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error: no matching function for call to 'QSqlQuery::addBindValue(std::string&)'

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I have this code include <iostream> include<QSqlDatabase> include<QSqlQuery> #include <hyrje.h> using namespace std; class Votuesi { private: string v_id,emeri,mbiemer,atesia,qarkui,passi; public: bool lidhDatabase(); void identifikohu(); Votuesi(string ,string ,string ); void publiko(){ cout<<v_id<<qarkui<<passi;}}; Votuesi::Votuesi(string a,string b,string c){ emeri=a; qarkui=b; passi=c;} //Metode e cila ben te mundur lidhjen e programit me database-in bool lidhDatabase(){ QSqlDatabase db = QSqlDatabase::addDatabase("QMYSQL"); db.setHostName("localhost"); db.setDatabaseName("evoting"); db.setUserName("root"); db.setPassword(""); if (!db.open()) return cout<<"Lidhja me database-in nuk mund te behet "; } return cout<<"Lidhja me database-in u krye me sukses";} //Metode e cila ben te mundur identifikimin e numrit te identitetit te votuesit void Votuesi::identifikohu(){ QSqlQuery query; query.prepare("SELECT * FROM evoting WHERE emer = ? and qyteti = ? and pass = ?"); query.addBindValue(this->emeri); query.addBindValue(this->qarkui); query.addBindValue(this->passi); query.exec(); if(query.size()> 0){ query.next();{ else{ cout<<"Te dhenat qe ju vendoset nuk jane te sakta";}} int main(){ Votuesi votues("Amarda","Tirane","amarda"); votues.lidhDatabase(); votues.publiko(); votues.identifikohu();} what should I do to give the query my values of constructor ?

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