Linker error when compiling

Linking...
msvcprt.lib(MSVCP60.dll) : error LNK2005: "public: __thiscall std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >::~basic_string<char,struct std::char_traits<char>,class std::allocator<char> >(void)" (??1?$basic_string@
DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QAE@XZ) already defined in main.obj
msvcprt.lib(MSVCP60.dll) : error LNK2005: "public: class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > & __thiscall std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >::assign(class s
td::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &,unsigned int,unsigned int)" (?assign@?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QAEAAV12@ABV12@II@Z) already defined in main.obj
msvcprt.lib(MSVCP60.dll) : error LNK2005: "private: void __thiscall std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >::_Tidy(bool)" (?_Tidy@?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@AAEX_N@Z) alread
y defined in main.obj
msvcprt.lib(MSVCP60.dll) : error LNK2005: "private: void __thiscall std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >::_Copy(unsigned int)" (?_Copy@?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@AAEXI@Z)
already defined in main.obj
msvcprt.lib(MSVCP60.dll) : error LNK2005: "void __cdecl std::_Xlen(void)" (?_Xlen@std@@YAXXZ) already defined in libcpmt.lib(string.obj)
msvcprt.lib(MSVCP60.dll) : error LNK2005: "public: __thiscall std::ios_base::Init::Init(void)" (??0Init@ios_base@std@@QAE@XZ) already defined in libcpmt.lib(iostream.obj)
msvcprt.lib(MSVCP60.dll) : error LNK2005: "public: __thiscall std::ios_base::Init::~Init(void)" (??1Init@ios_base@std@@QAE@XZ) already defined in libcpmt.lib(iostream.obj)
msvcprt.lib(MSVCP60.dll) : error LNK2005: "public: __thiscall std::_Winit::_Winit(void)" (??0_Winit@std@@QAE@XZ) already defined in libcpmt.lib(wiostrea.obj)
msvcprt.lib(MSVCP60.dll) : error LNK2005: "public: __thiscall std::_Winit::~_Winit(void)" (??1_Winit@std@@QAE@XZ) already defined in libcpmt.lib(wiostrea.obj)
msvcprt.lib(MSVCP60.dll) : error LNK2005: "private: void __thiscall std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >::_Eos(unsigned int)" (?_Eos@?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@AAEXI@Z) a
lready defined in main.obj
msvcprt.lib(MSVCP60.dll) : error LNK2005: "private: bool __thiscall std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >::_Grow(unsigned int,bool)" (?_Grow@?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@AAE
_NI_N@Z) already defined in main.obj
msvcprt.lib(MSVCP60.dll) : error LNK2005: "private: void __thiscall std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >::_Split(void)" (?_Split@?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@AAEXXZ) alread
y defined in main.obj
msvcprt.lib(MSVCP60.dll) : error LNK2005: "void __cdecl std::_Xran(void)" (?_Xran@std@@YAXXZ) already defined in libcpmt.lib(string.obj)
msvcprt.lib(MSVCP60.dll) : error LNK2005: "public: __thiscall std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >(class std::basic_string<cha
r,struct std::char_traits<char>,class std::allocator<char> > const &)" (??0?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QAE@ABV01@@Z) already defined in main.obj
msvcprt.lib(MSVCP60.dll) : error LNK2005: "public: class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > & __thiscall std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >::assign(char co
nst *,unsigned int)" (?assign@?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QAEAAV12@PBDI@Z) already defined in main.obj
msvcprt.lib(MSVCP60.dll) : error LNK2005: "public: class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > & __thiscall std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >::erase(unsigned
int,unsigned int)" (?erase@?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QAEAAV12@II@Z) already defined in main.obj
msvcprt.lib(MSVCP60.dll) : error LNK2005: "public: char const * __thiscall std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >::c_str(void)const " (?c_str@?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QBE
PBDXZ) already defined in main.obj
msvcprt.lib(MSVCP60.dll) : error LNK2005: "public: virtual __thiscall std::strstream::~strstream(void)" (??1strstream@std@@UAE@XZ) already defined in libcpmt.lib(strstrea.obj)
msvcprt.lib(MSVCP60.dll) : error LNK2005: "public: virtual __thiscall std::basic_iostream<char,struct std::char_traits<char> >::~basic_iostream<char,struct std::char_traits<char> >(void)" (??1?$basic_iostream@DU?$char_traits@D@std@@@std@@UAE@XZ) alr
eady defined in main.obj
msvcprt.lib(MSVCP60.dll) : error LNK2005: "public: virtual __thiscall std::basic_ios<char,struct std::char_traits<char> >::~basic_ios<char,struct std::char_traits<char> >(void)" (??1?$basic_ios@DU?$char_traits@D@std@@@std@@UAE@XZ) already defined in
main.obj
msvcprt.lib(MSVCP60.dll) : error LNK2005: "public: __thiscall std::basic_iostream<char,struct std::char_traits<char> >::basic_iostream<char,struct std::char_traits<char> >(class std::basic_streambuf<char,struct std::char_traits<char> > *)" (??0?$bas
ic_iostream@DU?$char_traits@D@std@@@std@@QAE@PAV?$basic_streambuf@DU?$char_traits@D@std@@@1@@Z) already defined in main.obj
msvcprt.lib(MSVCP60.dll) : error LNK2005: "public: void __thiscall std::ios_base::clear(int,bool)" (?clear@ios_base@std@@QAEXH_N@Z) already defined in libcpmt.lib(ios.obj)
msvcprt.lib(MSVCP60.dll) : error LNK2005: "class std::basic_ostream<char,struct std::char_traits<char> > & __cdecl std::operator<<(class std::basic_ostream<char,struct std::char_traits<char> > &,char const *)" (??6std@@YAAAV?$basic_ostream@DU?$char_
traits@D@std@@@0@AAV10@PBD@Z) already defined in main.obj
msvcprt.lib(MSVCP60.dll) : error LNK2005: "public: class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > & __thiscall std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >::append(unsigne
d int,char)" (?append@?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QAEAAV12@ID@Z) already defined in libcpmt.lib(iostream.obj)
msvcprt.lib(MSVCP60.dll) : error LNK2005: "public: virtual __thiscall std::basic_streambuf<char,struct std::char_traits<char> >::~basic_streambuf<char,struct std::char_traits<char> >(void)" (??1?$basic_streambuf@DU?$char_traits@D@std@@@std@@UAE@XZ)
already defined in main.obj
msvcprt.lib(MSVCP60.dll) : error LNK2005: "protected: void __thiscall std::strstreambuf::_Init(int,char *,char *,int)" (?_Init@strstreambuf@std@@IAEXHPAD0H@Z) already defined in libcpmt.lib(strstrea.obj)
msvcprt.lib(MSVCP60.dll) : error LNK2005: "public: __thiscall std::_Lockit::~_Lockit(void)" (??1_Lockit@std@@QAE@XZ) already defined in libcpmt.lib(xlock.obj)
msvcprt.lib(MSVCP60.dll) : error LNK2005: "public: __thiscall std::_Lockit::_Lockit(void)" (??0_Lockit@std@@QAE@XZ) already defined in libcpmt.lib(xlock.obj)
msvcprt.lib(MSVCP60.dll) : error LNK2005: "private: static class std::locale::_Locimp * __cdecl std::locale::_Init(void)" (?_Init@locale@std@@CAPAV_Locimp@12@XZ) already defined in libcpmt.lib(locale0.obj)
msvcprt.lib(MSVCP60.dll) : error LNK2005: "public: virtual __thiscall std::strstreambuf::~strstreambuf(void)" (??1strstreambuf@std@@UAE@XZ) already defined in libcpmt.lib(strstrea.obj)
msvcprt.lib(MSVCP60.dll) : error LNK2005: "public: char & __thiscall std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >::operator[](unsigned int)" (??A?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QAEAAD
I@Z) already defined in main.obj
msvcprt.lib(MSVCP60.dll) : error LNK2005: "private: void __thiscall std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >::_Freeze(void)" (?_Freeze@?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@AAEXXZ) alre
ady defined in main.obj
MSVCRT.lib(MSVCRT.dll) : error LNK2005: _memmove already defined in LIBCMT.lib(memmove.obj)
MSVCRT.lib(MSVCRT.dll) : error LNK2005: _strtol already defined in LIBCMT.lib(strtol.obj)
MSVCRT.lib(MSVCRT.dll) : error LNK2005: _tolower already defined in LIBCMT.lib(tolower.obj)
MSVCRT.lib(MSVCRT.dll) : error LNK2005: "public: int __thiscall type_info::operator==(class type_info const &)const " (??8type_info@@QBEHABV0@@Z) already defined in LIBCMT.lib(typinfo.obj)
MSVCRT.lib(MSVCRT.dll) : error LNK2005: "public: int __thiscall type_info::before(class type_info const &)const " (?before@type_info@@QBEHABV1@@Z) already defined in LIBCMT.lib(typinfo.obj)
LINK : warning LNK4098: defaultlib "MSVCRT" conflicts with use of other libs; use /NODEFAULTLIB:library
Release/prog.exe : fatal error LNK1169: one or more multiply defined symbols found
Error executing link.exe.

:( Any suggestions? ... I have the Multi-Thread option selected, as this is a multi-threaded app. I'm using mySQL++, iostream ... and some other headers..... Pls help :)

When you built some of the other libraries you were using, were they *all* built using the multi-threaded libraries? Everything must match (single/multi-threaded, DLL or static, all of them!), or you get linker errors.

mySQL++ was probably not built with the MT libraries. But I think you can get the source and build it yourself with the MT libraries.