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oid MainWindow::on_pushButton_clicked()
{
QSqlDatabase db=QSqlDatabase::addDatabase("QMYSQL");
db.setHostName("localhost");
db.setConnectOptions("mysql");
db.setUserName("root");
db.setPassword("123456");

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QtSql>
#include <QMessageBox>
//#include <QSglError>
#include <qsqldatabase.h>


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

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

void MainWindow::on_pushButton_clicked()
{
QSqlDatabase db=QSqlDatabase::addDatabase("QMYSQL");
db.setHostName("127.0.0.1");
db.setDatabaseName("new");
db.setUserName("root");
db.setPassword("12345");
if (!db.open()){
    QMessageBox::critical(0,"Hren ne robit", db.lastError().text());
}
QMessageBox::warning(this, "norm", "Vse robit");
QSqlQuery query;
query.exec("show database");
QString salida;
while(query.next())
{
    salida+=query.value(0).toString()+"\n";
}
ui->textEdit->setText(salida);

}

void MainWindow::on_pushButton_2_clicked()
{
 close();
}