added support for hex strings and binary strings

added FT::hexadecimal, FT::binary and FT::dont_use_utf8

src/dbexpression.h

@@ -81,18 +81,15 @@ protected:
 	int output_type;
 	std::vector<int> conjunctions;
 
-
 	bool can_field_be_generated(FT field_type);
-
 	void field_before();
-
 	void put_name_value_separator();
 
 
 private:
 
-	void before_field_value_string();
-	void after_field_value_string();
+	void before_field_value_string(FT field_type);
+	void after_field_value_string(FT field_type);
 
 
 };