Ch-ch-ch-changes

- Made us more DB independent by making many queries capability based instead of DB specific
- Finished PHP5ifying of the acm_file class, now with some (hopefully) enhancements to its performance
- Sped up viewforum considerably (also goes towards mcp_forum)

I really hope I didn't explode CVS...


git-svn-id: file:///svn/phpbb/trunk@8301 89ea8834-ac86-4346-8a33-228a782c2dd0

phpBB/includes/db/mysqli.php

@@ -28,6 +28,9 @@ class dbal_mysqli extends dbal
 {
 	var $multi_insert = true;
 
+	// Supports multiple table deletion
+	var $multi_table_deletion = false;
+
 	/**
 	* Connect to server
 	*/
@@ -270,6 +273,20 @@ class dbal_mysqli extends dbal
 		return @mysqli_real_escape_string($this->db_connect_id, $msg);
 	}
 
+	/**
+	* Expose a DBMS specific function
+	*/
+	function sql_function($type, $col)
+	{
+		switch ($type)
+		{
+			case 'length_varchar':
+			case 'length_text':
+				return 'LENGTH(' . $col . ')';
+			break;
+		}
+	}
+
 	/**
 	* Build LIKE expression
 	* @access private