Design And Implementation Of Query Language For RFID Event Streams

RFID technology has been applied widely. With the expasion of RFID technology, people realize that the original data(ie.primitive event) except for item identification and tracking, the combination(ie.composite event) often contains the meaning of certain application, can support higher level business applications. This implies that the ability of RFID data, causing great concern to academia and industry. A good query language may have a better expression on RFID event which may carry rich meaning. Therefore Query language research about RFID is becoming necessary.In This article, Query language of the typical RFID system has been carried on thorough research. General query language for RFID systems queries for general logic . Rarely involving the temporal relationship and the probability about the query And query is limited .a In light of this In this paper, non-deterministic model of RFID events have been studied for its ability to express and operation ability of the analysis, design of a query language SUN for a real-time applications of RFID event streams, It is based on SQL language of a traditional database query language It not only can support the general logic on the event flow, can also contain temporal search and probability search. Realizing before the timing, after the timing, timing cycle, 7 kinds of temporal iterative query definition and query a small probability, conditional probability of four kinds of definition of the probability of query .In This article,It also designs and implements SUN parser which bases query language SUN, It gives the internal representation of the query syntax tree structure, tree node structure, syntax tree building process and algorithms on SUN . It also gives the operator Specific algorithm which designes to facilitate the commencement of the call syntax tree structure. And designeds function which gives the operator the whole process of query processing.the design of the thread pool to support the commencement of syntax tree, the result queue is designed to support complex Flow of events when the composite event detection comes back, giving the syntax tree to start with the backtracking algorithm; The parser is implemented on SUN and composite event detection in VC + +6.0.