इस translate()
. के दूसरे पैरामीटर में वांछित वर्ण डालें कॉल करें:
CREATE TABLE lawyer (
id SERIAL PRIMARY KEY,
name VARCHAR NOT NULL,
url_name VARCHAR check(translate(url_name, 'abcdefghijklmnopqrstuvwxyz', '') = '') NOT NULL,
gender VARCHAR(1) check (gender in ('m','f')) NOT NULL
);
insert into lawyer
values (default, 'Adam Smith', 'domain', 'f');
INSERT 0 1
insert into lawyer
values (default, 'Adam Smith', 'dömain', 'f');
ERROR: new row for relation "lawyer" violates check constraint "lawyer_url_name_check"
DETAIL: Failing row contains (3, Adam Smith, dömain, f).
वैकल्पिक रूप से आप एक ट्रिगर बना सकते हैं, जो फ्लाई पर मान को संशोधित करता है:
create or replace function lawyer_before_insert_or_update()
returns trigger language plpgsql as $$
begin
new.url_name := lower(new.url_name);
if translate(new.url_name, 'abcdefghijklmnopqrstuvwxyz', '') <> '' then
raise exception 'Incorrect url name.';
end if;
return new;
end $$;
create trigger lawyer_before_insert_or_update
before insert or update on lawyer
for each row execute procedure lawyer_before_insert_or_update();
insert into lawyer
values (default, 'Adam Smith', 'DOMAIN', 'f')
returning *;
id | name | url_name | gender
----+------------+----------+--------
4 | Adam Smith | domain | f
(1 row)
INSERT 0 1
insert into lawyer
values (default, 'Adam Smith', 'dömain', 'f');
ERROR: Incorrect url name.