fixed various bugs in the sql natives and manager

added a basic test plugin

--HG--
extra : convert_revision : svn%3A39bc706e-5318-0410-9160-8a85361fbb7c/trunk%40875

plugins/include/dbi.inc

@@ -260,10 +260,20 @@ native bool:SQL_HasResultSet(Handle:query);
  * Retrieves the number of rows in the last result set.
  * 
  * @param query			A query (or statement) Handle.
+ * @return				Number of rows in the current result set.
  * @error				Invalid query Handle.
  */
 native SQL_GetRowCount(Handle:query);
 
+/**
+ * Retrieves the number of fields in the last result set.
+ * 
+ * @param query			A query (or statement) Handle.
+ * @return				Number of fields in the current result set.
+ * @error				Invalid query Handle.
+ */
+native SQL_GetFieldCount(Handle:query);
+
 /**
  * Retrieves the name of a field by index.
  *