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+ −
#ifndef CONNECTION_H+ −
#define CONNECTION_H+ −
+ −
#include <QMessageBox>+ −
#include <QSqlDatabase>+ −
#include <QSqlError>+ −
#include <QSqlQuery>+ −
+ −
/*+ −
This file defines a helper function to open a connection to an+ −
in-memory SQLITE database and to create a test table.+ −
+ −
If you want to use another database, simply modify the code+ −
below. All the examples in this directory use this function to+ −
connect to a database.+ −
*/+ −
//! [0]+ −
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;+ −
}+ −
//! [0]+ −
+ −
#endif+ −