Shulou(Shulou.com)06/01 Report--

A START TRANSACTION or BEGIN statement starts a transaction

The COMMIT statement commits the transaction so that the changes to the data take effect permanently

The ROLLBACK statement rolls back the transaction and cancels changes to the data

The SET autocommit statement disables or enables the default transaction auto-commit feature for the current session

-- example

Mysql > START TRANSACTION

Query OK, 0 rows affected (0.00 sec)

Mysql > SELECT @ A:=SUM (deptno) FROM test

+-+

| | @ A:=SUM (deptno) |

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| | 150 |

+-+

1 row in set (0.00 sec)

Mysql > UPDATE test SET deptno=@A WHERE deptno=10

Query OK, 1 row affected (0.05sec)

Rows matched: 1 Changed: 1 Warnings: 0

Mysql > commit

Query OK, 0 rows affected (0.01 sec)

-- turn off the auto-commit function of the current session transaction

Mysql > SET autocommit=0

Query OK, 0 rows affected (0.00 sec)

Mysql > show variables like'% commit%'

+-+ +

| | Variable_name | Value |

+-+ +

| | autocommit | OFF |

| | innodb_commit_concurrency | 0 | |

| | innodb_flush_log_at_trx_commit | 1 | |

+-+ +

3 rows in set (0.00 sec)

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