在 PostgreSQL 的事务中；执行的SQL遇到错误（书写，约束限制）；该事务的已经执行的SQL都会进行rollback。那如何忽略其中的错误。将SQL执行到底？在事务中设置 ON_ERROR_ROLLBACK 即可。
1、未作任何设置
begin;
-- 1、创建表tbl_test_01
create table tbl_test_01(id int primary key, info text);
-- 2、插入异常数据
insert into tbl_test_01 values ('hello', 'PostgreSQL');
-- 3、插入正常数据
insert into tbl_test_01 values (1001, 'PostgreSQL');
postgres=# begin;
BEGIN
postgres=# create table tbl_test_01(id int primary key, info text);
CREATE TABLE
postgres=# insert into tbl_test_01 values ('hello', 'PostgreSQL');
ERROR: invalid input syntax for type integer: "hello"
LINE 1: insert into tbl_test_01 values ('hello', 'PostgreSQL');
postgres=# insert into tbl_test_01 values (1001, 'PostgreSQL');
ERROR: current transaction is aborted, commands ignored until end of transaction block
postgres=# end;
ROLLBACK
postgres=# \d tbl_test_01
Did not find any relation named "tbl_test_01".
执行结果是ROLLBACK
执行的正常SQL也ROLLBACK
2、设置 ON_ERROR_ROLLBACK
begin;
\set ON_ERROR_ROLLBACK interactive
create table tbl_test_01(id int primary key, info text);
insert into tbl_test_01 values ('hello', 'PostgreSQL');
insert into tbl_test_01 values (1001, 'PostgreSQL');
postgres=# begin;
BEGIN
postgres=# \set ON_ERROR_ROLLBACK interactive
postgres=# create table tbl_test_01(id int primary key, info text);
CREATE TABLE
postgres=# insert into tbl_test_01 values ('hello', 'PostgreSQL');
ERROR: invalid input syntax for type integer: "hello"
LINE 1: insert into tbl_test_01 values ('hello', 'PostgreSQL');
postgres=# insert into tbl_test_01 values (1001, 'PostgreSQL');
INSERT 0 1
postgres=# end;
COMMIT
postgres=# \d tbl_test_01
Table "public.tbl_test_01"
Column | Type | Collation | Nullable | Default
--------+---------+-----------+----------+---------
id | integer | | not null |
info | text | | |
Indexes:
"tbl_test_01_pkey" PRIMARY KEY, btree (id)
postgres=# select * from tbl_test_01;
id | info
------+------------
1001 | PostgreSQL
(1 row)
执行结果是COMMIT
表 tbl_test_01 成功创建
数据 (1001, 'PostgreSQL') 也成功插入
