Oracle vs PostgreSQL，研发注意事项（6）- 事务处理

本节介绍了Oracle和PG在事务处理上面的部分不同点。
Oracle
Oracle数据库，在同一个事务中的多个语句，如某个语句执行出错，该语句不影响其他语句的执行，如事务提交，则执行成功语句会持久化到DB中。
测试脚本：

TEST-orcl@server4>drop table tbl3;
Table dropped.
TEST-orcl@server4>create table tbl3(var varchar(2),fixed char(2));
Table created.
TEST-orcl@server4>
TEST-orcl@server4>insert into tbl3 values('1','1');
1 row created.
TEST-orcl@server4>insert into tbl3 values('2','2');
1 row created.
TEST-orcl@server4>insert into tbl3 values('测试x3','测试x3');
insert into tbl3 values('测试x3','测试x3')
                        *
ERROR at line 1:
ORA-12899: value too large for column "TEST"."TBL3"."VAR" (actual: 6, maximum:
2)

TEST-orcl@server4>insert into tbl3 values('4','4');
1 row created.
TEST-orcl@server4>
TEST-orcl@server4>commit;
Commit complete.
TEST-orcl@server4>
TEST-orcl@server4>select * from tbl3;
VA FI
-- --
1  1
2  2
4  4
TEST-orcl@server4>

PG
PG数据库，在同一个事务中的多个语句，如某个SQL语句执行出错，则就算在其后执行commit，事务也会回滚。如在该出错语句之后执行其他DML语句，则会报错。

testdb=# drop table if exists tbl3;
 tbl3;DROP TABLE
testdb=# create table tbl3(var varchar(2),fixed char(2));
CREATE TABLE
testdb=# 
testdb=# begin;
BEGIN
testdb=# 
testdb=# insert into tbl3 values('1','1');
INSERT 0 1
testdb=# insert into tbl3 values('2','2');
INSERT 0 1
testdb=# insert into tbl3 values('测试3','测试3');
ERROR:  value too long for type character varying(2)
testdb=# insert into tbl3 values('4','4');
ERROR:  current transaction is aborted, commands ignored until end of transaction block
testdb=# 
testdb=# commit;
ROLLBACK
testdb=# 
testdb=# select * from tbl3;
 var | fixed 
-----+-------
(0 rows)