New database layer based on PHP PDO

1 files changed, 135 insertions, 0 deletions

diff --git a/program/include/rcube_db_mssql.php b/program/include/rcube_db_mssql.php
new file mode 100644
index 000000000..1f7328c3e
--- /dev/null
+++ b/program/include/rcube_db_mssql.php
@@ -0,0 +1,135 @@
+<?php
+
+/*
+ +-----------------------------------------------------------------------+
+ | program/include/rcube_db_mssql.php                                    |
+ |                                                                       |
+ | This file is part of the Roundcube Webmail client                     |
+ | Copyright (C) 2005-2012, The Roundcube Dev Team                       |
+ |                                                                       |
+ | Licensed under the GNU General Public License version 3 or            |
+ | any later version with exceptions for skins & plugins.                |
+ | See the README file for a full license statement.                     |
+ |                                                                       |
+ | PURPOSE:                                                              |
+ |   Database wrapper class that implements PHP PDO functions            |
+ |   for MS SQL Server database                                          |
+ |                                                                       |
+ +-----------------------------------------------------------------------+
+ | Author: Aleksander Machniak <alec@alec.pl>                            |
+ +-----------------------------------------------------------------------+
+*/
+
+
+/**
+ * Database independent query interface
+ *
+ * This is a wrapper for the PHP PDO
+ *
+ * @package    Database
+ * @version    1.0
+ */
+class rcube_db_mssql extends rcube_db
+{
+    protected function init()
+    {
+        $this->options['identifier_start'] = '[';
+        $this->options['identifier_end'] = ']';
+    }
+
+    protected function set_charset($charset)
+    {
+    }
+
+
+    /**
+     * Return SQL function for current time and date
+     *
+     * @return string SQL function to use in query
+     */
+    public function now()
+    {
+        return "getdate()";
+    }
+
+
+    /**
+     * Return SQL statement to convert a field value into a unix timestamp
+     *
+     * This method is deprecated and should not be used anymore due to limitations
+     * of timestamp functions in Mysql (year 2038 problem)
+     *
+     * @param  string $field Field name
+     *
+     * @return string  SQL statement to use in query
+     * @deprecated
+     */
+    public function unixtimestamp($field)
+    {
+        return "DATEDIFF(second, '19700101', $field) + DATEDIFF(second, GETDATE(), GETUTCDATE())";
+    }
+
+
+    /**
+     * Abstract SQL statement for value concatenation
+     *
+     * @return string SQL statement to be used in query
+     */
+    public function concat(/* col1, col2, ... */)
+    {
+        $args = func_get_args();
+
+        if (is_array($args[0])) {
+            $args = $args[0];
+        }
+
+        return '(' . join('+', $args) . ')';
+    }
+
+
+    /**
+     * Adds TOP (LIMIT,OFFSET) clause to the query
+     *
+     */
+    protected function set_limit($query, $limit = 0, $offset = 0)
+    {
+        // code from MDB2 package
+        if ($limit > 0) {
+            $fetch = $offset + $limit;
+            return preg_replace('/^([\s(])*SELECT( DISTINCT)?(?!\s*TOP\s*\()/i',
+                "\\1SELECT\\2 TOP $fetch", $query);
+        }
+
+// @TODO: proper OFFSET handling i _fetch_row()
+
+        return $query;
+    }
+
+
+    /**
+     * Returns PDO DSN string from DSN array (parse_dsn() result)
+     */
+    protected function dsn_string($dsn)
+    {
+        $params = array();
+        $result = $dsn['phptype'] . ':';
+
+        if ($dsn['hostspec']) {
+            $host = $dsn['hostspec'];
+            if ($dsn['port']) {
+                $host .= ',' . $dsn['port'];
+            }
+            $params[] = 'host=' . $host;
+        }
+
+        if ($dsn['database']) {
+            $params[] = 'dbname=' . $dsn['database'];
+        }
+
+        if (!empty($params)) {
+            $result .= implode(';', $params);
+        }
+
+        return $result;
+    }
+}