#ifndef MAINWINDOW_H
#define MAINWINDOW_H
QT += core gui sql
#include <QMainWindow>
#include <QtSql>
#include <QVariant>
#include <QDebug>
namespace Ui {
class MainWindow;
}
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
explicit MainWindow(QWidget *parent = 0);
~MainWindow();
private slots:
void on_listButton_clicked();
void on_add_clicked();
private:
Ui::MainWindow *ui;
//数据库句并
QSqlDatabase db;
};
#endif // MAINWINDOW_H
#include "mainwindow.h"
#include "ui_mainwindow.h"
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
}
MainWindow::~MainWindow()
{
delete ui;
}
void MainWindow::on_listButton_clicked()
{
this->db = QSqlDatabase::addDatabase("MYSQL");
this->db.setHostName("localhost");
this->db.setUserName("root");
this->db.setPassword("selen4955");
this->db.setDatabaseName("student");
bool ok = db.open();
if(ok)
{
}
else
{
qDebug()<<"error open database because"<<this->db.lastError().text();
}
//执行命令
QSqlQuery query;
query.exec("select * from student");
//返回一个结构集
while(query.next())
{
// query.value 是QVariant类型
int id=query.value(0).toInt();
QString name=query.value(1).toString();
qDebug()<<id<<name;
}
this->db.close();
}
void MainWindow::on_add_clicked()
{
if(this->db.isOpen())
{
qDebug()<<"db is open";
}
else
{//错误信息
qDebug()<<"error open database because"<<this->db.lastError().text();
}
this->db = QSqlDatabase::addDatabase("MYSQL");
this->db.setHostName("localhost");
this->db.setUserName("root");
this->db.setPassword("selen4955");
this->db.setDatabaseName("student");
bool ok = db.open();
if(ok)
{
QSqlQuery query;
//先匹配在绑定
query.prepare("INSERT INTO person (id, name) "
"VALUES (:id, :name)");
query.bindValue(":id",ui->lineEdit->text());
query.bindValue(":forename", ui->lineEdit_2->text());
bool ok =query.exec();
if(ok)
{
qDebug()<<"insert ok";
}
else
{
qDebug()<<"insert error";
}
}
else
{
qDebug()<<"error open database because"<<this->db.lastError().text();
}
}
