QtSQL连接查询SQLite3的使用方法示例

]#include <QtCore/QCoreApplication>
#include <QtSql/qsql.h>
#include <QSqlDatabase>
#include <QSqlQuery>
#include <iostream>
#include <QString>
#include <QVariant>
#include <QDebug>
using namespace std;
int main(int argc, char *argv[])
{
QCoreApplication a(argc, argv);
QSqlDatabase db = QSqlDatabase::addDatabase("QSQLITE");
db.setDatabaseName("./memory.xdb");
db.open();
cout << "Let's begin....../n";
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')");
query.exec("select * from offices");
while (query.next()) {
int id = query.value(0).toInt();
int imagefile = query.value(1).toInt();
QString location = query.value(2).toString();
QString country = query.value(3).toString();
QString description = query.value(4).toString();
qDebug() << "id = " <<id
<< "imagefile = "<< imagefile
<< "location = " <<location
<< "country = " << country
<< "description : " << description  <<"/n";
}
db.close();
cout << "/nOK./n";

return a.exec();
}

#-------------------------------------------------
#
# Project created by QtCreator 2010-11-25T09:29:58
#
#-------------------------------------------------
QT       += core sql
QT       -= gui
TARGET = MyManage
CONFIG   += console
CONFIG   -= app_bundle
TEMPLATE = app

SOURCES += main.cpp

#include <QtSql/qsql.h>
#include <QSqlDatabase>
#include <QSqlQuery>
#include <iostream>
#include <QString>
#include <QVariant>
#include <QDebug>