From: Ray Madigan <ray@madigans.org>
To: pgsql-sql@postgresql.org
Subject: Trigger on select :-(
Date: Mon, 1 Mar 2010 18:10:47 -0800
Message-ID: <CMEFJOLLJJDJKKLGEJJMOELBDDAA.ray@madigans.org> (raw)
What I want is to have a trigger on select, but since I have searched the
archives I know that is not possible. I also read that view rules is the
technology is whats available. Having never used views before I can't seem
to get my mind to figure out what I need to do to solve my problem.
I have a table that defines a key that I will use in another table in a list
of items defined in the previous table.
The tables are
CREATE TABLE Foo ( INTEGER key not null primary key,
... characteristics for the Foo item );
CREATE TABLE Catalog ( INTEGER FooKey FOREIGN KEY,
... other catalog data );
The catalog will have rows that reference the elements in the Foo table.
I also have another table that references the Foo table
CREATE TABLE ToDo ( INTEGER FooKey FOREIGN KEY,
... other ToDo information.
What I want to do is when I do a SELECT on the Catalog and deliver the
result to the user, I want to check to see if the FooKey is in the users
ToDo table and set the value of a column isToDo to true or false depending
on if the FooKey exists in the ToDo table for the user. If I were building
a table I would use a trigger and select on the row in the ToDo table.
Please, all I want is an idea where to start, what I should read and I will
figure out how to do it.
Thanks in advance.
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To: pgsql-sql@postgresql.org
Cc: ray@madigans.org
Subject: Re: Trigger on select :-(
In-Reply-To: <CMEFJOLLJJDJKKLGEJJMOELBDDAA.ray@madigans.org>
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