postgresql - 如何断开与数据库的连接并返回到 PostgreSQL 中的默认数据库？

Question

我正在使用 PostgreSql 版本:

postgres=# select version();
                           version
-------------------------------------------------------------
 PostgreSQL 9.2.4, compiled by Visual C++ build 1600, 64-bit
(1 row)

我已经连接到一个数据库，从 postgres=# 到 newdb=#....现在我在 newdb=# 数据库中，我想断开它并返回到 postgres=# 数据库....

如何做到这一点？

我试过 disconnect newdb;

但它给出了 erroe as::

postgres=# create database newdb;
CREATE DATABASE
postgres=# \c newdb;
WARNING: Console code page (437) differs from Windows code page (1252)
         8-bit characters might not work correctly. See psql reference
         page "Notes for Windows users" for details.
You are now connected to database "newdb" as user "postgres".
newdb=# disconnect newdb;
ERROR:  syntax error at or near "disconnect"
LINE 1: disconnect newdb;
        ^
newdb=#

它不起作用是否有任何其他方法可以做到这一点，或者我有什么不对的地方!!

Answer 1

很简单，看例子。

--我的数据库

postgres=# \l
                               List of databases
   Name    |  Owner   | Encoding | Collate | Ctype |     Access privileges     
-----------+----------+----------+---------+-------+---------------------------
 francs    | postgres | UTF8     | C       | C     | =Tc/postgres             +
           |          |          |         |       | postgres=CTc/postgres    +
           |          |          |         |       | francs=C*T*c*/postgres   +
           |          |          |         |       | select_only=c/francs
 postgres  | postgres | UTF8     | C       | C     | 
 source_db | postgres | UTF8     | C       | C     | =Tc/postgres             +
           |          |          |         |       | postgres=CTc/postgres    +
           |          |          |         |       | source_db=C*T*c*/postgres
 template0 | postgres | UTF8     | C       | C     | =c/postgres              +
           |          |          |         |       | postgres=CTc/postgres
 template1 | postgres | UTF8     | C       | C     | =c/postgres              +
           |          |          |         |       | postgres=CTc/postgres
(5 rows)

--切换到db francs作为角色francs

postgres=# \c francs francs
You are now connected to database "francs" as user "francs".

--swith to db postgres as role postgres

francs=> \c postgres postgres

You are now connected to database "postgres" as user "postgres".
postgres=# 

--断开与数据库的连接

postgres=# \q