[GENERAL] Constaints

[Jake Stride]

Is there anyway to declare a constant that you can then use within a 
postgresql 'session', i am connecting from a PHP based application and 
trying to integrate another.

What I want to be able to do is setup a rule on another table so that 
whenever a query is run on the table it appends another value to the query.

i.e i want to be able to do:
'SET someconstant an_id=1;'
Then with a rule, running:
SELECT * FROM a_table
would become:
SELECT * FROM a_table WHERE id=a_id
is this possible?
Thanks
Jake
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