From 30d9af4789fafdf766ea2c3eb0eafa0b4bfea312 Mon Sep 17 00:00:00 2001
From: Martyn Dale <martyn@proboards.com>
Date: Thu, 21 Nov 2013 13:00:43 -0500
Subject: [PATCH] Fix performance issue with many databases (when only_db is
 defined)

---
 libraries/navigation/Nodes/Node.class.php | 29 ++++++++++++++++++-----
 1 file changed, 23 insertions(+), 6 deletions(-)

diff --git a/libraries/navigation/Nodes/Node.class.php b/libraries/navigation/Nodes/Node.class.php
index a0f349773e..dad71bf8a8 100644
--- a/libraries/navigation/Nodes/Node.class.php
+++ b/libraries/navigation/Nodes/Node.class.php
@@ -359,12 +359,29 @@ class Node
      */
     public function getData($type, $pos, $searchClause = '')
     {
-        $query  = "SELECT `SCHEMA_NAME` ";
-        $query .= "FROM `INFORMATION_SCHEMA`.`SCHEMATA` ";
-        $query .= $this->_getWhereClause($searchClause);
-        $query .= "ORDER BY `SCHEMA_NAME` ASC ";
-        $query .= "LIMIT $pos, {$GLOBALS['cfg']['MaxNavigationItems']}";
-        return $GLOBALS['dbi']->fetchResult($query);
+        if ($type == 'databases' 
+            && ! empty($GLOBALS['cfg']['Server']['only_db'])
+        ) {
+            $db_list = $GLOBALS['cfg']['Server']['only_db'];
+            $query = "SELECT * FROM ( SELECT '";
+
+            if (is_string($db_list)) {
+                $db_list = array($db_list);
+            }
+
+            if (count($db_list)) {
+                $query .= implode("' UNION ALL SELECT '", $db_list);
+                $query .= "' ";
+            }
+            return $GLOBALS['dbi']->fetchResult($query . ") as alias");
+        } else {
+            $query  = "SELECT `SCHEMA_NAME` ";
+            $query .= "FROM `INFORMATION_SCHEMA`.`SCHEMATA` ";
+            $query .= $this->_getWhereClause($searchClause);
+            $query .= "ORDER BY `SCHEMA_NAME` ASC ";
+            $query .= "LIMIT $pos, {$GLOBALS['cfg']['MaxNavigationItems']}";
+            return $GLOBALS['dbi']->fetchResult($query);
+        }
     }
 
     /**