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Restricting access to rows?

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We have a growing ASP-hosted application built on PHP/Postgres 8.1, and are 
getting requests from clients to manipulate the databases more directly. 
However, the structure of our databases prevents this from happening readily.

Assume I have two tables configured thusly: 

create table customers (
	id serial unique not null, 
	name varchar not null
	); 

create table widgets ( 
	customers_id integer not null references customers(id), 
	name varchar not null, 
	value real not null default 0
	);

insert into customers (name) values ('Bob'); 
insert into customers (name) values ('Jane'); 
insert into widgets (customers_id, name, value) VALUES (1, 'Foo', 100); 
insert into widgets (customers_id, name, value) VALUES (1, 'Bar', 50); 
insert into widgets (customers_id, name, value) VALUES (2, 'Bleeb', 500); 

This leaves us with two customers, Bob who has two widgets worth $150, and 
Jane with one widget worth $500. 

How can I set up a user so that Bob can update his records, without letting 
Bob update Jane's records? Is it possible, say with a view or some other 
intermediate data type? 

Thanks, 

-Ben 
-- 
"The best way to predict the future is to invent it."
- XEROX PARC slogan, circa 1978


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