mysql中的mysql_real_connect连接参数设置

      CR_SOCKET_CREATE_ERROR

      Failed to create a Unix socket.
    *

      CR_UNKNOWN_HOST

      Failed to find the IP address for the hostname.
    *

      CR_VERSION_ERROR

      A protocol mismatch resulted from attempting to connect to a server with a client
library that uses a different protocol version. This can happen if you use a very old
client library to connect to a new server that wasn''t started with the --old-protocol
option.
    *

      CR_NAMEDPIPEOPEN_ERROR

      Failed to create a named pipe on Windows.
    *

      CR_NAMEDPIPEWAIT_ERROR

      Failed to wait for a named pipe on Windows.
    *

      CR_NAMEDPIPESETSTATE_ERROR

      Failed to get a pipe handler on Windows.
    *

      CR_SERVER_LOST

      If connect_timeout > 0 and it took longer than connect_timeout seconds to connect to
the server or if the server died while executing the init-command.

    因此mysql_real_connect()函数调用为：
       mysql_real_connect(mysql,"localhost","root",NULL,"test",0,NULL,0);
判断是否出错，出错调用mysql_error()函数显示出错信息，或使用mysql_errno()函数获取出错代号。
http://blog.csdn.net/newrain021011/archive/2007/03/05/1521622.aspx

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