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<?php
/*
* $Id: Db2.php 6712 2009-11-12 18:26:29Z jwage $
*
* 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_Db2
*
* @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: 6712 $
*/
class Doctrine_Sequence_Db2 extends Doctrine_Sequence
{
/**
* Returns the next free id of a sequence
*
* @param string $seqName name of the sequence
* @param bool when true missing sequences are automatic created
*
* @return integer next id in the given sequence
* @throws Doctrine_Sequence_Exception
*/
public function nextId($seqName, $ondemand = true)
{
$sequenceName = $this->conn->quoteIdentifier($this->conn->formatter->getSequenceName($seqName), true);
$query = 'SELECT NEXTVAL FOR ' . $sequenceName . ' AS VAL FROM SYSIBM.SYSDUMMY1';
try {
$result = $this->conn->fetchOne($query);
$result = ($result) ? $result['VAL'] : null;
} catch(Doctrine_Connection_Exception $e) {
if ($onDemand && $e->getPortableCode() == Doctrine_Core::ERR_NOSUCHTABLE) {
try {
$result = $this->conn->export->createSequence($seqName);
} catch(Doctrine_Exception $e) {
throw new Doctrine_Sequence_Exception('on demand sequence ' . $seqName . ' could not be created');
}
return $this->nextId($seqName, false);
} else {
throw new Doctrine_Sequence_Exception('sequence ' .$seqName . ' does not exist');
}
}
return $result;
}
/**
* Return the most recent value from the specified sequence in the database.
* This is supported only on RDBMS brands that support sequences
* (e.g. Oracle, PostgreSQL, DB2). Other RDBMS brands return null.
*
* @param string $sequenceName
* @return integer
* @throws Doctrine_Adapter_Db2_Exception
*/
public function currId($sequenceName)
{
$sql = 'SELECT PREVVAL FOR '
. $this->quoteIdentifier($this->conn->formatter->getSequenceName($sequenceName))
. ' AS VAL FROM SYSIBM.SYSDUMMY1';
$stmt = $this->query($sql);
$result = $stmt->fetchAll(Doctrine_Core::FETCH_ASSOC);
if ($result) {
return $result[0]['VAL'];
} else {
return null;
}
}
/**
* Gets the last ID generated automatically by an IDENTITY/AUTOINCREMENT column.
*
* As a convention, on RDBMS brands that support sequences
* (e.g. Oracle, PostgreSQL, DB2), this method forms the name of a sequence
* from the arguments and returns the last id generated by that sequence.
* On RDBMS brands that support IDENTITY/AUTOINCREMENT columns, this method
* returns the last value generated for such a column, and the table name
* argument is disregarded.
*
* The IDENTITY_VAL_LOCAL() function gives the last generated identity value
* in the current process, even if it was for a GENERATED column.
*
* @param string $tableName OPTIONAL
* @param string $primaryKey OPTIONAL
* @return integer
* @throws Doctrine_Adapter_Db2_Exception
*/
public function lastInsertId($tableName = null, $primaryKey = null)
{
$this->_connect();
if ($tableName !== null) {
$sequenceName = $tableName;
if ($primaryKey) {
$sequenceName .= "_$primaryKey";
}
$sequenceName .= '_seq';
return $this->lastSequenceId($sequenceName);
}
$sql = 'SELECT IDENTITY_VAL_LOCAL() AS VAL FROM SYSIBM.SYSDUMMY1';
$stmt = $this->query($sql);
$result = $stmt->fetchAll(Doctrine_Core::FETCH_ASSOC);
if ($result) {
return $result[0]['VAL'];
} else {
return null;
}
}
}
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