Postgres User wrote on 08.06.2009 23:03:
Hi,
I'm writing a small ORM tool and have written a number of queries to
retrieve table metadata. One piece of data that I'm having trouble
hunting down is the size of a CHAR field. For example, one table has
a 'user_id' column of type CHAR(36). But when I look at the
pg_attribute and pg_type tables, I can't seem to find this size value
of 36.
Can anyone share the SQL that returns the size of a CHAR? It is NOT
the 'typlen' column. The answer may be the 'typelem' column, but I
can't find details on how to decode it.
Use the information_schema, that is easier:
SELECT character_maximum_length
FROM information_schema.columns
WHERE table_name = 'your_table'
AND column_name = 'the_char_column';
http://www.postgresql.org/docs/8.3/static/infoschema-columns.html
Thomas
--
Sent via pgsql-general mailing list (pgsql-general@postgresql.org)
To make changes to your subscription:
http://www.postgresql.org/mailpref/pgsql-general
