From: pgsql-sql-ow...@postgresql.org [mailto:pgsql-sql-ow...@postgresql.org] On Behalf Of Russell Keane Sent: Tuesday, November 08, 2011 4:34 PM To: pgsql-sql@postgresql.org Subject: [SQL] Updatable view should truncate table fields
Using PostgreSQL 9.0. We have a table which is not accessible by client code. We also have views with rules and triggers to intercept any insert or update statements and write that data in a slightly different format back to the table. A particular field in the table is currently 5 chars but recently we have had update / insert statements containing more than 5. This obviously (and correctly) throws an error. We can extend the table to accept more than 5 characters but the view must return 5 characters. If we try to extend the table to accept, say, 10 characters the view will display 10. If I also cast the view field to 5 characters then any insert with more than 5 characters still fails. ----------------------------------------------------- Haven't used updatable VIEWs yet but couldn't you either define the VIEW as: CREATE VIEW .... AS ( SELECT field1, field2::varchar(5) AS field2 FROM table ); Or, alternatively, define the INSERT/UPDATE functions to perform the truncation upon inserting into the table? Does the INSERT itself throw the error or is one of your functions raising the error when it goes to insert the supplied value into the table? It is generally bad form to modify user data for storage so either you truly have a length limitation that you need to restrict upon data entry (in which case everything is working as expected) or you should allow any length of data to be input and, in cases where the output medium has length restrictions, you can ad-hoc limit the display length of whatever data was provided. David J. -- Sent via pgsql-sql mailing list (pgsql-sql@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-sql