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PostgreSQL查看系统视图的源码
[pg13@mambapg ~]$ psql -E
psql (13.2)
Type "help" for help.
postgres=# \l
********* QUERY **********
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"
FROM pg_catalog.pg_database d
ORDER BY 1;
**************************
List of databases
Name | Owner | Encoding | Collate | Ctype | Access privileges
-----------+----------+----------+------------+------------+-----------------------
pg13test1 | postgres | UTF8 | en_US.utf8 | en_US.utf8 |
postgres | postgres | UTF8 | en_US.utf8 | en_US.utf8 |
template0 | postgres | UTF8 | en_US.utf8 | en_US.utf8 | =c/postgres +
| | | | | postgres=CTc/postgres
template1 | postgres | UTF8 | en_US.utf8 | en_US.utf8 | =c/postgres +
| | | | | postgres=CTc/postgres
(4 rows)
postgres-# \db+
********* QUERY **********
SELECT spcname AS "Name",
pg_catalog.pg_get_userbyid(spcowner) AS "Owner",
pg_catalog.pg_tablespace_location(oid) AS "Location",
pg_catalog.array_to_string(spcacl, E'\n') AS "Access privileges",
spcoptions AS "Options",
pg_catalog.pg_size_pretty(pg_catalog.pg_tablespace_size(oid)) AS "Size",
pg_catalog.shobj_description(oid, 'pg_tablespace') AS "Description"
FROM pg_catalog.pg_tablespace
ORDER BY 1;
**************************
List of tablespaces
Name | Owner | Location | Access privileges | Options | Size | Description
------------+----------+----------+-------------------+---------+--------+-------------
pg_default | postgres | | | | 29 MB |
pg_global | postgres | | | | 575 kB |
(2 rows)
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