psql工具默认开启自动提交功能（AUTOCOMMIT = 'on'）

1. 测试

postgres=# select version();                                            
version
-----------------------------------------------------------------------------
PostgreSQL 10.4 on x86_64-pc-linux-gnu, compiled by gcc (GCC) 4.8.5 20150623 (Red Hat 4.8.5-28), 64-bit
(1 row)
postgres=# \d test
Table "public.test"
Column |  Type   | Collation | Nullable | Default 
--------+---------+-----------+----------+---------
id     | integer |           |          | 
postgres=# insert into test values (1);
INSERT 0 1
postgres=# select * from test;
id 
----
1
(1 row)
postgres=# insert into test values (2);
INSERT 0 1
postgres=# rollback;
WARNING:  there is no transaction in progress
ROLLBACK
postgres=# select * from test;
id 
----
1
2
(2 rows)

2. 查看自动提交功能状态

postgres=# \set
AUTOCOMMIT = 'on'
COMP_KEYWORD_CASE = 'preserve-upper'
DBNAME = 'postgres'
ECHO = 'none'

3. 关闭自动提交功能

postgres=# \set AUTOCOMMIT off
postgres=# \set
AUTOCOMMIT = 'off'
COMP_KEYWORD_CASE = 'preserve-upper'
DBNAME = 'postgres'
ECHO = 'none'

4. 验证

postgres=# insert into test values (3);
INSERT 0 1
postgres=# select * from test;
id 
----
1
2
3
(3 rows)

postgres=# rollback;
ROLLBACK
postgres=# select * from test;
id 
----
1
2
(2 rows)

    postgres=#