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<?php
/*
* $Id: Mssql.php 6537 2009-10-19 20:11:24Z guilhermeblanco $
*
* 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.org>.
*/
/**
* Doctrine_Sequence_Mssql
*
* @package Doctrine
* @subpackage Sequence
* @author Konsta Vesterinen <kvesteri@cc.hut.fi>
* @license http://www.opensource.org/licenses/lgpl-license.php LGPL
* @link www.phpdoctrine.org
* @since 1.0
* @version $Revision: 6537 $
*/
class Doctrine_Sequence_Mssql extends Doctrine_Sequence
{
/**
* Returns the next free id of a sequence
*
* @param string $seqName name of the sequence
* @param bool when true missing sequences are automatic created
*
* @return integer next id in the given sequence
*/
public function nextId($seqName, $onDemand = true)
{
$sequenceName = $this->conn->quoteIdentifier($this->conn->formatter->getSequenceName($seqName), true);
$seqcolName = $this->conn->quoteIdentifier($this->conn->getAttribute(Doctrine_Core::ATTR_SEQCOL_NAME), true);
if ($this->checkSequence($sequenceName)) {
$query = 'SET IDENTITY_INSERT ' . $sequenceName . ' OFF '
. 'INSERT INTO ' . $sequenceName . ' DEFAULT VALUES';
} else {
$query = 'INSERT INTO ' . $sequenceName . ' (' . $seqcolName . ') VALUES (0)';
}
try {
$this->conn->exec($query);
} catch(Doctrine_Connection_Exception $e) {
if ($onDemand && $e->getPortableCode() == Doctrine_Core::ERR_NOSUCHTABLE) {
// Since we are creating the sequence on demand
// we know the first id = 1 so initialize the
// sequence at 2
try {
$result = $this->conn->export->createSequence($seqName, 2);
} catch(Doctrine_Exception $e) {
throw new Doctrine_Sequence_Exception('on demand sequence ' . $seqName . ' could not be created');
}
/**
* This could actually be a table that starts at 18.. oh well..
* we will keep the fallback to return 1 in case we skip this.. which
* should really not happen.. otherwise the returned values is biased.
*/
if ($this->checkSequence($seqName)) {
return $this->lastInsertId($seqName);
}
return 1;
}
throw $e;
}
$value = $this->lastInsertId($sequenceName);
if (is_numeric($value)) {
$query = 'DELETE FROM ' . $sequenceName . ' WHERE ' . $seqcolName . ' < ' . $value;
try {
$this->conn->exec($query);
} catch (Doctrine_Connection_Exception $e) {
throw new Doctrine_Sequence_Exception(
'Could not delete previous sequence from ' .
$sequenceName . ' at ' . __FILE__ . ' in ' .
__FUNCTION__ . ' with the message: ' . $e->getMessage()
);
}
}
return $value;
}
/**
* Checks if there's a sequence that exists.
*
* @param string $seqName The sequence name to verify.
* @return bool $tableExists The value if the table exists or not
* @access private
*/
public function checkSequence($seqName)
{
$query = 'SELECT COUNT(1) FROM ' . $seqName;
try {
$this->conn->execute($query);
} catch (Doctrine_Connection_Exception $e) {
if ($e->getPortableCode() == Doctrine_Core::ERR_NOSUCHTABLE) {
return false;
}
}
return true;
}
/**
* Returns the autoincrement ID if supported or $id or fetches the current
* ID in a sequence called: $table.(empty($field) ? '' : '_'.$field)
*
* @param string name of the table into which a new row was inserted
* @param string name of the field into which a new row was inserted
*/
public function lastInsertId($table = null, $field = null)
{
$serverInfo = $this->conn->getServerVersion();
if (is_array($serverInfo)
&& ! is_null($serverInfo['major'])
&& $serverInfo['major'] >= 8) {
$query = 'SELECT SCOPE_IDENTITY()';
} else {
$query = 'SELECT @@IDENTITY';
}
return (string) floor((float) $this->conn->fetchOne($query));
}
/**
* Returns the current id of a sequence
*
* @param string $seqName name of the sequence
*
* @return integer current id in the given sequence
*/
public function currId($seqName)
{
$this->warnings[] = 'database does not support getting current
sequence value, the sequence value was incremented';
return $this->nextId($seqName);
}
}
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