Optimize Row Limiting Clause in Oracle Database 12c doctrine#2649

lib/Doctrine/DBAL/Platforms/Oracle12c1Platform.php

@@ -0,0 +1,50 @@
+<?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\DBAL\Platforms;
+
+/**
+ * Oracle12c1Platform.
+ */
+class Oracle12c1Platform extends OraclePlatform
+{
+
+    /**
+     * {@inheritDoc}
+     */
+    protected function doModifyLimitQuery($query, $limit, $offset = null)
+    {
+        if ($limit === null) {
+            return $query;
+        }
+        $limit = (int)$limit;
+        $offset = (int)$offset;
+
+        if (preg_match('/^\s*SELECT/i', $query)) {
+            if (!preg_match('/\sFROM\s/i', $query)) {
+                $query .= ' FROM dual';
+            }
+            if ($limit > 0) {
+                $query .= ' OFFSET ' . $offset . ' ROWS FETCH NEXT ' . $limit . ' ROWS ONLY';
+            }
+        }
+
+        return $query;
+    }
+}