This is from the jdbc list. Is there any way to get fully qualified
column names?
Dave
-----Original Message-----
From: pgsql-jdbc-owner@postgresql.org
[mailto:pgsql-jdbc-owner@postgresql.org] On Behalf Of Ben Carterette
Sent: August 16, 2001 11:02 AM
To: Rene Pijlman
Cc: pgsql-jdbc@postgresql.org
Subject: Re: [JDBC] select on multiple tables
This won't work because I don't know in advance of the SELECT which
tables I'm going to be selecting from. The SELECT is done in a servlet
that determines the tables based on request parameters. I tried "SELECT
table1.*, table2.* FROM table1, table2", but it still can't tell the
difference between columns with the same name.
Thanks for your help
ben
On Wednesday, August 15, 2001, at 06:29 PM, Rene Pijlman wrote:
> On Wed, 15 Aug 2001 16:43:31 -0500, Ben Carterette wrote:
>> I have a query like "SELECT * FROM table1, table2" and I want to read
>> values out of a ResultSet. What if the two tables have column names
>> in common and
>> I can't predict the column numbers? Is there any way to get
table1.id
>> and
>> table2.id? rs.getString tells me "The column name table1.id not
>> found."
>
> Does this also happen when you explicitly name the columns?
>
> SELECT table1.id, ..., table2.id, ...
> FROM table1, table2
>
> Or if that doesn't help, try if a column label with the AS clause
> works:
>
> SELECT [ ALL | DISTINCT [ ON ( expression [, ...] ) ] ]
> * | expression [ AS output_name ] [, ...]
> http://www.postgresql.org/idocs/index.php?sql-select.html
>
> SELECT table.id AS id1, ..., table2.id AS id2
> FROM table1, table2
>
> And then rs.getString("id1");
>
> I think both solutions should work. Please let us know if they don't.
>
> Regards,
> René Pijlman
>
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