Creating an SQLite database in Qt
This example shows you how to create an SQLite database in Qt.
Article Metadata
Tested with
SDK: 4.7 and later (also tested 4.8)
Devices(s): Nokia 5800 XpressMusic, Nokia N900
Compatibility
Platform(s): Qt
Article
Keywords: QSqlDatabase, QSQlite, QSqlError
Created: tepaa
(24 Nov 2009)
Reviewed: lilian.moraru
(08 Nov 2012)
Last edited: hamishwillee
(08 Nov 2012)
Contents |
Preconditions
For Maemo SQLite development, the following packages must be installed:
- libqt4-sql
- libqt4-sql-sqlite
- libsqlite3-0
- libsqlite3-dev
Project file (.pro)
Add the following line to your .pro file
QT += sql
Header
#include <QObject>
#include <QSqlDatabase>
#include <QSqlError>
#include <QFile>
class DatabaseManager : public QObject
{
public:
DatabaseManager(QObject *parent = 0);
~DatabaseManager();
public:
bool openDB();
bool deleteDB();
QSqlError lastError();
private:
QSqlDatabase db;
};
Source
bool DatabaseManager::openDB()
{
// Find QSLite driver
db = QSqlDatabase::addDatabase("QSQLITE");
#ifdef Q_OS_LINUX
// NOTE: We have to store database file into user home folder in Linux
QString path(QDir::home().path());
path.append(QDir::separator()).append("my.db.sqlite");
path = QDir::toNativeSeparators(path);
db.setDatabaseName(path);
#else
// NOTE: File exists in the application private folder, in Symbian Qt implementation
db.setDatabaseName("my.db.sqlite");
#endif
// Open databasee
return db.open();
}
QSqlError DatabaseManager::lastError()
{
// If opening database has failed user can ask
// error description by QSqlError::text()
return db.lastError();
}
bool DatabaseManager::deleteDB()
{
// Close database
db.close();
#ifdef Q_OS_LINUX
// NOTE: We have to store database file into user home folder in Linux
QString path(QDir::home().path());
path.append(QDir::separator()).append("my.db.sqlite");
path = QDir::toNativeSeparators(path);
return QFile::remove(path);
#else
// Remove created database binary file
return QFile::remove("my.db.sqlite");
#endif
}
Postconditions
The database binary file is created on the device disk in Symbian & Windows and in the device memory in Maemo.
