CN102063502A - Method for realizing synchronization of data in heterogeneous database - Google Patents
Method for realizing synchronization of data in heterogeneous database Download PDFInfo
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Abstract
The invention discloses a method for realizing the synchronization of data in a heterogeneous database, wherein the heterogeneous database comprises a database A and a database B. The database A is a database applied by the user, an access interface of the database adopts a JDBC (Java Database Connection) interface, and the database B is a target database performing the data synchronization. The heterogeneous database further comprises a JDBC driver AB (Address Bus) matching the SUN standard. The driver AB comprises a JDBC drive packet of the database A and a JDBC drive packet of the database B. Function calls of the driver AB are changelessly transmitted to a JDBC driver of the database A, function calls changing the database are mapped and converted by sql syntax and then transmitted to a JDBC driver of the database B.
Description
Technical field
The present invention relates to a kind of method of fulfillment database system data synchronization, especially relate to a kind of method that realizes that heterogeneous database data is synchronous.
Background technology
In the network environment of enterprise-level, heterogeneous database while and the phenomenon of depositing exist more and more at large, such as, adopt the SQL Server database of Microsoft in market department, adopt homemade magic database in research and development department, and the director server of enterprise adopts the ORACLE database, the situation that this heterogeneous database uses simultaneously the scheme of many system integrations with implement in of common occurrence, so the data content between disparate databases become a problem of generally making us being concerned about synchronously.At present, each big Sybase product all provides and has carried out synchronous function separately between the database.Existing synchronizing function generally adopts the publish/subscribe model to realize.In general, the publish/subscribe model comprises following object: publisher server, Distributor, Subscriber, architecture are as shown in Figure 1.
Publisher server: publisher server provides data so that be synchronized to the server of other server.
Distributor: Distributor is a server of specifically carrying out the data distributed tasks.
Subscriber: Subscriber is the server of receiving isochronous data.
At first, issue configuration,, carry out synchronous cycle etc. to be provided with synchronous content at publisher server; Subscriber is subscribed to the issue that configures as required; Distributor can be carried out data distribution according to the issue configuration, and data are write Subscriber.Under such implementation model, after data were written into publication database, Distributor regularly removed to check data change according to the issue configuration, these data changes is extracted write Subscriber then.
Yet there are two main problems in this simultaneous techniques:
1, can not realize data sync between heterogeneous database
The realization and the database server of publisher server and Distributor be closely related (because will obtain the support that data change on the database server needs database itself), each database manufacturer can only develop the publisher server and the Distributor of the database product that cooperates oneself, can only accomplish at most that at present subscription database can be other databases, this mainly shields difference between disparate databases by the sql standard.
2, the support to real-time is good not enough
Distributor goes to check the change of publication database by the cycle of setting, and then writes subscription database, and this generally has several seconds time-delay, and real-time performance is good inadequately.
Summary of the invention
In order to address the above problem, present technique provides a kind of new method, and it is can be between any two databases real-time carries out data sync.
For realizing above-mentioned goal of the invention, the present invention adopts following technical scheme:
A kind of method that realizes that heterogeneous database data is synchronous, wherein heterogeneous database comprises database A and database B, database A is that the user uses employed database, and database access interface uses the JDBC interface, and database B is the destination data storehouse of carrying out data sync; Comprise that also the JDBC that meets the SUN standard drives AB, described driving AB comprises the JDBC driving bag of A and the JDBC of B drives bag; The function call that drives on the AB is all driven by the JDBC that former state passes to database A, and database is had the function call of change, then through after the sql grammer mapping conversion, the JDBC that passes to database B again drives, and wherein the step of data sync is as follows:
Step 1, connect, the JDBC that driver AB calls database A and database B respectively drives, set up and database A be connected ConnectionA and with the ConnectionB that is connected of database B;
Step 2, establishment statement, driver AB is setting up StatementA and setting up StatementB on ConnectionB respectively on the ConnectionA;
Step 3, transmit the function call of application program, and whether call having change in the database, be divided into two kinds of processing modes again according to this to the JDBC interface, wherein:
For the function call of the content of database not being had change, driver AB only calls such and is transmitted to database A, when obtaining metadata, the operation that obtains metadata information does not influence the data of synchronous destination data storehouse B, drive the driver that AB just is transmitted to this operation database A, obtain the return results of database A;
To having the function call of change in the database, driver AB calls such and is transmitted to database A and database B simultaneously, when carrying out the renewal operation, wherein more the operation of new data is influential to the data of synchronous destination data storehouse B, driver AB can call the driver of database A and database B simultaneously, the data between synchronous two databases;
Step 4, close statement, driver AB is close statement StatementA and StatementB simultaneously;
Step 5, close connection, driver AB closes simultaneously and connects ConnectionA and ConnectionB.
Present technique is utilized the standard interface of database access, such as ODBC, JDBC, OLEDB, perhaps other database access standard interfaces (as long as database synchronization both sides all support) encapsulate them, and the renewal statement (insert of database is issued in all application of carrying out database access by standard interface, update delete) can be forwarded to other database.Use this method, by the database access standard interface, the difference conductively-closed between database product; And, using send statement in the target database, this statement also sends to sync database simultaneously, and real-time is very good.
Description of drawings
The present invention is further illustrated below in conjunction with the drawings and specific embodiments.
Fig. 1 is data base architecture figure in the prior art;
Fig. 2 is the real-time synchronous schematic diagram of the heterogeneous database of the embodiment of the invention;
Fig. 3 is the schematic diagram of asynchronous execution of synchronous operation of the heterogeneous database of the embodiment of the invention;
Fig. 4 is the system construction drawing of embodiments of the invention.
Embodiment
Below, the present invention further specifies the data sync that how to realize heterogeneous database by specific embodiment.
At first, the concrete principle of the embodiment of the invention is down described.
Database Systems are all supported some standard database access interface (ODBC, JDBC, OLEDB etc.), real-time synchronization technique based on heterogeneous database has utilized these standard interfaces just, with the JDBC interface is example, its ultimate principle is: suppose to have heterogeneous database A and B, A is employed database for the user uses, database access interface uses JDBC, B is the destination data storehouse of carrying out data sync, then need to develop the JDBC that meets the SUN standard and drive AB, the JDBC that wherein comprises A drives the JDBC driving bag of bag and B; In realization, the user is driven by the JDBC that former state passes to database A the function call in the AB driving, and database is had the function call of change, and then through after the sql grammer mapping conversion, the JDBC that passes to database B again drives.Ultimate principle figure as shown in Figure 2.
As shown in Figure 2, we are divided into following two parts to user's JDBC interface interchange by function, and take different processing policies respectively.
1, the function call of change is called and database is had to basic function
Basic function is called and is comprised with background data base and connecting, and creates operations such as statement.The function call that database is had change comprises execution inquiry, the attribute setting on the statement, the renewal operation on the result set etc.Because these operations may produce change to the content of database, so for guarantee between database A and the B synchronously, the AB driver must call the JDBC driver of database A and database B simultaneously, passes to database A and B calling, finish between them synchronously.
It should be noted that, because the relevant SQL statement that the function call of application program relates to is at database A, and database B may not support these SQL statement, therefore must finish necessary transformation according to the SQL characteristic of database A and B, such as the conversion of SQL type and the mapping of SQL function.
2, the function call of the content of database not being had change
Mainly be that some obtain operation, comprise obtaining database metadata, inquire about way of submission and obtain type map information etc.Because these operations can not exert an influence to the content of database, consider that for performance the AB driver only can call the driver of database A, returns the result that calls to database A.
Below we call the idiographic flow that example is set forth the method for synchronous of the embodiment of the invention with a common JDBC.To be the user change partial data in the database by JDBC to major function.
Originally invocation step is as follows, and user program drives by JDBC and directly calls database A:
1) connects;
2) create statement;
3) obtain metadata;
4) carry out the renewal operation;
5) close statement;
6) close connection;
After realization met the AB driving of JDBC standard, user program calls the AB driver, and was as follows in each steps A B driver synchronous working:
1) connects
The JDBC that calls database A and database B respectively drives, set up and database A be connected ConnectionA and with the ConnectionB that is connected of database B;
2) create statement
Simultaneously setting up StatementA on the ConnectionA and on ConnectionB, setting up StatementB;
3) obtain metadata
Because the operation that obtains metadata information does not influence the data of synchronous destination data storehouse B, therefore drives the driver that AB just is transmitted to this operation database A, obtains the return results of database A;
4) carry out the renewal operation
More the operation of new data is influential to the data of synchronous destination data storehouse B, so driver AB can be transmitted to this operation database A and database B, their data synchronously simultaneously.
5) close statement
While close statement StatementA and StatementB;
6) close connection
Close simultaneously and connect ConnectionA and ConnectionB.
Above-mentioned implementation method has been transferred to client to the task of database synchronization from server end, and by distributing at the enterprising line function of database standard access interface layer, fulfillment database is synchronous.According to the requirement of using real-time, the all right asynchronous execution of synchronous operation, its principle is as follows: the user is passed to the JDBC driving of database A by former state to the function call in the AB driving, and database there is the function call of change, after type mapping and sql grammer mapping conversion, what the JDBC of conversion paired data storehouse B drove calls, but do not carry out these calls at once, but they are put into a formation, dispose and server health according to the user by a worker thread, in suitable, carry out these and call, with data sync in target database.The benefit of this implementation strategy is that the user uses and can not feel obviously that database access is slack-off, but this is to have sacrificed certain real-time to obtain.Its schematic diagram as shown in Figure 3.
In the same way, also can realize standard database access interfaces such as ODBC, OLEDB, the user is distributed to the interface function of A and the interface function of B to calling of these interface functions.
By the present invention, can realize between heterogeneous database in real time synchronously.
For example, certain unit now adopts homemade magic OSCAR database based on OA (Office Automation, the office automation) system of Web.This unit is for the needs of combined data, every day all will be from magic database image data, converge into form such as employee's gate card and employee's reimbursement table etc.And direct image data from former magic database cause certain pressure can for the existing application system, influences the performance of system.Service provides a large amount of supports to form owing to the SQLServer database simultaneously, and as statement analysis service SSAS, developing form thereon can be more simple and easy to do.Therefore, scheme decision regular with magic OSCAR database and SQLServer database synchronization, that produce copy to the SQLServer database new with the data in real time that changes.
As shown in Figure 4, this OA system uses IIS as application server, has developed a series of asp page and com component and has been deployed on the IIS server, uses ADO and ODBC to visit magic database.
On the thinking basis synchronous based on the heterogeneous database of driver, developed Oscar-SQLServer ODBC and driven, realized the real time data synchronization of magic database to SQLServer.The total system structural drawing as shown in Figure 4.
Application by present technique, on the one hand this OA system successfully realized between heterogeneous database synchronously in real time, can use synchronous destination data storehouse operation form on the other hand, test, consistency check, software development etc., and can not influence the use of existing OA system, thereby the minimizing resource contention has strengthened the stability and the extensibility of OA system.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these changes believed and distortion all should belong to the protection domain of the appended claim of the present invention.
Claims (2)
1. method that realizes that heterogeneous database data is synchronous, wherein heterogeneous database comprises database A and database B, database A is that the user uses employed database, and database access interface uses the JDBC interface, and database B is the destination data storehouse of carrying out data sync; Comprise that also the JDBC that meets the SUN standard drives AB, described driving AB comprises the JDBC driving bag of A and the JDBC of B drives bag; The function call that drives on the AB is all driven by the JDBC that former state passes to database A, and database is had the function call of change, then through after the sql grammer mapping conversion, the JDBC that passes to database B again drives, and wherein the step of data sync is as follows:
Step 1, connect, the JDBC that driver AB calls database A and database B respectively drives, set up and database A be connected ConnectionA and with the ConnectionB that is connected of database B;
Step 2, establishment statement, driver AB is setting up StatementA and setting up StatementB on ConnectionB respectively on the ConnectionA;
Step 3, transmit the function call of application program, and whether call having change in the database, be divided into two kinds of processing modes again according to this to the JDBC interface, wherein:
For the function call of the content of database not being had change, driver AB only calls such and is transmitted to database A, when obtaining metadata, the operation that obtains metadata information does not influence the data of synchronous destination data storehouse B, drive the driver that AB just is transmitted to this operation database A, obtain the return results of database A;
To having the function call of change in the database, driver AB calls such and is transmitted to database A and database B simultaneously, when carrying out the renewal operation, wherein more the operation of new data is influential to the data of synchronous destination data storehouse B, driver AB can call the driver of database A and database B simultaneously, the data between synchronous two databases;
Step 4, close statement, driver AB is close statement StatementA and StatementB simultaneously;
Step 5, close connection, driver AB closes simultaneously and connects ConnectionA and ConnectionB.
2. the synchronous method of realization heterogeneous database data as claimed in claim 1, all right asynchronous operation of wherein said method for synchronous, its step is as follows:
Steps A, the function call that drives on the AB is all driven by the JDBC that former state passes to database A;
Step B, database is had the function call of change, after type mapping and sql grammer mapping conversion, calling of the JDBC driving of conversion paired data storehouse B do not called but do not carry out these at once, but they put into a formation;
Step C, by a worker thread according to user configuration and server health, in suitable, carry out above-mentioned calling, with data sync in target database.
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| CN102262662A (en) * | 2011-07-22 | 2011-11-30 | 浪潮(北京)电子信息产业有限公司 | System, device and method for realizing database data migration in heterogeneous platform |
| CN103020112A (en) * | 2012-11-06 | 2013-04-03 | 深圳中兴网信科技有限公司 | Heterogeneous database synchronizing system and heterogeneous database synchronizing method |
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