How can I connect MySQL with using socket programming in C++ - c++

Question

I am newbie in programming world. I am trying to make Login system with C++ so I try to connect MySQL database with my server program. without using socket I can connect with database well. But my Final Goal is to success login to my local server and add information to my DB.
I found that if I add "driver.h" from MySQL Connector 8.0, It said the connection is gone. actually it cant connect to socket. but when I comment out the "driver.h" hearder, It connect to socket well. but without "driver.h", I cant connect to my DB.
What is the problem and How can I solve it? the version of VS is 2022, and MySQL version is 8.0.30. Below is my full Code of Client and Server.
And sorry I cant emebed image still I am newbie here
[So I post in Notion][1]:https://sunny-green-970.notion.site/Error-ea96fbef0ea64e1bb1fd966699657547
Client
#define _CRT_SECURE_NO_WARNINGS
#define _WINSOCK_DEPRECATED_NO_WARNINGS
#include <stdio.h>
#include <WinSock2.h>
#include <iostream>
#pragma comment(lib, "ws2_32.lib")
int main()
{
WSAData wsaData;
WSAStartup(MAKEWORD(2, 2), &wsaData);
SOCKET ServerSocket = socket(AF_INET, SOCK_STREAM, 0);
SOCKADDR_IN ServerAddrIn;
memset(&ServerAddrIn, 0, sizeof(SOCKADDR_IN));
ServerAddrIn.sin_family = PF_INET;
ServerAddrIn.sin_addr.s_addr = inet_addr("127.0.0.1");
ServerAddrIn.sin_port = htons(1234);
printf("client\n");
if (connect(ServerSocket, (SOCKADDR*)&ServerAddrIn, sizeof(SOCKADDR_IN)) == SOCKET_ERROR) // 자기 ip와 port 필요없다. 서버에 접속하면 된다.
{
std::cout << "Connect Failed." << std::endl;
exit(-1);
}
int Numnber = 0;
int WinCount = 0;
int TotalGamePlay = 0;
//connect(ServerSocket, (SOCKADDR*)&ServerAddrIn, sizeof(SOCKADDR_IN));
printf("Please Type Number: ");
scanf("%d", &Numnber);
printf("Please Type WinCount: ");
scanf("%d", &WinCount);
printf("Please Type TotalGamePlay: ");
scanf("%d", &TotalGamePlay);
char Buffer[1024] = { 0, };
memcpy(Buffer, &Numnber, 4);
memcpy(&Buffer[4], &WinCount, 4);
memcpy(&Buffer[8], &TotalGamePlay, 4);
int SentLength = send(ServerSocket, Buffer, 12, 0);
printf("Sent Length : %d\n", SentLength);
if (SentLength == 0)
{
//연결 종료s
std::cout << "Disconnected Client." << std::endl;
}
else if (SentLength < 0)
{
//Error
std::cout << "Disconnected Client By Error : " << GetLastError() << std::endl;
}
WSACleanup();
return 0;
}
Server
#define _WINSOCK_DEPRECATED_NO_WARNINGS
#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <iostream>
#include <WinSock2.h>
#include <Windows.h>
#include "jdbc/mysql_connection.h"
#include "jdbc/cppconn/exception.h"
#include "jdbc/cppconn/resultset.h"
#include "jdbc/cppconn/statement.h"
#include "jdbc/cppconn/prepared_statement.h"
#include "jdbc/cppconn/driver.h"
#pragma comment(lib, "ws2_32.lib")
#ifdef _DEBUG
#pragma comment(lib, "debug/mysqlcppconn.lib")
#else
#pragma comment(lib, "mysqlcppconn.lib")
#endif
using namespace std;
std::string Utf8ToMultiByte(std::string utf8_str);
int main()
{
bool bRunning = true;
WSAData wsaData;
WSAStartup(MAKEWORD(2, 2), &wsaData);
SOCKET ServerSocket = socket(AF_INET, SOCK_STREAM, 0);
SOCKADDR_IN ServerAddrIn;
memset(&ServerAddrIn, 0, sizeof(SOCKADDR_IN));
ServerAddrIn.sin_family = AF_INET;
ServerAddrIn.sin_port = htons(1234);
ServerAddrIn.sin_addr.s_addr = htonl(INADDR_ANY);
fd_set Original;
fd_set CopyReads;
timeval Timeout;
Timeout.tv_sec = 0;
Timeout.tv_usec = 10;
FD_ZERO(&Original);
FD_SET(ServerSocket, &Original);
bind(ServerSocket, (SOCKADDR*)&ServerAddrIn, sizeof(SOCKADDR_IN));
listen(ServerSocket, 0);
printf("Server\n");
while (bRunning)
{
CopyReads = Original;
//polling
int fd_num = select(0, &CopyReads, 0, 0, &Timeout);
if (fd_num == 0)
{
continue;
}
if (fd_num == SOCKET_ERROR)
{
bRunning = false;
break;
}
for (size_t i = 0; i < Original.fd_count; ++i)
{
//등록한 소켓 리스트 중에 이벤트 발생 했음
if (FD_ISSET(Original.fd_array[i], &CopyReads))
{
if (Original.fd_array[i] == ServerSocket)
{
//서버 소켓에 이벤트가 발생함, 연결 요청
SOCKADDR_IN ClientSockAddrIn;
memset((char*)&ClientSockAddrIn, 0, sizeof(SOCKADDR_IN));
int ClientSockAddrInSize = sizeof(SOCKADDR_IN);
SOCKET ClientSocket = accept(ServerSocket, (SOCKADDR*)&ClientSockAddrIn, &ClientSockAddrInSize);
FD_SET(ClientSocket, &Original);
std::cout << "Connected client : " << ClientSocket << std::endl;
}
else
{
SOCKET ClientSocket = Original.fd_array[i];
//Client 소켓, Recv, Send
char Buffer[1024] = { 0, };
//blocking, non blocking
//packet 설계, protocol
int RecvLength = recv(ClientSocket, Buffer, sizeof(Buffer), 0);
if (RecvLength == 0)
{
//연결 종료
std::cout << "Disconnected Client." << std::endl;
FD_CLR(ClientSocket, &Original);
closesocket(ClientSocket);
}
else if (RecvLength < 0)
{
//Error
std::cout << "Disconnected Client By Error : " << GetLastError() << std::endl;
FD_CLR(ClientSocket, &Original);
closesocket(ClientSocket);
}
else
{
//자료가 있으면 처리
//packet parse
int number = 0;
int wincount = 0;
int totalgameplay = 0;
memcpy(&number, &buffer[0], 4);
memcpy(&wincount, &buffer[4], 4);
memcpy(&totalgameplay, &buffer[8], 4);
try
{
sql::driver* driver; //workbench
sql::connection* connection; //접속
sql::statement* statement; //query
sql::resultset* resultset; //결과화면
sql::preparedstatement* preparedstatement;
//work벤치 켜기
driver = get_driver_instance();
//연결 버튼 누르기
connection = driver->connect("tcp://127.0.0.1:3306", "root", "secret");
if (connection == nullptr)
{
cout << "connect failed" << endl;
exit(-1);
}
사용 데이터베이스 선정(use)
connection->setschema("logindata");
preparedstatement = connection->preparestatement("insert into new_table(number, wincount, totalgameplay) values( ?, ? ,?)");
preparedstatement->setint(1, number);
preparedstatement->setint(2, wincount);
preparedstatement->setint(3, totalgameplay);
preparedstatement->executeupdate();
statement = connection->createstatement();
resultset = statement->executequery("select * from new_table ");
for (;resultset->next();)
{
cout << resultset->getint("number") << " : " <<
utf8tomultibyte(resultset->getstring("wincount")) << " : " <<
utf8tomultibyte(resultset->getstring("totalgameplay")) << endl;
}
delete resultset;
delete preparedstatement;
delete connection;
}
catch (sql::sqlexception e)
{
cout << "# err: sqlexception in " << __file__;
cout << "(" << __function__ << ") on line " << __line__ << endl;
cout << "# err: " << e.what();
cout << " (mysql error code: " << e.geterrorcode();
cout << ", sqlstate: " << e.getsqlstate() << " )" << endl;
}
/*for (size_t i = 0; i < original.fd_count; ++i)
{
if (original.fd_array[i] != serversocket)
{
std::cout << original.fd_array[i] << std::endl;
int sentlength = send(original.fd_array[i], buffer, 8, 0);
}
}*/
}
}
}
}
}
closesocket(ServerSocket);
WSACleanup();
return 0;
}
std::string Utf8ToMultiByte(std::string utf8_str)
{
std::string resultString; char* pszIn = new char[utf8_str.length() + 1];
strncpy_s(pszIn, utf8_str.length() + 1, utf8_str.c_str(), utf8_str.length());
int nLenOfUni = 0, nLenOfANSI = 0; wchar_t* uni_wchar = NULL;
char* pszOut = NULL;
// 1. utf8 Length
if ((nLenOfUni = MultiByteToWideChar(CP_UTF8, 0, pszIn, (int)strlen(pszIn), NULL, 0)) <= 0)
return nullptr;
uni_wchar = new wchar_t[nLenOfUni + 1];
memset(uni_wchar, 0x00, sizeof(wchar_t) * (nLenOfUni + 1));
// 2. utf8 --> unicode
nLenOfUni = MultiByteToWideChar(CP_UTF8, 0, pszIn, (int)strlen(pszIn), uni_wchar, nLenOfUni);
// 3. ANSI(multibyte) Length
if ((nLenOfANSI = WideCharToMultiByte(CP_ACP, 0, uni_wchar, nLenOfUni, NULL, 0, NULL, NULL)) <= 0)
{
delete[] uni_wchar; return 0;
}
pszOut = new char[nLenOfANSI + 1];
memset(pszOut, 0x00, sizeof(char) * (nLenOfANSI + 1));
// 4. unicode --> ANSI(multibyte)
nLenOfANSI = WideCharToMultiByte(CP_ACP, 0, uni_wchar, nLenOfUni, pszOut, nLenOfANSI, NULL, NULL);
pszOut[nLenOfANSI] = 0;
resultString = pszOut;
delete[] uni_wchar;
delete[] pszOut;
return resultString;
}
[1]: https://sunny-green-970.notion.site/Error-ea96fbef0ea64e1bb1fd966699657547
[2]: https://i.stack.imgur.com/VK8m0.png