#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(shù)據(jù)庫

private slots:
 void on_pushButton_clicked();

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

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(shù)據(jù)庫連接
}

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


//登錄驗(yàn)證賬號(hào)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(duì)",QMessageBox::Ok);
 }
 else{

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

}
//MD5加密函數(shù)
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(shù)據(jù)到加密哈希值

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

 QString md5 =resultArray.toHex();//轉(zhuǎn)換為16進(jìn)制字符串

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

 //數(shù)據(jù)庫連接
 db = QSqlDatabase::addDatabase("QOCI");
 db.setHostName("192.168.1.100");//數(shù)據(jù)庫服務(wù)器ip
 db.setPort(1521);//數(shù)據(jù)庫端口號(hào)
 db.setDatabaseName("orcl");//數(shù)據(jù)庫名稱
 db.setUserName("dbUserName");//數(shù)據(jù)庫用戶名
 db.setPassword("dbUserPassword");//數(shù)據(jù)庫密碼
 db.open();

}