我正在做一项学校作业，我们为此提供了一些 .lib 文件。我将它们添加到链接器中，但仍然出现链接器错误。当我将它们更改为不同的路径时，我得到了一个找不到文件的错误。我的错误是：
Error 53 error LNK2019: unresolved external symbol "__declspec(dllimport) public: __thiscall sql::SQLString::~SQLString(void)" (__imp_??1SQLString@sql@@QAE@XZ) referenced in function "public: static class std::vector<class Address *,class std::allocator<class Address *> > __cdecl AddressDAO::findAddressByCity(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >)" (?findAddressByCity@AddressDAO@@SA?AV?$vector@PAVAddress@@V?$allocator@PAVAddress@@@std@@@std@@V?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@3@@Z) C:\Users\Kenny\Documents\software project\Groep 6\Docs\Dev-Branch-Kenny\KiaDealer\KiaDealer\AddressDAO.obj
Error 54 error LNK2001: unresolved external symbol "__declspec(dllimport) public: __thiscall sql::SQLString::~SQLString(void)" (__imp_??1SQLString@sql@@QAE@XZ) C:\Users\Kenny\Documents\software project\Groep 6\Docs\Dev-Branch-Kenny\KiaDealer\KiaDealer\DatabaseSingleton.obj
Error 55 error LNK2019: unresolved external symbol "__declspec(dllimport) public: __thiscall sql::SQLString::SQLString(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &)" (__imp_??0SQLString@sql@@QAE@ABV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@@Z) referenced in function "public: static class std::vector<class Address *,class std::allocator<class Address *> > __cdecl AddressDAO::findAddressByCity(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >)" (?findAddressByCity@AddressDAO@@SA?AV?$vector@PAVAddress@@V?$allocator@PAVAddress@@@std@@@std@@V?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@3@@Z) C:\Users\Kenny\Documents\software project\Groep 6\Docs\Dev-Branch-Kenny\KiaDealer\KiaDealer\AddressDAO.obj
Error 56 error LNK2019: unresolved external symbol "__declspec(dllimport) public: __thiscall sql::SQLString::SQLString(char const * const)" (__imp_??0SQLString@sql@@QAE@QBD@Z) referenced in function "public: static class std::vector<class Address *,class std::allocator<class Address *> > __cdecl AddressDAO::findAddressByCity(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >)" (?findAddressByCity@AddressDAO@@SA?AV?$vector@PAVAddress@@V?$allocator@PAVAddress@@@std@@@std@@V?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@3@@Z) C:\Users\Kenny\Documents\software project\Groep 6\Docs\Dev-Branch-Kenny\KiaDealer\KiaDealer\AddressDAO.obj
Error 57 error LNK2001: unresolved external symbol "__declspec(dllimport) public: __thiscall sql::SQLString::SQLString(char const * const)" (__imp_??0SQLString@sql@@QAE@QBD@Z) C:\Users\Kenny\Documents\software project\Groep 6\Docs\Dev-Branch-Kenny\KiaDealer\KiaDealer\DatabaseSingleton.obj
Error 58 error LNK2019: unresolved external symbol "__declspec(dllimport) public: __thiscall sql::SQLString::operator class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &(void)const " (__imp_??BSQLString@sql@@QBEABV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@XZ) referenced in function "public: static class std::vector<class Address *,class std::allocator<class Address *> > __cdecl AddressDAO::findAddressByCity(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >)" (?findAddressByCity@AddressDAO@@SA?AV?$vector@PAVAddress@@V?$allocator@PAVAddress@@@std@@@std@@V?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@3@@Z) C:\Users\Kenny\Documents\software project\Groep 6\Docs\Dev-Branch-Kenny\KiaDealer\KiaDealer\AddressDAO.obj
Error 59 error LNK2019: unresolved external symbol __imp__get_driver_instance referenced in function "private: __thiscall DatabaseSingleton::DatabaseSingleton(void)" (??0DatabaseSingleton@@AAE@XZ) C:\Users\Kenny\Documents\software project\Groep 6\Docs\Dev-Branch-Kenny\KiaDealer\KiaDealer\DatabaseSingleton.obj
Error 60 error LNK1120: 5 unresolved externals C:\Users\Kenny\Documents\software project\Groep 6\Docs\Dev-Branch-Kenny\KiaDealer\Debug\KiaDealer.exe
我无法编译它。我什至尝试将项目从 unicode 更改为其他选项，因为我读到这解决了某人的这些错误之一的问题。
编辑，我也收到很多这些警告，它们可能是相关的：Warning 1 warning C4251: 'sql::SQLString::realStr' : class 'std::basic_string<_Elem,_Traits,_Alloc>' need to have 'sql::SQLString' 类的客户端使用的 dll 接口 c:\users\kenny\documents\software project\groep 6\docs\dev-branch-kenny\kiadealer\kiadealer\include\cppconn\sqlstring.h 38