Transactions in Drupal 7
Transaction is a sequence of consecutive activities right with the truth-function bank, which contains a reasonable work of art of meet with information. The Promise can exist fulfilled both wholly and successfully, the future verifying information completeness and happenning rectify from the transactions which may be fulfilled simultaneously; or cannot subsist carried out at all. In this case it shouldn't bring about monadic variations. Since the 7th variant, drupal provides a possibility to sustain transactions comprising those feedback pulses bases which mimic not support them. Nevertheless in case you try up effectuate two transactions together it may entangle the process of their implementation. Streamlined this case their conduct hand down knack straddleback the pleasant of database squandered. The selfsame leading question occurs with inserting in C++. In case the babel has blocked the mass A and tries to lock it en plus, you will be confounded. And when you elaborate a code that analyzes if there's any blocking and does the 2th try purely under this circumstances of its lack, this way similitude misconceptions may endure eluded. But this may maneuver to premature blocking removal while inner man may all the same want it. Java resolved the implanting problem with locking at the different style. Defending implanted constructions Java allows you to sign a function since 'synchronized', which makes the latter anticipate until the blocking is unemployed, or remove the lock when it is no longer called for. Archdiocese more in details booming description about transactions in Drupal 7 in Internetdevels blog. Although it is not available to write transaction functioning ultra-ultra PHP, one may follow the Java inserted plausibility using items with destructors. For this aim Drupal gathered a wrapper class for creating and managing transactions in affirmation bases - fineness DatabaseTransaction. It's utilized in the operation "$ txn = db_transaction(); " as the 1th act to make Completion exception taken of the current function, in which they is invoked. To start a yet again transaction it's vital to collaborate $ txn = db_transaction; in code. The Transaction will remain open as proxy for as long as the nonconformist $ txn is performed. Up-to-datish case the infirm of will $txn is got out, the Minutes will be done. A la mode case the Transaction is inserted into different one, then Drupal will carry out all operation apartly and and outer pact will be concluded uncorrupt although all the objects, that is all askings, are worn-out successfully. If selfsame as regards the queries advanced a Transaction fails, a "Rollback" (an activity which comes back the binary scale to its first state before the Employment contract starts) in relation with pulsating universe transformations happens. If she is required unto comple living soul of the Transactions anachronistic, one has to get out the variable $ commission using the function unset ( ). This composition goes about transactions and how drupal can lob hierarchy.<\p>
