CN100534084C - Long-distance XML data updating method and system - Google Patents
Long-distance XML data updating method and system Download PDFInfo
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Abstract
A method for updating remote XML data includes decomposing data access request from far-end client computer to be data processing command sequence by data server for finalizing XML data query, obtaining a positioning information of data update then structuring and returning back data update command sequence presented by XQuery language according to data processing command sequence and background data variation occurred between two requests, finalizing data update by client computer through executing data update command sequence. The system for realizing said method is also disclosed.
Description
Technical field
The present invention relates in the XML Database Systems of Internet network, the data access request side of far-end carries out the method for Data Update according to the variation of data-base content to the data query result, and the data update system that is used to realize this method.
Background technology
Network data exchange standard on XML (extensible Markup Language) (XML language) has come true, XML database are widely used for realizing the data sharing in the Internet network.XML Database Systems towards the Internet network are made up of client computer, data server and XML database.Data access request side passes through to send data access request from the client computer of far-end, by Internet network access data server, and data server is responsible for the response data access request, according to data access request backstage XML database is carried out data query, and, return to data access request side by the Internet network with the data query result of XML data format response as data access request.
In the XML Database Systems of Internet network, data source supplier is often according to management and demands of applications modification or replenish data in the XML database of backstage this.When backstage XML data-base content changed, in order to guarantee the consistency of data query result and back-end data, data access request side was necessary to send once more access request, obtained the data query after the renewal.If the content frequent variations of background data base, when the frequency of data access request is higher, mass data query manipulation result will be sent to the client computer of far-end repeatedly by the Internet network.The restriction that the network bandwidth takes place to be subjected to repeatedly of the increase of volume of transmitted data and transfer of data causes the decline of XML Database Systems data processing speed and access request response speed.Simultaneously, the variation of data access frequency also will influence the overall performance of system, and then influence is based on the stability of the Internet network application system of XML database.
In the face of the problems referred to above, usually selectively the partial query operating result is kept at client computer in the existing data-updating method, variation identifies the wherein partial content of needs renewal according to back-end data according to specific strategy, replace whole data query result's renewal by more newly arriving of partial content, thereby reduce the network data transmission amount in Data Update.But, the realization of this method need be used special-purpose Data Update agreement, require the client computer of configure dedicated in the system for this reason, do not meet the service-oriented architecture of main flow in the present computer networking technology, be unfavorable for the realization of data sharing in the Internet network environment.Simultaneously, in view of the data exchange standard that has become the Internet network on the XML linguistic fact, client's data access request generally will adopt standard XML query language (XQuery language) in the applications of computer network, for the data query result that this data access request obtains, still lack effective method at present and discern and wherein need the partial content that upgrades.
Summary of the invention
The purpose of this invention is to provide the remote data update method in a kind of XML Database Systems, when data-base content changes, requirement according to request of data side, upgrade the data that last time inquired as early as possible, the consistency that keeps background data base content and front end data Query Result, the network data transmission amount improves the response speed of system and the stability of network application in the Data Update by reducing simultaneously.
The invention provides data-updating method, comprise the following steps:
(1) request of data side is when client computer is sent first data access request, and data server visit background data base obtains and the return data Query Result, and is kept at client computer.
(2) data server decomposes the data access request of receiving, obtain 15 kinds of data processing instructions: document node is obtained instruction, child node and is obtained that instruction is obtained in instruction, descendent node, node name is obtained instruction, joint structure instruction, condition query instruction, the instruction of sequence traversal, sequence structure instruction, sequence processing instruction, the compare instruction of document preface, arithmetic operation instruction, relational calculus instruction, logic instruction, type of switch instruction and constant structure and instructed, and, construct the data processing instructions sequence according to the given processing sequence of data access request.
(3) data server is kept at sender information, request content, request time and the data processing instructions sequence thereof of each data access request of being received in the network storage device.
(4) simultaneously, data server is monitored backstage XML data of database situation of change, data variation information is divided into knot removal, nodal community renewal, node updates, child node insert and child node is added 5 classes, change of location, change kind, changed content and the change time of the data variation form with the data variation daily record is kept in the network storage device.
(5) data server is when same sender receives identical data access request once more, then from network storage device, find out the data processing instructions sequence and the data variation daily record of this data access request, according to all back-end data change informations that take place between twice access request, analyze the data processing instructions sequence, obtain instruction according to the document node that order in the data processing instructions sequence occurs, child node is obtained instruction, descendent node is obtained instruction, condition query instruction and the represented access path of sequence traversal instruction, the visit background data base is found out the positional information and the construction data element positioning instruction of Data Update.
(6) analysis of data processing instruction sequence being carried out according to step (5), and the positional information of Data Update, from the data processing instructions sequence, take out the joint structure instruction, the instruction of sequence traversal, the node name that are used for data of description processing and obtain instruction, sequence structure instruction, sequence processing instruction, the compare instruction of document preface, arithmetic operation instruction, relational calculus instruction, logic instruction, type of switch instruction and the instruction of constant structure.
(7) the data change kind in the data variation information that obtains according to step (5) generates the Data Update command sequence according to the following step (8) to step (12) respectively.
(8) for the situation of knot removal, the data processing instructions that data element positioning instruction, data sequence element delete instruction and the step (6) that obtains with step (5) obtains constructs the Data Update command sequence.
(9) for nodal community news more, the data element positioning instruction that obtains with step (5), the data attribute that generates based on data variation information are provided with the data processing instructions that instruction and step (6) obtain and construct the Data Update command sequence.
(10) for the situation of node updates, the data element positioning instruction that obtains with step (5), based on the joint structure instruction and the sequential element update instruction of data variation information structuring, and the data processing instructions that step (6) obtains constructs the Data Update command sequence.
(11) situation about inserting for child node, the data element positioning instruction that obtains with step (5), insert instruction, and the data processing instructions that step (6) obtains constructs the Data Update command sequence based on the joint structure instruction and the sequential element of data variation information structuring.
(12) situation of adding for child node, the data element positioning instruction that obtains with step (5), based on the joint structure instruction and the sequential element extended instruction of data variation information structuring, and the data processing instructions that step (6) obtains constructs the Data Update command sequence.
(13) data server will be according to the Data Update command sequence of step (8) to step (12) structure, and the form according to the XQuery language returns to request of data side.
(14) the XQuery language representation's of request of data side's receiving step (13) generation Data Update command sequence, carry out this command sequence by calling the standard x Query processor of installing on the client computer, upgrade the data query result that obtained last time, XML data after obtaining to upgrade, that be consistent with background data base.
The invention provides data update system, be used for supporting of the realization of above-mentioned data-updating method at the Internet environment.The workflow of data update system includes a data server, at least one client computer, a network storage device and at least one XML database as shown in Figure 1.Data server is a computer that the service of Internet network is provided, the XML database that connects the backstage by internal network, be used for data access request according to the client computer transmission, the XML database is carried out data query and data variation monitoring, tissue and return data Query Result and Data Update command sequence.Network storage device connects data server by internal network, is responsible for the preservation of data access request and data processing instructions and data variation daily record.The XML database connects data server by internal network, is used to manage the XML data, and data variation information is provided.
Data server provides XML data by the Internet network to client computer.Client computer has the XQuery language processor, is used to send data access request, obtains data query result and Data Update command sequence, carries out data query result's renewal; As long as the computer of any connection network has been installed the XQuery processor of standard, just can be according to the following step access data services device.
(1) sends data access request, obtain the data query result from data server, and preserve.
When (2) in application, needing Data Update, when sending same data access request once more, obtain XQuery language representation's Data Update instruction from data server.
(3) on the XQuery processor, carry out the Data Update instruction that obtains, the data query result who last time obtains is upgraded.
The software systems of data server are monitored module by data access request module, Data Update instruction administration module and database and are formed.
The data access request module receives data access request, and backstage XML database is inquired about, and obtains the data query result, returns to client computer; And, data access request is resolved into the data processing instructions sequence is saved in network storage device.When data server is received same data access request from client computer once more, be responsible for processing by Data Update instruction administration module.
Data Update instruction administration module obtains the data processing instructions sequence and the data variation daily record of this data access request correspondence from network storage device, analyze the data processing instructions sequence, send the request of data locating query to the XML database, and according to the data locating information affirmation Data Update position that obtains, and then according to the database change information that takes place between twice access request, assemble out the Data Update command sequence that employing XML query language is represented, directly return to client computer.
Database is monitored the situation of change that module is responsible for monitoring the XML data-base content, and the data variation recording of information is saved in network storage device with the form of data variation daily record.
According to the method described above, when request of data side sends same data access request once more from client computer, obtain a Data Update command sequence that adopts the XML query language to represent, rather than complete data query result.The execution of Data Update command sequence has replaced the data query that repeats, and the transmission of Data Update command sequence has replaced the transfer of data of mass data Query Result.Because the data volume of Data Update instruction and the size of data variation are directly proportional, and back-end data content change amount all is significantly smaller than data query result's data volume in the application system under the overwhelming majority's situation, this method has reduced the volume of transmitted data in the Data Update significantly, has improved the response speed of XML Database Systems effectively.
Simultaneously, the realization of this data-updating method does not need to use special-purpose client computer, just can obtain the data that far-end XML database provides as long as be equipped with the XQuery processor of standard in any application system in the Internet network, and obtain Data Update timely by data update system of the present invention.This data, services mode meets the service-oriented architecture of main flow in the applications of computer network system fully, and, guaranteed that this method can satisfy the demand of main flow Internet network application exploitation and development thereof by data sharing and the exchanges data Language XML and the standard XML query language XQuery language of support standard.
Description of drawings
Fig. 1 is the workflow schematic diagram of data update system of the present invention;
Fig. 2 is the system construction drawing of a case study on implementation of the present invention;
Among the figure, 11, client computer, 12, data server, 13, the data access request administration module, 14, Data Update instruction administration module, 15, database monitors module, 16, network storage device, 17, XML database, 21, the XQuery processor, 22, data browser.
Embodiment
The system configuration of a case study on implementation of the present invention as shown in Figure 2.
Three client computer 11 that are in the network far-end have been provided among the figure, be equipped with data browser 22 and XQuery processor 21, by the Internet network data access request that data browser produces sent to data server 12, wherein data access request adopts the XQuery language representation.
(1) data access request with the XQuery language representation is decomposed into the data processing instructions sequence.
(2), be decomposed into instruction of sequence traversal and condition query instruction for the FLWOR expression formula among the XQuery language representation.
(3), be decomposed into document node and obtain that instruction is obtained in instruction, child node, descendent node is obtained instruction, the instruction of sequence traversal and condition query instruction for the XPath expression formula among the XQuery language representation.
(4), be decomposed into the condition query instruction for where expression formula among the XQuery language representation and if expression formula.
(5) for the logical operation expression formula among the XQuery language representation, be decomposed into logic instruction.
(6), be decomposed into relational calculus instruction, the compare instruction of document preface and type of switch instruction for the relational calculus expression formula among the XQuery language representation.
(7) express formula for the arithmetical operation among the XQuery language representation, be decomposed into arithmetic operation instruction.
(8), be decomposed into joint structure instruction, sequence structure instruction, sequence processing instruction and the instruction of constant structure for the series processing function among the XQuery language representation.
(9) the data processing instructions sequence that generates to step (8) according to step (2), visit XML background data base obtains the data query result, returns to client computer 11.
(10) sender information, request content, request time and the data processing instructions sequence thereof with each data access request of being received is kept in the network storage device 16.
(1) from network storage device 16, finds out the sender information of this data access request, request time and data processing instructions sequence and data variation daily record, identify all back-end data change informations that take place between twice identical data access request of same sender, occur according to order in the data processing instructions sequence, the document node that is used for the data of description access path is obtained instruction, child node is obtained instruction, descendent node is obtained instruction, condition query instruction and the instruction of sequence traversal, visit backstage XML database 17 is found out the positional information and the construction data element positioning instruction of Data Update.
(2) analysis of data processing instruction sequence being carried out according to step (1), and the positional information of Data Update, from the data processing instructions sequence, take out joint structure instruction, the instruction of sequence traversal, the node name of the data of description course of processing and obtain instruction, sequence structure instruction, sequence processing instruction, the compare instruction of document preface, arithmetic operation instruction, relational calculus instruction, logic instruction, type of switch instruction and the instruction of constant structure.
(3) the data change kind in the data variation information that obtains according to step (1) generates the Data Update command sequence according to the following step (4) to step (8) respectively.
(4) for the situation of knot removal, the data processing instructions that data element positioning instruction, data sequence element delete instruction and the step (2) that obtains with step (1) obtains constructs the Data Update command sequence.
(5) for nodal community news more, the data element positioning instruction that obtains with step (1), the data attribute that generates based on data variation information are provided with the data processing instructions that instruction and step (2) obtain and construct the Data Update command sequence.
(6) for the situation of node updates, the data element positioning instruction that obtains with step (1), based on the joint structure instruction and the sequential element update instruction of data variation information structuring, and the data processing instructions that step (2) obtains constructs the Data Update command sequence.
(7) situation about inserting for child node, the data element positioning instruction that obtains with step (1), insert instruction, and the data processing instructions that step (2) obtains constructs the Data Update command sequence based on the joint structure instruction and the sequential element of data variation information structuring.
(8) situation of adding for child node, the data element positioning instruction that obtains with step (1), based on the joint structure instruction and the sequential element extended instruction of data variation information structuring, and the data processing instructions that step (2) obtains constructs the Data Update command sequence.
(9) data server 12 will be assembled according to the form of XQuery language according to the Data Update command sequence of step (4) to step (8) structure, returns to client computer 11 as the response results of Web service.
(1) send data access request, activation data data in server query manipulation behind the data query result who obtains to return, is kept at local storage.
(2) preserved under data query result's the situation at local storage, sent same data access request once more, the activation data data in server is upgraded operation, obtains the Data Update command sequence of returning;
(3) call the local XQuery processor 21 that disposes, carry out the Data Update command sequence that obtains, the data query result in the update local memory.
The Web service software systems of data server are monitored module 15 by data access request administration module 13, Data Update instruction administration module 14 and database and are formed.
Data access request administration module 13 is responsible for realizing the data query operation of Web service, and following 4 functions are provided:
(1) XQuery language representation's data access request is carried out syntactic analysis and semantic analysis, be decomposed into the data processing instructions sequence;
(2) finish inquiry according to the data processing instructions sequence to backstage XML database 17;
(3) Query Result of acquisition XML database 17 returns to client computer 11;
(4) sender information, transmitting time and the data processing instructions sequence with request is saved in network storage device 16.
Database is monitored the data variation notifying operations that module 15 is responsible for realizing Web services, and change kind, change time and the changed content of data variation is kept in the network storage device, forms the data variation daily record.
Data Update instruction administration module 14 is responsible for realizing the Data Update operation of Web service, and following 3 functions are provided:
(1) from the database change daily record that network storage device 16 is preserved, obtains the database change record,, generate the Data Update instruction according to the kind of database change information;
(2) the data processing instructions sequence of this data access request correspondence of acquisition, the document node that occurs according to order is wherein obtained instruction, child node and is obtained instruction, descendent node and obtain and instruct and condition query instructs and sends the request of data locating query to the XML on backstage database, and according to the positional information construction data key element positioning instruction that obtains;
(3) instruction, sequence structure instruction, sequence processing instruction, the compare instruction of document preface, arithmetic operation instruction, relational calculus instruction, logic instruction, type of switch instruction and the instruction of constant structure are obtained in joint structure instruction, the instruction of sequence traversal, the node name of analyzing expression data processing in the data processing instructions sequence, Data Update instruction and data element positioning instruction in conjunction with preceding 2 steps generation, assemble out XQuery language representation's Data Update command sequence, directly return to client computer 11.
According to data-updating method of the present invention, data server can produce the XQuery language representation's of standard Data Update command sequence, directly apply to the Data Update of remote client, avoided repeating the data base querying of across a network, also avoided data query result's transmission repeatedly, significantly reduced the network data transmission amount, thereby improved the efficient that system carries out Data Update, also improved stability based on the network application system of XML Database Systems.Simultaneously, data server only limits to the inquiry of data locating information to backstage XML access of database in data updating process, make that the work load of XML database is also alleviated, and improves the stability of network application.
The above only is preferred embodiment of the present invention, be not in order to limit the scope of essence technology contents of the present invention, essence technology contents of the present invention broadly is defined in claims, any technology entity or method that other people are finished, if it is identical with the definien of claims institute, or be with the change of equivalence, all will be regarded as being covered by among the claim of the present invention.
Claims (10)
1, long-distance XML data updating method, be applied in the XML Database Systems, the request of data square tube is crossed client computer and is sent data access request to data server, obtain after the data in the long-distance XML database by data server, upgrade the data that obtain according to the variation of XML data-base content, it is characterized in that comprising the following steps:
1) request of data side is when client computer is sent first data access request, and data server visit background data base obtains and the return data Query Result, and is kept at client computer;
2) data server decomposes the data access request of receiving, data access request is resolved into data processing instructions, and according to the given processing sequence of data access request, constructs the data processing instructions sequence;
3) data server is kept at sender information, request content, request time and the data processing instructions sequence thereof of each data access request of being received in the network storage device;
4) simultaneously, data server is monitored backstage XML data of database situation of change, with the data variation information classification, the change of location of data variation, change kind, changed content and the change time form with the data variation daily record is kept in the network storage device;
5) data server is when same sender receives identical data access request once more, from network storage device, find out the data processing instructions sequence and the data variation daily record of this data access request, according to all back-end data change informations that take place between twice access request, analyze the data processing instructions sequence, according to the access path of representing in the data processing instructions sequence, by the position that visit backstage XML database comes specified data to upgrade, construction data element positioning instruction;
6) data server is according to data change kind, Data Update position, and the data processing request of representing in the data processing instructions sequence, generates the Data Update command sequence, returns to request of data side;
7) request of data side receives the Data Update command sequence, carries out Data Update according to the Data Update command sequence.
2, long-distance XML data updating method according to claim 1 is characterized in that: data server resolves into following 15 kinds of data processing instructions with data access request: document node is obtained instruction, child node and is obtained that instruction is obtained in instruction, descendent node, node name is obtained instruction, joint structure instruction, condition query instruction, the instruction of sequence traversal, sequence structure instruction, sequence processing instruction, the compare instruction of document preface, arithmetic operation instruction, relational calculus instruction, logic instruction, type of switch instruction and constant structure and instructed.
3, long-distance XML data updating method according to claim 1 and 2 is characterized in that: data server falls into 5 types data variation information: knot removal, nodal community renewal, node updates, child node are inserted and child node is added.
4, long-distance XML data updating method according to claim 3 is characterized in that: obtain according to the document node in the data processing instructions sequence that instruction is obtained in instruction, child node, descendent node is obtained instruction, condition query instruction and the instruction of sequence traversal and come specified data to upgrade the access path of position.
5, long-distance XML data updating method according to claim 4, it is characterized in that: according to the Data Update instruction that comprises the data variation kind, comprise the element positioning instruction of Data Update positional information, and joint structure instruction, the instruction of sequence traversal, the node name of expression data processing request obtained instruction, sequence structure instruction, sequence processing instruction, the compare instruction of document preface, arithmetic operation instruction, relational calculus instruction, logic instruction, type of switch instruction and constant and constructed and instruct construction data update instruction sequence in the data processing instructions sequence.
6, long-distance XML data updating method according to claim 1 or 5 is characterized in that: data server adopts the XML query language, and promptly XQuery language representation Data Update command sequence returns to request of data side; Request of data side receives XQuery language representation's Data Update command sequence, carry out this command sequence by calling the standard x Query processor of installing on the client computer, upgrade the data query result that obtained last time, XML data after obtaining to upgrade, that be consistent with background data base.
7, a kind of long-distance XML data updating system is characterized in that: include a data server, at least one client computer, a network storage device and at least one XML database; Wherein, data server connects network storage device and XML database by internal network, connects client computer by the Internet network;
When wherein said client computer is used to send first data access request, obtains corresponding data query result and preserve from data server; When being used for sending identical data access request once more, reception comprises the Data Update command sequence of data variation information and carries out Data Update according to the Data Update command sequence;
Wherein said data server is used for the data access request that client computer is sent is analyzed and processing and construction data update instruction sequence, carries out this process according to following steps:
1) data access request that the client computer of receiving is sent is decomposed, and data access request is resolved into data processing instructions, and according to the given processing sequence of data access request, construct the data processing instructions sequence;
2) sender information, request content, request time and the data processing instructions sequence thereof with each data access request of being received is kept in the network storage device;
3) simultaneously, monitor backstage XML data of database situation of change,, change of location, change kind, changed content and the change time of the data variation form with the data variation daily record is kept in the network storage device the data variation information classification;
4) when same sender receives identical data access request once more, from network storage device, find out the data processing instructions sequence and the data variation daily record of this data access request, according to all back-end data change informations that take place between twice access request, analyze the data processing instructions sequence, according to the access path of representing in the data processing instructions sequence, by the position that visit backstage XML database comes specified data to upgrade, construction data element positioning instruction;
5) according to data change kind, Data Update position, and the data processing request of representing in the data processing instructions sequence, generate the Data Update command sequence, return to request of data side;
Wherein said network storage device is used to store data access request, data processing instructions sequence and database change daily record;
Wherein said XML database is used to manage the XML data, and data variation information is provided.
8, data update system according to claim 7 is characterized in that: client computer has the XQuery language processor.
9, data update system according to claim 8 is characterized in that: network storage device is the network storage equipment of All-China Federation of Taiwan Compatriots's machine.
10, data update system according to claim 9 is characterized in that: data server has the data access request administration module, is used to handle the data access request from client computer; Have Data Update instruction administration module, be used for construction data update instruction sequence; Have database and monitor module, be used for the constructs database change journal.
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| CN101325520B (en) * | 2008-06-17 | 2010-08-18 | 南京邮电大学 | Method for locating and analyzing fault of intelligent self-adapting network based on log |
| CN101667190B (en) * | 2009-09-29 | 2011-07-27 | 天津大学 | XQuery-based query engine system |
| CN102024062B (en) * | 2011-01-06 | 2012-12-12 | 中国工商银行股份有限公司 | Device and method for realizing data dynamic cache |
| DE102013225058A1 (en) * | 2013-12-05 | 2015-06-11 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | DEVICE, SYSTEM AND METHOD FOR THE EFFICIENT AND DELIVERABLE SYNCHRONIZATION OF GRAPHIC DATA STRUCTURES |
| CN106301972A (en) * | 2016-11-16 | 2017-01-04 | 北京集奥聚合科技有限公司 | A kind of monitoring data push away method and system in real time |
| CN110940062B (en) * | 2018-09-25 | 2021-04-09 | 珠海格力电器股份有限公司 | Air conditioner control method and device |
| CN112749180B (en) * | 2021-01-19 | 2023-06-23 | 上海复佳信息科技有限公司 | Data management method, electronic device, and computer-readable storage medium |
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