C++ CLI connect to MySQL

Question

using namespace sql;
using namespace sql::mysql;
sql::Driver* driver;
sql::Connection* con;
sql::Statement* stmt;
sql::ResultSet* res;    

driver = get_driver_instance();

I am using a user-defined function to connect to a MySQL DB. I get an error at get_driver_instance();. The function is inside:

public ref class MyForm2 : public System::Windows::Forms::Form

Error - Severity Code Description Project File Line Suppression State Error LNK2020 unresolved token (0A0006ED) "extern "C" class sql::Driver * __cdecl _get_driver_instance_by_name (char const * const)" (?_get_driver_instance_by_name@@$$J0YAPEAVDriver@sql@@QEBD@Z) CForm1 C:\Users\Admin\source\repos \CForm1\CForm1\MyForm2.obj 1