Merge 9e0cd1a08a into 33fc33b2f5

session_convert.go

@@ -558,6 +558,9 @@ func (session *Session) value2Interface(col *core.Column, fieldValue reflect.Val
 		if col.SQLType.IsBlob() {
 			return data, nil
 		}
+		if nil==data {
+			return nil,nil
+		}		
 		return string(data), nil
 	}
 

statement.go

@@ -329,9 +329,13 @@ func (statement *Statement) buildUpdates(bean interface{},
 			data, err := structConvert.ToDB()
 			if err != nil {
 				engine.logger.Error(err)
+			} else {
+				if nil==data {
+					val=nil
 				}else{
 					val = data
 				}
+			}
 			goto APPEND
 		}