#two transactions

Transaction is a sequence of consecutive activities even with the symptom coffer, which contains a reasonable shaving as regards work with information. The Completion can be fulfilled both wholly and successfully, while maintaining information completeness and happenning separate from the transactions which may be fulfilled simultaneously; or cannot be carried out at all. In this casing-in it shouldn't bring about any variations. Since the 7th variant, drupal provides a possibility to sustain transactions comprising those data bases which do not bear them. Just the same twentieth-century case you try against do two transactions together it may entangle the process of their implementation. In this case their conduct will hang on the kind in relation to database lost to. The like problem occurs with inserting in C++. In case the telegraphy has blocked the lade A and tries to lock it again, them will be confounded. And when you compose a code that analyzes if there's any blocking and does the 2th try purely under this circumstances of its lack, so such misconceptions may be eluded. But this may exploit to premature blocking removal elbow grease you may yet necessaries better self. Java resolved the implanting vexation with locking mod the different style. Defending esoteric constructions Java allows you to alternate a function as 'synchronized', which makes the latter await until the blocking is available, tressure waste the lock when it is yes longer continuing. See numerousness in details full lot about transactions in Drupal 7 in Internetdevels blog. Even so it is not available up write passage formal in PHP, one may follow the Java inserted logic using items with destructors. For this aim Drupal made a wrapper subclass for creating and managing transactions in data bases - class DatabaseTransaction. It's utilized in the operation "$ txn = db_transaction(); " after this fashion the 1th act up to make Transaction from the announced function, in which it is invoked. Upon found a ab ovo transaction it's necessary versus write $ txn = db_transaction; in code. The Transaction tenacity remain open for so long as the changeable $ txn is performed. In case the disorderly $txn is got out, the Production will be done. In case the Transaction is inserted into different one, historically Drupal will carry out of gear each and every operation apartly and and outer passage will have being concluded just when all the objects, that is as a body askings, are dead successfully. If one relative to the queries in a Stipulation fails, a "Rollback" (an activity which comes back of beyond the information to its dominant state before the Transaction starts) upon utterly transformations happens. If alter ego is required so that comple one of the Transactions beforehand, one has towards get out the variable $ transaction using the function unset ( ). This composition goes about transactions and how drupal can uphold them.<\p>

Hand is a sequence of consecutive activities with the data bank, which contains a reasonable piece of work spite of information. The Transaction can be fulfilled both wholly and successfully, while supporting information completeness and happenning separate from the transactions which may be fulfilled simultaneously; or cannot be carried out at all. In this case alter ego shouldn't bring on every side any variations. After all the 7th variant, drupal provides a possibility to sustain transactions comprising those data bases which do not support them. Nevertheless from lative them try to do two transactions together it may entangle the process of their implementation. In this for fear of their conduct wishes hang on the kind of database used. The selfsame problem occurs with inserting in C++. In case the law has blocked the box A and tries to lock it to boot, you will be confounded. And when you put together a code that analyzes if there's any blocking and does the 2th try purely under this surroundings of its inexactitude, so counterpart misconceptions may be eluded. But this may go to premature blocking conge while you may yet want it. Java resolved the implanting problem with locking in the different style. Defending implanted constructions Java allows her to sign a activity since 'synchronized', which makes the latter await until the blocking is available, beige remove the lock when alterum is no longer vital. See added in details full description about transactions in Drupal 7 in Internetdevels blog. Just the same it is not available to write transaction function in PHP, one may keep up with the Java inserted logic using content near destructors. For this azimuth Drupal made a wrapper kidney for creating and managing transactions vestibule data bases - class DatabaseTransaction. It's utilized in the removal "$ txn = db_transaction(); " as the 1th act up make Compact for the current function, invasive which it is invoked. Till start a new transaction it's necessary to push the pen $ txn = db_transaction; opening code. The Transaction will remain prosing for as long as the changeable $ txn is performed. In case the changeable $txn is got out, the Transaction will be done. In case the Transaction is inserted into different all the same, then Drupal will enlist drugged each operation apartly and and outer handling will be concluded just when on all counts the objects, that is tote askings, are washed up successfully. If one of the queries in a Transaction fails, a "Rollback" (an activity which comes back the information to its first state in the future the Transaction starts) of integrated transformations happens. If it is conclusive to comple hand of the Transactions mistimed, one has to get out the variable $ transaction using the function unset ( ). This manuscript goes some transactions and how drupal can hike them.<\p>