CN103246711B - The snapshot creation method of a kind of binary large object categorical data and device - Google Patents
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Abstract
Embodiments providing snapshot creation method and the device of a kind of binary large object categorical data, described method includes: the file format of BLOB categorical data in identification database system；According to the corresponding relation of default file format Yu snapshot generating algorithm, obtain the snapshot generating algorithm corresponding with the file format of described BLOB categorical data；Snapshot generating algorithm according to described correspondence, generates the snapshot corresponding with described BLOB categorical data；In described Database Systems, store the snapshot corresponding with described BLOB categorical data, and store the mapping relations between described BLOB categorical data with described corresponding snapshot.The present invention is by the file format of BLOB categorical data in automatic identification database, generate the snapshot corresponding with this BLOB categorical data, and preserve the relation between the snapshot that described BLOB categorical data is corresponding with this at this data store internal, reduce developer's workload and snapshot obtains the time delay responded.
Description
Technical field
The invention belongs to database field, the snapshot particularly relating to a kind of binary large object categorical data generates
Method and device.
Background technology
Binary large object BLOB(Binary Large Object), it is whole as one in Database Systems
The set of the binary data of body, typical application is used to store multimedia object such as picture, sound, regard
Frequency etc..The generation of this data type of BLOB is later than relational database, is primarily due to this kind of data type and deposits
Storage content is too big, does not also have the demand of this respect commercial relational database occurs when.Now with letter
The development of breath technology, the object handled by computer is taken up space and is also increased dramatically, for the process of BLOB
Also being becoming better and approaching perfection day by day, current main flow relational database platform all supports blob data type.
At present, typically will be stored in the BLOB in data base by query language interface to retrieve from data base
Out use.During retrieval BLOB, the operation principle of data store internal is: due to the volume of BLOB excessive (
As more than 2G), typically will not preserve the BLOB of reality in table, only can preserve an address, address refers to
To position be BLOB actual storage region.Application layer is come to visit by calling the access interface of data base
Asking BLOB, Database Systems return the content of BLOB in a streaming manner, and then application program opens this
Object.BLOB passes back at present directly the method that client carries out opening there is the problem that and work as BLOB
The when of super large, the same time transmits a collection of BLOB can increase the response delay of client, affects Consumer's Experience；
Also the network bandwidth can be caused bigger pressure, reduce the utilization ratio of hardware resource.Such as: Mei Getu
Sheet file 100M file, in the network of average transmission speed 100m/s, the time delay passing to client exceedes
1s, if adding the client opening time to big file, this time is by longer.Due to network bottleneck,
Along with the increase of return BLOB number, the consumption meeting journey linear increase of time delay and the network bandwidth, even can lead
Cause network congestion.
Solution of the prior art is essentially all first distinguishes preview type access scenario and the visit of actual reading out type
Ask scene, for preview type scene, be usually after database server side takes out BLOB, by advance
The processing routine of association calculates the snapshot of BLOB in real time, then this snapshot is returned to client and carries out
Display.Preview scene lower network transmission bandwidth can be reduced and time client file is opened by this technology
Between, but, this technology adds snapshot generation module equal between processing data base and application program,
And the exploitation of this module is also more complicated, user needs to realize for multiple high efficiency BLOB's
Snapshot extraction algorithm, actually used in the relation of client-cache to be handled well and snapshot, add extra
Development amount；And for preview snapshot process the time can by the actual type of BLOB, size and
The impact of snapshot extraction algorithm, in the occasion of BLOB super large, extract real-time snapshot may spend substantial amounts of
Time, bad also may can extend response delay if processed in actual applications.
Summary of the invention
The purpose of the embodiment of the present invention is that the snapshot providing a kind of binary large object BLOB categorical data is raw
Become method and device, it is intended to solve, owing to prior art is when obtaining the snapshot of BLOB categorical data, to exist
The problems such as complexity is high, snapshot response delay is higher.
First aspect, the snapshot creation method of described binary large object BLOB categorical data includes: identify
The file format of BLOB categorical data in Database Systems；Calculation is generated with snapshot according to default file format
The corresponding relation of method, obtains the snapshot generating algorithm corresponding with the file format of described BLOB categorical data；
Snapshot generating algorithm according to described correspondence, generates the snapshot corresponding with described BLOB categorical data；Institute
State the snapshot that in Database Systems, storage is corresponding with described BLOB categorical data, and store described BLOB class
Mapping relations between type data with described corresponding snapshot.
In the first possible implementation of first aspect, described method also includes: receives client and sends out
The snapshot of the snapshot that BLOB categorical data described in the acquisition request sent is corresponding obtains request, and described snapshot obtains
Request includes the mark of described BLOB categorical data；BLOB described in request is obtained according to described snapshot
In the mark of categorical data, and described Database Systems, the described BLOB categorical data of storage is right with described
Mapping relations between the snapshot answered, in described Database Systems, inquiry obtains described BLOB categorical data
With described corresponding snapshot, and by the snapshot access interface preset, by corresponding for described BLOB categorical data
Snapshot send to described client.
In conjunction with first aspect or in the first possible implementation of first aspect, in the reality that the second is possible
In existing mode, before the snapshotting step that described generation is corresponding with described BLOB categorical data, described method
Also include: obtain the system time that described Database Systems are current, and judge that the snapshot the preset generation time is
No identical with institute system time；If it is, perform the described snapshot generating algorithm according to described correspondence, raw
Become the step of the snapshot corresponding with described BLOB categorical data；If it is not, then repeat described acquisition institute
State the system time that Database Systems are current, and judge described default snapshot generate the time whether with described system
The step that the system time is identical, until described default snapshot generate the time current with described Database Systems be
The system time is identical.
Can in conjunction with the first possible implementation of first aspect or first aspect or the second of first aspect
The implementation of energy, in the implementation that the third is possible, in described generation and described BLOB number of types
Before step according to corresponding snapshot, described method also includes: obtain the size of described BLOB categorical data；
Judge whether the size of described BLOB categorical data exceedes predetermined threshold value；The described snapshot according to described correspondence
Generating algorithm, generates the snapshot corresponding with described BLOB categorical data, including: when described BLOB type
When the size of data exceedes predetermined threshold value, by BLOB categorical data described in described Database Systems Background scheduling
Corresponding snapshot generating algorithm, generates the snapshot corresponding with described BLOB categorical data；As described BLOB
When the size of categorical data is not less than predetermined threshold value, generate according to the snapshot that described BLOB categorical data is corresponding
Algorithm, generates the snapshot corresponding with described BLOB categorical data.
Can in conjunction with the first possible implementation of first aspect or first aspect or the second of first aspect
The implementation of energy, in the 4th kind of possible implementation, in described generation and described BLOB number of types
Before step according to corresponding snapshot, described method also includes: arrange the generation parameter of snapshot, described generation
Parameter includes the compression ratio of snapshot, size；The described snapshot generating algorithm according to described correspondence, generates and institute
State the snapshot that BLOB categorical data is corresponding, including: according to the snapshot generating algorithm of described correspondence, Yi Jishe
The described generation parameter put, generates the snapshot corresponding with described BLOB categorical data, and generate described
The compression ratio of the snapshot that BLOB categorical data is corresponding and size with respectively with the compression ratio in described generation parameter
Mate with size.
In conjunction with the first possible implementation of first aspect or first aspect, the 5th kind of possible realization
In mode, described method also includes: when detecting that described BLOB categorical data is deleted, and deletes in institute
State the snapshot corresponding with described BLOB categorical data of storage in Database Systems, delete described simultaneously
Mapping relations between BLOB categorical data with described corresponding snapshot.
Second aspect, the snapshot generating means of described BLOB categorical data includes: format identification unit, uses
The file format of BLOB categorical data in identification database system；Algorithm acquiring unit, for according to pre-
If the corresponding relation of file format and snapshot generating algorithm, obtain the file with described BLOB categorical data
The snapshot generating algorithm that form is corresponding；Snapshot signal generating unit, for the snapshot generating algorithm according to described correspondence,
Generate the snapshot corresponding with described BLOB categorical data；And memory element, at described data base set
System stores the snapshot corresponding with described BLOB categorical data, and stores described BLOB categorical data and institute
State the mapping relations between the snapshot of correspondence.
In the first possible implementation of second aspect, described device also includes: time judging unit,
For obtaining the system time that described Database Systems are current, and judge the snapshot preset generate the time whether with
Described system time is identical；And result treatment unit, for when described time judging unit output result being
When being, trigger described snapshot signal generating unit immediately；Otherwise, time judging unit described in repeated trigger, until
It is identical that described default snapshot generates the time system time current with described Database Systems.
In conjunction with the first possible implementation of second aspect or second aspect, in the realization that the second is possible
In mode, described device also includes: acquiring unit, for obtaining the size of described BLOB categorical data；
Judging unit, for judging whether the size of described BLOB categorical data exceedes predetermined threshold value；Described snapshot
Signal generating unit, specifically for judging that when described judging unit the size of described BLOB categorical data exceedes pre-
If during threshold value, trigger snapshot corresponding to BLOB categorical data described in described Database Systems Background scheduling and generate
Algorithm, generates the snapshot corresponding with described BLOB categorical data；When described judging unit is judged described
When the size of BLOB categorical data is not less than predetermined threshold value, according to corresponding fast of described BLOB categorical data
According to generating algorithm, generate the snapshot corresponding with described BLOB categorical data.
In conjunction with the first possible implementation of second aspect or second aspect, in the realization that the third is possible
In mode, described device also includes: parameter definition unit, for arranging the generation parameter of snapshot, described life
Parameter is become to include the compression ratio of snapshot, size；Described snapshot signal generating unit, specifically for according to described correspondence
Snapshot generating algorithm, and arrange described generation parameter, generate corresponding with described BLOB categorical data
Snapshot, and the compression ratio of snapshot corresponding to described BLOB categorical data generated and size with respectively with institute
State the compression ratio generated in parameter and size coupling.
In the 4th kind of possible implementation of second aspect, described device also includes: edit cell, uses
In when detecting that described BLOB categorical data is deleted, delete in described Database Systems storage with
The snapshot that described BLOB categorical data is corresponding, deletes described BLOB categorical data corresponding with described simultaneously
Mapping relations between snapshot.
The embodiment of the present invention is by the file format of BLOB categorical data, root in automatic identification database system
According to the corresponding relation of default file format Yu snapshot generating algorithm, obtain and described BLOB categorical data
The snapshot generating algorithm that file format is corresponding, further according to the snapshot generating algorithm of described correspondence, automatically generate with
The snapshot that described BLOB categorical data is corresponding, and at described Database Systems storage inside and described BLOB
The snapshot that categorical data is corresponding, and store reflecting between described BLOB categorical data with described corresponding snapshot
Penetrate relation, fully transparent to user to realize, solve prior art and obtain the fast of BLOB categorical data
According to time, there is the problems such as development amount is big, snapshot response delay is higher, it is possible to realize at data store internal
The snapshot concordance with corresponding BLOB categorical data so that exploitation complexity and snapshot response time delay are all
To reducing.
Accompanying drawing explanation
Fig. 1 is the realization stream of the snapshot creation method of the BLOB categorical data that first embodiment of the invention provides
Cheng Tu；
Fig. 2 is the realization stream of the snapshot creation method of the BLOB categorical data that second embodiment of the invention provides
Cheng Tu；
Fig. 3 is the realization stream of the snapshot creation method of the BLOB categorical data that third embodiment of the invention provides
Cheng Tu；
Fig. 4 is the structure of the snapshot generating means of the BLOB categorical data that fourth embodiment of the invention provides
Figure；
Fig. 5 is the structure of the snapshot generating means of the BLOB categorical data that fifth embodiment of the invention provides
Figure.
Detailed description of the invention
In order to make the purpose of the present invention, technical scheme and advantage clearer, below in conjunction with accompanying drawing and reality
Execute example, the present invention is further elaborated.Only should be appreciated that specific embodiment described herein
Only in order to explain the present invention, it is not intended to limit the present invention.
The file format automatic identification algorithm of the BLOB categorical data that the embodiment of the present invention is preset by basis,
Automatically the file format of BLOB categorical data in identification database system, according to default file format with fast
According to the corresponding relation of generating algorithm, automatically obtain the snapshot corresponding with the file format of this BLOB categorical data
Generating algorithm, further according to corresponding snapshot generating algorithm, automatically generates corresponding with this BLOB categorical data
Snapshot, and at the Database Systems storage inside snapshot corresponding with described BLOB categorical data, and store should
Mapping relations between BLOB categorical data with described corresponding snapshot, fully transparent to user to realize,
And can custom file format, recognizer and snapshot generating algorithm etc., generation side according to actual needs
Method is relatively more flexible, and when client needs the snapshot returning a certain BLOB categorical data, directly by fast
Return the required snapshot previously generated according to access interface, reduce snapshot response time delay.Further, since be not required to
The snapshot generation module of complexity is increased as prior art, also between data base and application program process
Need not the relation handling client-cache well with snapshot, also reduce development amount.
Below in conjunction with specific embodiment the present invention implemented and is described in detail:
Embodiment one:
Fig. 1 shows the reality of the snapshot creation method of the BLOB categorical data that first embodiment of the invention provides
Existing flow process, details are as follows:
In step S101, the file format of BLOB categorical data in identification database system.
Generally, BLOB categorical data is taken as binary data to process inside Database Systems,
But certain concrete file format can be identified as, such as according to the storage content characteristic etc. of binary data
Various file formats under the file format type such as picture format, audio format, video format, XML format,
As, jpg, bmp, avi, rmvb, mp3, wav etc..The tray of concrete BLOB categorical data
The recognition methods of formula and correspondence can flexible expansion, user can increase custom file format and identification side
Method etc..It addition, in by step S101 identification database system the file format of BLOB categorical data
After step, it is also possible to the file format determining whether this BLOB categorical data is registered literary composition
Part form, if it is, continue executing with step S102, no, then this BLOB categorical data can not be entered
Row subsequent treatment.In embodiments of the present invention, it not when the file format judging this BLOB categorical data
During the file format registered, it is also possible to the file format of this BLOB categorical data is converted to tray of the same race
The file format specified under formula type, is further continued for performing subsequent operation afterwards.
In step s 102, according to the corresponding relation of default file format Yu snapshot generating algorithm, obtain with
The snapshot generating algorithm that the file format of this BLOB categorical data is corresponding.
In step s 103, according to the snapshot generating algorithm of this correspondence, generate and this BLOB categorical data
Corresponding snapshot.
Wherein, with each file format to snapshot generating algorithm can according to user to generate snapshot type,
The requirement of parameter, is arranged voluntarily by user, amendment etc..Such as, related algorithm is set, by certain image pane
The generation of the BLOB categorical data of formula has the image snapshot of certain compression ratio；Lossy Compression Algorithm is set,
The generation of the BLOB categorical data of audio format is had the audio frequency snapshot of certain compression ratio；Relevant pressure is set
Compression algorithm, generates compressed video snap-shot etc. by the BLOB categorical data of video format, certainly this
The algorithm of the snapshot size of place's generation, compression ratio, accuracy etc. and the corresponding snapshot of generation etc. can be voluntarily
Configure, namely user can revise voluntarily according to acquisition algorithm etc..Wherein, after the generation parameter of snapshot is set,
This generation parameter includes the compression ratio of snapshot, size etc., then according to the snapshot generating algorithm of this correspondence, and
This generation parameter arranged, generates the snapshot corresponding with this BLOB categorical data, and this BLOB generated
The compression ratio of the snapshot that categorical data is corresponding and size with respectively with the compression ratio in this generation parameter and size
Join.Wherein, this degree specifically mated can be identical, it is also possible to arranges certain range of error,
As long as the compression ratio of snapshot corresponding to this BLOB categorical data generated and size with respectively with this generation parameter
In compression ratio and the error that exists of size in this range of error, then it is assumed that the match is successful, it addition, also
Can arrange the compression ratio of snapshot corresponding to this BLOB categorical data of generation and size respectively less than and this
Generate the compression ratio in parameter and size etc., can arrange the most flexibly, do not limit at this.
It addition, generate the snapshot corresponding with this BLOB categorical data time can according to default time point etc.
Trigger control etc..
In step S104, these Database Systems store the snapshot corresponding with this BLOB categorical data,
And store the mapping relations between the snapshot that this BLOB categorical data is corresponding with this.
In specific implementation process, in identification database after the file format of BLOB categorical data, root
According to the corresponding relation of the file format pre-set Yu snapshot generating algorithm, obtain and this BLOB categorical data
Snapshot generating algorithm corresponding to file format, and then, according to the snapshot generating algorithm of this correspondence, generate with
The snapshot that this BLOB categorical data is corresponding, finally, storage and this BLOB type in these Database Systems
The snapshot that data are corresponding, and store the mapping relations between the snapshot that this BLOB categorical data is corresponding with this.
It should be noted that the storage position of snapshot is transparent to user, namely when certain BLOB categorical data being detected
When being modified or deleted, can automatically corresponding amendment or delete the snapshot corresponding with this BLOB categorical data and
Relation, user need not be concerned about its actual storage locations, as long as can by this BLOB categorical data with should
The corresponding mapping relations between snapshot, snapshot that inquiry is corresponding, and snapshot and corresponding BLOB originally
Body can be stored in continuous print memory space, it is also possible to is discrete memory space, does not limits at this.
It addition, the snapshot creation method of this BLOB categorical data is further comprising the steps of:
Receiving that the snapshot of snapshot corresponding to this BLOB categorical data of acquisition request that client sends obtains please
Asking, this snapshot obtains request and includes the mark of this BLOB categorical data；
Obtain this BLOB categorical data mark in request according to this snapshot, and these Database Systems store
This BLOB categorical data snapshot corresponding with this between mapping relations, inquire about in these Database Systems
Obtain the snapshot that this BLOB categorical data is corresponding with this, and by the snapshot access interface preset, should
The snapshot that BLOB categorical data is corresponding sends to this client.
In embodiments of the present invention, the snapshot creation method of this BLOB categorical data is applied to the number of main flow
According in system library, in such as Oracle11g, SQL Server2008, My SQL5.5 etc..Then for reality
Border is read under the scene of blob data content, and application layer is come to visit by calling the access interface of data base
Asking BLOB, Database Systems return the content of BLOB in a streaming manner, then application program layer open this
Individual object；And under the scene of preview snapshot, when needing the snapshot of this BLOB categorical data of preview, then apply
Program layer accesses BLOB by calling the snapshot access interface of data base, and then should according to prestore
Relation between the snapshot that BLOB categorical data is corresponding with this, obtains the snapshot of this correspondence prestored,
The snapshot of this correspondence is back to application layer, this snapshot of application program layer open by Database Systems.
In embodiments of the present invention, obtain each by the snapshot creation method of this BLOB categorical data
After the snapshot that BLOB categorical data is corresponding, then can receive this BLOB of acquisition request that client sends
The snapshot of the snapshot that categorical data is corresponding obtains request, obtains in request according to this snapshot in Database Systems
Comprise this BLOB categorical data mark, and in these Database Systems storage this BLOB categorical data with
Mapping relations between the snapshot of this correspondence, inquiry obtains the snapshot that this BLOB categorical data is corresponding with this,
By default snapshot access interface, snapshot corresponding for this BLOB categorical data is sent to this client,
Namely the snapshot corresponding with this BLOB categorical data can be returned quickly and accurately to this client, raising
The speed of inquiry snapshot, reduces snapshot response delay；With it, can also be further to snapshot
It is normalized, retrieval BLOB carried out to realize user to realize based on content etc., is similar to
Existing image search method, it is also possible to generate the snapshot of different stage according to the level of detail of snapshot contents,
So that different access rights access the snapshot of different stage, thus range of application is wider；Actually used
In, client can obtain relevant snapshot immediately, it is not necessary to goes concerned with customer end caching to generate the time with snapshot
Relation etc., reduce extra development amount and complexity；Owing to this method need not first from data base
System reads BOLB categorical data in real time, generates snapshot in real time, also reduce due to inquiry transmission BLOB
And the bandwidth taken, finally enhance Consumer's Experience effect.
Embodiment two:
Fig. 2 shows the reality of the snapshot creation method of the BLOB categorical data that second embodiment of the invention provides
Existing flow process, details are as follows:
In step s 201, the file format of BLOB categorical data in identification database.
In step S202, it is judged that whether the file format of this BLOB categorical data is registered, is,
Then perform step S204；No, then perform step S203.
In step S203, the file format of this BLOB categorical data is converted to class file format of the same race
The file format specified under type, and continue executing with step S204.
In step S204, according to the corresponding relation of default file format Yu snapshot generating algorithm, obtain with
The snapshot generating algorithm that the file format of this BLOB categorical data is corresponding.
Specifically, owing to being not previously set the corresponding snapshot generating algorithm of certain file format, such as file
Form is JPG form, then after having performed this step 202, it is judged that JPG form is not registered, then can
The situation that appearance cannot continue executing with, now, this JPG form is forced to turn by the application by step S203
Change specified file format under certain registered image file type, such as bmp form into, so that grasp
Make method more flexible, prompting that this BLOB type do not registers etc. can also be given further.Additionally use
Family can also relation between the file format of certain BLOB categorical data self-defined, snapshot generating algorithm etc..
In step S205, obtain the system time that these Database Systems are current.
In step S206, it is judged that it is the most identical with this system time that the snapshot preset generates the time, is, then
Perform step S207；No, then turn to this step S205 of execution.
In step S207, according to the snapshot generating algorithm of this correspondence, generate and this BLOB categorical data
Corresponding snapshot.
In step S208, these Database Systems store the snapshot corresponding with this BLOB categorical data,
And store the mapping relations between the snapshot that this BLOB categorical data is corresponding with this.
Specifically, the snapshot creation method of this BLOB categorical data can either automatically or manually trigger generation,
Namely the generation time can be set voluntarily, such as, a snapshot can be pre-set and generate the time, only at this
Snapshot generate the time system time current with place Database Systems identical time, just can trigger generation and this
The snapshot that BLOB categorical data is corresponding, wherein, this system time is place Database Systems current time,
Concrete acquisition mode can utilize the language codes of place Database Systems to obtain, at this not by prior art
Repeat again；If this snapshot generates the time system time current with place Database Systems and differs, then continue
Obtain the system time that Database Systems are current, ought with place Database Systems until generating the time at this snapshot
Trigger when front system time is identical and generate the snapshot corresponding with this BLOB categorical data, concrete such as above-mentioned step
Rapid S205 is to described in 207.Wherein step S201, S204, S207, S208 respectively with above-described embodiment one
Step S101, S102, S103, S104 are identical, do not repeat them here.
Embodiment three:
Fig. 3 shows the reality of the snapshot creation method of the BLOB categorical data that third embodiment of the invention provides
Existing flow process, details are as follows:
In embodiments of the present invention, in based on above-described embodiment one after step S102, step S103 it
Before, or based in above-described embodiment two, step S206 judged result is for being after, before step S207,
The snapshot creation method of this BLOB categorical data also comprises the steps:
In step S301, obtain the size of this BLOB categorical data.
In step s 302, it is judged that whether the size of this BLOB categorical data exceedes predetermined threshold value, is,
Then perform step S303, no, then perform step S204.
In step S303, the snapshot corresponding by this this BLOB categorical data of Database Systems Background scheduling
Generating algorithm, generates the snapshot corresponding with this BLOB categorical data.
In step s 304, according to the snapshot generating algorithm that this BLOB categorical data is corresponding, generate and be somebody's turn to do
The snapshot that BLOB categorical data is corresponding.
In step S305, Database Systems store the snapshot corresponding with this BLOB categorical data,
And store the mapping relations between the snapshot that this BLOB categorical data is corresponding with this.
In specific implementation process, when detecting that certain BLOB categorical data is modified or deleted, can be certainly
The snapshot corresponding with this BLOB categorical data is revised or deleted to dynamic correspondence, such as replaces former with new BLOB
After having BLOB, snapshot corresponding for original BLOB ceases to be in force automatically, and can be according in new BLOB
Holding and generate new snapshot, this new snapshot replaces original snapshot in other words.
In embodiments of the present invention, after the size obtaining BLOB categorical data, by judging this BLOB
Whether the size of categorical data exceedes predetermined threshold value, determines it is should by place Database Systems Background scheduling
The snapshot generating algorithm that BLOB categorical data is corresponding, automatically generates corresponding with this BLOB categorical data fast
According to, or directly according to the snapshot generating algorithm that this BLOB categorical data is corresponding, automatically generate and this BLOB
The snapshot that categorical data is corresponding, such that it is able to process the generation operation of snapshot more flexibly, also will not take
System more time, and during backstage generates snapshot, it is impossible to enough access this BLOB categorical data corresponding
Snapshot, now can also be given relevant backstage generate operation indicating to user etc. so that user understands in time
Situation, other snapshots of preview etc..
One of ordinary skill in the art will appreciate that all or part of step realizing in above-described embodiment method is
Can instruct relevant hardware by program to complete, described program can be stored in a computer-readable
Taking in storage medium, described storage medium, such as ROM/RAM, disk, CD etc..
Embodiment four:
Fig. 4 shows the knot of the snapshot generating means of the BLOB categorical data that fourth embodiment of the invention provides
Structure, for convenience of description, illustrate only the part relevant to the embodiment of the present invention.
The snapshot generating means of this BLOB categorical data may be used for existing relevant database or non-pass
It is in type data base, such as SQL Server2008, My SQL5.5 etc..As shown in Figure 4, this BLOB
The snapshot generating means of categorical data includes: format identification unit 41, algorithm acquiring unit 42, snapshot generate
Unit 43 and memory element 44, wherein:
Format identification unit 41, the file format of BLOB categorical data in identification database system.
Algorithm acquiring unit 42, for the corresponding relation according to the file format preset with snapshot generating algorithm,
Obtain the snapshot generating algorithm corresponding with the file format of this BLOB categorical data.
Wherein, after triggering this format identification unit 41, before triggering this algorithm acquiring unit 42, should
The snapshot generating means of BLOB categorical data also includes:
Whether registration judging unit, be registered literary composition for judging the file format of this BLOB categorical data
Part form；And
Format conversion unit, for registering judging unit output result as time no when this, by this BLOB class
The file format of type data is converted to the file format specified under file format type of the same race.
In embodiments of the present invention, the BLOB categorical data for each insertion Database Systems can lead to
Cross format identification unit 41 and identify its specifically file format.And BLOB categorical data is in Database Systems
Inside is taken as binary data to process, but can be according to the storage content characteristic etc. of binary data
It is identified as the files such as certain file format, such as picture format, audio format, video format, XML format
Various file formats under Format Type.The file format of concrete BLOB categorical data and the identification of correspondence
Method can flexible expansion, user can increase custom file format and recognition methods etc..And then according to
This algorithm acquiring unit 42 corresponding relation based on default file format Yu snapshot generating algorithm, obtains and is somebody's turn to do
The snapshot generating algorithm that the file format of BLOB categorical data is corresponding.
It addition, after triggering this format identification unit 41, it is also possible to being judged by registration judging unit should
Whether the file format of BLOB categorical data is registered file format, when this registration judging unit exports
When result is for being, directly trigger this algorithm acquiring unit 42；And be no when this register judging unit to export result
Time, by this format conversion unit by the file format of this BLOB categorical data be converted to file format of the same race
After the file format specified under type, then carry out follow-up operation such that it is able to obtain arbitrary for greater flexibility
The file format of BLOB categorical data.
Snapshot signal generating unit 43, for the snapshot generating algorithm according to this correspondence, generates and this BLOB type
The snapshot that data are corresponding.
Wherein, with each file format to snapshot generating algorithm can according to user to generate snapshot type,
The requirement of parameter, is arranged voluntarily by user, amendment etc..Such as, related algorithm is set, by picture format
The generation of BLOB categorical data has the image snapshot of certain compression ratio；Lossy Compression Algorithm is set, by sound
Frequently the generation of the BLOB categorical data of form has the audio frequency snapshot of certain compression ratio；Arrange associated compression to calculate
Method, by video snap-shot compressed for the generation of the BLOB categorical data of video format etc..
Before generating the snapshot corresponding with this BLOB categorical data, it is also possible to arranged by parameter definition unit
The generation parameter of snapshot, this generation parameter includes the compression ratio of snapshot, size etc., and now, this snapshot generates
Unit 43 is specifically for the snapshot generating algorithm according to this correspondence, and this generation parameter arranged, generate with
The snapshot that this BLOB categorical data is corresponding, and the compression of snapshot corresponding to this BLOB categorical data generated
Than and size with mate with the compression ratio in this generation parameter and size respectively.Wherein, this journey specifically mated
Degree can be identical, it is also possible to arranges certain range of error, if this BLOB number of types generated
According to the compression ratio of corresponding snapshot and size and the mistake existed with the compression ratio in this generation parameter and size respectively
Difference is in this range of error, then it is assumed that the match is successful, alternatively, it is also possible to arrange this BLOB class of generation
The compression ratio of the snapshot that type data are corresponding and size are less than and the compression ratio in this generation parameter and size respectively
Deng, can arrange the most flexibly, do not limit at this.
In embodiments of the present invention, the time generating the snapshot corresponding with this BLOB categorical data can be root
Automatically trigger control according to the default snapshot generation time etc., it is also possible to in-time generatin, can set as required
Put.Such as, raw at the snapshot that the file format and this document form that obtain arbitrary BLOB categorical data are corresponding
After becoming algorithm, before generating the snapshot corresponding with this BLOB categorical data, the snapshot of this BLOB categorical data
Generating means can also include time judging unit and result treatment unit, it is achieved that the self-defined snapshot that arranges is given birth to
The purpose of one-tenth time, wherein:
Time judging unit, for obtaining the system time that these Database Systems are current, and judges to preset snapshot
The generation time is the most identical with this number system time；And
Result treatment unit, for when this time judging unit output result is for being, triggering this snapshot immediately
Signal generating unit；Otherwise, this time judging unit of repeated trigger, until this snapshot preset generates time and institute
The system time stating Database Systems current is identical.
Memory element 44, for storing the snapshot corresponding with this BLOB categorical data in these Database Systems,
And store the mapping relations between the snapshot that this BLOB categorical data is corresponding with this.
In embodiments of the present invention, corresponding with the snapshot generating means of this BLOB categorical data snapshot generates
Method is shown in above-described embodiment one to three, does not repeats them here.
The snapshot generating means of the BLOB categorical data by providing in the embodiment of the present invention four, it is possible to counting
Automatically generate and store the snapshot of BLOB categorical data according to storehouse internal system, and BLOB categorical data is with right
Association storage between the snapshot answered is fully transparent to user, solves the data super large in BLOB type,
Need the high delay problem caused during the snapshot of its correspondence of preview, it is achieved that by single snapshot access interface,
Quickly access the purpose of snapshot, and, when detecting that this BLOB categorical data is deleted, it is also possible to logical
Cross edit cell correspondence and delete the snapshot corresponding with this BLOB categorical data, and this BLOB categorical data
Mapping relations snapshot between corresponding with this, then in the premise not increasing database user extra work amount
Under, achieve solution snapshot and the consistency problem of initial data by data store internal.
Embodiment five:
Fig. 5 shows the knot of the snapshot generating means of the BLOB categorical data that fifth embodiment of the invention provides
Structure, for convenience of description, illustrate only the part relevant to the embodiment of the present invention.
Snapshot generating means structure based on the BLOB categorical data gone out given in above-described embodiment four, such as figure
Shown in 5, in the embodiment of the present invention, the snapshot generating means of this BLOB categorical data includes: format identification list
Unit 51, algorithm acquiring unit 52, acquiring unit 53, judging unit 54, snapshot signal generating unit 55 and storage
Unit 56, this format identification unit 51, algorithm acquiring unit 52, memory element 56 respectively with above-mentioned enforcement
In example four, format identification unit 41, algorithm acquiring unit 42, memory element 44 one_to_one corresponding, identical.
Now the snapshot generating means of this BLOB categorical data may be used for existing system R or
In non-relational database system, wherein:
Acquiring unit 53, for obtaining the size of this BLOB categorical data.
Judging unit 54, for judging whether the size of this BLOB categorical data exceedes predetermined threshold value.
Now, snapshot signal generating unit 55 is specifically for judging this BLOB number of types when this judging unit 53
According to size exceed predetermined threshold value time, trigger this BLOB categorical data of this Database Systems Background scheduling corresponding
Snapshot generating algorithm, generate the snapshot corresponding with this BLOB categorical data；When this judging unit 53 is sentenced
When the size this BLOB categorical data of breaking is not less than predetermined threshold value, corresponding according to this BLOB categorical data
Snapshot generating algorithm, generate the snapshot corresponding with this BLOB categorical data.
By the device provided in the embodiment of the present invention five, this acquiring unit 53 obtains BLOB categorical data
Size after, it is judged that unit 54 judges whether the size of this BLOB categorical data exceedes predetermined threshold value, touch
Send out snapshot signal generating unit 55 determines it is by the snapshot generating algorithm of Database Systems this correspondence of Background scheduling, from
The snapshot that dynamic generation is corresponding with this BLOB categorical data, or directly according to the snapshot generating algorithm of this correspondence,
Automatically generate the snapshot corresponding with this BLOB categorical data, the generation behaviour of snapshot can be processed more flexibly
Make, also will not take system more time, and during backstage generates snapshot, it is impossible to enough access this BLOB
The snapshot that categorical data is corresponding, now can also be given relevant backstage generate operation indicating to user etc. so that
Obtain user to go and find out what's going in time, other snapshots of preview etc..
The file format automatic identification algorithm of the BLOB categorical data that the embodiment of the present invention is preset by basis,
Automatically the file format of BLOB categorical data in identification database system, according to default file format with fast
According to the corresponding relation of generating algorithm, automatically obtain the snapshot corresponding with the file format of this BLOB categorical data
Generating algorithm, further according to corresponding snapshot generating algorithm, automatically generates corresponding with this BLOB categorical data
Snapshot, and store, in Database Systems internal correlation, the snapshot that this BLOB categorical data is corresponding with this, and
Store the mapping relations between the snapshot that this BLOB categorical data is corresponding with this, it is achieved that the most saturating to user
Bright, but also can custom file format, recognizer and snapshot generating algorithm etc. according to actual needs,
Generation method is relatively more flexible, and when client needs the snapshot returning a certain BLOB categorical data, directly
Returned the required snapshot previously generated by snapshot access interface, reduce snapshot response time delay.It addition, by
In need not the snapshot that increase complexity is higher between data base and application program process as prior art
Generation module, it is not required that handle the relation of client-cache and snapshot well, also reduces complexity and exploitation
Workload.
It should be noted that combine unit and the algorithm steps of each example that the embodiments described herein describes
Suddenly, it is possible to electronic hardware, computer software or the two be implemented in combination in, hard in order to clearly demonstrate
Part and the interchangeability of software, the most generally describe the group of each example according to function
Become and step.These functions perform with hardware or software mode actually, depend on the specific of technical scheme
Application and design constraint.Each specifically should being used for can be used different methods to by professional and technical personnel
Function described by realization, but this realization is it is not considered that beyond the scope of this invention.
The method described in conjunction with the embodiments described herein or the step of algorithm can use hardware, processor
The software module performed, or the combination of the two implements.Software module can be placed in random access memory
(RAM), internal memory, read only memory (ROM), electrically programmable ROM, electrically erasable ROM,
Other form any well known in depositor, hard disk, moveable magnetic disc, CD-ROM or technical field
Storage medium in.
Above-described detailed description of the invention, is carried out the purpose of the present invention, technical scheme and beneficial effect
Further describe, be it should be understood that the detailed description of the invention that the foregoing is only the present invention,
The protection domain being not intended to limit the present invention, all within the spirit and principles in the present invention, that is done is any
Amendment, equivalent, improvement etc., should be included within the scope of the present invention.
Claims (8)
1. the snapshot creation method of a binary large object BLOB categorical data, it is characterised in that described method includes:
The file format of BLOB categorical data in identification database system；
According to the corresponding relation of default file format Yu snapshot generating algorithm, obtain the snapshot generating algorithm corresponding with the file format of described BLOB categorical data；
Snapshot generating algorithm according to described correspondence, generates the snapshot corresponding with described BLOB categorical data；
In described Database Systems, store the snapshot corresponding with described BLOB categorical data, and store the mapping relations between described BLOB categorical data with described corresponding snapshot；
The snapshot receiving snapshot corresponding to BLOB categorical data described in the acquisition request that client sends obtains request, and described snapshot obtains request and includes the mark of described BLOB categorical data；
The mark of BLOB categorical data described in request is obtained according to described snapshot, and mapping relations between described BLOB categorical data and the described corresponding snapshot of storage in described Database Systems, in described Database Systems, inquiry obtains described BLOB categorical data and described corresponding snapshot, and by the snapshot access interface preset, snapshot corresponding for described BLOB categorical data is sent to described client；
Described method also includes:
When detecting that BLOB categorical data is modified or deleted, the most corresponding amendment or the deletion snapshot corresponding with this BLOB categorical data and corresponding mapping relations.
2. the method for claim 1, it is characterised in that before the snapshotting step that described generation is corresponding with described BLOB categorical data, described method also includes:
Obtain the system time that described Database Systems are current, and it is the most identical with described system time to judge that the snapshot preset generates the time；
If it is, perform the described snapshot generating algorithm according to described correspondence, generate the step of the snapshot corresponding with described BLOB categorical data；If not, then repeat the system time that the described Database Systems of described acquisition are current, and judge that described default snapshot generates the time step the most identical with described system time, until described default snapshot to generate the time system time current with described Database Systems identical.
3. the method for claim 1, it is characterised in that before the step of the described generation snapshot corresponding with described BLOB categorical data, described method also includes:
Obtain the size of described BLOB categorical data；
Judge whether the size of described BLOB categorical data exceedes predetermined threshold value；
The described snapshot generating algorithm according to described correspondence, generates the snapshot corresponding with described BLOB categorical data, including:
When the size of described BLOB categorical data exceedes predetermined threshold value, the snapshot generating algorithm corresponding by BLOB categorical data described in described Database Systems Background scheduling, generate the snapshot corresponding with described BLOB categorical data；
When the size of described BLOB categorical data is not less than predetermined threshold value, according to the snapshot generating algorithm that described BLOB categorical data is corresponding, generate the snapshot corresponding with described BLOB categorical data.
4. the method for claim 1, it is characterised in that before the step of the described generation snapshot corresponding with described BLOB categorical data, described method also includes:
Arranging the generation parameter of snapshot, described generation parameter includes the compression ratio of snapshot, size；
The described snapshot generating algorithm according to described correspondence, generates the snapshot corresponding with described BLOB categorical data, including:
Snapshot generating algorithm according to described correspondence, and the described generation parameter arranged, generate the snapshot corresponding with described BLOB categorical data, and the compression ratio of snapshot corresponding to the described BLOB categorical data that generates and size with mate with the compression ratio in described generation parameter and size respectively.
5. the snapshot generating means of a binary large object BLOB categorical data, it is characterised in that described device includes:
Format identification unit, the file format of BLOB categorical data in identification database system；
Algorithm acquiring unit, for the corresponding relation according to the file format preset with snapshot generating algorithm, obtains the snapshot generating algorithm corresponding with the file format of described BLOB categorical data；
Snapshot signal generating unit, for the snapshot generating algorithm according to described correspondence, generates the snapshot corresponding with described BLOB categorical data；And
Memory element, for storing the snapshot corresponding with described BLOB categorical data in described Database Systems, and stores the mapping relations between described BLOB categorical data with described corresponding snapshot；
Receiving unit, obtain request for receiving the snapshot of snapshot corresponding to BLOB categorical data described in the acquisition request that client sends, described snapshot obtains request and includes the mark of described BLOB categorical data；
Transmitting element, for obtaining the mark of BLOB categorical data described in request according to described snapshot, and mapping relations between described BLOB categorical data and the described corresponding snapshot of storage in described Database Systems, in described Database Systems, inquiry obtains described BLOB categorical data and described corresponding snapshot, and by the snapshot access interface preset, snapshot corresponding for described BLOB categorical data is sent to described client；
Described device also includes:
Edit cell, for when detecting that BLOB categorical data is modified or deleted, correspondence is revised or deletes the snapshot corresponding with this BLOB categorical data and corresponding mapping relations automatically.
6. device as claimed in claim 5, it is characterised in that described device also includes:
Time judging unit, for obtaining the system time that described Database Systems are current, and it is the most identical with described system time to judge that the snapshot preset generates the time；And
Result treatment unit, for when described time judging unit output result is for being, triggering described snapshot signal generating unit immediately；Otherwise, time judging unit described in repeated trigger, until described default snapshot to generate the time system time current with described Database Systems identical.
7. the device as described in claim 5 or 6, it is characterised in that described device also includes:
Acquiring unit, for obtaining the size of described BLOB categorical data；
Judging unit, for judging whether the size of described BLOB categorical data exceedes predetermined threshold value；
Described snapshot signal generating unit, during specifically for judging that when described judging unit the size of described BLOB categorical data exceedes predetermined threshold value, trigger the snapshot generating algorithm that BLOB categorical data described in described Database Systems Background scheduling is corresponding, generate the snapshot corresponding with described BLOB categorical data；When described judging unit judges the size of described BLOB categorical data not less than predetermined threshold value, according to the snapshot generating algorithm that described BLOB categorical data is corresponding, generate the snapshot corresponding with described BLOB categorical data.
8. the device as described in claim 5 or 6, it is characterised in that described device also includes:
Parameter definition unit, for arranging the generation parameter of snapshot, described generation parameter includes the compression ratio of snapshot, size；
Described snapshot signal generating unit, specifically for the snapshot generating algorithm according to described correspondence, and the described generation parameter arranged, generate the snapshot corresponding with described BLOB categorical data, and the compression ratio of snapshot corresponding to the described BLOB categorical data that generates and size with mate with the compression ratio in described generation parameter and size respectively.
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| CN101344881A (en) * | 2007-07-09 | 2009-01-14 | 中国科学院大气物理研究所 | Index generation method and device and search system for mass file type data |
| CN102043830A (en) * | 2010-11-17 | 2011-05-04 | 北京握奇数据系统有限公司 | Method and device for processing BLOB (Binary Large Object) type data and intelligent card |
| CN102841918A (en) * | 2012-06-29 | 2012-12-26 | 用友软件股份有限公司 | Method and device for processing binary system long-object fluidized data |
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| CN101080715A (en) * | 2004-12-15 | 2007-11-28 | 皇家飞利浦电子股份有限公司 | System and method for managing binary large objects |
| CN101344881A (en) * | 2007-07-09 | 2009-01-14 | 中国科学院大气物理研究所 | Index generation method and device and search system for mass file type data |
| CN102043830A (en) * | 2010-11-17 | 2011-05-04 | 北京握奇数据系统有限公司 | Method and device for processing BLOB (Binary Large Object) type data and intelligent card |
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