From: Jaime Casanova <systemguards@gmail.com>
To: Scott Yohonn <syohonn@gmail.com>
Cc: pgsql-sql@postgresql.org <pgsql-sql@postgresql.org>
Subject: Re: PL/PGSQL - How to pass in variables?
Date: Sun, 14 May 2006 11:16:58 -0500
Message-ID: <c2d9e70e0605140916m466af221v43f51e6c0e2890b8@mail.gmail.com> (raw)
In-Reply-To: <ff1df1410605140828s2ac7c170j9d7c4e5b2b0a1f5c@mail.gmail.com>
References: <ff1df1410605140828s2ac7c170j9d7c4e5b2b0a1f5c@mail.gmail.com>
On 5/14/06, Scott Yohonn <syohonn@gmail.com> wrote:
>
> Using PL/PGSQL, I am trying to create a procedure to display the
> count of rows in any single table of a database. The End-user would
> pass in a table name and the prodecure would display the table name
> with the row count.
> I am able to hardcode the variable for table and get the appropriate
> results from my count function (see below), but cannot pass in a
> variable and have the function work. Any suggesstions???
>
> CREATE FUNCTION get_table_count(tablename text) RETURNS integer AS $$
> DECLARE
>
> --tablename ALIAS FOR $1;
>
> rowcount INTEGER;
> BEGIN
>
> SELECT INTO rowcount count(*) FROM tablename;
>
> RETURN rowcount;
>
> END;
> $$ LANGUAGE 'plpgsql';
>
you can't do this because tablename is a variable not a table, you
have to append the content of the variable in a string that can be
EXECUTE'd
EXECUTE 'SELECT count(*) FROM ' || tablename INTO rowcount;
--
regards,
Jaime Casanova
"Programming today is a race between software engineers striving to
build bigger and better idiot-proof programs and the universe trying
to produce bigger and better idiots.
So far, the universe is winning."
Richard Cook
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To: pgsql-sql@postgresql.org
Cc: systemguards@gmail.com, syohonn@gmail.com
Subject: Re: PL/PGSQL - How to pass in variables?
In-Reply-To: <c2d9e70e0605140916m466af221v43f51e6c0e2890b8@mail.gmail.com>
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