Added a flushStatments() call in the rollback() to fix issue http://code.google.com/p/mybatis/issues/detail?id=122

Author: nmaves

src/main/java/org/apache/ibatis/executor/BaseExecutor.java

@@ -160,6 +160,7 @@ public void commit(boolean required) throws SQLException {
   public void rollback(boolean required) throws SQLException {
     if (!closed) {
       clearLocalCache();
+      flushStatements();
       if (required) {
         transaction.rollback();
       }