MySQL connection port or IP connection timeout errors solution

　　Call in Visual Studio mysql_real_connect () function to connect MySQL process, when only the IP connection error, there is a connection timeout about 20 seconds, the last connection failure; when there is a connection port wrong, there will be about 60 seconds connection timeout, Finally, the connection fails.

 

　　By mysql_real_connect () before configuring the following functions:

　　mysql_options(handle, MYSQL_OPT_CONNECT_TIMEOUT, timeOut)

　　But it does not succeed after a timeout, the end of the connection request.

 

　　There is provided a process solution as follows:

 1 struct MySqlConnOpts_t
 2 {
 3     MYSQL* pConnHandle;
 4     std::string strIp;
 5     std::string strUserName;
 6     std::string strPassWord;
 7     int nPort;
 8     int nErrNum;
 9 
10     MySqlConnOpts_t()
11     {
12         pConnHandle = NULL;
13         strIp = "";
14         strUserName = "";
15         strPassWord = "";
16         nPort = -1;
17         nErrNum = -1;
18     }
19 };
20 
21 MySqlConnOpts_t* pConnectOptions = new MySqlConnOpts_t;
22 // pConnectOptions 中 pConnHandle、strIp、strUserName、strPassWord、nPort 的初始化；
23 
24 DWORD WINAPI mysqlConnect(LPVOID lpParam)
25 {
26     DWORD ret = 0;
27     MySqlConnOpts_t* pConnOpts = static_cast<MySqlConnOpts_t*>(lpParam);
28 
29     IF (== NULL mysql_real_connect (pConnOpts-> pConnHandle, pConnOpts-> strIp, pConnOpts-> strUserName, pConnOpts-> strPassword, pConnOpts-> nPort, NULL, CLIENT_MULTI_STATEMENTS))
 30      {
 31 is            RET = - . 1 ;
 32      }
 33 is  
34 is      pConnOpts -> = nErrNum RET;
 35  
36      return RET;
 37 [  }
 38 is  
39  const  int nTimeOut = 1000 ;   // timeout setting unit MS; 
40 HANDLE = hThread the CreateThread (NULL, 0 , mysqlconnect, pConnectOptions, 0, NULL);
 41 is DWORD = dwRet the WaitForSingleObject (hThread, nTimeOut);
 42 is  the CloseHandle (hThread);
 43 is  
44 is  IF ( 0 ! = DwRet)
 45  {
 46 is      // process timeout logic; 
47  }
 48  
49  IF ( 0 ! = PConnectOptions- > nErrNum)
 50  {
 51 is      // processing error connection logic 
52  }
 53 is  
54 is  // process pConnectOptions pointer;

 　　Connection timeout problem can be solved.