fatecasino
24th February 2011, 16:03
I am trying to work with the SQL example here (http://doc.trolltech.com/latest/sql-tablemodel-tablemodel-cpp.html)
but instead of the tableviews, two blank windows appear!!
I cannot find the error!
#include <QtGui>
#include <QtSql>
//#include "../connection.h"
void initializeModel(QSqlTableModel *model)
{
model->setTable("person");
model->setEditStrategy(QSqlTableModel::OnManualSubmit);
model->select();
model->setHeaderData(0, Qt::Horizontal, QObject::tr("ID"));
model->setHeaderData(1, Qt::Horizontal, QObject::tr("First name"));
model->setHeaderData(2, Qt::Horizontal, QObject::tr("Last name"));
}
QTableView *createView(const QString &title, QSqlTableModel *model)
{
QTableView *view = new QTableView;
view->setModel(model);
view->setWindowTitle(title);
return view;
}
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
// if (!createConnection())
// return 1;
QSqlTableModel model;
initializeModel(&model);
QTableView *view1 = createView(QObject::tr("Table Model (View 1)"), &model);
QTableView *view2 = createView(QObject::tr("Table Model (View 2)"), &model);
view1->show();
view2->move(view1->x() + view1->width() + 20, view1->y());
view2->show();
return app.exec();
}
Added after 20 minutes:
that was simply because I had ignored the "connection.h" file. I thought that if the tableview has no data, it will simply show empty cells.
#ifndef CONNECTION_H
#define CONNECTION_H
#include <QSqlQuery>
#include <QMessageBox>
static bool createConnection()
{
QSqlDatabase db = QSqlDatabase::addDatabase("QSQLITE");
db.setDatabaseName(":memory:");
if (!db.open()) {
QMessageBox::critical(0, qApp->tr("Cannot open database"),
qApp->tr("Unable to establish a database connection.\n"
"This example needs SQLite support. Please read "
"the Qt SQL driver documentation for information how "
"to build it.\n\n"
"Click Cancel to exit."), QMessageBox::Cancel);
return false;
}
QSqlQuery query;
query.exec("create table person (id int primary key, "
"firstname varchar(20), lastname varchar(20))");
query.exec("insert into person values(101, 'Danny', 'Young')");
query.exec("insert into person values(102, 'Christine', 'Holand')");
query.exec("insert into person values(103, 'Lars', 'Gordon')");
query.exec("insert into person values(104, 'Roberto', 'Robitaille')");
query.exec("insert into person values(105, 'Maria', 'Papadopoulos')");
query.exec("create table offices (id int primary key,"
"imagefile int,"
"location varchar(20),"
"country varchar(20),"
"description varchar(100))");
query.exec("insert into offices "
"values(0, 0, 'Oslo', 'Norway',"
"'Oslo is home to more than 500 000 citizens and has a "
"lot to offer.It has been called \"The city with the big "
"heart\" and this is a nickname we are happy to live up to.')");
query.exec("insert into offices "
"values(1, 1, 'Brisbane', 'Australia',"
"'Brisbane is the capital of Queensland, the Sunshine State, "
"where it is beautiful one day, perfect the next. "
"Brisbane is Australia''s 3rd largest city, being home "
"to almost 2 million people.')");
query.exec("insert into offices "
"values(2, 2, 'Redwood City', 'US',"
"'You find Redwood City in the heart of the Bay Area "
"just north of Silicon Valley. The largest nearby city is "
"San Jose which is the third largest city in California "
"and the 10th largest in the US.')");
query.exec("insert into offices "
"values(3, 3, 'Berlin', 'Germany',"
"'Berlin, the capital of Germany is dynamic, cosmopolitan "
"and creative, allowing for every kind of lifestyle. "
"East meets West in the metropolis at the heart of a "
"changing Europe.')");
query.exec("insert into offices "
"values(4, 4, 'Munich', 'Germany',"
"'Several technology companies are represented in Munich, "
"and the city is often called the \"Bavarian Silicon Valley\". "
"The exciting city is also filled with culture, "
"art and music. ')");
query.exec("insert into offices "
"values(5, 5, 'Beijing', 'China',"
"'Beijing as a capital city has more than 3000 years of "
"history. Today the city counts 12 million citizens, and "
"is the political, economic and cultural centre of China.')");
query.exec("create table images (locationid int, file varchar(20))");
query.exec("insert into images values(0, 'images/oslo.png')");
query.exec("insert into images values(1, 'images/brisbane.png')");
query.exec("insert into images values(2, 'images/redwood.png')");
query.exec("insert into images values(3, 'images/berlin.png')");
query.exec("insert into images values(4, 'images/munich.png')");
query.exec("insert into images values(5, 'images/beijing.png')");
return true;
}
#endif // CONNECTION_H
Added after 1:
I don't really understand the "connection.h" function!
I have created a simple model but it does not show up because it has no data!
QSqlTableModel* tm = new QSqlTableModel(this);
tm->setEditStrategy(QSqlTableModel::OnFieldChange);
tm->setTable("vorgang");
tm->select();
tm->setHeaderData(0, Qt::Horizontal, tr("id"));
tm->setHeaderData(1, Qt::Horizontal, tr("Start"));
tm->setHeaderData(2, Qt::Horizontal, tr("End"));
if (!tm->select()) {
qDebug() << "select nok";
}
//set up the view
QTableView* tv = new QTableView(this);
tv->setModel(tm);
tv->resizeColumnsToContents();
tv->setWindowTitle("pame");
How can i do this simple thing:
I want to have blank cells, that the user will fill in and update the database?
but instead of the tableviews, two blank windows appear!!
I cannot find the error!
#include <QtGui>
#include <QtSql>
//#include "../connection.h"
void initializeModel(QSqlTableModel *model)
{
model->setTable("person");
model->setEditStrategy(QSqlTableModel::OnManualSubmit);
model->select();
model->setHeaderData(0, Qt::Horizontal, QObject::tr("ID"));
model->setHeaderData(1, Qt::Horizontal, QObject::tr("First name"));
model->setHeaderData(2, Qt::Horizontal, QObject::tr("Last name"));
}
QTableView *createView(const QString &title, QSqlTableModel *model)
{
QTableView *view = new QTableView;
view->setModel(model);
view->setWindowTitle(title);
return view;
}
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
// if (!createConnection())
// return 1;
QSqlTableModel model;
initializeModel(&model);
QTableView *view1 = createView(QObject::tr("Table Model (View 1)"), &model);
QTableView *view2 = createView(QObject::tr("Table Model (View 2)"), &model);
view1->show();
view2->move(view1->x() + view1->width() + 20, view1->y());
view2->show();
return app.exec();
}
Added after 20 minutes:
that was simply because I had ignored the "connection.h" file. I thought that if the tableview has no data, it will simply show empty cells.
#ifndef CONNECTION_H
#define CONNECTION_H
#include <QSqlQuery>
#include <QMessageBox>
static bool createConnection()
{
QSqlDatabase db = QSqlDatabase::addDatabase("QSQLITE");
db.setDatabaseName(":memory:");
if (!db.open()) {
QMessageBox::critical(0, qApp->tr("Cannot open database"),
qApp->tr("Unable to establish a database connection.\n"
"This example needs SQLite support. Please read "
"the Qt SQL driver documentation for information how "
"to build it.\n\n"
"Click Cancel to exit."), QMessageBox::Cancel);
return false;
}
QSqlQuery query;
query.exec("create table person (id int primary key, "
"firstname varchar(20), lastname varchar(20))");
query.exec("insert into person values(101, 'Danny', 'Young')");
query.exec("insert into person values(102, 'Christine', 'Holand')");
query.exec("insert into person values(103, 'Lars', 'Gordon')");
query.exec("insert into person values(104, 'Roberto', 'Robitaille')");
query.exec("insert into person values(105, 'Maria', 'Papadopoulos')");
query.exec("create table offices (id int primary key,"
"imagefile int,"
"location varchar(20),"
"country varchar(20),"
"description varchar(100))");
query.exec("insert into offices "
"values(0, 0, 'Oslo', 'Norway',"
"'Oslo is home to more than 500 000 citizens and has a "
"lot to offer.It has been called \"The city with the big "
"heart\" and this is a nickname we are happy to live up to.')");
query.exec("insert into offices "
"values(1, 1, 'Brisbane', 'Australia',"
"'Brisbane is the capital of Queensland, the Sunshine State, "
"where it is beautiful one day, perfect the next. "
"Brisbane is Australia''s 3rd largest city, being home "
"to almost 2 million people.')");
query.exec("insert into offices "
"values(2, 2, 'Redwood City', 'US',"
"'You find Redwood City in the heart of the Bay Area "
"just north of Silicon Valley. The largest nearby city is "
"San Jose which is the third largest city in California "
"and the 10th largest in the US.')");
query.exec("insert into offices "
"values(3, 3, 'Berlin', 'Germany',"
"'Berlin, the capital of Germany is dynamic, cosmopolitan "
"and creative, allowing for every kind of lifestyle. "
"East meets West in the metropolis at the heart of a "
"changing Europe.')");
query.exec("insert into offices "
"values(4, 4, 'Munich', 'Germany',"
"'Several technology companies are represented in Munich, "
"and the city is often called the \"Bavarian Silicon Valley\". "
"The exciting city is also filled with culture, "
"art and music. ')");
query.exec("insert into offices "
"values(5, 5, 'Beijing', 'China',"
"'Beijing as a capital city has more than 3000 years of "
"history. Today the city counts 12 million citizens, and "
"is the political, economic and cultural centre of China.')");
query.exec("create table images (locationid int, file varchar(20))");
query.exec("insert into images values(0, 'images/oslo.png')");
query.exec("insert into images values(1, 'images/brisbane.png')");
query.exec("insert into images values(2, 'images/redwood.png')");
query.exec("insert into images values(3, 'images/berlin.png')");
query.exec("insert into images values(4, 'images/munich.png')");
query.exec("insert into images values(5, 'images/beijing.png')");
return true;
}
#endif // CONNECTION_H
Added after 1:
I don't really understand the "connection.h" function!
I have created a simple model but it does not show up because it has no data!
QSqlTableModel* tm = new QSqlTableModel(this);
tm->setEditStrategy(QSqlTableModel::OnFieldChange);
tm->setTable("vorgang");
tm->select();
tm->setHeaderData(0, Qt::Horizontal, tr("id"));
tm->setHeaderData(1, Qt::Horizontal, tr("Start"));
tm->setHeaderData(2, Qt::Horizontal, tr("End"));
if (!tm->select()) {
qDebug() << "select nok";
}
//set up the view
QTableView* tv = new QTableView(this);
tv->setModel(tm);
tv->resizeColumnsToContents();
tv->setWindowTitle("pame");
How can i do this simple thing:
I want to have blank cells, that the user will fill in and update the database?