Problem with C++ and jdbc

[K0L4N]

Hi, I made phonebook program, I don't have any syntax error, but when I try to compile it in VSCode I get this error message and my program doesn't start:

Error Message

C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/13.1.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:\Users\Jakub\AppData\Local\Temp\ccdsJOYi.o:main.cpp:(.text+0x1f): undefined reference to check(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)' C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/13.1.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:\Users\Jakub\AppData\Local\Temp\ccdsJOYi.o:main.cpp:(.text+0x53): undefined reference to check(std::map<std::__cxx11::basic_string<char, std::char_traits, std::allocator >, std::__cxx11::basic_string<char, std::char_traits, std::allocator >, std::less<std::__cxx11::basic_string<char, std::char_traits, std::allocator > >, std::allocator<std::pair<std::__cxx11::basic_string<char, std::char_traits, std::allocator > const, std::__cxx11::basic_string<char, std::char_traits, std::allocator > > > > const&)'
C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/13.1.0/../../../../x86_64-w64-mingw32/bin/ld.exe: C:\Users\Jakub\AppData\Local\Temp\ccdsJOYi.o:main.cpp:(.text+0xba): undefined reference to `sql::mysql::_get_driver_instance_by_name(char const*)'
collect2.exe: error: ld returned 1 exit status

How can I fix this issue? Thanks for help in advance

[sean-mcmanus]

It sounds like you may need to explicitly instantiate the template so that the definition gets generated from the template. You can search online for that. Maybe https://stackoverflow.com/questions/4933056/how-do-i-explicitly-instantiate-a-template-function .