Her er en forespørgsel mod systemkataloget, der skal hente alt, hvad du har brug for (med et bonus primærnøglefelt gratis).
SELECT DISTINCT
a.attnum as num,
a.attname as name,
format_type(a.atttypid, a.atttypmod) as typ,
a.attnotnull as notnull,
com.description as comment,
coalesce(i.indisprimary,false) as primary_key,
def.adsrc as default
FROM pg_attribute a
JOIN pg_class pgc ON pgc.oid = a.attrelid
LEFT JOIN pg_index i ON
(pgc.oid = i.indrelid AND i.indkey[0] = a.attnum)
LEFT JOIN pg_description com on
(pgc.oid = com.objoid AND a.attnum = com.objsubid)
LEFT JOIN pg_attrdef def ON
(a.attrelid = def.adrelid AND a.attnum = def.adnum)
WHERE a.attnum > 0 AND pgc.oid = a.attrelid
AND pg_table_is_visible(pgc.oid)
AND NOT a.attisdropped
AND pgc.relname = 'TABLE_NAME' -- Your table name here
ORDER BY a.attnum;
Hvilket ville returnere resultater som:
num | name | typ | notnull | comment | primary_key
-----+-------------+-----------------------------+---------+---------------------+-------------
1 | id | integer | t | a primary key thing | t
2 | ref | text | f | | f
3 | created | timestamp without time zone | t | | f
4 | modified | timestamp without time zone | t | | f
5 | name | text | t | | f
- num:Kolonnenummeret
- navn:Kolonnenavnet
- typ:datatypen
- notnull:Er kolonnen defineret som
NOT NULL - kommentar:Enhver
COMMENTdefineret for kolonnen - primær_nøgle:Er kolonnen defineret som
PRIMARY KEY - standard:Kommandoen, der bruges til standardværdien