void WelcomeWidget::on_loginBtn_clicked()//点击登录按钮登录时，核对用户名及密码{    /*if(ui->adminCheckBox->isChecked())    {        m_pAdmin->showMaximized();    }    else    {        m_pUser->showMaximized();    }*/    QSqlTableModel model;    model.setTable("User");    model.select();    int userCnt = 0;    for(int i=0;i<model.rowCount();++i)    {        QSqlRecord record=model.record(i);        QString ID= record.value("ID").toString();        QString Password=record.value("Password").toString();        int GroupID=record.value("GroupID").toInt();        if(ui->userNameLineEt->text()==ID)        {            userCnt++;            if(ui->adminCheckBox->isChecked())            {                if(GroupID==1)                {                    if(ui->passwordLineEt->text()==Password)                    {                        data::userID=ID.toInt();                        data::userType=GroupID;                        m_pAdmin=new adminWindow;                        m_pAdmin->setWindowTitle("管理员后台");                        m_pAdmin->showMaximized();                        this->close();                    }                    else                    {                        QMessageBox::information(this,"提示","密码错误！");                    }                }                else                {                    QMessageBox::information(this,"提示","您不具有管理员权限！");                }            }            else            {                if(ui->passwordLineEt->text()==Password)                {                    data::userID=ID.toInt();                    data::userType=GroupID;                    m_pUser=new userWindow;                    m_pUser->setWindowTitle("读者中心");                    m_pUser->showMaximized();                    this->close();                }                else                {                    QMessageBox::information(this,"提示","密码错误！");                }            }        }    }    if(!userCnt)    {        QMessageBox::information(this,"提示","用户不存在！");    }}
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