Mobile database this concept, very much perhaps before 5 years person never heard of before. But now, its specific application already very extensive. The reader that just engaged this notion may interrogative, what is mobile database? Say simply, data is not purely memory on server or PC, also can deposit suffer in memory and processing function on the mobile equipment that be restricted. These installation are on mobile equipment, using management and the system that operate data is so called mobile database.
Need to store on mobile equipment below a lot of circumstances a few data. Before mobile database has not been born, all data are to deposit in the file, when data bulk is greater, undertake retrieval to data, deleting the efficiency that waits for an operation is very low. A lot of companies consider the diversity of mobile equipment now, use XML generally to save data, although XML is a kind of documentation standard that has nothing to do with platform, but because of current shift the processing capability of equipment is restricted, when because this is analytic,one includes the XML file of more data, the expense of its function cannot satisfy real requirement. And mobile database can call a database, the data bulk that shows mobile database can be included namely can be achieved quite the dimensions of degree, and be not a few data (a few or hundreds of records) can be likened to.
In this special subject, will undertake spreading out around two keys: One is the mobile database —SQL Server 2005 Compact Edition of Microsoft. The data that another is edition of shift of development of “ use.net Compact Framework manages systematic ” . The hope passes this special subject, the development respect that can make the reader runs a system in the data of mobile edition more handy.
The application of mobile database
Find a place for on mobile equipment a mobile database, such doing significant? Believe a lot of people can have such doubt, and the programmer that has experience of a lot of development hears the author to move in application at the outset when the database develops a system, also be exceedingly mysterious. Nevertheless, you can consider to fall further, if material information can progress to just be carried and obtain more easily, the profit that has as follows:
1. Reduce the load of central server
Current great majority system needs front program to get data information from inside central server database, if be put in many visit to request, central server will be in very busy condition, can produce the bottleneck problem of function at this moment. For this, microsoft put forward intelligent client to carry this idea, make the program can leave the job below line position with be in, also can fall in couplet network position move. In if we are OK,saving the partial data in central server database mobile database, such a lot of function implementation can be in directly mobile equipment end is finished, reduced the bear of central server and pressure substantially.
Previous12 Next
Hot Tags: