Transaction
class Transaction
A wrapper class for creating and managing database transactions.
Not all databases or database configurations support transactions. For example, MySQL MyISAM tables do not. It is also easy to begin a transaction and then forget to commit it, which can lead to connection errors when another transaction is started.
This class acts as a wrapper for transactions. To begin a transaction, simply instantiate it. When the object goes out of scope and is destroyed it will automatically commit. It also will check to see if the specified connection supports transactions. If not, it will simply skip any transaction commands, allowing user-space code to proceed normally. The only difference is that rollbacks won't actually do anything.
In the vast majority of cases, you should not instantiate this class directly. Instead, call ->startTransaction(), from the appropriate connection object.