CN102456052A - Method for data synchronization between embedded device and database - Google Patents
Method for data synchronization between embedded device and database Download PDFInfo
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Abstract
The invention discloses a method for data synchronization between an embedded device and a database, belonging to the field of computer data processing. In the method, network connection state of the embedded device is judged, when the network is not connected, the data to be operated is stored in a new data document, and a data operating instruction log is added. When the network is connected, the records of the operating instruction log and the content of the new data document are transmitted to a database server one by one, thus, the database server can realize data synchronization according to corresponding instructions. Moreover, interruption of network connection in the data transmission process can be remedied by retransmission, so that the synchronization between the embedded device and a remote database, namely the data consistency between the embedded device and the remote database, is guaranteed.
Description
Technical field
The present invention relates to a kind of embedded device and database synchronization method, during especially a kind of embedded device off-line and database carry out the method for data sync, belong to the embedded database field.
Background technology
The data base management system (DBMS) of present main flow; Like Oracle, MS-SQL Server, Sybase, DB2, MySQL etc.; All on original data copy function, add more assembly; The instrument that provides many data to duplicate proposes and has studied various data sync clone methods to different application, has increased more powerful technical support.
In the distributed data base applied environment, different applications is different to requiring of duplicating of data, can not have a kind of clone method can be fit to the application need in all spectra.Following for this reason three kinds of copy type satisfy the application need in the varying environment:
1. snapshot: snapshot is the simplest a kind of copy mode in the database, and publication structure and data mode at a time in its copies data storehouse given Subscriber through replication agent with the publication snapshot afterwards.The snapshot operation is realized with the distribution agency by snapshot agent.In the snapshot document (but not being distribution database) of Distributor, and record duplicates synchronous operation to snapshot agent in the distribution database of Distributor with the structure of each clauses and subclauses (table) in the publication and copying data.Distributor is again according to distribution database. in synchronous recording snapshot document is delivered in the destination data storehouse of Subscriber.
2. transactional replication: when adopting the transactional replication mode; After Subscriber carried out initial synchronisation to the publication in the publication server, database was kept watch on INSERT, UPDATE; The execution of Data Update statements such as DELETE, and the affairs that influence publication are identified.Transaction journal is read the agency and from transaction journal, is caught the variation of publishing data in the clauses and subclauses, and will cause that the affairs of these variations copy in the distribution database of Distributor.Afterwards; By Distributor these affairs are passed to Subscriber; And order is carried out these affairs on Subscriber, copy data is made increment revise, thereby guarantee the copy data and the data consistent of publishing in the server publication (but not being realtime uniform) in the Subscriber.Because the data volume of affairs is much smaller than its operated data of database amount, so adopt the transactional replication mode can effectively alleviate the communications burden of network.
3. merge replication: merge replication allows the subscription data in the user's modification Subscriber, and it can be kept watch on the data variation in the subscription database automatically and regularly these variations merged again and submit to all subscribers to the result after merging.Exist when conflicting if in merging process, find the modification that different user is made data, the merging Agent is that set which user's of priority ruling of subscriber modification is effective in the time of will subscribing to according to foundation.
Above the whole bag of tricks all is to method of data synchronization between the network state good data storehouse; Use under the situation more and more widely at mobile embedded type equipment; The synchronous requirement of mobile embedded type equipment and database information progressively is improved; And mobile embedded type equipment network environment complicacy can't guarantee constantly to be in the networking state; This moment just seem synchronously all the more important of device data, yet current but do not have a kind of to mobile embedded type equipment under the Network Isolation state and database carry out the method for data sync.
Retrieval finds that number of patent application is the transmission method that the Chinese patent of 200810216201.X discloses a kind of large data objects, and this method has solved the data forward problem under the unexpected disconnection of network when data transmit between the equipment.Yet this method does not solve embedded device under the network disconnection, because of can't in time operating the data loss problem that causes to remote data base.
Summary of the invention
The objective of the invention is to: to the defective of above-mentioned prior art, proposes a kind of can solve mobile embedded type equipment under temporary physical segregation state and database carry out the embedded device and the method for synchronizing data of database of a data sync difficult problem.
For achieving the above object, technical scheme of the present invention is: a kind of embedded device and database synchronization data method, said embedded device are realized and the data sync of the database server of wireless telecommunications (referring to Fig. 9) each other according to the following steps:
Step 1, the request of generation database manipulation;
Step 2, readiness database operation also judge that whether current embedded device is connected with network, in this way, carry out step 3; Otherwise carry out step 4;
Step 3, inspection judge that whether the local data working area has new operational order daily record and new data document, then carry out step 31 in this way, otherwise carry out step 33;
Step 31, read new operational order daily record;
Step 32, generate the corresponding database operational order, database operating instruction is sent to database server together with the new data document, forward step 5 again to according to the record of operational order daily record;
Step 33, carry out routine data synchronous transmission operation, forward step 5 again to database server;
Step 4, inspection judge whether to receive the off-line operation instruction, if then carry out step 41, then carry out steps 42 if not;
Step 41, stop operation, return step 2 database;
Step 42, startup local data working area are set up storage and are intended the new data document to the concrete data of database manipulation, preferably can carry out the xml data file of exchanges data easily with database;
The new operational order daily record to database concrete operations instruction intended in step 43, foundation record;
Step 44, return step 2;
Step 5, inspection judge to the transmission of database server transmission data whether accomplish, if then finish the operation to database server, otherwise carry out step 6;
Step 6, inspection judge that whether the network of current embedded device breaks off connection, if then return step 2, otherwise carry out step 7;
Step 7, again local data working area new data document content is sent to database server, send transmission, finish operation database server until accomplishing.
Technique scheme can be through judging the embedded device network connection state, and when network did not connect, the data that need are operated deposited the new data document in, the daily record of especially XML carrier, and interpolation data manipulation instruction.After network connects,, issue database server one by one, database server can be operated database through the xml file according to corresponding instruction, realize data sync together with the content of new data document again with the record of operational order daily record.And, can also connect interrupt taking the remedial measures retransmitted to the network in the data transmission procedure, thereby guarantee the synchronous of embedded device and remote data base, i.e. data consistency between embedded device and remote data base.
This shows; Method of the present invention can be accomplished data sync under the situation that does not influence the operation of application program normal data storehouse; Make the embedded database user carry out the mutual of data and to need not to consider whether network keeps being connected with long-range database easily, thereby improved the adaptability of embedded device.
Conclusion is got up, and the present invention has following remarkable advantage:
1, adaptability is high.Need not to increase any accessory hardware; Only need corresponding data processing software to be installed at embedded device and database one end; Just can realize that embedded device is synchronous with data of database under interval property Network Isolation state, fill up embedded device is interrupted accessing database under the off-line state at network technological vacancy.
2, method is simple.After adopting the present invention, it is directly simple that the method for embedded device accessing database server becomes, and therefore can significantly improve efficiency of research and development, makes Application developer's attention location system exploitation, and need not to pay close attention to the influence of network connection state.
3, be widely used.The present invention is applicable to any embedded system with wireless communication module, can be in health care, and national defense and military, numerous areas widespread uses such as field work.
Description of drawings
Below in conjunction with accompanying drawing the present invention is further described.
Fig. 1 is the hardware configuration of one embodiment of the invention and data communication and mutual synoptic diagram each other thereof.
Fig. 2 is the basic flow sheet of Fig. 1 embodiment.
Fig. 3 is that the embedded device of Fig. 2 embodiment generates database manipulation request process flow diagram.
Fig. 4 is Fig. 2 embodiment direct and database communication process flow diagram under network connection state.
Fig. 5 is the database manipulation process flow diagram of Fig. 2 embodiment under the network not-connected status.
Fig. 6 is Fig. 2 embodiment embedded device, data bank network topological diagram.
Fig. 7 is the data structure synoptic diagram of the instruction bag of Fig. 2 embodiment.
Fig. 8 is the journal format synoptic diagram of Fig. 2 embodiment.
Fig. 9 is the overview flow chart of Fig. 2 embodiment.
Embodiment
Embodiment one
For making the object of the invention, technical scheme and advantage clearer, below lift and be mainly used in the embodiment of embedded device, and combine accompanying drawing, further explain of the present invention.
As shown in Figure 1, the hardware environment of present embodiment comprises that mainly embedded device 110 reaches the database server 120 of radio communication contact with it.Embedded device 110 includes application program 111, mode converter 112, local data working area 113 and the communication customer end 114 of accessing database; Database server 120 comprises communication service end 121, data processing module 122 and database 123.
Connect through wireless mode between communication service end 121, the communication customer end 114.The core synchronizing function of mode converter 112 and data processing module 122 completion systems.
The communication customer end 114 of embedded device 110 provides the functional module set that is connected communication with communication service end 121 essence on the database server, mainly is responsible for connection communication and exchanges data between embedded device and the database.Mode converter 112 is judged network connection state; The database manipulation of application programs request is not handled when network connects; Transfer data to the xml form and dump to local data working area 113, and be recorded under the network not-connected status in each operational order daily record database.When network connects, this module during with off-line operational order daily record and the data xml file to database send to database server 120; Local data working area 113 is used for application program under the not connection situation of storage networking to contents such as the data of database accessing operation and daily records.
The network topological diagram of present embodiment is as shown in Figure 6: remote data base is installed on the server, and speed and efficient are higher; Server need be connected in the LAN.Adopt the embedded device of IEEE802.11b/g communication standard to be connected in the identical LAN through wireless aps, embedded device also can work under the environment that does not have net.
The main-process stream of present embodiment the steps include: referring to Fig. 2
Application program on step 201 embedded device produces the accessing database request;
Present embodiment above-mentioned steps 201 embedded devices produce the process of accessing database request referring to Fig. 3, and its concrete operations step is:
Application program reception operator's on step 301 embedded device operation generates the request instruction of corresponding operating database;
After step 302 built-in application program is analyzed the database request that is generated, be packaged into SQL instruction bag according to predetermined format; Predetermined format can be self-defined according to the actual requirements, and purpose is to realize for ease, for example takes the encapsulation of form as shown in Figure 7.Wherein TYPE_ID is the packet header of SQL instruction bag, characterizes instruction type: as the query manipulation in the SQL statement is defined as " S ", inserts operation and be defined as " I ", upgrade operation and be defined as " U ", deletion action is defined as " D "; SQL COMMAND is a SQL character string, like " select * from users ";
Step 303 application program is sent the accessing database request to mode converter;
Present embodiment above-mentioned steps 203 described normal (different embedded devices can be operated by its original mode normal synchronized) as shown in Figure 4 with the database synchronization idiographic flow:
Step 401 communication customer end establishes a communications link through ICP/IP protocol and communication service end, and this communication establishment of connection can be based on wireless or wired mode;
Step 402 judgment data storage goes whether data are arranged, and does not Update Information if having, and step 403 then is if Update Information then step 410;
Step 403 communication customer end sends the SQL instruction bag that generates through this connection of setting up to the communication service end;
Step 404 server end is transferred to the data processing module processing after receiving the instruction bag, parses the SQL instruction by form encapsulation noted earlier;
Step 405 data processing module is operated database according to the SQL instruction that parses;
Step 406 returns to embedded device for the application call on embedded with the database manipulation successful result;
Whether step 407 judgment data sends completion, in case data network service in process of transmitting is interrupted, does not accomplish then step 408 if send, and accomplishes then step 412 if send;
Step 408 judges whether current network state connects, if in the network state connection, then step 409 is accomplished then step 412 if send;
Step 409 data that retransfer are returned step 407;
Not synchrodata and daily record that step 410 will be stored in the data working area send to database server;
Daily record that step 411 data processing module basis sends over and data xml document are operated database and the state state in the journal file in data working area are changed into synchronous regime, are 1.State is the status information of this daily record, as: whether be synchronized, if then be 1 synchronously, if then be not 0 synchronously;
Step 412 finishes.
Present embodiment above-mentioned steps 204 described mode converter notification application current network state, and the database manipulation concrete operations step of launching under the network not-connected status is following:
Step 501 is sent current offline network state to application program, to confirm whether proceed the offline database operation;
Step 502 mode converter judges that application program is selected and whether continues off-line operation,
If do not carry out the offline database operation, then step 503; If carry out then step 504 of off-line operation;
Step 503 withdraws from;
Step 504 mode-conversion module is extracted packaged instruction bag, and the instruction of the SQL in the bag is parsed;
The data division of during step 505 will be instructed data being operated is stored in the storage space of embedded device with the form of XML document;
Step 506 mode switch module generates a journal file in the data working area, this document records application program is to the instruction and the time of database manipulation, and concrete form is seen Fig. 8; Wherein, Date&Time writes down the current operating database time, as: 2010-10-21&10:20:00; SQL COMMAND writes down this database operating instruction content, and user's information of this operation carried out in the User record, and State is the status information of this daily record; As: whether be synchronized; If then be 1 synchronously,, return step 202 at last if then be not 0 synchronously;
So just accomplished whole embedded device and the database synchronous flow process under the unstable situation of network state.Integrate, the synchronous whole process of the embedded device of present embodiment and database data is as shown in Figure 9:
The record of operational order daily record in step 907, the reading of data working area;
The whether off-line operation instruction of step 904, inspection judges input if then carry out step 906, then stops the operation to database if not, returns step 902;
The new operational order daily record to database concrete operations instruction intended in step 906, foundation record, return step 902;
Present embodiment makes mobile embedded type equipment connect and do not influence under the situation of original working method at temporary no network; Still can accomplish corresponding operating to data; Be connected to when an opportunity arises afterwards in the network, carry out data sync with database again, thereby need not the connection of dependency network; Enlarge the range of application of mobile embedded type equipment, properly settled the data consistency problem between embedded device and database.
Except that the foregoing description, the present invention can also have other embodiments.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of requirement of the present invention.
Claims (4)
1. embedded device and method for synchronizing data of database is characterized in that: said embedded device is realized and the data sync of the database server of wireless telecommunications each other according to the following steps:
Step 1, the request of generation database manipulation;
Step 2, readiness database operation also judge that whether current embedded device is connected with network, in this way, carry out step 3; Otherwise carry out step 4;
Step 3, inspection judge that whether the local data working area has new operational order daily record and new data document, then carry out step 31 in this way, otherwise carry out step 33;
Step 31, read new operational order daily record;
Step 32, generate the corresponding database operational order, database operating instruction is sent to database server together with the new data document, forward step 5 again to according to the record of operational order daily record;
Step 33, carry out routine data synchronous transmission operation, forward step 5 again to database server;
Step 4, inspection judge whether to receive the off-line operation instruction, if then carry out step 41, then carry out steps 42 if not;
Step 41, stop operation, return step 2 database;
Step 42, startup local data working area are set up storage and are intended the new data document to the concrete data of database manipulation, preferably can carry out the xml data file of exchanges data easily with database;
The new operational order daily record to database concrete operations instruction intended in step 43, foundation record;
Step 44, return step 2;
Step 5, inspection judge to the transmission of database server transmission data whether accomplish, if then finish the operation to database server, otherwise carry out step 6;
Step 6, inspection judge that whether the network of current embedded device breaks off connection, if then return step 2, otherwise carry out step 7;
Step 7, again local data working area new data document content is sent to database server, send transmission, finish operation database server until accomplishing.
2. embedded device according to claim 1 and method for synchronizing data of database is characterized in that: said new data document is the xml data file.
3. embedded device according to claim 1 and 2 and method for synchronizing data of database is characterized in that: said embedded device includes and is used to generate the database manipulation application requested, is used for when network does not connect mode converter, local data working area and the communication customer end of data conversion storage to the local data working area; Said database server comprises communication service end, data processing module and database; Be connected through wireless mode between said communication service end and the communication customer end.
4. embedded device according to claim 3 and method for synchronizing data of database is characterized in that: the detailed process that said step 1 produces the accessing database request is:
Application program reception operator's on step 301 embedded device operation generates the request instruction of corresponding operating database;
Step 302 application program is packaged into SQL instruction bag to the database request that is generated according to predetermined format;
Step 303 is sent the accessing database request to mode converter.
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| CN103473372A (en) * | 2013-09-29 | 2013-12-25 | 方正国际软件有限公司 | Management server, multi-dimensional mirror image service system and multi-dimensional mirror image data management method |
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| CN104346479A (en) * | 2014-11-26 | 2015-02-11 | 北京奇虎科技有限公司 | Database synchronization method and database synchronization device |
| CN104506606A (en) * | 2014-12-19 | 2015-04-08 | 苏州卫生职业技术学院 | Method for embedded device to access remote database |
| CN104935634A (en) * | 2015-04-27 | 2015-09-23 | 南京大学 | Mobile equipment data sharing method based on distributed sharing storage |
| CN105306554A (en) * | 2015-09-30 | 2016-02-03 | 北京恒华伟业科技股份有限公司 | Data synchronization method and the local server |
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| CN107800699A (en) * | 2017-10-27 | 2018-03-13 | 安徽兆尹信息科技股份有限公司 | A kind of mobile terminal for financial secure environment and gateway server transmission method |
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| CN111695055A (en) * | 2019-03-11 | 2020-09-22 | 新疆丝路大道信息科技有限责任公司 | Data cache management method and system for automobile leasing platform and electronic equipment |
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| CN107800699A (en) * | 2017-10-27 | 2018-03-13 | 安徽兆尹信息科技股份有限公司 | A kind of mobile terminal for financial secure environment and gateway server transmission method |
| CN111382130A (en) * | 2018-12-20 | 2020-07-07 | 鸿合科技股份有限公司 | Content submission method and device and electronic equipment |
| CN111695055A (en) * | 2019-03-11 | 2020-09-22 | 新疆丝路大道信息科技有限责任公司 | Data cache management method and system for automobile leasing platform and electronic equipment |
| CN115714782A (en) * | 2022-10-26 | 2023-02-24 | 郑州云智信安安全技术有限公司 | Data synchronization method and device capable of realizing offline interaction |
| CN115714782B (en) * | 2022-10-26 | 2024-03-05 | 北京云智信安科技有限公司 | Data synchronization method and device capable of offline interaction |
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Application publication date: 20120516 Assignee: WELLONG ETOWN INTERNATIONAL LOGISTICS CO., LTD. Assignor: Jiangsu University Contract record no.: 2018320000051 Denomination of invention: Method for data synchronization between embedded device and database Granted publication date: 20130410 License type: Exclusive License Record date: 20180309 |
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