#include <stdio.h> #include <stdlib.h> #include <string.h> #include <sqltypes.h>#include <sql.h>#include <sqlext.h>extern HENV                    Environment; extern HDBC                    Connection; extern HSTMT                   Statement; extern char USER[512];extern char SERVER[512];extern char PASSWORD[512];extern char DATABASE[512];int read_login_info();void CheckReturn(); int Connect(); int Disconnect();