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<?php
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/*
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* $Id: Db2.php 7490 2010-03-29 19:53:27Z jwage $
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* This software consists of voluntary contributions made by many individuals
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* and is licensed under the LGPL. For more information, see
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* <http://www.doctrine-project.org>.
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*/
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/**
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* Doctrine_Sequence_Db2
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*
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* @package Doctrine
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* @subpackage Sequence
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* @author Konsta Vesterinen <kvesteri@cc.hut.fi>
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* @license http://www.opensource.org/licenses/lgpl-license.php LGPL
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* @link www.doctrine-project.org
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* @since 1.0
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* @version $Revision: 7490 $
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*/
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class Doctrine_Sequence_Db2 extends Doctrine_Sequence
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{
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/**
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* Returns the next free id of a sequence
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*
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* @param string $seqName name of the sequence
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* @param bool when true missing sequences are automatic created
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*
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* @return integer next id in the given sequence
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* @throws Doctrine_Sequence_Exception
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*/
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public function nextId($seqName, $ondemand = true)
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{
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$sequenceName = $this->conn->quoteIdentifier($this->conn->formatter->getSequenceName($seqName), true);
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$query = 'SELECT NEXTVAL FOR ' . $sequenceName . ' AS VAL FROM SYSIBM.SYSDUMMY1';
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try {
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$result = $this->conn->fetchOne($query);
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$result = ($result) ? $result['VAL'] : null;
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} catch(Doctrine_Connection_Exception $e) {
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if ($onDemand && $e->getPortableCode() == Doctrine_Core::ERR_NOSUCHTABLE) {
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try {
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$result = $this->conn->export->createSequence($seqName);
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} catch(Doctrine_Exception $e) {
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throw new Doctrine_Sequence_Exception('on demand sequence ' . $seqName . ' could not be created');
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}
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return $this->nextId($seqName, false);
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} else {
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throw new Doctrine_Sequence_Exception('sequence ' .$seqName . ' does not exist');
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}
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}
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return $result;
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}
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/**
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* Return the most recent value from the specified sequence in the database.
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* This is supported only on RDBMS brands that support sequences
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* (e.g. Oracle, PostgreSQL, DB2). Other RDBMS brands return null.
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*
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* @param string $sequenceName
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* @return integer
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* @throws Doctrine_Adapter_Db2_Exception
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*/
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public function currId($sequenceName)
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{
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$sql = 'SELECT PREVVAL FOR '
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. $this->quoteIdentifier($this->conn->formatter->getSequenceName($sequenceName))
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. ' AS VAL FROM SYSIBM.SYSDUMMY1';
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$stmt = $this->query($sql);
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$result = $stmt->fetchAll(Doctrine_Core::FETCH_ASSOC);
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if ($result) {
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return $result[0]['VAL'];
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} else {
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return null;
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}
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}
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/**
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* Gets the last ID generated automatically by an IDENTITY/AUTOINCREMENT column.
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*
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* As a convention, on RDBMS brands that support sequences
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* (e.g. Oracle, PostgreSQL, DB2), this method forms the name of a sequence
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* from the arguments and returns the last id generated by that sequence.
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* On RDBMS brands that support IDENTITY/AUTOINCREMENT columns, this method
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* returns the last value generated for such a column, and the table name
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* argument is disregarded.
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*
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* The IDENTITY_VAL_LOCAL() function gives the last generated identity value
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* in the current process, even if it was for a GENERATED column.
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*
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* @param string $tableName OPTIONAL
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* @param string $primaryKey OPTIONAL
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* @return integer
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* @throws Doctrine_Adapter_Db2_Exception
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*/
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public function lastInsertId($tableName = null, $primaryKey = null)
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{
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$this->_connect();
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if ($tableName !== null) {
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$sequenceName = $tableName;
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if ($primaryKey) {
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$sequenceName .= "_$primaryKey";
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}
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$sequenceName .= '_seq';
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return $this->lastSequenceId($sequenceName);
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}
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$sql = 'SELECT IDENTITY_VAL_LOCAL() AS VAL FROM SYSIBM.SYSDUMMY1';
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$stmt = $this->query($sql);
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$result = $stmt->fetchAll(Doctrine_Core::FETCH_ASSOC);
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if ($result) {
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return $result[0]['VAL'];
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} else {
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return null;
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}
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}
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}
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