Question

I created a function using postgresql. But this function returns error when i try to execute it.
error "ERROR: syntax error at or near "||"

CREATE OR REPLACE FUNCTION search_address_book(address_ids character)
  RETURNS void AS
$BODY$ 
SET sqlStatement = 'select * from addressbook';
SET address_ids = 'Post' || 'greSQL';
$BODY$
LANGUAGE 'sql' STABLE
COST 100;

My Server version is 8.3.14. Is this wrong? how do i concat two strings in postgresql?

Answer 1

To use variables you need a plpgsql function:

CREATE OR REPLACE FUNCTION search_address_book(address_ids character)
  RETURNS void AS
$BODY$
declare
   sqlStatement text;
   address_ids text;
begin
   sqlStatement := 'select * from addressbook';
   address_ids := 'Post' || 'greSQL';
end
$BODY$
LANGUAGE plpgsql STABLE;