Attendance managing system.
lessonTime:
1 08.30-09.15
2 09.20-10.05
3 10.25-11.10
4 11.15-12.00
5 13.30-14.15
6 14.20-15.05
7 15.25-16.10
8 16.15-17.00
9 17.05-17.50
10 18.30-19.15 (nighty self-study)
11 19.20-20.05
12 20.10-20.55
TableName:keyName:ID
The layer is record to string key-valve pairs realized by keyv.
The layer is the layer which support table-like operation based on ID.
This layer need to convert all kinds of values into string in order to communicate with layer 2.