select * from current_user;
eg：
kerrydb=> select * from current_user;
current_user -------------- test(1 row)
方法2：
select user;
eg：
kerrydb=> select user;
user ------ test(1 row)kerrydb=>
方法3：
\c
eg：
kerrydb=> \c
You are now connected to database "kerrydb" as user "test".
此方法只使用与psql命令。
方法4：
\conninfo
eg：
postgres=# \conninfo
You are connected to database "postgres" as user "postgres" on host "127.0.0.1" at port "5432".
方法5：
current_user是the current user identifier
session_user是the current session user identifier。
postgres=# SELECT session_user, current_user;
session_user | current_user
--------------+-------------- postgres | postgres(1 row)PostgreSQL查看当前用户
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