cached queries need to be reset on schema change because they become invalid

fixes: https://github.com/owncloud/apps/issues/468

diff --git a/lib/db.php b/lib/db.php
index 5224d5ee7da46ebfc4d34cc55690cbb7b9a222ff..7cc65673d101097cc7900c301e1bbccbf2eaa331 100644 (file)
--- a/lib/db.php
+++ b/lib/db.php
@@ -440,6 +440,9 @@ class OC_DB {
                $CONFIG_DBTABLEPREFIX = OC_Config::getValue( "dbtableprefix", "oc_" );
                $CONFIG_DBTYPE = OC_Config::getValue( "dbtype", "sqlite" );
 
+               // cleanup the cached queries
+               self::$preparedQueries = array();
+
                self::connectScheme();
 
                // read file