如何使用PostgreSQL从表名中获取列属性查询？

我有一个项目,我需要一个查询来获取列的所有属性(列名,位置,数据类型,不空和注释)所有这些使用表名.

我获得了列名,位置数据类型和非空？用这个查询：

SELECT column_name,data_type,ordinal_position,is_nullable 
FROM information_schema."columns"
WHERE "table_name"='TABLE-NAME'

但是,我需要评论！

这是针对 system catalog的查询,应该会获取所需的一切(免费提供奖金主键字段).

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;

这会返回以下结果：

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：列号> name：列名> typ：数据类型> notnull：列定义为NOT NULL> comment：为列定义的任何COMMENT> primary_key：列定义为PRIMARY KEY> default：用于默认值的命令

原文地址：https://www.jb51.cc/postgresql/192621.html