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 [EMAIL PROTECTED]:
> Selon [EMAIL PROTECTED]:
>
> > 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 [EMAIL PROTECTED]:
> > >
> > >> 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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