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-$Id$
-
-PHP Data Objects
-================
-
-Concept: Data Access Abstraction
-
-Goals:
-
-1/  Be light-weight
-2/  Provide common API for common database operations
-3/  Be performant
-4/  Keep majority of PHP specific stuff in the PDO core (such as persistent
-    resource management); drivers should only have to worry about getting the
-    data and not about PHP internals.
-
-
-Transactions and autocommit
-===========================
-
-When you create a database handle, you *should* specify the autocommit
-behaviour that you require.  PDO will default to autocommit on.
-
-$dbh = new PDO("...", $user, $pass, array(PDO_ATTR_AUTOCOMMIT => true));
-
-When auto-commit is on, the driver will implicitly commit each query as it is
-executed.  This works fine for most simple tasks but can be significantly
-slower when you are making a large number of udpates.
-
-$dbh = new PDO("...", $user, $pass, array(PDO_ATTR_AUTOCOMMIT => false));
-
-When auto-commit is off, you must then use $dbh->beginWork() to initiate a
-transaction.  When your work is done, you then call $dbh->commit() or
-$dbh->rollBack() to persist or abort your changes respectively.
-Not all databases support transactions.
-
-You can change the auto-commit mode at run-time:
-
-$dbh->setAttribute(PDO_ATTR_AUTOCOMMIT, false);
-
-Regardless of the error handling mode set on the database handle, if the
-autocommit mode cannot be changed, an exception will be thrown.
-
-Some drivers will allow you to temporarily disable autocommit if you call
-$dbh->beginWork().  When you commit() or rollBack() such a transaction, the
-handle will switch back to autocommit mode again.  If the mode could not be
-changed, an exception will be raised, as noted above.
-
-When the database handle is closed or destroyed (or at request end for
-persistent handles), the driver will implicitly rollBack().  It is your
-responsibility to call commit() when you are done making changes and
-autocommit is turned off.
-
-vim:tw=78:et
-
-