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Thread: Accessing sql local storage from C++?

  1. #1

    Default Accessing sql local storage from C++?


    I'd like to be able to manipulate SQL databases created with openDatabaseSync in a C++ component.
    The goal is to use a database filled in a C++ component as a model for QML views

    Would passing the db connection created in javascript to a QObject as a property work?

  2. #2
    Join Date
    Feb 2014
    Thanked 1 Time in 1 Post
    Qt products
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    Default Re: Accessing sql local storage from C++?

    There wasn't a great answer and this came up on a lot of searches so I'm responding 3 years after the fact in-case someone else comes looking.

    (I'm using Qt 5.2 with LocalStorage 2.0)

    I just used an external variable to store the root:
    Qt Code:
    1. QtQuick2ApplicationViewer viewer;
    2. viewer.setMainQmlFile(QStringLiteral("qml/LightAssistant/main.qml"));
    3. viewer.showExpanded();
    4. LA::OFFLINE_STORAGE_PATH = viewer.engine()->offlineStoragePath();
    5. return app.exec();
    To copy to clipboard, switch view to plain text mode 

    You can then iterate over the databases in the folder:

    (something like this) --I'm using QString dbPath;

    Qt Code:
    1. for(int i = 0; i < list.size() && !endLoop; i++)
    2. {
    3. QFileInfo file =;
    4. if(file.fileName().endsWith(".ini"))
    5. {
    6. QFile ini(file.absoluteFilePath());
    7. if (! | QIODevice::Text))
    8. continue;
    10. while(!ini.atEnd())
    11. {
    12. QString line = ini.readLine();
    13. if(line.contains("myDbName")) //probably could be better
    14. {
    15. dbPath= file.absoluteFilePath().replace(".ini", ".sqlite");
    16. endLoop = true;
    17. }
    18. }
    20. ini.close();
    21. }
    23. }
    To copy to clipboard, switch view to plain text mode 

    Look for the "name=databaseName" in each ini and then you can pass it to the local SQLITE connection which is as simple as:

    Qt Code:
    1. QSqlDatabase db = QSqlDatabase::addDatabase("QSQLITE");
    2. db.setDatabaseName(dbPath);
    To copy to clipboard, switch view to plain text mode 

  3. The following user says thank you to danielbchapman for this useful post:

    anda_skoa (28th February 2014)

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