此文章是根據官方改變

模擬帳戶轉賬流程 1.JOHN帳戶扣除-DAVID帳戶增加-記錄日志－事務提交 三個操作必須全部完成此事務才完成，否則失敗 創建帳戶余額表自增字段自增序列； createsequencesaving_seqincrementby1startwith1maxvalue999999999999999999nocyclecache20; 創建支票表自增字段自增序列； createsequencecheck_seqincrementby1startwith1maxvalue999999999999999999nocyclecache20; 創建日志記錄自增字段自增序列；l create?sequence?log_seq?increment?by?1?start?with?1?maxvalue?999999999999999999?nocycle?cache?20?; 2.創建余額表saving_accounts createtablesaving_accounts (account_idintprimarykey, account_namevarchar2(20) , paynumber(15,2) ); commentontablesaving_accountsis?'帳戶余額表'; commentoncolumnsaving_accounts.account_idis'帳戶ID'; commentoncolumnsaving_accounts.account_nameis'帳戶名稱'; commentoncolumnsaving_accounts.payis'帳戶余額'; 創建支票余額表 createtablechecking_accounts (check_idintprimarykey, check_namevarchar2(20) , check_paynumber(15,2) ); commentontablechecking_accountsis?'支票帳戶余額表'; commentoncolumnchecking_accounts.check_idis'支票帳戶ID'; commentoncolumnchecking_accounts.check_nameis'支票帳戶名稱'; commentoncolumnchecking_accounts.check_payis'支票帳戶余額'; 創建轉賬日志表 createtablelog_accounts (log_idintprimarykey, log_datedate?default(sysdate)notnull, account_idintnotnull, check_idintnotnull, change_paynumber(15,2) ); commentontablelog_accountsis?'轉賬日志表'; commentoncolumnlog_accounts.log_idis'轉賬日志ID'; commentoncolumnlog_accounts.log_dateis'轉賬日期'; commentoncolumnlog_accounts.account_idis'轉賬帳戶ID'; commentoncolumnlog_accounts.check_idis'支票帳戶ID'; commentoncolumnlog_accounts.change_payis'支票帳戶余額'; 查詢建表是否成功 select*fromlog_accounts; select*fromsaving_accounts; select*fromchecking_accounts; 3.插入數據 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; 用戶轉賬的步驟（轉賬到支票） 如john 防止事務失敗可以加入異常處理 begin savepoint sp1 --SET TRANSACTION NAME 'account_update'; 可以設置事務名稱transaction name --減少john 帳戶余額200轉入到david update saving_accounts a set pay=pay-200 where a.account_id=1; --SAVEPOINT after_update_savind_accounts; 設置rollback點 --增加david支票余額 update checking_accounts b set check_pay=check_pay+200 where b.check_id=2; --寫入日志表 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; 回滾到saingpoint??after_update_savind_accounts --rollback 將回滾事務account_update exception
? when others then
????? rollback to savepoint sp1;
end; commit work; 總結: 如果在一個 SQL 語句在執行過程中發生了錯誤，那么此語句對數據庫產生的影響將被回滾（roll back）?；貪L后就如同此語句從未執行過。

轉載于:https://www.cnblogs.com/shawnloong/p/3295503.html

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