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doctrine2/lib/Doctrine/Connection/Mssql.php
2007-01-29 20:10:51 +00:00

199 lines
7.5 KiB
PHP

<?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');
/**
* Doctrine_Connection_Mssql
*
* @package Doctrine
* @license http://www.opensource.org/licenses/lgpl-license.php LGPL
* @author Konsta Vesterinen <kvesteri@cc.hut.fi>
* @author Lukas Smith <smith@pooteeweet.org> (PEAR MDB2 library)
* @version $Revision$
* @category Object Relational Mapping
* @link www.phpdoctrine.com
* @since 1.0
*/
class Doctrine_Connection_Mssql extends Doctrine_Connection
{
/**
* @var string $driverName the name of this connection driver
*/
protected $driverName = 'Mssql';
/**
* the constructor
*
* @param Doctrine_Manager $manager
* @param PDO $pdo database handle
*/
public function __construct(Doctrine_Manager $manager, $adapter)
{
// initialize all driver options
$this->supported = array(
'sequences' => 'emulated',
'indexes' => true,
'affected_rows' => true,
'transactions' => true,
'summary_functions' => true,
'order_by_text' => true,
'current_id' => 'emulated',
'limit_queries' => 'emulated',
'LOBs' => true,
'replace' => 'emulated',
'sub_selects' => true,
'auto_increment' => true,
'primary_key' => true,
'result_introspection' => true,
'prepared_statements' => 'emulated',
);
parent::__construct($manager, $adapter);
}
/**
* quoteIdentifier
* Quote a string so it can be safely used as a table / column name
*
* Quoting style depends on which database driver is being used.
*
* @param string $identifier identifier name to be quoted
* @param bool $checkOption check the 'quote_identifier' option
*
* @return string quoted identifier string
*/
public function quoteIdentifier($identifier, $checkOption = false)
{
if ($checkOption && ! $this->getAttribute(Doctrine::ATTR_QUOTE_IDENTIFIER)) {
return $identifier;
}
return '[' . str_replace(']', ']]', $identifier) . ']';
}
/**
* Adds an adapter-specific LIMIT clause to the SELECT statement.
* [ borrowed from Zend Framework ]
*
* @param string $query
* @param mixed $limit
* @param mixed $offset
* @link http://lists.bestpractical.com/pipermail/rt-devel/2005-June/007339.html
* @return string
*/
public function modifyLimitQuery($query, $limit, $offset, $isManip = false)
{
if ($limit > 0) {
// we need the starting SELECT clause for later
$select = 'SELECT ';
if (preg_match('/^[[:space:]*SELECT[[:space:]]*DISTINCT/i', $query, $matches) == 1) {
$select .= 'DISTINCT ';
}
$length = strlen($select);
// is there an offset?
if (! $offset) {
// no offset, it's a simple TOP count
return $select . ' TOP ' . $limit . substr($query, $length);
}
// the total of the count **and** the offset, combined.
// this will be used in the "internal" portion of the
// hacked-up statement.
$total = $limit + $offset;
// build the "real" order for the external portion.
$order = implode(',', $parts['order']);
// build a "reverse" order for the internal portion.
$reverse = $order;
$reverse = str_ireplace(" ASC", " \xFF", $reverse);
$reverse = str_ireplace(" DESC", " ASC", $reverse);
$reverse = str_ireplace(" \xFF", " DESC", $reverse);
// create a main statement that replaces the SELECT
// with a SELECT TOP
$main = $select . ' TOP ' . $total . substr($query, $length);
// build the hacked-up statement.
// do we really need the "as" aliases here?
$query = 'SELECT * FROM ('
. 'SELECT TOP ' . $count . ' * FROM (' . $main . ') AS select_limit_rev ORDER BY '. $reverse
. ') AS select_limit ORDER BY ' . $order;
}
return $query;
}
/**
* return version information about the server
*
* @param bool $native determines if the raw version string should be returned
* @return mixed array/string with version information or MDB2 error object
*/
public function getServerVersion($native = false)
{
if ($this->serverInfo) {
$serverInfo = $this->serverInfo;
} else {
$query = 'SELECT @@VERSION';
$serverInfo = $this->fetchOne($query);
}
// cache server_info
$this->serverInfo = $serverInfo;
if ( ! $native) {
if (preg_match('/([0-9]+)\.([0-9]+)\.([0-9]+)/', $serverInfo, $tmp)) {
$serverInfo = array(
'major' => $tmp[1],
'minor' => $tmp[2],
'patch' => $tmp[3],
'extra' => null,
'native' => $serverInfo,
);
} else {
$serverInfo = array(
'major' => null,
'minor' => null,
'patch' => null,
'extra' => null,
'native' => $serverInfo,
);
}
}
return $serverInfo;
}
/**
* Checks if there's a sequence that exists.
*
* @param string $seq_name The sequence name to verify.
* @return boolean The value if the table exists or not
*/
public function checkSequence($seqName)
{
$query = 'SELECT * FROM ' . $seqName;
try {
$this->exec($query);
} catch(Doctrine_Connection_Exception $e) {
if ($e->getPortableCode() == Doctrine::ERR_NOSUCHTABLE) {
return false;
}
throw $e;
}
return true;
}
}