SQLite中如何用API操作BLOB类型的字段

能对数据库进行维护，包括内容和结构 但是数据库中的表要求有主键 且是自动增长字段-Able to carry out maintenance on the database, including the content and structure of the table but the database requires the primary key and is auto-growth fields

数据结构 课件 东软内部资料！！ 给需要的人-Neusoft courseware data structure internal information! ! To those who need it

UTE - (U)niversal ASP (T)able (E)ditor 万能数据管理（管理后台）-oldest- (U) niversal ASP (T) able (E) Editor omnipotent data management (management background)

假设一个文件中出现了8种符号S0，SQ，S2，S3，S4，S5，S6，S7，那么每种符号要编码，至少需要3bit。假设编码成000，001， 010，011，100，101，110，111。那么符号序列S0S1S7S0S1S6S2S2S3S4S5S0S0S1编码后变成 000001111000001110010010011100101000000001，共用了42bit。我们发现S0，S1，S2这3个符号出现的频率比较大，其它符号出现的频率比较小，我们采用这样的编码方案：S0到S7的码辽分别01，11，101，0000，0001，0010，0011， 100，那么上述符号序列变成011110001110011101101000000010010010111，共用了39bit。尽管有些码字如 S3，S4，S5，S6变长了(由3位变成4位)，但使用频繁的几个码字如S0，S1变短了，所以实现了压缩。对于上述的编码可能导致解码出现非单值性：比如说，如果S0的码字为01，S2的码字为011，那么当序列中出现011时，你不知道是S0的码字后面跟了个1，还是完整的一个S2的码字。因此，编码必须保证较短的编码决不能是较长编码的前缀。符合这种要求的编码称之为前缀编码。要构造符合这样的二进制编码体系，可以通过二叉树来实现。-Suppose a file appears in eight kinds of symbols S0, SQ, S2, S3, S4, S5, S6, S7, then each symbol to be encoded, at least 3bit. Suppose encoding 000,001, 010,011,100,101,110,111. Then the symbolic sequence S0S1S7S0S1S6S2S2S3S4S5S0S0S1 encoded into 000001111000001110010010011100101000000001, sharing a 42bit. We found that S0, S1, S2 these three symbols the frequency of relatively large, the other symbols the frequency is relatively smal

静态sql详细介绍了数据库结构数据库相关的内容，重点介绍和解释了sql语言的使用-Static sql database structure described in detail the contents of the database-related, focusing on and explain the use of language sql

员工培训管理系统。本系统要完成的主要功能是：1.进入系统钱需要身份验证，用户名，密码。输入争取后方可进入。2.管理员可以根据需要定义员工，工作以及部门信息。3.管理员可以定义课程、书籍、教授以及培训的资源信息。4.管理员可以保存员工的培训成绩及员工经过培训之后对该课程和领域的评价。5.依据不同的要求，可以在数据库中对信息进行查询和编辑。-Staff training management system. To complete the system are the main functions: 1. Necessary money into the system authentication, user name, password. Before it can enter into the fight. 2. The administrator can be the definition of necessary staff, as well as the information department. 3. The administrator can define the curriculum, books, professor of information and training resources. 4. The administrator can save the training of its staff after a score and staff training in the areas of curriculum and assessment. 5. In accordance with different requirements, you can on the information in the database query and editing.

操作Ado，得到数据信息，包括表信息、字段信息-Get Database infomation , about Table or Fields.

哈夫曼树算法 根据给定的n个权值{w1,w2,……wn}，构造n棵只有根结点的二叉树，令起权值为wj 在森林中选取两棵根结点权值最小的树作左右子树，构造一棵新的二叉树，置新二叉树根结点权值为其左右子树根结点权值之和 在森林中删除这两棵树，同时将新得到的二叉树加入森林中 重复上述两步，直到只含一棵树为止，这棵树即哈夫曼树 -Huffman tree algorithm based on a given n-weights (w1, w2, ... ... wn), construct n trees only a root node of the tree, so that from the right value of wj in the forest root node to select two the right tree for the value of the smallest subtree around, a new binary tree structure, the right to buy a new tree root node value of its subtree root node around the right value in the forest and delete these two trees, At the same time, the new binary tree obtained by adding the forest to repeat the above two steps until a tree containing only the date, that is, Huffman tree tree

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n!不为0的最后一位，可以输出千万级别的阶乘最后一位-n! not the last one is 0, you can output level factorial million last