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mysql事务处理学习记（MySQL transaction learning notes）.doc

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mysql事务处理学习记（MySQL transaction learning notes）

mysql事务处理学习记（MySQL transaction learning notes） Learn to write the MySQL transaction About the MySQL transaction START learning TRANSACTION, COMMIT and ROLLBACK START BEGIN [WORK] COMMIT | grammar TRANSACTION [WORK] [AND [NO] CHAIN] [[NO] RELEASE] ROLLBACK [WORK] [AND [NO] CHAIN] [[NO] RELEASE] SET AUTOCOMMIT = {0 1} | START TRANSACTION or BEGIN statement can start a new transaction. COMMIT can submit the current transaction, is to change a permanent change. ROLLBACK can rollback the current transaction, cancel its change. The SET AUTOCOMMIT statement can be disabled or enabled by default autocommit mode for the current connection. The WORK keyword is optional support for COMMIT and RELEASE, and the CHAIN and RELEASE clauses. CHAIN and RELEASE can be used to complete the additional control of affairs. The Completion_type values of the system variables determines the nature of the default. The AND CHAIN clause in the end of the current transaction, immediately start a new transaction, and have the same transaction isolation level and at the end of the transaction. The RELEASE clause in the termination of the transaction, will let the server disconnect from the client. Keywords containing NO can inhibit CHAIN or RELEASE. If the completion_type variable is set to a certain value, the chain or release can default, the NO keyword is useful. By default, MySQL uses the autocommit mode of operation. This means that when you perform an update for the (modified) after TABLE statement, MySQL immediately update stored to disk. If you are using a transaction safe storage engine (such as InnoDB, BDB or NDB clusters), you can use the following statement to disable autocommit mode: SET AUTOCOMMIT=0; the AUTOCOMMIT variable is set to zero, then disable autocommit mode, you must use COMMIT to change the stored to disk, or if you want to ignore since the beginning of the transaction to make changes, the use of ROLLBACK. If you want for a single series of statements to disable autocommi