Hey,
Sunil dont you think it will be better if you get this SQL issue to forum
dedicated to it.. MAy be you will get better soln there ..
Divakar
-----Original Message-----
From: sunil_s23 [mailto:[EMAIL PROTECTED]]
Sent: Monday, June 18, 2001 11:20 AM
To: [EMAIL PROTECTED]
Subject: Re: Checking for Empty Result Set
If we consider a large application; this involves
doubling the number of SQL queries; one extra query
for each query just to find out the count; I feel that
we should be considering the overheads in accessing a
database and executing a query and that too if it is
over a network with heavy traffic.....
--- King Maurice <[EMAIL PROTECTED]> wrote:
> Economical way, your right its kinda tedious, but it
> only about 4 simple
> lines of code, how economical can you get, just pure
> laziness maybe, but
> that is up to your discretion, as long as you get
> the job done.
>
>
>
> ----- Original Message -----
> From: "sunil_s23" <[EMAIL PROTECTED]>
> To: <[EMAIL PROTECTED]>
> Sent: Monday, June 18, 2001 12:07 PM
> Subject: Re: Checking for Empty Result Set
>
>
> > That calls for two sql statements; is there a more
> > economical way out ?.
> > The following code seems to work, but not always.
> > Any pointers ?
> >
> > ResultSet rs = ps.executeQuery();
> > if(rs.isBeforeFirst() == false)
> > {
> > System.out.println("empty result set");
> > }
> > else
> > {
> > while(rs.next())
> > {
> >
> > System.out.println(rs.getString("EMPLOYEE_NAME"));
> > }
> > }
> >
> > --- King Maurice <[EMAIL PROTECTED]> wrote:
> > > Well the get the count of the resultset in your
> sql
> > > command and then test
> > > for a condition of one
> > >
> > > You need to figure out on your own, the
> conditions
> > > in your code, if not your
> > > lost!!!!
> > >
> > > Maurice~
> > >
> > > ----- Original Message -----
> > > From: "sunil_s23" <[EMAIL PROTECTED]>
> > > To: <[EMAIL PROTECTED]>
> > > Sent: Monday, June 18, 2001 11:58 AM
> > > Subject: Re: Checking for Empty Result Set
> > >
> > >
> > > > This definitely caters to the case when there
> is
> > > only
> > > > one row in the result set; but what about the
> case
> > > if
> > > > the result set contains more than one row. I
> am
> > > > looking for a solution which will handle both
> > > single
> > > > row results and multiple row results as well
> as
> > > the
> > > > case when the result set is empty.
> > > > Any suggestions ?,
> > > > Thanks,
> > > > Sunil.
> > > >
> > > > --- King Maurice <[EMAIL PROTECTED]>
> wrote:
> > > > > I see your problem
> > > > >
> > > > > Do this example or follow this example if
> you
> > > can
> > > > > comprehend.
> > > > >
> > > > > Example below::
> > > > >
> > > > > if (! rs.next())
> > > > > {
> > > > > %>
> > > > > <table><tr><td>empty result
> > > set</td></tr></table>
> > > > > <%
> > > > > }
> > > > > else
> > > > > {
> > > > > String employee =
> > > rs.getString("EMPLOYEE_NAME"));
> > > > > %>
> > > > > <table><tr><td><%= employee
> > > %></td></tr></table>
> > > > > <%
> > > > > }
> > > > >
> > > > >
> > > > >
> > > > >
> > > > > ----- Original Message -----
> > > > > From: "sunil_s23" <[EMAIL PROTECTED]>
> > > > > To: <[EMAIL PROTECTED]>
> > > > > Sent: Monday, June 18, 2001 11:44 AM
> > > > > Subject: Re: Checking for Empty Result Set
> > > > >
> > > > >
> > > > > > See the code below, it does not work if
> there
> > > is a
> > > > > > single row in the result set; in other
> words
> > > the
> > > > > > statement if(!rs.next()) causes a row of
> > > result
> > > > > set to
> > > > > > be skipped.
> > > > > > Any suggestions ?,
> > > > > > Sunil.
> > > > > >
> > > > > > ResultSet rs = ps.executeQuery();
> > > > > > if(!rs.next())
> > > > > > System.out.println("empty
> result
> > > > > set");
> > > > > > while(rs.next())
> > > > > > {
> > > > > >
> System.out.println(rs.getString
> > > > > > ("EMPLOYEE_NAME"));
> > > > > > }
> > > > > >
> > > > > > --- Satyanarayan Divakar
> > > > > > <[EMAIL PROTECTED]> wrote:
> > > > > > > if(!resultSet.next())
> > > > > > > display"No Records Retreived";
> > > > > > >
> > > > > > > -----Original Message-----
> > > > > > > From: sunil_s23
> [mailto:[EMAIL PROTECTED]]
> > > > > > > Sent: Monday, June 18, 2001 10:27 AM
> > > > > > > To: [EMAIL PROTECTED]
> > > > > > > Subject: Re: Checking for Empty Result
> Set
> > > > > > >
> > > > > > >
> > > > > > > Hi All,
> > > > > > > A ResultSet is never null once we
> execute a
> > > > > > > PreparedStatement and assign the result
> to
> > > the
> > > > > > > Result
> > > > > > > Set.
> > > > > > > Is there any other way of checking
> whether a
> > > > > > > ResultSet
> > > > > > > is empty ?
> > > > > > > Thanks,
> > > > > > > Sunil.
> > > > > > > --- King Maurice
> <[EMAIL PROTECTED]>
> > > > > wrote:
> > > > > > > > IF RESULTSET IS EQUAL TO NULL
> > > > > > > > DO SOMETHING,
> > > > > > > > SUGGESTION:: NO RECORDS FOUND PLEASE
> TRY
> > > AGAIN
> > > > > > > >
> > > > > > > >
> > > > > > > > ----- Original Message -----
> > > > > > > > From: "sunil_s23"
> <[EMAIL PROTECTED]>
> > > > > > > > To: <[EMAIL PROTECTED]>
> > > > > > > > Sent: Monday, June 18, 2001 11:00 AM
> > > > > > > > Subject: Checking for Empty Result Set
> > > > > > > >
> > > > > > > >
> > > > > > > > > Hello,
> > > > > > > > > Which is the best method for
> checking
> > > > > whether a
> > > > > > > > Result
> > > > > > > > > Set is empty ?
> > > > > > > > >
> > > > > > > > > ResultSet rs =
> prestmt.exeucteUpdate();
> > > > > > > > > Checking for rs.isBeforeFirst()
> > > returning
> > > > > false
> > > > > > > > does
> > > > > > > > > not seem to work always....
> > > > > > > > > Thanks in advance,
> > > > > > > > > Sunil.
> > > > > > > > >
> > > > > > > > >
> > > > > > > > >
>
=== message truncated ===
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