Based On Metadata General Query And Statistical System For Research And Implementation

Along with the development of computer network technology, the global information times coming, more and more original data which are produced by scientific activities and everyday work, such as the numbers, files and charts, are stored in the database in digital form. How to obtain the demanded data from a large number of data continents, fast and accurate is a problem to be solved as soon as possible.In the traditional query system, developers develop inquire, statistics, report forms, and other modules according to the users' requirements. But the users'demands are complicatedly. So it is not realistic to design all different modules for satisfying the users personalized requirement. In addition, the information-system's data structure can be changed by the developing of enterprise and the changing of market. But the traditional hard code query system is not flexible enough. So the entire query system should be redeveloped caused by some little changes. Therefore, we should adopt one common approach to satisfy all different requirements of users. The text describes a kind of query system which is based on a metadata.For the users query requirements, the system concludes a common query system requirement of users after analyzing comprehensively.(1)Users can select query contents freely. All information of database is in the range users' selection. From users' viewpoint, the information in the database should be displayed in natural form. So the user has not to know the table's structure in the database, the table's relationship, and the definition of data item. Details of developing database should be shielded to users, although we should get data from some tables in the database.(2)Users can define the query case easily and freely. You search for time-date type data according to the time. You search for numerical data type according to numerical value. You search for character type data according to blurry case. It can be jointed by 'and ' or 'or' among a number of inquires according to special cases. All values of appointed data item should be browsed and selected by users.(3)For each specific query, users can define, modify query cases and query contents repeat on the basis of original material. Users can add query cases into the last query result. Also users can expand the cases of query.(4)Users can set many query themes by the same time parallel. It is so convenient to compare the results of query which are searched in different cases.(5)Users can adjust the format of data output which is the result of query. Including sorting the query results, setting output contents, ect.The system has two features.1, Timeliness feature.Timeliness feature makes searching system feedback query result in a short time. The method of improving timeliness is a buffer technology. It is a technology to store some query information in the memory for a long time. 2,Sequence feature sorts the query results logically. It makes sure the high relativity resources back first according to the searching results. Searching system carry's out the procedure from heap sorting to heap inside sorting, in using the set of searching results.The text is divided into four parts.The first part introduces the background of information query research. It makes sure that information searching organize information effectively and search data efficiently. Information organization forms a results' set for searching easily. But data query searches results from information sets to match the query case, and seed backs the results of query. All the query searching process is based on inputting key words or query cases. It analyzes the actuality of our country's technological resource. The feature is the large amount of data, the type of resource is complex, the structure of data storing resource is complex ,and the places of data storing are separate. It introduces two kinds of common full-text searching method matches the article directly without establishing index of database. The second method establishes a kind of inverted index for the full text.The second part introduces ASP. And it analyzes the features and proper conditions of ASP.The advantage of ASP.1,It is easy to develop. And it can be edited by any form of text editor. And process of developing is short.2,ASP is flexible, its theme is a HTML and a script which is a platform-independent. It can be changed and run in any operation environment without compiled.3,ASP program is independent of browser. It is executed in the side of server. SO the source code is hidden for the client.4,ASP is a object-oriented language. It can use any Active component which is developed by different programming languages.The third part introduces the research of metadata in the searching technology. It also introduces how metadata effects information searching. Metadata is a detailed description about the procedure and application program of data and controlling data. Its main objective is to provide a comprehensive guide to information resources.The fourth part is the emphases of the text. The query statically system which is based on metadata is compared with other kinds of query system. And after analyzing the demand, it gives the kernel designing model.The fifth part achieves the system. The text if special for the problem of promote information query in university technological literature. It bases on the research of domestic and abroad information searching developing situation, metadata principle, and the techniques in information drawing. At last, the text introduces a query statically system which has good timeliness feature.