CN102567528A - Method and device for reading mass data - Google Patents
Method and device for reading mass data Download PDFInfo
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- CN102567528A CN102567528A CN2011104531519A CN201110453151A CN102567528A CN 102567528 A CN102567528 A CN 102567528A CN 2011104531519 A CN2011104531519 A CN 2011104531519A CN 201110453151 A CN201110453151 A CN 201110453151A CN 102567528 A CN102567528 A CN 102567528A
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Abstract
The embodiment of the invention discloses a method and a device for reading mass data. The method comprises the following steps of: i) acquiring the mass data to be read; ii) acquiring the name of an appointed field and sequencing all records according to the appointed field; iii) acquiring an initial position and the number of records to be pre-read; iv) pre-reading the records with the number from the initial position and taking the records as the current data segment; v) traversing the value of the appointed field of each record in the current data segment from rear to front to acquire a final position, namely the position of the record about the change of the value of the appointed field; and vi) taking the record between the initial position and the final position as a data segment, officially reading, taking the position of the next record of the record at the final position as a new initial position, and performing the step iii). The initial position and the final position of each data segment can be dynamically adjusted when the mass data is read by segments, so that the integrity of each data segment is ensured.
Description
Technical field
The present invention relates to data processing field, especially relate to a kind of method and device that reads mass data.
Background technology
In productive life, often need to make various forms.In generation, when showing form; Inevitably can run into reading and the demonstration problem of mass data; In other words, related data are several ten thousand at least in the form, at most hundreds of thousands even up to a million; Data more than how inciting somebody to action so correctly read internal memory and then are presented on the interface, are the challenges that each form product is faced.
The related mass data of form generally all is to be stored in lane database.In the prior art; Normally the data database data being carried out segmentation (or claiming in batches) when generating form reads; The data of fixed qty in each reading database; Such as data to be read in the database is 100,000, reads 5000 and demonstration at every turn, then reads altogether can all data be read for 20 times to finish.The problem that the mode of using this segmentation to read can avoid the disposable internal memory that reads total data and cause to overflow.
The inventor is in realizing process of the present invention; Find that there is following shortcoming at least in prior art: when there is association in some data; This mode that reads by the fixed qty segmentation may be separated with these related data; Make the destroy integrity of data, thereby cause when processing such as adding up, gather, occurring mistake.For example, store many city records in the database, simultaneously each bar record is divided into groups according to affiliated area, as shown in table 1:
Table 1
| The area | The city | Branch office | The sales volume |
| North China | Beijing | BJ | 3 |
| Northeast | Dalian | DL | 2 |
| Northeast | Shenyang | SY | 1 |
When reading first segment data, possibly only read preceding two records, obtain result as shown in table 2 when then carrying out subtotal:
Table 2
When reading second segment data, just read the 3rd record, obtain result as shown in table 3 when then carrying out subtotal:
Table 3
It is thus clear that in the prior art, when reading many records, will belong to the data of dividing into groups in northeast and force separately so not only subtotal have been carried out in the city of the Northeast twice, and because only added up a part of data at every turn, so the result of subtotal also is incorrect.
Again for example, store many salary records in the database, as shown in table 4:
Table 4
| Name | Kind | The amount of money | Month |
| Zhang San | Wage | 2000 | November |
| Zhang San | Bonus | 800 | November |
| Zhang San | Meal is mended | 200 | November |
| Zhang San | Traffic is mended | 150 | November |
| Li Si | Wage | 3000 | November |
| Li Si | Bonus | 500 | November |
| Li Si | Meal is mended | 250 | November |
| Li Si | Traffic is mended | ?100 | November |
When reading first segment data, possibly only read the first six bar record, then can be intersected summary sheet (in this table many records in the corresponding original table of record), i.e. table 5 as follows by name:
Table 5
When reading second segment data, just read back two records, intersected summary sheet, i.e. table 6 as follows:
Table 6
It is thus clear that the wage of " Li Si " has been added up to twice, such result obviously is wrong, and the user can't accept.
Summary of the invention
The technical matters that the embodiment of the invention will solve is: when mass data is read in segmentation, and the problem of the destroy integrity of data.
The embodiment of the invention provides a kind of method that reads mass data, may further comprise the steps:
I) obtain mass data to be read, said mass data comprises many records, and every said record comprises some fields;
Ii) obtain the title of specific field in the said mass data, and all records in the said mass data are sorted by said specific field, so that the identical record of said designated word segment value is adjacent;
The quantity of reference position when iii) obtaining from said mass data reading of data and the record that will read in advance;
Iv) the said reference position from said mass data read said quantity in advance record as the current data section;
V) in said current data section, by from after forward order the value of the said specific field of each bar record is traveled through, obtaining end position, said end position is the position of the record that changes of the value of said specific field;
Vi) the record between said reference position and the said end position is formally read as one piece of data, and with the position of next bar record of the record at said end position place as new reference position, get into step I ii).
Preferably, step v) specifically comprises:
A, with the last item of said current data section record as current record;
B, judge whether the value of said specific field of a current record and a last record thereof identical, if identical, then with the last record of said current record as new current record, repeating step b; If different, the position of a last record that then obtains said current record is as end position.
Preferably, step I is v) afterwards further comprising the steps of:
Judge after the said current data section whether also have follow-up data, then continue to carry out,, then the current data section is formally read and withdraws from as one piece of data if do not have if having.
Preferably, judge that whether said current data section also has the step of follow-up data afterwards, specifically comprises:
A, read some records after the said current data section as redundant recording;
B, judge whether article one record of said redundant recording is empty, if then judging does not have trailer record, if not, then judging has trailer record.
Preferably, described in the steps A some be specially one.
The embodiment of the invention also provides a kind of device that reads mass data, comprising:
The data preparatory unit is used to obtain mass data to be read, and said mass data comprises many records, and every said record comprises some fields;
Pretreatment unit is used for obtaining the title of said mass data specific field, and all records in the said mass data are sorted by said specific field, so that the identical record of said designated word segment value is adjacent;
The starting point acquiring unit, the quantity of reference position when being used for obtaining and the record that will read in advance from said mass data reading of data;
Read the unit in advance, the record that is used for reading said quantity in advance from the said reference position of said mass data is as the current data section;
The ending acquiring unit is used in said current data section, by from after forward order the value of the said specific field of each bar record is traveled through, obtaining end position, said end position is the position of the record that changes of the value of said specific field;
Formal reading unit is used for the record between said reference position and the said end position is formally read as one piece of data, and the position that next bar of the record at said end position place is write down is as new reference position.
Preferably, said ending acquiring unit specifically comprises:
Initialization subelement: be used for the last item of said current data section is write down as current record;
The cycle criterion subelement: whether the value of said specific field that is used to judge a current record and a last record thereof is identical; If identical, then with the last record of said current record as new current record, continue to judge whether the value of said specific field of a current record and a last record thereof identical; If different, the position of a last record that then obtains said current record is as end position.
Preferred described device can also comprise:
The follow-up data judging unit is used to judge after the said current data section whether also have follow-up data, if then do not call end unit;
Said end unit is used for the current data section is formally read and withdraws from as one piece of data.
Preferably, said follow-up data judging unit specifically comprises:
Follow-up data reads subelement, is used to read said current data section some records afterwards as redundant recording;
The follow-up data judgment sub-unit is used to judge whether article one record of said redundant recording is empty, if not, then calls end unit.
Preferred said some are specially one.
The method and apparatus of the embodiment of the invention; When mass data is read in segmentation; Through using the integrity field technology dynamically to adjust the reference position and the end position of every segment data, thereby guaranteed the integrality of every segment data, made that processing such as adding up, gather can obtain correct result.In addition, solved and to have foreseen the follow-up problem that whether also has data through reading redundant recording.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the process flow diagram of the embodiment of the invention one method;
Fig. 2 is the process flow diagram of the embodiment of the invention two methods;
Fig. 3 is the embodiment of the invention three schematic representation of apparatus.
Embodiment
To combine the accompanying drawing in the embodiment of the invention below, the technical scheme in the embodiment of the invention is carried out clear, intactly description, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
Embodiment one
Fig. 1 is the process flow diagram of the embodiment of the invention one method, may further comprise the steps:
S101: obtain mass data to be read, said mass data comprises many records, and every said record comprises some fields;
S102: obtain the title of specific field in the said mass data, and all records in the said mass data are sorted by said specific field, so that the identical record of said designated word segment value is adjacent;
S103: the quantity of reference position when obtaining from said mass data reading of data and the record that will read in advance;
S104: the said reference position from said mass data reads the record of said quantity in advance as the current data section;
S105: in said current data section, by from after forward order the value of the said specific field of each bar record is traveled through, obtaining end position, said end position is the position of the record that changes of the value of said specific field;
S106: the record between said reference position and the said end position is formally read as one piece of data, and with the position of next bar record of the record at said end position place as new reference position, get into S103.
Embodiment two
Fig. 2 is the process flow diagram of the embodiment of the invention two methods, may further comprise the steps:
S201: obtain mass data.Obtaining mass data specifically can be the position that obtains mass data, for example address on disk etc.Mass data is the earning record data of the magnanimity of lane database storage in the present embodiment, and every earning record comprises fields such as " name ", " wage ", " bonus ".
S202: select " name " field as integrity field.Integrity field is a specific field.
S203: sort by " name ".Make all names be one group on the record record next-door neighbour composition form of " Li Si " for one group on the record of " Zhang San " the next-door neighbour composition form, all names, or the like.After ordering, be equivalent to divide into groups by name, only guaranteed otherwise this component is cut then each bar record of this name just can not cut apart.
S204: establish x=1, m=500.The effect of this step is that x and m are carried out initialization.M is the quantity of each record that reads in advance in the present embodiment, and promptly the length of each pre-reading data section is fixed value.The position of article one record that x reads when reading in advance at every turn in advance also is the reference position of each pre-reading data section, simultaneously also as the reference position of the data segment that formally reads.
S205: the record of the m bar between the x to y is read in internal memory in advance as the pre-reading data section, and as current data section, wherein y=x-m+1.It should be noted that under situation about having begin to read m bar when record from x, the data of possible x back are the m bar not enough, m becomes the bar number of the actual record that reads at this moment.
S206: judge after the y whether also have follow-up data,, then get into S208 if having if then do not get into S207.This step is an optional step.In other embodiment of the present invention, can when reading the sky data segment in advance, withdraw from flow process in this case automatically and get final product not to whether also having follow-up data to judge after the y.
S207: the record between the x to y is formally read and withdraw from flow process as one piece of data.
S208: obtain the value a of " name " field of y bar record, for example a=Li Si.
S209:i=1, wherein i is an interim counting variable.The effect of this step is that i is carried out initialization.
S210: obtain the value b of " name " field of y-i bar record, for example b=Zhang San.
S211: judge whether b equals a.If then get into S212.If not, then change has taken place in the value of representative " name " field herein, and the end position of the data segment that y-i promptly need formally read gets into S213.Noting, in the present embodiment y and y-i " name " field are compared, in other embodiment of the present invention, is 0 in the time of can also making i initial, searches the position of having sent out change through y-i and y-i-1 are compared at every turn.
S212:i=i+1 continues to carry out S210.
S213: the record between the x to y-i is formally read.After formally reading, can also have the record between this x to y-i outputed on the screen to show, or export the medium step of other storeies to.
S214：x＝y-i+1。Be about to the reference position of the position of next bar record of y-i as next pre-reading data section, S205 is carried out in circulation then.
In addition, preferred step S206 can specifically may further comprise the steps:
S2061: read said current data section n bar record afterwards as redundant recording, promptly read y+1～y+n bar and write down, wherein n >=1 as redundant recording.Preferred n=1 in the present embodiment.
S2062: article one record of judging said redundant recording is whether y+1 bar record is empty, if then judging does not have trailer record, if not, then judging has trailer record.
Embodiment three
Fig. 3 is the embodiment of the invention three schematic representation of apparatus, comprising:
Data preparatory unit 301 is used to obtain mass data to be read, and said mass data comprises many records, and every said record comprises some fields;
Starting point acquiring unit 303, the quantity of reference position when being used for obtaining and the record that will read in advance from said mass data reading of data;
Read unit 304 in advance, the record that is used for reading said quantity in advance from the said reference position of said mass data is as the current data section;
Ending acquiring unit 305 is used in said current data section, by from after forward order the value of the said specific field of each bar record is traveled through, obtaining end position, said end position is the position of the record that changes of the value of said specific field;
Preferably, said ending acquiring unit 305 specifically comprises:
Initialization subelement: be used for the last item of said current data section is write down as current record;
The cycle criterion subelement: whether the value of said specific field that is used to judge a current record and a last record thereof is identical; If identical, then with the last record of said current record as new current record, continue to judge whether the value of said specific field of a current record and a last record thereof identical; If different, the position of a last record that then obtains said current record is as end position.
Preferred said device can also comprise:
The follow-up data judging unit is used to judge after the said current data section whether also have follow-up data, if then do not call end unit;
End unit is used for the current data section is formally read and withdraws from as one piece of data.
Preferably, said follow-up data judging unit specifically can comprise:
Follow-up data reads subelement, is used to read said current data section some records afterwards as redundant recording;
The follow-up data judgment sub-unit is used to judge whether article one record of said redundant recording is empty, if not, then calls end unit.
Preferred said some are specially one.
For device embodiment, because it is basically similar in appearance to method embodiment, so description is fairly simple, relevant part gets final product referring to the part explanation of method embodiment.
Need to prove; In this article; Relational terms such as first and second grades only is used for an entity or operation are made a distinction with another entity or operation, and not necessarily requires or hint relation or the order that has any this reality between these entities or the operation.And; Term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability; Thereby make and comprise that process, method, article or the equipment of a series of key elements not only comprise those key elements; But also comprise other key elements of clearly not listing, or also be included as this process, method, article or equipment intrinsic key element.Under the situation that do not having much more more restrictions, the key element that limits by statement " comprising ... ", and be not precluded within process, method, article or the equipment that comprises said key element and also have other identical element.
One of ordinary skill in the art will appreciate that all or part of step that realizes in the said method embodiment is to instruct relevant hardware to accomplish through program; Described program can be stored in the computer read/write memory medium; Here the alleged storage medium that gets, as: ROM/RAM, magnetic disc, CD etc.
The above is merely preferred embodiment of the present invention, is not to be used to limit protection scope of the present invention.All any modifications of within spirit of the present invention and principle, being done, be equal to replacement, improvement etc., all be included in protection scope of the present invention.
Claims (10)
1. a method that reads mass data is characterized in that, may further comprise the steps:
I) obtain mass data to be read, said mass data comprises many records, and every said record comprises some fields;
Ii) obtain the title of specific field in the said mass data, and all records in the said mass data are sorted by said specific field, so that the identical record of said designated word segment value is adjacent;
The quantity of reference position when iii) obtaining from said mass data reading of data and the record that will read in advance;
Iv) the said reference position from said mass data read said quantity in advance record as the current data section;
V) in said current data section, by from after forward order the value of the said specific field of each bar record is traveled through, obtaining end position, said end position is the position of the record that changes of the value of said specific field;
Vi) the record between said reference position and the said end position is formally read as one piece of data, and with the position of next bar record of the record at said end position place as new reference position, get into step I ii).
2. method according to claim 1 is characterized in that step v) specifically comprises:
A, with the last item of said current data section record as current record;
B, judge whether the value of said specific field of a current record and a last record thereof identical, if identical, then with the last record of said current record as new current record, repeating step b; If different, the position of a last record that then obtains said current record is as end position.
3. method according to claim 1 is characterized in that, step I is v) afterwards further comprising the steps of:
Judge after the said current data section whether also have follow-up data, then continue to carry out,, then the current data section is formally read and withdraws from as one piece of data if do not have if having.
4. method according to claim 3 is characterized in that, judges that whether said current data section also has the step of follow-up data afterwards, specifically comprises:
A, read some records after the said current data section as redundant recording;
B, judge whether article one record of said redundant recording is empty, if then judging does not have trailer record, if not, then judging has trailer record.
5. method according to claim 4 is characterized in that, some are specially one described in the steps A.
6. a device that reads mass data is characterized in that, comprising:
The data preparatory unit is used to obtain mass data to be read, and said mass data comprises many records, and every said record comprises some fields;
Pretreatment unit is used for obtaining the title of said mass data specific field, and all records in the said mass data are sorted by said specific field, so that the identical record of said designated word segment value is adjacent;
The starting point acquiring unit, the quantity of reference position when being used for obtaining and the record that will read in advance from said mass data reading of data;
Read the unit in advance, the record that is used for reading said quantity in advance from the said reference position of said mass data is as the current data section;
The ending acquiring unit is used in said current data section, by from after forward order the value of the said specific field of each bar record is traveled through, obtaining end position, said end position is the position of the record that changes of the value of said specific field;
Formal reading unit is used for the record between said reference position and the said end position is formally read as one piece of data, and the position that next bar of the record at said end position place is write down is as new reference position.
7. device according to claim 6 is characterized in that, said ending acquiring unit specifically comprises:
Initialization subelement: be used for the last item of said current data section is write down as current record;
The cycle criterion subelement: whether the value of said specific field that is used to judge a current record and a last record thereof is identical; If identical, then with the last record of said current record as new current record, continue to judge whether the value of said specific field of a current record and a last record thereof identical; If different, the position of a last record that then obtains said current record is as end position.
8. device according to claim 6 is characterized in that, also comprises:
The follow-up data judging unit is used to judge after the said current data section whether also have follow-up data, if then do not call end unit;
Said end unit is used for the current data section is formally read and withdraws from as one piece of data.
9. device according to claim 8 is characterized in that, said follow-up data judging unit specifically comprises:
Follow-up data reads subelement, is used to read said current data section some records afterwards as redundant recording;
The follow-up data judgment sub-unit is used to judge whether article one record of said redundant recording is empty, if not, then calls end unit.
10. device according to claim 9 is characterized in that said some are specially one.
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| CN110908972A (en) * | 2019-11-19 | 2020-03-24 | 加和（北京）信息科技有限公司 | Log data preprocessing method and device, electronic equipment and storage medium |
| CN111178101A (en) * | 2019-12-31 | 2020-05-19 | 展讯通信（上海）有限公司 | Recording reading method, recording reading device and storage medium |
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| CN102567528B (en) | 2014-01-29 |
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