Hey, 2011/2/8 RW Shore <rws...@gmail.com>
> I'm using the following type definition: > create type typedef.BASIC_PEDIGREE as ( > DATE_ADDED TIMESTAMP, > DESCRIPTION VARCHAR(128) [10] > )\c > > I understand that PostgreSQL doesn't enforce the array length [10]. > However, I'd like to write an application that can retrieve this length AND > the size of the varchar that makes up the array. I can't find these values > anyplace in the various system catalogs or views. Does PostgreSQL keep this > information someplace and if so where? If there's no way to retrieve (say) > the max size of the varchar, does this mean that PostgreSQL does not enforce > the max size of this field as well as not enforcing the array bounds? > I am not sure that Postgres keeps array size limits since, according to http://www.postgresql.org/docs/9.0/static/arrays.html#ARRAYS-DECLARATION "... current implementation ignores any supplied array size limits ..." But it is possible to get maximum length of varchar: SELECT atttypmod - 4 FROM pg_attribute WHERE attrelid = 'typedef.BASIC_PEDIGREE'::regclass AND attname = 'DESCRIPTION'; Please note that 4 is an integer which represents length. -- // Dmitriy.
