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doctrine2/lib/Doctrine/Connection/Oracle.php

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<?php
/*
* $Id$
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* This software consists of voluntary contributions made by many individuals
* and is licensed under the LGPL. For more information, see
* <http://www.phpdoctrine.com>.
*/
Doctrine::autoload('Doctrine_Connection');
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/**
* Doctrine_Connection_Oracle
*
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* @package Doctrine
* @license http://www.opensource.org/licenses/lgpl-license.php LGPL
* @category Object Relational Mapping
* @link www.phpdoctrine.com
* @since 1.0
* @version $Revision$
* @author Konsta Vesterinen <kvesteri@cc.hut.fi>
*/
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class Doctrine_Connection_Oracle extends Doctrine_Connection {
/**
* @var string $driverName the name of this connection driver
*/
protected $driverName = 'Oracle';
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public function __construct(Doctrine_Manager $manager, $adapter) {
$this->supported = array(
'sequences' => true,
'indexes' => true,
'summary_functions' => true,
'order_by_text' => true,
'current_id' => true,
'affected_rows' => true,
'transactions' => true,
'savepoints' => true,
'limit_queries' => true,
'LOBs' => true,
'replace' => 'emulated',
'sub_selects' => true,
'auto_increment' => false, // implementation is broken
'primary_key' => true,
'result_introspection' => true,
'prepared_statements' => true,
'identifier_quoting' => true,
'pattern_escaping' => true,
);
$this->options['DBA_username'] = false;
$this->options['DBA_password'] = false;
$this->options['database_name_prefix'] = false;
$this->options['emulate_database'] = true;
$this->options['default_tablespace'] = false;
$this->options['default_text_field_length'] = 2000;
$this->options['result_prefetching'] = false;
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parent::__construct($manager, $adapter);
}
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/**
* Adds an driver-specific LIMIT clause to the query
*
* @param string $query query to modify
* @param integer $limit limit the number of rows
* @param integer $offset start reading from given offset
* @return string the modified query
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*/
public function modifyLimitQuery($query, $limit, $offset) {
/**
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$e = explode("select ",strtolower($query));
$e2 = explode(" from ",$e[1]);
$fields = $e2[0];
*/
if (preg_match('/^\s*SELECT/i', $query)) {
if ( ! preg_match('/\sFROM\s/i', $query)) {
$query .= " FROM dual";
}
if ($limit > 0) {
// taken from http://svn.ez.no/svn/ezcomponents/packages/Database
$max = $offset + $limit;
if ($offset > 0) {
$min = $offset + 1;
$query = 'SELECT * FROM (SELECT a.*, ROWNUM dctrn_rownum FROM (' . $query
. ') a WHERE ROWNUM <= ' . $max . ') WHERE dctrn_rownum >= ' . $min;
} else {
$query = 'SELECT a.* FROM (' . $query .') a WHERE ROWNUM <= ' . $max;
}
}
}
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return $query;
}
/**
* Set the transacton isolation level.
*
* example:
*
* <code>
* $conn->setTransactionIsolation('READ UNCOMMITTED');
* </code>
*
* @param string standard isolation level
* READ UNCOMMITTED (allows dirty reads)
* READ COMMITTED (prevents dirty reads)
* REPEATABLE READ (prevents nonrepeatable reads)
* SERIALIZABLE (prevents phantom reads)
* @throws PDOException if something fails at the PDO level
* @return void
*/
public function setTransactionIsolation($isolation) {
switch($isolation) {
case 'READ UNCOMMITTED':
$isolation = 'READ COMMITTED';
break;
case 'READ COMMITTED':
case 'REPEATABLE READ':
case 'SERIALIZABLE':
$isolation = 'SERIALIZABLE';
break;
default:
throw new Doctrine_Connection_Oracle_Exception('Isolation level ' . $isolation . ' is not supported.');
}
$query = 'ALTER SESSION ISOLATION LEVEL ' . $isolation;
return $this->dbh->query($query);
}
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/**
* returns the next value in the given sequence
*
* @param string $sequence name of the sequence
* @throws PDOException if something went wrong at database level
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* @return integer
*/
public function nextId($sequence) {
$stmt = $this->query('SELECT ' . $sequence . '.nextval FROM dual');
$data = $stmt->fetch(PDO::FETCH_NUM);
return $data[0];
}
/**
* Returns the current id of a sequence
*
* @param string $sequence name of the sequence
* @throws PDOException if something went wrong at database level
* @return mixed id
*/
public function currId($sequence) {
$sequence = $this->quoteIdentifier($this->getSequenceName($sequence), true);
$stmt = $this->query('SELECT ' . $sequence . '.currval FROM dual');
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$data = $stmt->fetch(PDO::FETCH_NUM);
return $data[0];
}
}