postgres服務相關語法

遠程登錄

psql -h 主機 -U 用戶  -p端口  -W   -d 數據庫  #-W表示密碼，例如：psql -h 192.168.137.3 -U postgres  -p 5432 -W -d postgres

 遠程執行命令

psql -h 192.168.137.3 -p 5432 postgres postgres -A -c "select * from test limit 10"

 

查看全部數據庫

\l

切換數據庫

\c postgres

查看當前庫裏面的全部表

\dt

查看錶結構

\d  test

顯示全部用戶

\du

查看當前用戶和當前庫

#查看當前用戶
postgres=> select user;
  user  
--------
 dbuser
(1 row)

#查看當前庫
postgres=> select current_database();
 current_database 
------------------
 postgres
(1 row)

賦予全部用戶對錶的全部權限

grant all on test to public;

 注意：

能夠建大寫的表名可是要加上雙引號，並且使用工具navicat點擊的時候顯示沒有權限，可是能夠經過命令查看

 常常執行postgres命令的時候會雜亂顯示，能夠設置豎排查看

\x

 定製命令，進入數據庫使用 :命令 查詢

vim ~/.psqlrc

#查詢等待事件
\set wait_event 'select pid, usename, datname, query, client_addr from pg_stat_activity where pid <> pg_backend_pid() and wait_event is not null order by wait_event_type;'
#查詢數據庫鏈接數
\set connections_jqs 'select usename, datname, client_addr, count(*) from pg_stat_activity where pid <> pg_backend_pid() group by 1,2,3 order by 1,2,4 desc;'
#查詢活動會話
\set active_session_jqs 'select pid, usename, datname, query, client_addr from pg_stat_activity where pid <> pg_backend_pid() and state=\' active\' order by query;'

定製命令使用：

postgres=# :active_session_jqs;
 pid | usename | datname | query | client_addr 
-----+---------+---------+-------+-------------
(0 rows)

postgres=# :wait_event;
 pid  | usename  | datname  |                                  query                                   |  client_addr  
------+----------+----------+--------------------------------------------------------------------------+---------------
 7136 |          |          |                                                                          | 
 7138 | postgres |          |                                                                          | 
 7134 |          |          |                                                                          | 
 7133 |          |          |                                                                          | 
 7135 |          |          |                                                                          | 
 8400 | postgres | postgres |                                                                         +| 192.168.137.1
      |          |          | SELECT                                                                  +| 
      |          |          |     db.oid as did, db.datname, db.datallowconn,                         +| 
      |          |          |     pg_encoding_to_char(db.encoding) AS serverencoding,                 +| 
      |          |          |     has_database_privilege(db.oid, 'CREATE') as cancreate, datlastsysoid+| 
      |          |          | FROM                                                                    +| 
      |          |          |     pg_database db                                                      +| 
      |          |          | WHERE db.oid = 13287                                                     | 
(6 rows)

postgres=# :connections_jps;
ERROR:  syntax error at or near ":"
LINE 1: :connections_jps;
        ^
postgres=# :connections_jqs;  #沒弄明白爲啥第二次能夠得出結果
 usename  | datname  |  client_addr  | count 
----------+----------+---------------+-------
 postgres | postgres | 192.168.137.1 |     1
 postgres |          |               |     1
          |          |               |     4
(3 rows)