QT連接Oracle數據庫並實現登錄驗證的操作步驟

#ifndef LOGINFORM_H
#define LOGINFORM_H

#include <QMainWindow>
#include <QSqlDatabase>
#include <QSqlQuery>


QT_BEGIN_NAMESPACE
namespace Ui { class LoginForm; }
QT_END_NAMESPACE

class LoginForm : public QMainWindow
{
 Q_OBJECT

public:
 LoginForm(QWidget *parent = nullptr);
 ~LoginForm();

 void initsql(); //初始化數據庫

private slots:
 void on_pushButton_clicked();

 QString encrypt(const QString &str);//自定義加密函數

private:
 Ui::LoginForm *ui;
 QSqlDatabase db;
 QSqlQuery *query;
};
#endif // LOGINFORM_H

#include "loginform.h"
#include "ui_loginform.h"

#include <QStackedWidget>
#include <QMessageBox>
#include <QDebug>
#include <QWidget>
#include <QCryptographicHash>


LoginForm::LoginForm(QWidget *parent)
 : QMainWindow(parent)
 , ui(new Ui::LoginForm)
{
 ui->setupUi(this);

 initsql();//打開數據庫連接
}

LoginForm::~LoginForm()
{
 delete ui;
}


//登錄驗證賬號密碼是否正確
void LoginForm::on_pushButton_clicked()
{
 //獲得用戶和密碼
 QString name=ui->lineEdit->text();
 QString password=ui->lineEdit_2->text();

 QByteArray ba = password.toUtf8();
 QByteArray md5Password = QCryptographicHash::hash(password.toUtf8(), QCryptographicHash::Md5).toHex();

 QString str=QString("select * from USER where UserName='%1' and Password='%2'").arg(name).arg(encrypt(password));
 qDebug()<<str;
 query=new QSqlQuery;
 query->exec(str);
 query->last();
 int record=query->at()+1;
 if(record==0){
  QMessageBox::information(this,"提示","用戶或密碼不對",QMessageBox::Ok);
 }
 else{

  QMessageBox::information(this,"提示","系統登錄成功",QMessageBox::Ok);
 }

}
//MD5加密函數
QString LoginForm::encrypt(const QString &str)
{
 //字符串MD5算法加密
 QByteArray btArray;

 btArray.append(str);//加入原始字符串

 QCryptographicHash hash(QCryptographicHash::Md5); //Md5加密算法

 hash.addData(btArray); //添加數據到加密哈希值

 QByteArray resultArray =hash.result(); //返回最終的哈希值

 QString md5 =resultArray.toHex();//轉換為16進制字符串

 return md5.toUpper();
}
//初始化打開數據庫連接
void LoginForm::initsql()
{
 /*若輸出列表中出現QOCI8和QOCI，則表示驅動加載成功*/
 QStringList drivers = QSqlDatabase::drivers();
 foreach(QString driver, drivers)
 qDebug() <<"\t" << driver;

 //數據庫連接
 db = QSqlDatabase::addDatabase("QOCI");
 db.setHostName("192.168.1.100");//數據庫服務器ip
 db.setPort(1521);//數據庫端口號
 db.setDatabaseName("orcl");//數據庫名稱
 db.setUserName("dbUserName");//數據庫用戶名
 db.setPassword("dbUserPassword");//數據庫密碼
 db.open();

}