL * connection);  
//成功返回结果集，失败返回NULL 

    一次取全部数据增加了网络负载，增加了时延，但是可以保证数据的完整性。

示例：

#include <iostream>
#include <cstdlib>
#include <mysql/mysql.h>
using namespace std;

void mysql_err_function(MYSQL * connection);

int main()
{
	MYSQL * connection;
	connection = mysql_init(NULL);

	if (mysql_real_connect(connection,"localhost","root","123456","test",0,NULL,0))
	{
		cout << "Connection to MySQL Server is Succeed..." << endl;
		string query;
		getline(cin,query);

		int res = mysql_query(connection,query.c_str());
		if (res)
		{
			mysql_err_function(connection);//mysql_err_function()实现代码参考上例
		}
		else
		{
			MYSQL_RES * my_res = mysql_use_result(connection);
            if (my_res)
			{
				MYSQL_ROW sqlrow;
				while ((sqlrow = mysql_fetch_row(my_res)))
				{
					cout << "Fetching the Data..." << endl;
				}

				mysql_free_result(my_res);
			}
			else
			{
				mysql_err_function(connection);
			}
		}

		mysql_close(connection);
		cout << "Connection to MySQL Server is Closed!" << endl;
	}
	else
	{
		mysql_err_function(connection);
	}
}