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diff --git a/vendor/doctrine/orm/lib/Doctrine/ORM/Id/SequenceGenerator.php b/vendor/doctrine/orm/lib/Doctrine/ORM/Id/SequenceGenerator.php
new file mode 100644
index 0000000..5b5d831
--- /dev/null
+++ b/vendor/doctrine/orm/lib/Doctrine/ORM/Id/SequenceGenerator.php
@@ -0,0 +1,106 @@
+<?php
+/*
+ * 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 MIT license. For more information, see
+ * <http://www.doctrine-project.org>.
+ */
+
+namespace Doctrine\ORM\Id;
+
+use Serializable, Doctrine\ORM\EntityManager;
+
+/**
+ * Represents an ID generator that uses a database sequence.
+ *
+ * @since 2.0
+ * @author Roman Borschel <roman@code-factory.org>
+ */
+class SequenceGenerator extends AbstractIdGenerator implements Serializable
+{
+    private $_allocationSize;
+    private $_sequenceName;
+    private $_nextValue = 0;
+    private $_maxValue = null;
+
+    /**
+     * Initializes a new sequence generator.
+     *
+     * @param \Doctrine\ORM\EntityManager $em The EntityManager to use.
+     * @param string $sequenceName The name of the sequence.
+     * @param integer $allocationSize The allocation size of the sequence.
+     */
+    public function __construct($sequenceName, $allocationSize)
+    {
+        $this->_sequenceName = $sequenceName;
+        $this->_allocationSize = $allocationSize;
+    }
+
+    /**
+     * Generates an ID for the given entity.
+     *
+     * @param object $entity
+     * @return integer|float The generated value.
+     * @override
+     */
+    public function generate(EntityManager $em, $entity)
+    {
+        if ($this->_maxValue === null || $this->_nextValue == $this->_maxValue) {
+            // Allocate new values
+            $conn = $em->getConnection();
+            $sql  = $conn->getDatabasePlatform()->getSequenceNextValSQL($this->_sequenceName);
+
+            $this->_nextValue = (int)$conn->fetchColumn($sql);
+            $this->_maxValue  = $this->_nextValue + $this->_allocationSize;
+        }
+
+        return $this->_nextValue++;
+    }
+
+    /**
+     * Gets the maximum value of the currently allocated bag of values.
+     *
+     * @return integer|float
+     */
+    public function getCurrentMaxValue()
+    {
+        return $this->_maxValue;
+    }
+
+    /**
+     * Gets the next value that will be returned by generate().
+     *
+     * @return integer|float
+     */
+    public function getNextValue()
+    {
+        return $this->_nextValue;
+    }
+
+    public function serialize()
+    {
+        return serialize(array(
+            'allocationSize' => $this->_allocationSize,
+            'sequenceName'   => $this->_sequenceName
+        ));
+    }
+
+    public function unserialize($serialized)
+    {
+        $array = unserialize($serialized);
+
+        $this->_sequenceName = $array['sequenceName'];
+        $this->_allocationSize = $array['allocationSize'];
+    }
+}