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List:       kde-pim
Subject:    Re: [Kde-pim] Akonadi fetch/list/query/monitor API
From:       Mark Bucciarelli <mark () easymailings ! com>
Date:       2006-04-04 1:11:07
Message-ID: 20060404011107.GP3984 () rabbit
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On Mon, Apr 03, 2006 at 11:08:04AM +0200, Volker Krause wrote:
> Hi,
> 
> we currently have a mix of various diffrent ways to access data on the storage 
> backend:
> 
> uid -> object
> uid-list -> object-list
> query -> uid-list
> nothing -> uid-hash of everything
> nothing -> monitor everything
> 
> My not yet committed message stuff also contains:
> 
> query -> object-list
> query -> monitor everything which matches the query
> 
> We should unify this ;-)
> 
> I think we only need the last two ways (query -> object-list, query -> 
> monitor). Except query -> uidlist, all the others are just special cases of 
> the query based ways.
> For query->uid-list I currently don't see a real usecase, there isn't much you 
> can do just with the uids and doing eg. a listing of a large mail folder by 
> query -> uid-list, uid-list -> object-list doesn't look like a good idea to 
> me.
> 
> What do you think?

Qt's interfaces are great--I would mimic QSqlDatabase.

After you remove the following stuff from QSqlDatabase: 

    - transactions,

    - indexes,

    - connect options,

    - drivers,

    - network info,

    - user info, and

    - isOpen, isValid semantics

here's what's left:

    QSqlDatabase();
    QSqlDatabase( const QSqlDatabase &other );
    ~QSqlDatabase();
    QSqlDatabase & operator= ( const QSqlDatabase &other );

    QSqlQuery exec( const QString &query = QString() ) const;
    QSqlError lastError() const;
    QSqlRecord record( const QString &tablename ) const;

None of the static members looked applicable.

What about writing it as a QSQlDriver? That would make it extremely easy
for any KDE or plain Qt program to use it. Plus, once it works I would
not be surprised if people want to add some of the functionality that is
crossed off now. In addition, at the client level, you are really close
to getting a Sql backend for free.

m
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