php-src/ext/pdo
2005-10-07 23:23:44 +00:00
..
tests - MFH Add new test 2005-10-07 23:23:44 +00:00
config.m4 - Add optional dependency to SPL 2005-10-04 07:44:56 +00:00
config.w32 - Add optional dep for SPL under windows too 2005-10-04 07:47:11 +00:00
CREDITS Hello PDO. 2004-05-17 15:41:51 +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
package.xml Fix PECL Bug #5010 2005-09-11 19:44:26 +00:00
pdo_dbh.c free cls_methods correctly and fix segfault on shutdown 2005-10-03 23:27:26 +00:00
pdo_sql_parser.c and touch the generated file 2005-09-10 20:58:57 +00:00
pdo_sql_parser.re actually register PDO_PARAM_BOOL as a constant (doh!). 2005-09-10 20:58:19 +00:00
pdo_sqlstate.c Add sqlstates defined in PostgreSQL documentation. 2005-07-01 23:32:39 +00:00
pdo_stmt.c - MFH Fixed Bug #34590 User defined PDOStatement class can't implement 2005-09-21 22:58:39 +00:00
pdo.c nuke unused variable 2005-10-05 22:17:38 +00:00
pdo.php update ready for release 2005-02-09 04:54:56 +00:00
php_pdo_driver.h Fix Bug #34687; error information from query() not passed back 2005-10-02 22:11:19 +00:00
php_pdo_int.h Fix Bug #34687; error information from query() not passed back 2005-10-02 22:11:19 +00:00
php_pdo.h - MFH PDOException base 2005-10-02 20:38:18 +00:00
README rename ancient method 2005-02-09 23:34:53 +00:00
TODO better handling of pdo-level errors 2005-02-06 21:05:59 +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