CN104008135A - Multi-source heterogeneous database fusion system and data query method thereof - Google Patents
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Abstract
The invention provides a multi-source heterogeneous database fusion system and a data query method thereof. The system comprises a database layer, a data fusion layer and a uniform application layer. The database layer is composed of heterogeneous databases and agencies of the heterogeneous databases. The data fusion layer is used for fusing information of all heterogeneous data sources, and is responsible for data access of the heterogeneous data sources and coordinating the information of all the data sources, and specifically comprises a metadata data base (DB), a metadata manager, a comprehensive wrapper, a mediator, an application layer access uniform interface and a heterogeneous database uniform interface. The uniform application layer is the user of the heterogeneous database fusion system and can have access to shared data resources of the heterogeneous databases by fusing middle layers. The multi-source heterogeneous database fusion system and the data query method of the multi-source heterogeneous database fusion system solve the problems in heterogeneous database fusion and overcome the defects of an existing database fusion technology. The system can conduct transparent query on all the heterogeneous databases on the condition that local databases are not affected, and the maintenance cost of the system is reduced.
Description
Technical field
The present invention relates to a kind of database interfusion system, be specifically related to a kind of multi-source heterogeneous database interfusion system and data enquire method thereof.
Background technology
In the process of informatization, the department of a lot of enterprises is according to own service and function needs, set up the heterogeneous data source of many mutual isolation, owing to lacking unified information planning, the time of each Development of Management Information System and source are inconsistent, and development platform, data structure and the data base management system (DBMS) of employing are also different, have caused between each system separate, information cannot exchange and merge, and has formed gradually " information island " in inside.In order to address the above problem, be badly in need of proposing the novel method that a kind of multi-source heterogeneous database data merges, realize the mutual of information and share, safe and reliable, a high-quality Informatization Service is provided.
Traditional distribute objects technology has respectively CORBA (the Common Object Request Broker Architecture of OMG, Common Object Request Broker Architecture), the DCOM(Distributed Component Object Model of Microsoft, distributed component object pattern) and the RMI(Remote Method Invocation of SUN, remote method invocation (RMI)).But CORBA lacks developing instrument and the support of strong manufacturer easily, threshold is slightly high, gets started more difficult; DCOM professional platform independence is poor; RMI is but very weak to the support of multilingual fusion.Meanwhile, these several technology have similar defect: although 1. CORBA, DCOM and RMI can completely realize calling of system, all require the client and server must close-coupled and have identical architecture; 2. CORBA, DCOM and RMI depend on a specific object model agreement, are mainly used in enterprises, are all less compliant in and in Internet environment, carry out designing and developing of multi-source heterogeneous database interfusion.
The appearance of Web Service has met the desired basic function of Informatization Service, and the typical scenario of multi-source heterogeneous application under the .NET of Ta Shi Microsoft framework, compared with traditional distribute objects technology, has the following advantages:
(1) professional platform independence and across language.XML is a kind of self-described language, has shielded the difference between different language, and different development language can exchange shared data with same Web Service jointly.
(2) fusion work is simple, applied widely.Web Service is easy to learn, is convenient to design, exploitation, safeguards.Technological incorporation based on Web Service allows large-scale application be divided into the independent logical entity that scale is less and encapsulated, and applicability is strong, safe.
(3) use open standard protocol specification.In Web Service, all technology realize all standard agreements based on open, mainly contain HTTP(Hypertext Transfer Protocol), SOAP(Simple Object Access Protoco1), WSDL (Web Service Description Language), UDDI (Web Service Description Language), any Web service can be carried out alternately with other Web services, and greatly reducing enterprise is the cost of investment of supporting emerging Web technology.
(4) loose couplings.XML(Extensible Markup Language) and SOAP be all adapted at Internet environment and carry out message exchange protocol, it is all transparent that the realization of Web Service is changed for user.
The present invention is from application actual demand, realize a multi-source heterogeneous database interfusion system based on Web Service, this system can be in the situation that not affecting each local data bank, each heterogeneous database is carried out to transparent inquiry, in the time that needs add new database or existing database to change storage organization, the associated component in only need to amendment system, needn't revise whole system structure, can effectively process surge data volume, greatly reduce system maintenance cost.
Summary of the invention
The technical problem to be solved in the present invention is: propose a kind of multi-source heterogeneous database interfusion system, solve " information island " difficult problem in heterogeneous database fusion, overcome the deficiency of existing database integration technology.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of multi-source heterogeneous database interfusion system, comprising: database layer, data aggregation layer and unified application layer;
Described database layer is made up of heterogeneous database and heterogeneous database agency; Heterogeneous database agency utilizes Web Service to realize the access of heterogeneous database;
Described data aggregation layer is used for merging each isomeric data source information, is responsible for the data access of heterogeneous data source, coordinates the information between each data source simultaneously;
Described unified application layer is the user of heterogeneous database emerging system, visits the sharing data resources of heterogeneous database by data aggregation layer;
Wherein, described data aggregation layer specifically comprises: metadata DB, meta data manager, comprehensively packaging device, intermediary device, application layer access unified interface, heterogeneous database unified interface; Wherein,
Metadata DB, for preserving each metadata DB information of composition heterogeneous database emerging system;
Meta data manager, generates corresponding metadata according to the needs of application, the data table related in the data source of strange land, data type, function, deposit all processes and show with conflict free form;
Intermediary device, is responsible for the plug and play registration service of each heterogeneous database and generates common model, receives the global query's request from browser;
Comprehensively packaging device, the data source of being responsible for packing isomery, realizes the transparent of Data Position and access;
Application layer access unified interface and heterogeneous database unified interface, for transparent data access is provided, shield the otherness of each database.
Further, multi-source heterogeneous database interfusion system of the present invention, the type of described heterogeneous database comprises: Oracle, SQL Server, MySQL.
Further, multi-source heterogeneous database interfusion system of the present invention, the metadata DB information type of preservation: the log-on message of metadata DB, the link information URL of metadata DB, overall user and each metadata DB user's corresponding relation, access strategy information, mode map information.
Further, multi-source heterogeneous database interfusion system of the present invention, described intermediary device merges three module compositions of filtering module by isomeric data Registering modules, query planning module and result; Described isomeric data Registering modules is responsible for the shared registration of heterogeneous database and the foundation of common model at shared data registration phase; The standard queries based on global data base that described query planning module was responsible for client to submit in the data fusion stage resolves into the subquery for each heterogeneous database, and is submitted to corresponding wrapper; The XML document that described result merging filtering module is responsible for that each Query in Heterogeneous Databases is returned is merged into a complete unified Query Result, and sends it back client browser.
Further, multi-source heterogeneous database interfusion system of the present invention, described comprehensively packaging device comprises database manipulation module and Query Result modular converter; Wherein, database manipulation module is responsible for the connection management to background data base, comprises the initialization of database connection, the encapsulation of database basic operation, the distribution of connection, the closing function of connection; Described Query Result merges module is responsible for the results conversion of SQL query to become XML document.
The present invention also proposes a kind of data enquire method of multi-source heterogeneous database interfusion system, comprises the following steps:
A, user utilize http protocol from browser, send inquiry request to application layer unified interface, and application layer unified interface is analyzed execution after receiving user's inquiry request, is converted into query argument;
B, intermediary device obtain after query argument, search target database and tables of data, and carry out SQL decomposition by query planning module in metadata, generate the corresponding SQL subquery statement SQL1 of heterogeneous database, SQL2 ... SQLn, and prepare to carry out among putting into queue, n is natural number;
C, comprehensively packaging device be by database manipulation module, from query request by SQL subquery statement SQL1, SQL2 ..., SQLn sends in corresponding heterogeneous database and carries out;
Data after data query response are sent to comprehensively packaging device by D, heterogeneous database, by Query Result modular converter, and the Query Result DATA1 of each heterogeneous database, DATA2 ..., DATAn changes into XML1, XML2 ..., XMLn document;
The Query Result XML1 that E, intermediary device provide each database again, XML2 ... document is made fusion treatment, by XML1, XML2,, XMLn merges the processing of filtering module via result, merge incomplete data and filter the data that repeat, complete unified Query Result XML is sent to client browser, be presented in face of user via browser.
The technical solution used in the present invention compared with prior art, has following technique effect:
The present invention proposes a kind of multi-source heterogeneous database interfusion system, use the technology such as XML, Web Service to realize the fusion of multi-source heterogeneous database.By the service call of Web Service, the virtual data base of its structure, can reallocate resources effectively.The Web Service that the client of any operating system, any language compilation can both access services device provides, between its client and server using XML message as contact, thereby made up the deficiency of CORBA, DCOM and RMI method.Concrete advantage is as follows:
(1) installation upgrading is easy.The client that adopted above designs simplification, client can be the browser on any platform on network, has simplified client by browser access database.In upgrade software, do not need client to upgrade.
(2) expansion maintainability is good.All application all concentrate on server end, thereby make exploitation, maintenance process can concentrate on server end, without considering client.In addition, two-stage mapping relations between tri-level logic layer, have been set up, can make by mapping that wherein one deck changes time.The entirety of system is not formed to impact, reduced the cost that expansion is safeguarded.
(3) portable strong.The present invention adopts JSP and JavaBean not only can on different operating system, Web server, move, and while transplanting between different platforms, without recompiling.
(4) reliability is strong.Multi-tier systematic structure is optimization system overall performance effectively, improves reliability and the retractility of system.
Brief description of the drawings
Fig. 1 is multi-source heterogeneous database data emerging system Organization Chart.
Fig. 2 is comprehensively packaging device structural drawing.
Fig. 3 is intermediary device structural drawing.
Fig. 4 is system data querying flow figure.
Embodiment
Below in conjunction with the drawings and specific embodiments, a kind of multi-source heterogeneous database interfusion system of the present invention and data enquire method thereof are described in further detail.
A kind of multi-source heterogeneous database data emerging system framework as shown in Figure 1, comprises three layers from top to bottom altogether: database layer, data aggregation layer and unified application layer.
Database layer is made up of heterogeneous database and agency thereof.The particular type of heterogeneous database comprises: Oracle, SQL Server, MySQL, they provide actual data store and management function, can accept calling of upper strata.Database broker utilizes Web Service to realize the access of strange land database.In overwhelming majority application, database server is to be all placed on after fire wall to improve security, and outer net cannot be accessed.After increasing database broker, can obtain strange land data, can ensure like this safety of database, can accomplish again the fusion of data source.
Data aggregation layer is to realize the key that heterogeneous database merges, and its objective is and merges each isomeric data source information, is responsible for the data access of heterogeneous data source, coordinates the information between each data source simultaneously.Data aggregation layer is not stored actual data, and it is to set up an overall virtual view on the basis of the shared data that provide in each local data.Specifically comprise: metadata DB, meta data manager, comprehensively packaging device, intermediary device, application layer access unified interface, heterogeneous database unified interface, respectively each module is introduced below.
Metadata DB
Metadata DB, for preserving each metadatabase information of composition amalgamation database system, supports the operation of whole system.In order to realize the fusion of heterogeneous data source, should preserve following a few class metadatabase information: the log-on message of metadatabase, the link information URL of metadatabase, overall user and each metadatabase user's corresponding relation, access strategy information, mode map information.
Meta data manager
Meta data manager generates corresponding metadata according to the needs of application, and the data table related in the data source of strange land, data type, function, storing process are showed with conflict free form.Transformation rule between the pattern information of the responsible each local data bank of meta data manager, global view information and the heterogeneous schemas of emerging system.
Intermediary device
Intermediary device is be responsible for the plug and play registration service of each heterogeneous database and generate common model, receives the global query's request from browser.Intermediary device merges three module compositions of filtering module by isomeric data Registering modules, query planning module and result, as Fig. 3.Wherein isomeric data Registering modules is to be mainly responsible for the shared registration of heterogeneous database and the foundation of common model at shared data registration phase; In the data fusion stage, the standard queries based on global data base that query planning module is responsible for client to submit to resolves into the subquery for each heterogeneous database, and is submitted to corresponding wrapper; The XML document that result merging filtering module is responsible for that each Query in Heterogeneous Databases is returned is merged into a complete unified Query Result, and sends it back client browser.
Comprehensively packaging device
Comprehensively packaging device is responsible for packing the data source of isomery, realizes the transparent of Data Position and access.Wrapper receives the subquery statement that sends over of intermediary device and is connected the needed information of underlying database (for example type of database, database name, IP, port numbers), set up and being connected of bottom associated databases according to corresponding link information, carry out inquiry, from data source, obtain data query and these data are organized into the destination file with XML structure representation according to query structure.To heterogeneous data source, wrapper is exactly the translater of relation schema.Wrapper is mainly by database manipulation module and two module compositions of Query Result modular converter, as shown in Figure 2.Database manipulation module is mainly responsible for the connection management to background data base, comprises the initialization of database connection, the encapsulation of database basic operation, the distribution of connection, the closing function of connection.Query Result merges module is responsible for the results conversion of SQL query to become XML document.
Unified interface
Data aggregation layer externally provides two unified interface, i.e. application layer access unified interface and bottom isomerous database access interface.Its function is to provide transparent data access, shields the otherness of each database, and user does not need to know the concrete physical location of data and the pattern information of data source, can conducting interviews with the irrelevant SQL statement of particular source by system definition.
Namely user interface layer of unified application layer.Client layer is the user that heterogeneous database merges, and can visit by merging middle layer the sharing data resources of heterogeneous database.User is scattered in each place, does not need to install client application software, directly uses browser just can carry out query manipulation according to the authority of oneself.Concrete flow process be browser to the request of server submit Query, and Query Information is packaged as to HTTP request object, utilize http protocol to send to server, wait server to complete after corresponding inquiry and Organization of Data, then return to user.
In this isomeric data inquiry system, have three kinds of users and participate in, be respectively each isomery data base administrator, emerging system keeper and domestic consumer.Wherein emerging system keeper enjoys highest weight limit, can establishment and leading subscriber, examination and approval heterogeneous data source, the metadata of obtaining heterogeneous data source that need to add, synthesize and manage global data base pattern; Each isomery data base administrator can log in data source Accreditation System, and filling registration information as required selects to need shared table and field registration; Domestic consumer can only log in inquiry system, according to relevant search access right, data is inquired about.
Because the data source of each isomery in emerging system is autonomous, these resources belong to different departments, and some data needs certain authority to access, and some data even can not be shared, so need set sharable content.Specific embodiment of the invention comprises following two stages:
Data registration phase
Completed by the registration manager in intermediary device, main task has been the registration in data aggregation layer to each heterogeneous data source, selects the content (shared table and field) merging and the authority of accessing, and the model of building database fusion.In this stage, mainly contain each isomery data base administrator and emerging system keeper two class participation of roles, their main task is as follows:
Each isomery data base administrator: mainly complete logon data emerging system, content shared in database (sharable table and field) is selected, set with the access rights of the data shared.Select the type of database of own wish registration, submit to database hostname, port numbers, user name, encrypted message to register to emerging system keeper.
Data fusion system keeper: main task is the heterogeneous data source of the each registration of examination & verification, and the content merging and the authority of access are confirmed.Be responsible for collecting the database information of each registration by data aggregation layer, set up shared common model.
The system operation phase
The main task in this stage is accept the inquiry request of user's proposition and request is made to corresponding answer.Fig. 4 is system data querying flow figure, comprises the following steps:
A, user utilize http protocol from browser, send inquiry request to application layer unified interface, and interface is analyzed execution after receiving user's inquiry request, is converted into query argument;
B, intermediary device obtain after query argument, search target database and tables of data, and carry out SQL decomposition by query planning module in metadata, generate the corresponding SQL subquery statement SQL1 of heterogeneous database, SQL2 ... SQLn, and prepare to carry out among putting into queue, n is natural number;
C, comprehensively packaging device be by database manipulation module, from query request by SQL subquery statement SQL1, SQL2 ..., SQLn sends in corresponding heterogeneous database and carries out;
Data after data query response are sent to comprehensively packaging device by D, heterogeneous database, by Query Result conversion module, and the Query Result DATA1 of each heterogeneous database, DATA2 ..., DATAn changes into XML1, XML2 ..., XMLn document;
The Query Result XML1 that E, intermediary device provide each database again, XML2 ... document is made fusion treatment, by XML1, XML2,, XMLn merges the processing of filtering module via result, merge incomplete data and filter the data that repeat, complete unified Query Result XML is sent to client browser, be presented in face of user via browser.
Obviously, it will be appreciated by those skilled in the art that the multi-source heterogeneous database interfusion system of the disclosed one of the invention described above and data enquire method thereof, can also on the basis that does not depart from content of the present invention, make various improvement.Therefore, protection scope of the present invention should be determined by the content of appending claims.
Claims (6)
1. a multi-source heterogeneous database interfusion system, comprising: database layer, data aggregation layer and unified application layer; It is characterized in that:
Described database layer is made up of heterogeneous database and heterogeneous database agency; Heterogeneous database agency utilizes Web Service to realize the access of heterogeneous database;
Described data aggregation layer is used for merging each isomeric data source information, is responsible for the data access of heterogeneous data source, coordinates the information between each data source simultaneously;
Described unified application layer is the user of heterogeneous database emerging system, visits the sharing data resources of heterogeneous database by data aggregation layer;
Wherein, described data aggregation layer specifically comprises: metadata DB, meta data manager, comprehensively packaging device, intermediary device, application layer access unified interface, heterogeneous database unified interface; Wherein,
Metadata DB, for preserving each metadata DB information of composition heterogeneous database emerging system;
Meta data manager, generates corresponding metadata according to the needs of application, the data table related in the data source of strange land, data type, function, deposit all processes and show with conflict free form;
Intermediary device, is responsible for the plug and play registration service of each heterogeneous database and generates common model, receives the global query's request from browser;
Comprehensively packaging device, the data source of being responsible for packing isomery, realizes the transparent of Data Position and access;
Application layer access unified interface and heterogeneous database unified interface, for transparent data access is provided, shield the otherness of each database.
2. multi-source heterogeneous database interfusion system according to claim 1, is characterized in that: the type of described heterogeneous database comprises: Oracle, SQL Server, MySQL.
3. multi-source heterogeneous database interfusion system according to claim 1, is characterized in that: the metadata DB information type of preservation: the log-on message of metadata DB, the link information URL of metadata DB, overall user and each metadata DB user's corresponding relation, access strategy information, mode map information.
4. multi-source heterogeneous database interfusion system according to claim 1, is characterized in that: described intermediary device merges three module compositions of filtering module by isomeric data Registering modules, query planning module and result; Described isomeric data Registering modules is responsible for the shared registration of heterogeneous database and the foundation of common model at shared data registration phase; The standard queries based on global data base that described query planning module was responsible for client to submit in the data fusion stage resolves into the subquery for each heterogeneous database, and is submitted to corresponding wrapper; The XML document that described result merging filtering module is responsible for that each Query in Heterogeneous Databases is returned is merged into a complete unified Query Result, and sends it back client browser.
5. multi-source heterogeneous database interfusion system according to claim 1, is characterized in that: described comprehensively packaging device comprises database manipulation module and Query Result modular converter; Wherein, database manipulation module is responsible for the connection management to background data base, comprises the initialization of database connection, the encapsulation of database basic operation, the distribution of connection, the closing function of connection; Described Query Result merges module is responsible for the results conversion of SQL query to become XML document.
6. according to the data enquire method of the arbitrary described multi-source heterogeneous database interfusion system of claim 1-5, it is characterized in that: comprise the following steps:
A, user utilize http protocol from browser, send inquiry request to application layer unified interface, and application layer unified interface is analyzed execution after receiving user's inquiry request, is converted into query argument;
B, intermediary device obtain after query argument, search target database and tables of data, and carry out SQL decomposition by query planning module in metadata, generate the corresponding SQL subquery statement SQL1 of heterogeneous database, SQL2 ... SQLn, and prepare to carry out among putting into queue, n is natural number;
C, comprehensively packaging device be by database manipulation module, from query request by SQL subquery statement SQL1, SQL2 ..., SQLn sends in corresponding heterogeneous database and carries out;
Data after data query response are sent to comprehensively packaging device by D, heterogeneous database, by Query Result modular converter, and the Query Result DATA1 of each heterogeneous database, DATA2 ..., DATAn changes into XML1, XML2 ..., XMLn document;
The Query Result XML1 that E, intermediary device provide each database again, XML2 ... document is made fusion treatment, by XML1, XML2,, XMLn merges the processing of filtering module via result, merge incomplete data and filter the data that repeat, complete unified Query Result XML is sent to client browser, be presented in face of user via browser.
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