如何在SQLite数据库中保存image数据，sqliteimage

How to Store and Retrieve an Image or File with SQLite

Images or any files can be stored in a database. Here is one way to do it using the following steps:

1. Read the system file into a QByteArray.
2. Store QByteArray as a Binary Large Object in database.

For example :

    QFile file(fileName);
    if (!file.open(QIODevice::ReadOnly)) return;
    QByteArray byteArray = file.readAll();
 
    QSqlQuery query;
    query.prepare("INSERT INTO imgtable (imgdata) VALUES (?)");
    query.addBindValue(byteArray);
    query.exec();

Now, the image/file can be retrieved like any other data

    QSqlQuery query("SELECT imgdata FROM imgtable");
    query.next();
    QByteArray array = query.value(0).toByteArray();

Creating a QPixmap from QByteArray :

    QPixmap pixmap = QPixmap();
    pixmap.loadFromData(array);

搬运工http://qt-project.org/wiki/How_to_Store_and_Retrieve_Image_on_SQLite