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From po...@free.fr
Subject Re: DbUtils Best Practices
Date Thu, 13 Sep 2007 10:02:03 GMT
sorry, another point...
queryRunner parameter must be a QueryManager member parameter, you have to
remove "static"

Selon pouky@free.fr:

> i'm seeing another point. Your QueryManager does not offer the guarantee to
> be a
> singleton, you have to declare a private constructor.
>
> Jérome.
>
>
> Selon pouky@free.fr:
>
> > Selon diego.galdi@nurun.it:
> >
> > > Hi,
> > > I'm using a dao pattern, the call
> > >
> > > QueryManager.getInstance().getQueryRunner().query(...);
> > >
> > > is executed in my dao object.
> > >
> > > Servlet calls dao method.
> > >
> > ok.
> >
> > > What do you mean with it depends of your project size?
> > Hi,
> > If you have a small project it is not mandatory to spend a lot of time in
> the
> > abstraction layers, but this is advised. If you implement this approach,
> life
> > is
> > wonderful. :)
> >
> > Jérome.
> >
> > >
> > > Thanks a lot
> > >
> > > Diego
> > >
> > >
> > > > Hi,
> > > > It seems correct, why not, QueryRunner object is thread safe.
> > > > Web layer which calls integration layer directly, it's a bad design but
> > > > this
> > > > depends of your project size.
> > > >
> > > > Jérome.
> > > >
> > > >
> > > >
> > > > Selon diego.galdi@nurun.it:
> > > >
> > > >> Hi, I'm developing a web application using DbUtils classes to execute
> > > >> queries and so on.
> > > >>
> > > >> I user QueryRunner class with a DataSource.
> > > >>
> > > >> I red this class is thread safe, so I implemented a Singleton to
> > > >> instance
> > > >> QueryRunner only once.
> > > >>
> > > >> This is my code:
> > > >>
> > > >> public class QueryManager {
> > > >>
> > > >>  private static QueryManager queryManager = null;
> > > >>
> > > >>  private static QueryRunner queryRunner = null;
> > > >>
> > > >>  static {
> > > >>    try {
> > > >> 	queryRunner = new QueryRunner(DataSourceSingleton.getInstance()
> > > >> 					.getDataSource());
> > > >> 	} catch (Exception e) {
> > > >> 	}
> > > >>  }
> > > >>
> > > >>  public static QueryManager getInstance() {
> > > >>     if (queryManager == null) {
> > > >> 	queryManager = new QueryManager();
> > > >>     }
> > > >>     return queryManager;
> > > >>  }
> > > >>
> > > >>  public QueryRunner getQueryRunner() {
> > > >>    return queryRunner;
> > > >>  }
> > > >>
> > > >> In my servlets I use:
> > > >>
> > > >> QueryManager.getInstance().getQueryRunner().query(...);
> > > >>
> > > >> Is this correct?
> > > >>
> > > >> Which is the best practice to use QueryRunner in a web context?
> > > >>
> > > >> Thanks a lot in advance
> > > >>
> > > >>
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> > > >>
> > > >>
> > > >
> > > >
> > > >
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> >
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> >
>
>
>
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