Question

请教高手如何使用QT建立SQLite数据库

Answer 1

#include <QtGui>
#include <QtSql>

#include "scooterwindow.h"

ScooterWindow::ScooterWindow()
{
model = new QSqlTableModel(this);
model->setTable("scooter");
model->setSort(Scooter_Name, Qt::AscendingOrder);
model->setHeaderData(Scooter_Name, Qt::Horizontal, tr("Name"));
model->setHeaderData(Scooter_MaxSpeed, Qt::Horizontal, tr("MPH"));
model->setHeaderData(Scooter_MaxRange, Qt::Horizontal, tr("Miles"));
model->setHeaderData(Scooter_Weight, Qt::Horizontal, tr("Lbs"));
model->setHeaderData(Scooter_Description, Qt::Horizontal,
tr("Description"));
model->select();

view = new QTableView;
view->setModel(model);
view->setSelectionMode(QAbstractItemView::SingleSelection);
view->setSelectionBehavior(QAbstractItemView::SelectRows);
view->setColumnHidden(Scooter_Id, true);
view->resizeColumnsToContents();
view->setEditTriggers(QAbstractItemView::NoEditTriggers);

QHeaderView *header = view->horizontalHeader();
header->setStretchLastSection(true);

QHBoxLayout *mainLayout = new QHBoxLayout;
mainLayout->addWidget(view);
setLayout(mainLayout);

setWindowTitle(tr("Scooters"));
}

#ifndef SCOOTERWINDOW_H
#define SCOOTERWINDOW_H

#include <QWidget>

class QSqlTableModel;
class QTableView;

enum {
Scooter_Id = 0,
Scooter_Name = 1,
Scooter_MaxSpeed = 2,
Scooter_MaxRange = 3,
Scooter_Weight = 4,
Scooter_Description = 5
};

class ScooterWindow : public QWidget
{
Q_OBJECT

public:
ScooterWindow();

private:
QSqlTableModel *model;
QTableView *view;
};

#endif

#include <QtGui>
#include <QtSql>

#include "scooterwindow.h"

bool createConnection()
{
QSqlDatabase db = QSqlDatabase::addDatabase("QSQLITE");
db.setDatabaseName("scooters.dat");
if (!db.open()) {
QMessageBox::warning(0, QObject::tr("Database Error"),
db.lastError().text());
return false;
}
return true;
}

void createFakeData()
{
QSqlQuery query;
query.exec("DROP TABLE scooter");

query.exec("CREATE TABLE scooter ("
"id INTEGER PRIMARY KEY AUTOINCREMENT, "
"name VARCHAR(40) NOT NULL, "
"maxspeed INTEGER NOT NULL, "
"maxrange INTEGER NOT NULL, "
"weight INTEGER NOT NULL, "
"description VARCHAR(80) NOT NULL)");
query.exec("INSERT INTO scooter (name, maxspeed, "
"maxrange, weight, description) "
"VALUES ('Mod-Rad 1500', 40, 35, 298, "
"'Speedometer, odometer, battery meter, turn signal "
"indicator, locking steering column')");
query.exec("INSERT INTO scooter (name, maxspeed, "
"maxrange, weight, description) "
"VALUES ('Rad2Go Great White E36', 22, 12, 93, "
"'10\" airless tires')");
query.exec("INSERT INTO scooter (name, maxspeed, "
"maxrange, weight, description) "
"VALUES ('X-Treme X360', 21, 14, 59, "
"'Cargo rack, foldable')");
query.exec("INSERT INTO scooter (name, maxspeed, "
"maxrange, weight, description) "
"VALUES ('Vego SX 600', 20, , 76, "
"'Two interchangeable batteries, foldable')");
query.exec("INSERT INTO scooter (name, maxspeed, "
"maxrange, weight, description) "
"VALUES ('Sunbird E Bike', 18, 30, 118, '')");
query.exec("INSERT INTO scooter (name, maxspeed, "
"maxrange, weight, description) "
"VALUES ('Leopard Shark', 16, 12, 63, "
"'Battery indicator, removable seat, foldable')");
query.exec("INSERT INTO scooter (name, maxspeed, "
"maxrange, weight, description) "
"VALUES ('Vego iQ 450', 15, 0, 60, "
"'OUT OF STOCK')");
query.exec("INSERT INTO scooter (name, maxspeed, "
"maxrange, weight, description) "
"VALUES ('X-Treme X-11', 15, 11, 38, "
"'High powered brakes, foldable')");
query.exec("INSERT INTO scooter (name, maxspeed, "
"maxrange, weight, description) "
"VALUES ('ZZ Cruiser', 14, 10, 46, "
"'Two batteries, removable seat')");
query.exec("INSERT INTO scooter (name, maxspeed, "
"maxrange, weight, description) "
"VALUES ('X-Treme X-010', 10, 10, 14, "
"'Solid tires')");
query.exec("INSERT INTO scooter (name, maxspeed, "
"maxrange, weight, description) "
"VALUES ('Q Electric Chariot', 10, 15, 60, "
"'Foldable')");
query.exec("INSERT INTO scooter (name, maxspeed, "
"maxrange, weight, description) "
"VALUES ('X-Treme X250', 15, 12, 0, "
"'Solid aluminum deck')");
query.exec("INSERT INTO scooter (name, maxspeed, "
"maxrange, weight, description) "
"VALUES ('Go MotorBoard 2000X', 15, 0, 20, "
"'Foldable and carryable')");
query.exec("INSERT INTO scooter (name, maxspeed, "
"maxrange, weight, description) "
"VALUES ('Goped ESR750 Sport Electric Scooter', "
"20, 6, 45, " "'Foldable and carryable')");
}

int main(int argc, char *argv[])
{
QApplication app(argc, argv);

bool create = !QFile::exists("scooters.dat");
if (!createConnection())
return 1;
if (create)
createFakeData();

ScooterWindow window;
window.resize(600, 500);
window.show();

return app.exec();
}