This project attempts to implement a Database using B+Tree. The project has developed a DATABASE SYSTEM with lesser memory consumption. Its API includes simple SQL Statements and the output is displayed on the screen. Certain applications for which several features of existing databases like concurrency control, transaction management, security features are not enabled. B+Trees can be used as an index for factor access to the data. Help facility is provided to know the syntax of SQL Statements.
基于事件驅動的串口通訊控件
消息幀數據格式:
1 0 A B X X
其中 10 為消息標識,
AB表示文本長度,L=A*100+B
XX為配位字符,任意
控制幀數據格式
0 1 A B M N
其中 01為控制標識,
AB為請求標識
MN為附加標識
11表示請求對方接收文件,M表示描述字串中文件名子串的長度
N表示描述字串中文件大小子串的長度
10通知對方放棄傳輸
00通知文件傳輸完畢
01請求對方發送數據, MN為10請求發送下一個
MN為00請求重發
數據幀數據格式
0 0 A B M N
其中 00 為數據標識,
AB表示數據長度,L=A*100+B
MN為校驗,M*100+N=A+B
