oracle 事务测试

此文章是根据官方改变

模拟帐户转账流程

1.JOHN帐户扣除-DAVID帐户增加-记录日志－事务提交

三个操作必须全部完成此事务才完成，否则失败

创建帐户余额表自增字段 自增序列 ；

create   sequence   saving_seq   increment   by   1   start   with   1   maxvalue   999999999999999999   nocycle   cache   20 ;

创建支票表自增字段 自增序列；

create   sequence   check_seq   increment   by   1   start   with   1   maxvalue   999999999999999999   nocycle   cache   20 ;

创建日志记录自增字段自增序列；l

create   sequence log _seq  increment   by   1  start   with   1  maxvalue   999999999999999999   nocycle  cache   20  ;

 

2.创建余额表saving_accounts

create   table   saving_accounts

(account_id   int   primary   key   ,

account_name   varchar2 (   20 ) ,

pay   number (   15 , 2   ) );

comment   on   table   saving_accounts   is     '帐户余额表'   ;

comment   on   column   saving_accounts.account_id   is   '帐户ID'   ;

comment   on   column   saving_accounts.account_name   is   '帐户名称'   ;

comment   on   column   saving_accounts.pay   is   '帐户余额'   ;

 

创建支票余额表

create   table   checking_accounts

(check_id   int   primary   key   ,

check_name   varchar2 (   20 ) ,

check_pay   number (   15 , 2   ) );

comment   on   table   checking_accounts   is     '支票帐户余额表'   ;

comment   on   column   checking_accounts.check_id   is   '支票帐户ID'   ;

comment   on   column   checking_accounts.check_name   is   '支票帐户名称'   ;

comment   on   column   checking_accounts.check_pay   is   '支票帐户余额'   ;

 

创建转账日志表

create   table   log_accounts

(log_id   int   primary   key   ,

log_date   date     default   ( sysdate   )   not   null ,

account_id   int   not   null   ,

check_id   int   not   null   ,

change_pay   number (   15 , 2   ) );

comment   on   table   log_accounts   is     '转账日志表'   ;

comment   on   column   log_accounts.log_id   is   '转账日志ID'   ;

comment   on   column   log_accounts.log_date   is   '转账日期'   ;

comment   on   column   log_accounts.account_id   is   '转账帐户ID'   ;

comment   on   column   log_accounts.check_id   is   '支票帐户ID'   ;

comment   on   column   log_accounts.change_pay   is   '支票帐户余额'   ;

 

查询建表是否成功

select   *   from   log_accounts;

select   *   from   saving_accounts;

select   *   from   checking_accounts;

 

3.插入数据

插入  saving_accounts

insert into saving_accounts

values( saving_seq.nextval,'john',1000);

insert into saving_accounts

values( saving_seq.nextval,'david',2000);

insert into saving_accounts

values( saving_seq.nextval,'alex',3000);

insert into saving_accounts

values( saving_seq.nextval,'lily',5000);

insert into saving_accounts

values( saving_seq.nextval,'joe',1500);

commit;

 

插入checking_accounts

insert into  checking_accounts

values (  check_seq .nextval,'john',2000);

insert into  checking_accounts

values (  check_seq .nextval,'david',500);

insert into  checking_accounts

values (  check_seq .nextval,'alex',2000);

insert into  checking_accounts

values (  check_seq .nextval,'lily',1500);

insert into  checking_accounts

values (  check_seq .nextval,'joe',4000);

commit;

 

用户转账的步骤（转账到支票）

如john

防止事务失败可以加入异常处理

begin

savepoint sp1

--SET TRANSACTION NAME 'account_update'; 可以设置事务名称transaction name

--减少john 帐户余额200转入到david

update saving_accounts a

set pay=pay-200

where a.account_id=1;

--SAVEPOINT after_update_savind_accounts; 设置rollback点

--增加david支票余额

update checking_accounts b

set check_pay=check_pay+200

where b.check_id=2;

--写入日志表

insert into  log_accounts(log_id,account_id,check_id,change_pay)

values(log _seq.nextval,1,2,200);

--ROLLBACK TO SAVEPOINT  after_update_savind_accounts; 回滚到saingpoint  after_update_savind_accounts

--rollback 将回滚事务account_update

exception
  when others then
      rollback to savepoint sp1;
end;

commit work;

 

总结:

如果在一个 SQL 语句在执行过程中发生了错误，那么此语句对数据库产生的影响将被回滚（roll back）。回滚后就如同此语句从未执行过。