How to Store and Retrieve Image on SQLite

English Español Български

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 :

<br /> QFile file&amp;amp;#40;fileName&amp;amp;#41;;<br /> if (!file.open(QIODevice::ReadOnly)) return;<br /> QByteArray byteArray = file.readAll();

QSqlQuery query;<br /> query.prepare(&quot;INSERT INTO imgtable (imgdata) VALUES (?)&quot;);<br /> query.addBindValue(byteArray);<br /> query.exec&amp;amp;#40;&amp;#41;;<br />

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

<br /> QSqlQuery query(&quot;SELECT imgdata FROM imgtable&amp;quot;);<br /> query.next();<br /> QByteArray array = query.value(0).toByteArray();<br />

Creating a QPixmap from QByteArray :

<br /> QPixmap pixmap = QPixmap();<br /> pixmap.loadFromData(array);<br />

It is done. Now the pixmap can be used in a Button as icon or in label etc.