From: | "Oliver Elphick" <olly(at)lfix(dot)co(dot)uk> |
---|---|
To: | pgsql-hackers(at)postgresql(dot)org |
Subject: | Is this a bug in the table definition or in PostgreSQL? |
Date: | 2000-05-04 16:44:28 |
Message-ID: | 200005041644.e44GiUv05604@linda.lfix.co.uk |
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Thread: | |
Lists: | pgsql-hackers |
The complicated constraint in this definition of the product table doesn't
work, but should it? or is there a better way to do this?
CREATE FUNCTION ean_checkdigit(bpchar, bpchar) RETURNS BOOLEAN
AS '/usr1/proj/bray/sql/funcs.so' LANGUAGE 'C';
CREATE TABLE brandname
(
id CHAR(12) PRIMARY KEY,
ean_prefix CHAR(8) CHECK (ean_prefix ~ '50-[0-9]{5}')
REFERENCES company(ean_prefix)
ON UPDATE CASCADE
ON DELETE NO ACTION,
name TEXT NOT NULL
)
;
CREATE TABLE product
(
id CHAR(10) PRIMARY KEY,
brand CHAR(12) REFERENCES brandname(id)
ON UPDATE CASCADE
ON DELETE NO ACTION,
eancode CHAR(6) CHECK (eancode IS NULL
OR eancode ~ '[0-9]{6}'),
...
CONSTRAINT ean CHECK (
CASE WHEN eancode IS NULL OR brand IS NULL
THEN 't'
ELSE ean_checkdigit(
(SELECT ean_prefix
FROM brandname
WHERE brandname.id = brand
), eancode)
END
)
)
;
copy product from '/rover/avoca/dumps/dbdump.product'
ERROR: copy: line 2, ExecEvalExpr: unknown expression type 108
[line 1 had null values in the relevant fields]
--
Oliver Elphick Oliver(dot)Elphick(at)lfix(dot)co(dot)uk
Isle of Wight http://www.lfix.co.uk/oliver
PGP key from public servers; key ID 32B8FAA1
========================================
"Live in harmony with one another. Do not be proud, but
be willing to associate with people of low position.
Do not be conceited." Romans 12:16
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