diff -r 25c1ff79297c -r 4fce579bed22 include/relpipe/writer/RelationalWriter.h
--- a/include/relpipe/writer/RelationalWriter.h	Sat Apr 23 21:09:24 2022 +0200
+++ b/include/relpipe/writer/RelationalWriter.h	Sat Apr 23 23:23:29 2022 +0200
@@ -25,6 +25,7 @@
 #include "typedefs.h"
 #include "TypeId.h"
 #include "AttributeMetadata.h"
+#include "BufferingMode.h"
 
 namespace relpipe {
 namespace writer {
@@ -71,6 +72,13 @@
 	 */
 	virtual void writeAttribute(const void* value, const std::type_info& type) = 0;
 
+
+	/**
+	 * @param mode buffering mode to be set
+	 * @param envDefault if mode is ENVIRONMENT but given environmental variable is not set, this defaul is used
+	 */
+	virtual void setBufferingMode(BufferingMode mode, BufferingMode envDefault = BufferingMode::AUTO) = 0;
+
 };
 
 }