Re: ANY subquery and PreparedStatements - Mailing list pgsql-jdbc

You're right... but it's actually based on user interaction (i.e.:
selecting items using checkboxes)
  I guess I'll just have to issue a query per item... ugly :-(
  But much thanks for your help :-)

On Wed, 2003-02-19 at 14:42, Jason S. Friedman wrote:
> If the "virtually unlimited number of parameters" is itself being generated by a query, perhaps you could use an
EXISTSclause: 
>
> select * from <table> where EXISTS (
>     SELECT 1
>     FROM <othertables>, <table>
>     WHERE <table.field> ...
> )
>
> On Wed, Feb 19, 2003 at 01:57:03PM -0300, Felipe Schnack wrote:
> >   This is actually a very good solution to the problem... I'm sorry that
> > in my case I have a virtually unlimited number of parameters :-(
> >
> > On Wed, 2003-02-19 at 13:54, Csaba Nagy wrote:
> > > Hi Felipe,
> > >
> > > What we are doing in our code is to prepare a statement with a lot of
> > > parameter placeholders, something like:
> > >
> > > select * from <table> where <field> in (?,?,?,?,?,?,?,?,?,?,?,?,?,?,?);
> > >
> > > and then set some of the parameters with the available values, and set
> > > the rest to nulls. The nulls should be disregarded by the backend
> > > anyway... this works well with Oracle, I'm not sure how efficient is
> > > with Postgres.
> > > The only reason to use this is to have a prepared statement instead of
> > > building dynamic queries all the time. You only must make sure the nr.
> > > of ? signs is at least as much as many parameters you can have at
> > > maximum.
> > >
> > > HTH,
> > > Csaba.
> > >
> > > On Wed, 2003-02-19 at 13:24, Felipe Schnack wrote:
> > > >   I'm afraid it kind of impossible to use PreparedStatements with the
> > > > "ANY" subquery keyword... For example, if I take this query and prepare
> > > > it:
> > > >   "select * from <table> where <field> any (?)"
> > > >   How can I set my parameter as a list of values, so my query searches
> > > > for for different values of the specified field?
> > > >
> > > > --
> > > >
> > > > Felipe Schnack
> > > > Analista de Sistemas
> > > > felipes@ritterdosreis.br
> > > > Cel.: (51)91287530
> > > > Linux Counter #281893
> > > >
> > > > Centro Universitário Ritter dos Reis
> > > > http://www.ritterdosreis.br
> > > > ritter@ritterdosreis.br
> > > > Fone/Fax.: (51)32303341
> > > >
> > > >
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> > >
> > --
> >
> > Felipe Schnack
> > Analista de Sistemas
> > felipes@ritterdosreis.br
> > Cel.: (51)91287530
> > Linux Counter #281893
> >
> > Centro Universitário Ritter dos Reis
> > http://www.ritterdosreis.br
> > ritter@ritterdosreis.br
> > Fone/Fax.: (51)32303341
> >
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> --
>
> Regards,
>
> Jason S. Friedman
> mailto:jason@powerpull.net
> http://www.powerpull.net
>
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--

Felipe Schnack
Analista de Sistemas
felipes@ritterdosreis.br
Cel.: (51)91287530
Linux Counter #281893

Centro Universitário Ritter dos Reis
http://www.ritterdosreis.br
ritter@ritterdosreis.br
Fone/Fax.: (51)32303341