php-src/ext/pdo
Ilia Alshanetsky b8590f954d Fixed test
2006-12-09 16:41:24 +00:00
..
tests Fixed test 2006-12-09 16:41:24 +00:00
config.m4 it's not a PEAR only issue 2006-08-24 16:00:43 +00:00
config.w32 - Add optional dep for SPL under windows too 2005-10-04 07:47:11 +00:00
CREDITS Added myself to PDO and PDO_MySQL credits 2006-03-23 18:36:47 +00:00
EXPERIMENTAL Hello PDO. 2004-05-17 15:41:51 +00:00
Makefile.frag Allow it build with PHP 5.0.x and up again. 2005-05-14 20:06:54 +00:00
package2.xml Note addition of new class constants 2006-05-04 00:21:51 +00:00
pdo_dbh.c Fixed bug #38252 (Incorrect PDO error message on invalid default fetch mode). 2006-12-04 02:40:08 +00:00
pdo_sql_parser.c Fixed bug #36798 (Error parsing named parameters with queries containing 2006-12-05 18:04:59 +00:00
pdo_sql_parser.re Fixed bug #36798 (Error parsing named parameters with queries containing 2006-12-05 18:04:59 +00:00
pdo_sqlstate.c bump year and license version 2006-01-01 12:51:34 +00:00
pdo_stmt.c Fixed bug #39759 (Can't use stored procedures fetching multiple result 2006-12-08 19:50:40 +00:00
pdo.c Remove bogus ini entry 2006-10-14 15:06:11 +00:00
pdo.php update ready for release 2005-02-09 04:54:56 +00:00
php_pdo_driver.h MFH 2006-09-28 23:27:59 +00:00
php_pdo_int.h - MFH 2006-05-11 22:43:44 +00:00
php_pdo.h Get rid of useless function calls 2006-06-07 21:09:52 +00:00
README rename ancient method 2005-02-09 23:34:53 +00:00
TODO update the todo list 2005-11-26 21:29:31 +00:00

$Id$

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->beginTransaction() 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->beginTransaction().  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