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self defined data type "with limit"?

From: Michael Enke <michael(dot)enke(at)wincor-nixdorf(dot)com>
To: pgsql-hackers(at)postgresql(dot)org
Subject: self defined data type "with limit"?
Date: 2007-06-27 12:08:43
Message-ID: 4682534B.3060202@wincor-nixdorf.com (view raw or flat)
Thread:
Lists: pgsql-hackers
Hello everyone,
I have created a new data type "mychar". How can I specify a limit for it?

This (unlimited version) works fine:
create table table_a(col_a mychar);

This gives an error:
create table table_a(col_a mychar(10));
ERROR:  syntax error at or near "(" bei Zeichen 34
ZEILE 1: create table table_a(col_a mychar(10));

Background: I need a varchar(10) but with quasi numeric sort order
so that "2" appears before "10".
Therefore I thought I create a new type and a new operator class.
Any better way to perform this?

Regards,
Michael


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