php-src/ext/pdo
Wez Furlong 0d002664fb Implement empty-string-to-null conversion option for oracle compat.
This can be enabled using:
	$dbh->setAttribute(PDO_ATTR_ORACLE_NULLS, true);
2004-07-19 09:35:36 +00:00
..
config.m4 Cosmetics 2004-05-19 13:28:05 +00:00
config.w32 Add parser to win32 build 2004-05-18 15:58:00 +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 Let it install correctly when built via phpize 2004-05-19 15:27:27 +00:00
package.xml Bump the version number 2004-05-21 22:26:45 +00:00
pdo_dbh.c Implement empty-string-to-null conversion option for oracle compat. 2004-07-19 09:35:36 +00:00
pdo_sql_parser.c ok, apprently we _don't_ want to count the nulls. 2004-05-21 22:24:20 +00:00
pdo_sql_parser.re ok, apprently we _don't_ want to count the nulls. 2004-05-21 22:24:20 +00:00
pdo_stmt.c Implement empty-string-to-null conversion option for oracle compat. 2004-07-19 09:35:36 +00:00
pdo.c Implement empty-string-to-null conversion option for oracle compat. 2004-07-19 09:35:36 +00:00
pdo.php Hello PDO. 2004-05-17 15:41:51 +00:00
php_pdo_driver.h Implement empty-string-to-null conversion option for oracle compat. 2004-07-19 09:35:36 +00:00
php_pdo_int.h Version 1 of PDO_FETCH_LAZY 2004-05-21 13:26:58 +00:00
php_pdo_sql_parser.h license/copyright block 2004-05-18 15:22:58 +00:00
php_pdo.h Tweaks for win32 2004-05-18 15:57:46 +00:00
README Hello PDO. 2004-05-17 15:41:51 +00:00
TODO Hello PDO. 2004-05-17 15:41:51 +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->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