PostgreSQL 提供命令 \dv 来列出所有视图。是否有类似的方法来列出所有用户定义的函数或仅列出特定用户定义的函数? \sf 要求您知道函数的名称,它将提供函数的定义。 \df 列出了所有函数(而且有很多)。我想要一种方法来显示我定义的函数列表。
查找此类查询的最佳方法是使用psql
与--echo-hidden
选项。然后运行psql
元命令,您将看到所使用的查询。
For \df
这是:
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;
您可以通过例如调整将 where 子句更改为:
AND n.nspname = 'public'
这相当于\df public.*
如果你检查的文档pg_proc https://www.postgresql.org/docs/current/static/catalog-pg-proc.html你会注意到有一个proowner
列,这样你也可以运行:
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.
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