postgresql - 有没有办法列出所有用户定义的 PostgreSQL 函数？

Question

PostgreSQL 提供命令\dv 来列出所有 View 。是否有类似的方法来列出所有用户定义的函数，或者可能只是列出特定用户定义的那些函数？\sf 要求您知道函数的名称，它将提供函数的定义。\df 列出所有函数(而且有很多)。我想要一种方法来显示我定义的函数列表。

Answer 1

查找此类查询的最佳方法是使用带有--echo-hidden 选项的psql。然后运行 ​​psql 元命令，您将看到使用的查询。

\df 是:

SELECT n.nspname as "Schema",
  p.proname as "Name",
  pg_catalog.pg_get_function_result(p.oid) as "Result data type",
  pg_catalog.pg_get_function_arguments(p.oid) as "Argument data types",
 CASE
  WHEN p.proisagg THEN 'agg'
  WHEN p.proiswindow THEN 'window'
  WHEN p.prorettype = 'pg_catalog.trigger'::pg_catalog.regtype THEN 'trigger'
  ELSE 'normal'
 END as "Type"
FROM pg_catalog.pg_proc p
     LEFT JOIN pg_catalog.pg_namespace n ON n.oid = p.pronamespace
WHERE pg_catalog.pg_function_is_visible(p.oid)
      AND n.nspname <> 'pg_catalog'
      AND n.nspname <> 'information_schema'
ORDER BY 1, 2, 4;

您可以通过例如将 where 子句更改为:

AND n.nspname = 'public'

相当于 \df public.*

---

如果你勾选the documentation of pg_proc您会注意到有一个 proowner 列，因此您还可以运行:

SELECT n.nspname as "Schema",
       p.proname as "Name",
       pg_catalog.pg_get_function_result(p.oid) as "Result data type",
       pg_catalog.pg_get_function_arguments(p.oid) as "Argument data types"
FROM pg_catalog.pg_proc p
  JOIN pg_catalog.pg_roles u ON u.oid = p.proowner
  LEFT JOIN pg_catalog.pg_namespace n ON n.oid = p.pronamespace
WHERE pg_catalog.pg_function_is_visible(p.oid)
  AND n.nspname = 'public' 
  AND u.rolname = current_user --<< this limits the functions to those that the current user owns.