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/firebird.php

@@ -28,6 +28,9 @@ class dbal_firebird extends dbal
 	var $last_query_text = '';
 	var $service_handle = false;
 
+	// can't truncate a table
+	var $truncate = false;
+
 	/**
 	* Connect to server
 	*/
@@ -376,6 +379,20 @@ class dbal_firebird extends dbal
 		return str_replace("'", "''", $msg);
 	}
 
+	/**
+	* Expose a DBMS specific function
+	*/
+	function sql_function($type, $col)
+	{
+		switch ($type)
+		{
+			case 'length_varchar':
+			case 'length_text':
+				return 'OCTET_LENGTH(' . $col . ')';
+			break;
+		}
+	}
+
 	/**
 	* Build LIKE expression
 	* @access private