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libraries/joomla/database/query/mysqli.php

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+<?php
+/**
+ * @package     Joomla.Platform
+ * @subpackage  Database
+ *
+ * @copyright   Copyright (C) 2005 - 2013 Open Source Matters, Inc. All rights reserved.
+ * @license     GNU General Public License version 2 or later; see LICENSE
+ */
+
+defined('JPATH_PLATFORM') or die;
+
+/**
+ * Query Building Class.
+ *
+ * @package     Joomla.Platform
+ * @subpackage  Database
+ * @since       11.1
+ */
+class JDatabaseQueryMysqli extends JDatabaseQuery implements JDatabaseQueryLimitable
+{
+	/**
+	 * @var    interger  The offset for the result set.
+	 * @since  12.1
+	 */
+	protected $offset;
+
+	/**
+	 * @var    integer  The limit for the result set.
+	 * @since  12.1
+	 */
+	protected $limit;
+
+	/**
+	 * Method to modify a query already in string format with the needed
+	 * additions to make the query limited to a particular number of
+	 * results, or start at a particular offset.
+	 *
+	 * @param   string   $query   The query in string format
+	 * @param   integer  $limit   The limit for the result set
+	 * @param   integer  $offset  The offset for the result set
+	 *
+	 * @return string
+	 *
+	 * @since 12.1
+	 */
+	public function processLimit($query, $limit, $offset = 0)
+	{
+		if ($limit > 0 || $offset > 0)
+		{
+			$query .= ' LIMIT ' . $offset . ', ' . $limit;
+		}
+
+		return $query;
+	}
+
+	/**
+	 * Concatenates an array of column names or values.
+	 *
+	 * @param   array   $values     An array of values to concatenate.
+	 * @param   string  $separator  As separator to place between each value.
+	 *
+	 * @return  string  The concatenated values.
+	 *
+	 * @since   11.1
+	 */
+	public function concatenate($values, $separator = null)
+	{
+		if ($separator)
+		{
+			$concat_string = 'CONCAT_WS(' . $this->quote($separator);
+
+			foreach ($values as $value)
+			{
+				$concat_string .= ', ' . $value;
+			}
+
+			return $concat_string . ')';
+		}
+		else
+		{
+			return 'CONCAT(' . implode(',', $values) . ')';
+		}
+	}
+
+	/**
+	 * Sets the offset and limit for the result set, if the database driver supports it.
+	 *
+	 * Usage:
+	 * $query->setLimit(100, 0); (retrieve 100 rows, starting at first record)
+	 * $query->setLimit(50, 50); (retrieve 50 rows, starting at 50th record)
+	 *
+	 * @param   integer  $limit   The limit for the result set
+	 * @param   integer  $offset  The offset for the result set
+	 *
+	 * @return  JDatabaseQuery  Returns this object to allow chaining.
+	 *
+	 * @since   12.1
+	 */
+	public function setLimit($limit = 0, $offset = 0)
+	{
+		$this->limit  = (int) $limit;
+		$this->offset = (int) $offset;
+
+		return $this;
+	}
+}