Andreas 'ads' Scherbaum <adsm...@wars-nicht.de> writes: > So this function is useless. If the syntax is valid, the check is > already done and is_valid() returns true. If the syntax is invalid, PG > will raise an error even before this function returns. The invalid > marker is not checked at all.
This seems pretty clearly explained in the documentation. When you insert invalid numbers in a table using the weak mode, the number will be inserted with the corrected check digit, but it will be displayed with an exclamation mark (!) at the end, for example 0-11-000322-5!. This invalid marker can be checked with the is_valid function and cleared with the make_valid function. You can also force the insertion of invalid numbers even when not in the weak mode, by appending the ! character at the end of the number. > This leads back to my initial question: intended behaviour or just a > bug? And how can one validate an ISBN without raising an error? -- Gregory Stark EnterpriseDB http://www.enterprisedb.com Ask me about EnterpriseDB's 24x7 Postgres support! -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
