From bc602d8b8e125597bfd557949e846ff5a258b858 Mon Sep 17 00:00:00 2001
From: Andrey Andreev <narf@bofh.bg>
Date: Thu, 24 May 2012 19:42:16 +0300
Subject: Fix issue #1387

---
 system/database/DB_active_rec.php |  4 ++--
 system/database/DB_driver.php     | 22 ++++++++++++----------
 user_guide/changelog.html         |  4 ++--
 3 files changed, 16 insertions(+), 14 deletions(-)

diff --git a/system/database/DB_active_rec.php b/system/database/DB_active_rec.php
index 841ede28e..10febb1fc 100644
--- a/system/database/DB_active_rec.php
+++ b/system/database/DB_active_rec.php
@@ -255,7 +255,7 @@ class CI_DB_active_record extends CI_DB_driver {
 	 */
 	public function from($from)
 	{
-		foreach ((array)$from as $val)
+		foreach ((array) $from as $val)
 		{
 			if (strpos($val, ',') !== FALSE)
 			{
@@ -1647,7 +1647,7 @@ class CI_DB_active_record extends CI_DB_driver {
 		if (strpos($table, " ") !== FALSE)
 		{
 			// if the alias is written with the AS keyword, remove it
-			$table = preg_replace('/ AS /i', ' ', $table);
+			$table = preg_replace('/\s+AS\s+/i', ' ', $table);
 
 			// Grab the alias
 			$table = trim(strrchr($table, " "));
diff --git a/system/database/DB_driver.php b/system/database/DB_driver.php
index 6161f149b..c25752824 100644
--- a/system/database/DB_driver.php
+++ b/system/database/DB_driver.php
@@ -1263,15 +1263,20 @@ class CI_DB_driver {
 		}
 
 		// Convert tabs or multiple spaces into single spaces
-		$item = preg_replace('/[\t ]+/', ' ', $item);
+		$item = preg_replace('/\s+/', ' ', $item);
 
 		// If the item has an alias declaration we remove it and set it aside.
 		// Basically we remove everything to the right of the first space
-		$alias = '';
-		if (strpos($item, ' ') !== FALSE)
+		if (preg_match('/^([^\s]+) (AS )*(.+)$/i', $item, $matches))
 		{
-			$alias = strstr($item, " ");
-			$item = substr($item, 0, - strlen($alias));
+			$item = $matches[1];
+
+			// Escape the alias
+			$alias = ' '.$matches[2].$this->escape_identifiers($matches[3]);
+		}
+		else
+		{
+			$alias = '';
 		}
 
 		// This is basically a bug fix for queries that use MAX, MIN, etc.
@@ -1387,7 +1392,7 @@ class CI_DB_driver {
 
 		return $item.$alias;
 	}
-	
+
 	// --------------------------------------------------------------------
 
 	/**
@@ -1395,16 +1400,13 @@ class CI_DB_driver {
 	 *
 	 * This function is used extensively by every db driver.
 	 *
-	 * @access	private
 	 * @return	void
 	 */
 	protected function _reset_select()
 	{
-	
 	}
 
 }
 
-
 /* End of file DB_driver.php */
-/* Location: ./system/database/DB_driver.php */
+/* Location: ./system/database/DB_driver.php */
\ No newline at end of file
diff --git a/user_guide/changelog.html b/user_guide/changelog.html
index e0139775a..266ae8652 100644
--- a/user_guide/changelog.html
+++ b/user_guide/changelog.html
@@ -80,7 +80,6 @@ Change Log
 
 <h3>Bug fixes for 2.1.1</h3>
 <ul>
-	<li>Fixed a bug (#1059) - CI_Image_lib::clear() was not correctly clearing all necessary object properties, namely width and height.</li>
 	<li>Fixed a bug (#697) - A wrong array key was used in the Upload library to check for mime-types.</li>
 	<li>Fixed a bug - form_open() compared $action against site_url() instead of base_url()</li>
 	<li>Fixed a bug - CI_Upload::_file_mime_type() could've failed if mime_content_type() is used for the detection and returns FALSE.</li>
@@ -88,8 +87,9 @@ Change Log
 	<li>Fixed a bug - When database caching was enabled, $this->db->query() checked the cache before binding variables which resulted in cached queries never being found.</li>
 	<li>Fixed a bug - CSRF cookie value was allowed to be any (non-empty) string before being written to the output, making code injection a risk.</li>
 	<li>Fixed a bug (#726) - PDO put a 'dbname' argument in it's connection string regardless of the database platform in use, which made it impossible to use SQLite.</li>
-	<li>Fixed a bug - CI_DB_pdo_driver::affect_row was not being initialized properly with SELECT queries, cause it was relying on PDOStatement::rowCount().</li>
 	<li>Fixed a bug - CI_DB_pdo_result::num_rows() was not returning properly value with SELECT queries, cause it was relying on PDOStatement::rowCount().</li>
+	<li>Fixed a bug (#1059) - CI_Image_lib::clear() was not correctly clearing all necessary object properties, namely width and height.</li>
+	<li>Fixed a bug (#1387) - Active Record's <samp>from()</samp> method didn't escape table aliases.</li>
 </ul>
 
 
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