From c4ff57c75f3d840347f140e35fda74ee5ea84bc0 Mon Sep 17 00:00:00 2001
From: Aleksander Machniak <alec@alec.pl>
Date: Mon, 11 Mar 2013 03:39:30 -0400
Subject: [PATCH] Fix LIMIT/OFFSET queries handling on MS SQL Server (#1488984) - require version 2005+
---
program/lib/Roundcube/rcube_db_mssql.php | 32 ++++++++++++++++++--------------
1 files changed, 18 insertions(+), 14 deletions(-)
diff --git a/program/lib/Roundcube/rcube_db_mssql.php b/program/lib/Roundcube/rcube_db_mssql.php
index 84fe22b..37a4267 100644
--- a/program/lib/Roundcube/rcube_db_mssql.php
+++ b/program/lib/Roundcube/rcube_db_mssql.php
@@ -100,25 +100,29 @@
{
$limit = intval($limit);
$offset = intval($offset);
+ $end = $offset + $limit;
+
+ // query without OFFSET
+ if (!$offset) {
+ $query = preg_replace('/^SELECT\s/i', "SELECT TOP $limit ", $query);
+ return $query;
+ }
$orderby = stristr($query, 'ORDER BY');
+ $offset += 1;
+
if ($orderby !== false) {
- $sort = (stripos($orderby, ' desc') !== false) ? 'desc' : 'asc';
- $order = str_ireplace('ORDER BY', '', $orderby);
- $order = trim(preg_replace('/\bASC\b|\bDESC\b/i', '', $order));
+ $query = trim(substr($query, 0, -1 * strlen($orderby)));
+ }
+ else {
+ // it shouldn't happen, paging without sorting has not much sense
+ // @FIXME: I don't know how to build paging query without ORDER BY
+ $orderby = "ORDER BY 1";
}
- $query = preg_replace('/^SELECT\s/i', 'SELECT TOP ' . ($limit + $offset) . ' ', $query);
-
- $query = 'SELECT * FROM (SELECT TOP ' . $limit . ' * FROM (' . $query . ') AS inner_tbl';
- if ($orderby !== false) {
- $query .= ' ORDER BY ' . $order . ' ';
- $query .= (stripos($sort, 'asc') !== false) ? 'DESC' : 'ASC';
- }
- $query .= ') AS outer_tbl';
- if ($orderby !== false) {
- $query .= ' ORDER BY ' . $order . ' ' . $sort;
- }
+ $query = preg_replace('/^SELECT\s/i', '', $query);
+ $query = "WITH paging AS (SELECT ROW_NUMBER() OVER ($orderby) AS [RowNumber], $query)"
+ . " SELECT * FROM paging WHERE [RowNumber] BETWEEN $offset AND $end ORDER BY [RowNumber]";
return $query;
}
--
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