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main.obj:-1: error: LNK2019: unresolved external symbol "__declspec(dllimport) public: __thiscall QSqlDatabase::~QSqlDatabase(void)" (_imp??1QSqlDatabase@@QAE@XZ) referenced in function "bool __cdecl lidhDatabase(void)" (?lidhDatabase@@YA_NXZ)
Hi and welcome to devnet,
Did you add @QT += sql@
to your pro file ?