diff --git a/src/baseexpression.h b/src/baseexpression.h
index c94cfee..6f8e343 100644
--- a/src/baseexpression.h
+++ b/src/baseexpression.h
@@ -787,13 +787,17 @@ protected:
 	template<typename FieldValue>
 	void put_field_name_and_value(const wchar_t * field_name, const FieldValue & field_value, void (Model::*getter_method)(pt::Stream &), const FT & field_type, ModelEnv * model_env)
 	{
+		bool allow_to_put_value = (get_output_type() != MORM_OUTPUT_TYPE_WHERE_IS_NULL && get_output_type() != MORM_OUTPUT_TYPE_WHERE_IS_NOT_NULL);
+
 		if( model_env && model_env->set_field_name_helper )
 		{
 			if( (size_t)model_env->field_index < model_env->set_field_name_helper->size() )
 			{
 				put_field_name_and_table_if_needed((*model_env->set_field_name_helper)[model_env->field_index], field_type, model_env);
 				put_name_value_separator();
-				put_field_value_or_null(field_value, getter_method, field_type, model_env);
+
+				if( allow_to_put_value )
+					put_field_value_or_null(field_value, getter_method, field_type, model_env);
 			}
 
 			model_env->field_index += 1;
@@ -802,7 +806,9 @@ protected:
 		{
 			put_field_name_and_table_if_needed(field_name, field_type, model_env);
 			put_name_value_separator();
-			put_field_value_or_null(field_value, getter_method, field_type, model_env);
+
+			if( allow_to_put_value )
+				put_field_value_or_null(field_value, getter_method, field_type, model_env);
 		}
 	}
 
diff --git a/src/dbexpression.cpp b/src/dbexpression.cpp
index d836129..8aa08a7 100644
--- a/src/dbexpression.cpp
+++ b/src/dbexpression.cpp
@@ -109,7 +109,9 @@ void DbExpression::field_before()
 			output_type == MORM_OUTPUT_TYPE_WHERE_NOT_EQ ||
 			output_type == MORM_OUTPUT_TYPE_WHERE_IN ||
 			output_type == MORM_OUTPUT_TYPE_WHERE_LIKE ||
-			output_type == MORM_OUTPUT_TYPE_WHERE_ILIKE )
+			output_type == MORM_OUTPUT_TYPE_WHERE_ILIKE ||
+			output_type == MORM_OUTPUT_TYPE_WHERE_IS_NULL ||
+			output_type == MORM_OUTPUT_TYPE_WHERE_IS_NOT_NULL )
 		{
 			int conjunction = MORM_CONJUNCTION_AND;
 
@@ -181,6 +183,16 @@ void DbExpression::put_name_value_separator()
 	{
 		(*out_stream) << " ILIKE ";
 	}
+	else
+	if( output_type == MORM_OUTPUT_TYPE_WHERE_IS_NULL )
+	{
+		(*out_stream) << " IS NULL ";
+	}
+	else
+	if( output_type == MORM_OUTPUT_TYPE_WHERE_IS_NOT_NULL )
+	{
+		(*out_stream) << " IS NOT NULL ";
+	}
 }
 
 
diff --git a/src/finder.h b/src/finder.h
index 45fb539..c7ccad6 100644
--- a/src/finder.h
+++ b/src/finder.h
@@ -605,6 +605,84 @@ public:
 	}
 
 
+	Finder<ModelClass> & is_null(const wchar_t * field_name)
+	{
+		if( db_expression )
+		{
+			int ignored_value = 0;
+			db_expression->set_output_type(MORM_OUTPUT_TYPE_WHERE_IS_NULL);
+			db_expression->field_to_stream(*out_stream, field_name, ignored_value, FT::default_type, &model_env);
+		}
+
+		return *this;
+	}
+
+
+	Finder<ModelClass> & is_null(const wchar_t * table_name, const wchar_t * field_name)
+	{
+		if( db_expression )
+		{
+			int ignored_value = 0;
+			db_expression->set_output_type(MORM_OUTPUT_TYPE_WHERE_IS_NULL);
+			field_to_stream(table_name, 1, field_name, ignored_value);
+		}
+
+		return *this;
+	}
+
+
+	Finder<ModelClass> & is_null(const wchar_t * table_name, int table_index, const wchar_t * field_name)
+	{
+		if( db_expression )
+		{
+			int ignored_value = 0;
+			db_expression->set_output_type(MORM_OUTPUT_TYPE_WHERE_IS_NULL);
+			field_to_stream(table_name, table_index, field_name, ignored_value);
+		}
+
+		return *this;
+	}
+
+
+	Finder<ModelClass> & is_not_null(const wchar_t * field_name)
+	{
+		if( db_expression )
+		{
+			int ignored_value = 0;
+			db_expression->set_output_type(MORM_OUTPUT_TYPE_WHERE_IS_NOT_NULL);
+			db_expression->field_to_stream(*out_stream, field_name, ignored_value, FT::default_type, &model_env);
+		}
+
+		return *this;
+	}
+
+
+	Finder<ModelClass> & is_not_null(const wchar_t * table_name, const wchar_t * field_name)
+	{
+		if( db_expression )
+		{
+			int ignored_value = 0;
+			db_expression->set_output_type(MORM_OUTPUT_TYPE_WHERE_IS_NOT_NULL);
+			field_to_stream(table_name, 1, field_name, ignored_value);
+		}
+
+		return *this;
+	}
+
+
+	Finder<ModelClass> & is_not_null(const wchar_t * table_name, int table_index, const wchar_t * field_name)
+	{
+		if( db_expression )
+		{
+			int ignored_value = 0;
+			db_expression->set_output_type(MORM_OUTPUT_TYPE_WHERE_IS_NOT_NULL);
+			field_to_stream(table_name, table_index, field_name, ignored_value);
+		}
+
+		return *this;
+	}
+
+
 
 	/*
 	 * page_number start from zero (it's a number of a page, not an offset)
diff --git a/src/morm_types.h b/src/morm_types.h
index bf436a8..5e5482c 100644
--- a/src/morm_types.h
+++ b/src/morm_types.h
@@ -101,8 +101,10 @@
 #define MORM_OUTPUT_TYPE_WHERE_NOT_EQ 26
 #define MORM_OUTPUT_TYPE_WHERE_LIKE 27
 #define MORM_OUTPUT_TYPE_WHERE_ILIKE 28
+#define MORM_OUTPUT_TYPE_WHERE_IS_NULL 29
+#define MORM_OUTPUT_TYPE_WHERE_IS_NOT_NULL 30
 
-#define MORM_OUTPUT_TYPE_FIELDS_RECURSIVE 29
+#define MORM_OUTPUT_TYPE_FIELDS_RECURSIVE 31
 
 #define MORM_CONJUNCTION_AND 1
 #define MORM_CONJUNCTION_OR  2