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本文一方面以实例的形式介绍产生数据封锁的各类情况，另一方面从数据库理论的角度加以分析，以期使读者既知其然，更知其所以然，使读者能够更加深入地理解Oracle的数据封锁机制，而不是简单地记住某些结论。-In this paper, on the one hand, to produce the form of examples of the types of data on the situation of the blockade, on the other hand, the theoretical point of view from the database to be analyzed in order to make the reader not only know-and know所以然, so that readers can be more in-depth understanding of Oracle data blockade mechanism, rather than simply to remember some of the conclusions.

里面有很多有用的公式，很有利于算法的学习，希望与大家一起分享-There are many useful formula for the learning algorithm

SQL 语句帮助文件-SQL sentence help document

电子白板代码（JAVA)-Whiteboard code (Java)

数据结构的课后练习-Data structure of the after-school practice

设计邻接表类,实现无向图的深度优先非递归遍历,无向图的广度优先遍历,并设计主函数输入数据进行测试-Design category adjacency list, realize undirected graph of the depth-first traversal non-recursive, non-directed graph breadth-first traversal, and the design of the main function of the input data for testing

Java写的TDS协议(JDBC/ODBC)实现-Java to write the TDS protocol (JDBC/ODBC) to achieve

索引文件操作（数据结构）-index file operations (data structures)

数据结构第三章中栈和队列的源程序，实现了全部算法-this is a code of data structure

一个关于供求陪送的线路程序。里面用到了最短路径的知识，给初学者参考-one of the lines of supply and demand escort procedures. They use the shortest path of knowledge, reference to beginners