error...

[kazal]

hi, i got this at app output...


QObject::installEventFilter(): Cannot filter events for objects in a different thread.

no error while i try to build my program...its shows that after i build.. but
what it means?

[aamer4yu]

You are probably trying to install filter on some object, which is part of another thread..
If you show the code, may be we can tell better

[kazal]

well i dont understand what it means..huhuh

now i try write database using progrmmg..

this my mainwindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H
 
#include <QMainWindow>
#include <QWidget>
 
class QComboBox;
class QDataWidgetMapper;
class QItemSelectionModel;
class QLabel;
class QLineEdit;
class QPushButton;
class QSqlRelationalTableModel;
class QStandardItemModel;
class QStringListModel;
class QTextEdit;
 
class MainWindow : public QMainWindow {
    Q_OBJECT
public:
    MainWindow(QWidget *parent = 0);
 
private slots:
    void updateButton(int row);
 
private:
    void setupModel();
 
    QLabel *label;
    QTextEdit *textEdit;
    QComboBox *comboBox;
    QPushButton *pushButton;
 
    QSqlRelationalTableModel *model;
    QItemSelectionModel *selectionModel;
    QDataWidgetMapper *mapper;
 
 
 
};
 
#endif // MAINWINDOW_H

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QWidget>

class QComboBox;
class QDataWidgetMapper;
class QItemSelectionModel;
class QLabel;
class QLineEdit;
class QPushButton;
class QSqlRelationalTableModel;
class QStandardItemModel;
class QStringListModel;
class QTextEdit;

class MainWindow : public QMainWindow {
    Q_OBJECT
public:
    MainWindow(QWidget *parent = 0);

private slots:
    void updateButton(int row);

private:
    void setupModel();

    QLabel *label;
    QTextEdit *textEdit;
    QComboBox *comboBox;
    QPushButton *pushButton;

    QSqlRelationalTableModel *model;
    QItemSelectionModel *selectionModel;
    QDataWidgetMapper *mapper;



};

#endif // MAINWINDOW_H

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mainwindow.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QSqlTableModel>
#include <QDataWidgetMapper>
#include <QSqlRelationalDelegate>
#include <QSqlRelationalTableModel>
#include <QMessageBox>
#include <QSqlQuery>
 
MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent)
 
{
    setupModel();
 
    mapper = new QDataWidgetMapper(this);
    mapper->setModel(model);
    mapper->setItemDelegate(new QSqlRelationalDelegate(this));
    mapper->addMapping(comboBox, model->fieldIndex("name"));
    mapper->addMapping(textEdit, model->fieldIndex("address"));
 
 
    connect(pushButton, SIGNAL(clicked()),
            mapper, SLOT(updateButton(int)));
 
    setWindowTitle(tr("WiseAviation"));
    mapper->toFirst();
 
 
}
 
void MainWindow::setupModel()
{
    QSqlDatabase db = QSqlDatabase::addDatabase("QMYSQL");
    db.setHostName("localhost");
    db.setDatabaseName("wiseavi");
    db.setUserName("root");
    db.setPassword("root");
    if (!db.open()) {
        QMessageBox::critical(0, tr("Cannot open database"),
            tr("Unable to establish a database connection.\n"
               "This example needs SQMySQL support. Please read "
               "the Qt SQL driver documentation for information how "
               "to build it."), QMessageBox::Cancel);
        return;
    }
 
    QSqlQuery query;
    query.exec("create table workers (name varchar(20), address varchar(200)");
    query.exec("insert into workers values( 'Siti', "
               "'Sabah')");
    query.exec("insert into workers values( 'Atun', "
               "'Perak')");
    query.exec("insert into workers values( 'fifa', "
               "'kedah')");
 
 
    model = new QSqlRelationalTableModel(this);
    model->setTable("workers");
    model->setEditStrategy(QSqlTableModel::OnManualSubmit);
    model->setEditStrategy(QSqlTableModel::OnFieldChange);
    model->select();
 
 
 
}
 
void MainWindow::updateButton(int row)
{
    pushButton->update();
}

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QSqlTableModel>
#include <QDataWidgetMapper>
#include <QSqlRelationalDelegate>
#include <QSqlRelationalTableModel>
#include <QMessageBox>
#include <QSqlQuery>

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent)

{
    setupModel();

    mapper = new QDataWidgetMapper(this);
    mapper->setModel(model);
    mapper->setItemDelegate(new QSqlRelationalDelegate(this));
    mapper->addMapping(comboBox, model->fieldIndex("name"));
    mapper->addMapping(textEdit, model->fieldIndex("address"));


    connect(pushButton, SIGNAL(clicked()),
            mapper, SLOT(updateButton(int)));

    setWindowTitle(tr("WiseAviation"));
    mapper->toFirst();


}

void MainWindow::setupModel()
{
    QSqlDatabase db = QSqlDatabase::addDatabase("QMYSQL");
    db.setHostName("localhost");
    db.setDatabaseName("wiseavi");
    db.setUserName("root");
    db.setPassword("root");
    if (!db.open()) {
        QMessageBox::critical(0, tr("Cannot open database"),
            tr("Unable to establish a database connection.\n"
               "This example needs SQMySQL support. Please read "
               "the Qt SQL driver documentation for information how "
               "to build it."), QMessageBox::Cancel);
        return;
    }

    QSqlQuery query;
    query.exec("create table workers (name varchar(20), address varchar(200)");
    query.exec("insert into workers values( 'Siti', "
               "'Sabah')");
    query.exec("insert into workers values( 'Atun', "
               "'Perak')");
    query.exec("insert into workers values( 'fifa', "
               "'kedah')");


    model = new QSqlRelationalTableModel(this);
    model->setTable("workers");
    model->setEditStrategy(QSqlTableModel::OnManualSubmit);
    model->setEditStrategy(QSqlTableModel::OnFieldChange);
    model->select();



}

void MainWindow::updateButton(int row)
{
    pushButton->update();
}

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main.cpp

#include <QtGui/QApplication>
#include "mainwindow.h"
 
int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MainWindow w;
    w.show();
    return a.exec();
}

#include <QtGui/QApplication>
#include "mainwindow.h"

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MainWindow w;
    w.show();
    return a.exec();
}

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[tbscope]

This is probably not going to solve your problem, but it's an error nontheless.

connect(pushButton, SIGNAL(clicked()), mapper, SLOT(updateButton(int)));

connect(pushButton, SIGNAL(clicked()), mapper, SLOT(updateButton(int)));

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This is wrong for at least two reasons:
1. slots can not have more parameters than signals
2. mapper doesn't contain a slot called updateButton(int)

[aamer4yu]

Am not sure where the installEventFilter code is coming from.
But my guess is mapper->setItemDelegate(new QSqlRelationalDelegate(this));
this is QMainWindow, and you need to assign a view(QTableView) to the delegate.
And you havent created a view !!

[kazal]

i still don't understand..
i use textedit to view ..

could u please to give some code or example to show my data on table?