Hello 2012/1/18 Rehan Saleem <pk_re...@yahoo.com>
> hi > i want to create a function in postgresql that take input for columns from > user for example first_name , last_name, addres. and will put them into > table , and i also want to use exception if user enters wrong data. will > some one help me how can i create thats function , because i am new to > postgresql . i know how to do it in MS-SQL , i also have that code .if you > dont understand what am trying to say . i can post<http://www.dbforums.com/#> > sql > code .thanks > > CREATE TABLE users(id serial PRIMARY KEY, first_name varchar(10), last_name varchar(10)); CREATE OR REPLACE FUNCTION new_user(fname varchar, lname varchar) RETURNS int AS $$ DECLARE r int; BEGIN -- custom exception -- lname cannot be empty or NEMO IF trim(lname) = '' OR lower(lname) = 'nemo' THEN RAISE EXCEPTION 'bad last_name: "%"', lname; END IF; INSERT INTO users(first_name, last_name) VALUES(lname, fname) RETURNING id INTO r; RETURN r; END; $$ LANGUAGE plpgsql; postgres=# select new_user('pavel','stehule'); new_user ---------- 1 (1 row) postgres=# select new_user('pavel','very long text'); ERROR: value too long for type character varying(10) CONTEXT: SQL statement "INSERT INTO users(first_name, last_name) VALUES(lname, fname) RETURNING id" PL/pgSQL function "new_user" line 8 at SQL statement postgres=# select new_user('pavel','nemo'); ERROR: bad last_name: "nemo" postgres=# Regards Pavel Stehule
