1.使用show engines 命令確定系統中是否有任何事務存儲引擎可用以及哪個是默認引擎。

2.使用set autocommit 語句啟用autocommit。

3.為使用world數據庫做準備，確認city表使用事務存儲引擎innodb。

4.使用start transaction 語句顯式啟動新事務。

5.刪除一行。

6.使用rollback語句回滾打開的事務。

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1.

mysql> show engines\G *************************** 1. row ***************************Engine: PERFORMANCE_SCHEMASupport: YESComment: Performance Schema Transactions: NOXA: NOSavepoints: NO *************************** 2. row ***************************Engine: CSVSupport: YESComment: CSV storage engine Transactions: NOXA: NOSavepoints: NO *************************** 3. row ***************************Engine: MRG_MYISAMSupport: YESComment: Collection of identical MyISAM tables Transactions: NOXA: NOSavepoints: NO *************************** 4. row ***************************Engine: BLACKHOLESupport: YESComment: /dev/null storage engine (anything you write to it disappears) Transactions: NOXA: NOSavepoints: NO *************************** 5. row ***************************Engine: MyISAMSupport: YESComment: MyISAM storage engine Transactions: NOXA: NOSavepoints: NO *************************** 6. row ***************************Engine: MEMORYSupport: YESComment: Hash based, stored in memory, useful for temporary tables Transactions: NOXA: NOSavepoints: NO *************************** 7. row ***************************Engine: ARCHIVESupport: YESComment: Archive storage engine Transactions: NOXA: NOSavepoints: NO *************************** 8. row ***************************Engine: InnoDBSupport: DEFAULTComment: Supports transactions, row-level locking, and foreign keys Transactions: YESXA: YESSavepoints: YES *************************** 9. row ***************************Engine: FEDERATEDSupport: NOComment: Federated MySQL storage engine Transactions: NULLXA: NULLSavepoints: NULL 9 rows in set (0.00 sec)

2.

mysql> set autocommit = 1; Query OK, 0 rows affected (0.00 sec)mysql> select @@autocommit; +--------------+ | @@autocommit | +--------------+ | 1 | +--------------+ 1 row in set (0.00 sec)

3.

mysql> use world Reading table information for completion of table and column names You can turn off this feature to get a quicker startup with -ADatabase changedmysql> show create table city\G *************************** 1. row ***************************Table: city Create Table: CREATE TABLE `city` (`ID` int(11) NOT NULL AUTO_INCREMENT,`Name` char(35) NOT NULL DEFAULT '',`CountryCode` char(3) NOT NULL DEFAULT '',`District` char(20) NOT NULL DEFAULT '',`Population` int(11) NOT NULL DEFAULT '0',PRIMARY KEY (`ID`),KEY `CountryCode` (`CountryCode`),CONSTRAINT `city_ibfk_1` FOREIGN KEY (`CountryCode`) REFERENCES `country` (`Code`) ) ENGINE=InnoDB AUTO_INCREMENT=4080 DEFAULT CHARSET=latin1 1 row in set (0.00 sec)

4.

mysql> start transaction; Query OK, 0 rows affected (0.00 sec)

5.

mysql> select * from city where name = 'manta'; +-----+-------+-------------+----------+------------+ | ID | Name | CountryCode | District | Population | +-----+-------+-------------+----------+------------+ | 600 | Manta | ECU | Manab鉚 | 164739 | +-----+-------+-------------+----------+------------+ 1 row in set (0.01 sec)mysql> delete from city where name = 'manta'; Query OK, 1 row affected (0.02 sec)mysql> select * from city where name = 'manta'; Empty set (0.00 sec)mysql> rollback; Query OK, 0 rows affected (0.02 sec)mysql> select * from city where name = 'manta'; +-----+-------+-------------+----------+------------+ | ID | Name | CountryCode | District | Population | +-----+-------+-------------+----------+------------+ | 600 | Manta | ECU | Manab鉚 | 164739 | +-----+-------+-------------+----------+------------+ 1 row in set (0.01 sec)

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轉載于:https://www.cnblogs.com/tomatoes-/p/6024445.html

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