Initiates a transaction and disables autocommit.
Transactions are a means to ensure a database's integrity when one or more queries fail. Queries are usually grouped together in logical blocks and are committed or rolled back when certain conditions are met. In general, any statement that alters a database record such as insert, delete and update is considered a transactional statement. Statements such as create database, create table, drop database, etc. should be executed outside of a transaction block.
mixed obj_transaction ( void )
Transaction instance or false on failure.
$trans = $dbh->obj_transaction();
$data = array( "color" => "blue",
"type" => "leather",
"price" => 36.95 );
$rs = $dbh->obj_update( "products", $data, "prod_id=21" );
if ( $dbh->obj_error() )
catch ( Exception $e )
//log error and/or redirect user to error page