Update QueryGroup.java

Author: JWaldecker

src/main/java/org/javawebstack/orm/query/QueryGroup.java

@@ -79,6 +79,14 @@ public QueryGroup<T> isNull(Object left) {
     public QueryGroup<T> notNull(Object left) {
         return where(left, "IS NOT NULL", null);
     }
+    
+    public QueryGroup<T> whereNull(Object left) {
+        return where(left, "IS NULL", null);
+    }
+    
+    public QueryGroup<T> whereNotNull(Object left) {
+        return where(left, "IS NOT NULL", null);
+    }
 
     public QueryGroup<T> lessThan(Object left, Object right) {
         return where(left, "<", right);