Re: ANY subquery and PreparedStatements

  yes... I understood your idea... my problem is that I don't know the
maximum number of parameters I'll have

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