Added fix for where("x", null) to internally call whereNull instead

Author: JanHolger

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

@@ -38,8 +38,10 @@ public QueryGroup<T> or(Function<QueryGroup<T>, QueryGroup<T>> group) {
     }
 
     public QueryGroup<T> where(Object left, String condition, Object right) {
-        if(right == null)
+        if(condition.equalsIgnoreCase("=") && right == null)
             return whereNull(left);
+        if(condition.equalsIgnoreCase("!=") && right == null)
+            return whereNotNull(left);
         if (queryElements.size() > 0)
             queryElements.add(QueryConjunction.AND);
         queryElements.add(new QueryCondition(left instanceof String ? new QueryColumn((String) left) : left, condition, right));
@@ -99,8 +101,10 @@ public QueryGroup<T> greaterThan(Object left, Object right) {
     }
 
     public QueryGroup<T> orWhere(Object left, String condition, Object right) {
-        if(right == null)
+        if(condition.equalsIgnoreCase("=") && right == null)
             return orIsNull(left);
+        if(condition.equalsIgnoreCase("!=") && right == null)
+            return orNotNull(left);
         if (queryElements.size() > 0)
             queryElements.add(QueryConjunction.OR);
         queryElements.add(new QueryCondition(left instanceof String ? new QueryColumn((String) left) : left, condition, right));