Question

我正在寻找一种方法来列出OpenSuse postgresql服务器上的所有数据库和所有模式。我知道我可以使用\l+等元命令列出所有数据库，但有没有办法列出所有数据库的所有信息，包括数据库，架构和大小信息？

我想要一种整体看待一切的方法。

谢谢！

Answer 1

从PostgreSQL 9.4.1开始，以下查询将在\l+中提供与psql相同的输出：

SELECT
  d.datname as "Name",
  pg_catalog.pg_get_userbyid(d.datdba) as "Owner",
  pg_catalog.pg_encoding_to_char(d.encoding) as "Encoding",
  d.datcollate as "Collate",
  d.datctype as "Ctype",
  pg_catalog.array_to_string(d.datacl, E'\n') as "Access privileges",
  CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')
    THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))
    ELSE 'No Access'
  END as "Size",
  t.spcname as "Tablespace",
  pg_catalog.shobj_description(d.oid, 'pg_database') as "Description"
FROM
  pg_catalog.pg_database d
JOIN
  pg_catalog.pg_tablespace t on d.dattablespace = t.oid
ORDER BY 1;

以下是来源：src/bin/psql/describe.c

Answer 2

我没有看到获取数据库模式列表而无需先连接它的方法。基于this，我认为您可以使用db_link来获取它，例如：

CREATE OR replace FUNCTION databases_schemas_size 
  () returns setof RECORD 
AS 
  $body$ 

  DECLARE 

    connection_info CHARACTER varying; 
    i RECORD; 
    r RECORD; 

  BEGIN 

    FOR r IN SELECT cast(datname AS CHARACTER varying) FROM  pg_database  WHERE  datistemplate = FALSE LOOP 

    SELECT format ('dbname=%s user=%s password=%s', r.datname, 'YOUR_ALLOWED_USERNAME', 'PASSWORD') INTO   connection_info; 

    perform dblink_connect(connection_info); 
    FOR i IN SELECT r.datname, * 
    FROM   dblink('SELECT nspname , pg_size_pretty(sum(pg_relation_size(C.oid))) AS size FROM pg_class C LEFT JOIN pg_namespace N ON (N.oid = C.relnamespace) WHERE nspname NOT IN (''pg_catalog'', ''information_schema'') group by nspname') 
    AS t(schema_name CHARACTER varying, schema_size text) 

    LOOP 
    RETURN NEXT i; 
    END LOOP; 

  perform dblink_disconnect(); 
END LOOP; 

RETURN; 

END; 
$body$ LANGUAGE plpgsql volatile cost 100; 


SELECT * FROM  databases_schemas_size() 
AS (datname CHARACTER varying, schema_name CHARACTER varying, schema_size text);

您可以使用FOREIGN DATA WRAPPER functionality

对其进行改进，以便不对登录名/密码进行硬编码

如何在postgresql中列出所有数据库及其模式？

2 个答案: