CN107102973A - The data extraction method and system of a kind of CSV formatted files - Google Patents
The data extraction method and system of a kind of CSV formatted files Download PDFInfo
- Publication number
- CN107102973A CN107102973A CN201710154309.XA CN201710154309A CN107102973A CN 107102973 A CN107102973 A CN 107102973A CN 201710154309 A CN201710154309 A CN 201710154309A CN 107102973 A CN107102973 A CN 107102973A
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- character
- file
- quotation marks
- csv
- formatted files
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F40/00—Handling natural language data
- G06F40/10—Text processing
- G06F40/12—Use of codes for handling textual entities
- G06F40/126—Character encoding
Abstract
The invention discloses a kind of data extraction method of CSV formatted files and system, methods described comprises the following steps：Each character of the CSV formatted files is traveled through in order；Only when the character is end of file and quotation marks mark is closed, just assert that the CSV formatted files extract the format error that the CSV formatted files are successfully assert if the character is end of file but quotation marks identifier is not turned off.The method and system of the present invention are simple efficiently understandable, to greatest extent conclude the processing of a variety of special circumstances into several steps, and can easily apply in various software system developments, and across programming language can be applied；In addition, the autgmentability of the present invention is also very strong, other literal code form can be expanded to.
Description
Technical field
The present invention relates to a kind of domain name trustship technical field, and in particular to a kind of number based on the UTF-8 CSV forms encoded
According to extracting method and system.
Background technology
In domain name trustship field, registrar can be transferred to registration office with the file of CSV forms, and registration office need to extract these
The field value of csv file form and verification, and the coded format of file is defined as UTF-8 forms.UTF-8(8-bit Unicode
Transformation Format) it is a kind of variable length character coding for Unicode, also known as Unicode.By Ken
Thompson was created in 1992.RFC 3629 has been standardized as it now.UTF-8 is with 1 to 4 byte code Unicode words
Symbol.Simplified Chinese character traditional font and other Languages are shown with the page can be unified on webpage (such as English, Japanese, Korean).
For comma separated value (Comma-Separated Values, CSV) text, its file is stored with plain text
List data (numeral and text).Plain text means that this document is a character string, without must as binary digit that
The interpreted data of sample.Csv file is made up of any number of record, is separated between record with CRLF newlines；Every record by
Field is constituted, and the separator of interfield is comma, and all records have identical field sequence.
Csv file be a computer data file be used for perform trial and real organization tool, CSV it is clear
It is single.Csv file is listed in the form of the data structure table of stored digital, and related item (member) is organized with other (members) by teasing
Number separate.Row in form is capable corresponding with csv file.Colleague's field CSV.Csv file is typically used at two
Mobile list data, such as relational database software and spreadsheet program between different computer programs.
The similar excel forms of CSV, each multiple row of record point, certain row row specified are a cells, but often
It can also be entered a new line in individual cell.For this form have it is following some should be noted：
1st, it there may be newline in certain column unit lattice in every record.So traversal when, it is necessary to pay special attention to be
No one record of real completion.
If the 2, needing to show double quotation marks in cell field, double quotation marks is needed to use to carry out escape, i.e., " " represent one
Individual quotation marks, and the field must also be caused next by double quotation marks.
3rd, CSV forms, if needing to show comma in cell, are needed also exist for the field double quotation marks with CSV
Introduce, but single double quotation marks can not be appeared alone in field, such as：
Correct form citing：Abc,”abc,abc”,123；
The form citing of mistake：Abc,abc”,”abc,123.
Therefore, when being extracted for the file content obtained after transmission, it is desirable to which a kind of effective method is completed,
To distinguish the data of each cell.
The content of the invention
For solve problem above, the present invention devise it is a kind of based on UTF-8 encode CSV forms data extraction method and
System, is extracted for the file content obtained after transmission, can distinguish the data of each cell.
Specifically, the invention discloses a kind of data extraction method of CSV formatted files, comprising the following steps：
Each character of the CSV formatted files is traveled through in order；
Only when the character is end mark and quotation marks mark is closed, just assert that the CSV formatted files are extracted into
Work(, if worked as, the character is end of file but quotation marks mark is not turned off, and assert that the form of the CSV formatted files is wrong
By mistake.
It is preferred that, the data extraction method of CSV formatted files as described above, when the character be double quotation marks and this draw
Number it is that when closing symbol, the character late of file is obtained in order.
It is preferred that, the data extraction method of CSV formatted files as described above, when the character be double quotation marks and this draw
Number it is not that when closing symbol, if the previous character of the character is comma, quotation marks or sky, the next of file is obtained in order
Character.
It is preferred that, the data extraction method of CSV formatted files as described above, when the character be comma or newline simultaneously
And during quotation marks mark closing, first acquiring unit lattice field value, then the character late of file is obtained in order.
It is preferred that, the data extraction method of CSV formatted files as described above, when the character be comma or newline simultaneously
And quotation marks are identified when being not turned off, and the character late of file is directly obtained in order.
It is preferred that, the data extraction method of CSV formatted files as described above, the cell is the list where the character
First lattice.
It is preferred that, the data extraction method of CSV formatted files as described above, if the character is not end mark, double drawn
Number, any one in comma, newline, then directly obtain the character late of file in order.
According to another aspect of the present invention, a kind of data extraction method of CSV formatted files is additionally provided, including it is as follows
Step：
(1), obtain CSV formatted files a character, and judge the character whether end of file；If the character is
End of file then enters step (2), and step (3) is entered if the character is not end of file；
(2), judge that quotation marks identify whether closing, assert that the csv file form is wrong if quotation marks mark is not turned off
By mistake, assert that the csv file is extracted successfully if quotation marks mark is closed；
(3), judge the character whether double quotation marks, if the character is double quotation marks enter step (4), if the character is not
It is that double quotation marks then enters step (5)；
(4) whether be close symbol, the character late of file is if it is obtained in order, into step if, judging the quotation marks
Suddenly (1), if otherwise entering step (8)；
(5), judge the character whether comma, if yes then enter step (6), if otherwise enter step (7)；
(6), judge that quotation marks identify whether closing, if it is first acquiring unit lattice field value, then obtain file in order
Character late, into step (1), if otherwise directly in order obtain file character late, into step (1)；
(7), judge the character whether newline, if yes then enter step (6), if otherwise obtaining file in order
Character late, into step (1)；
(8), judge the character previous character whether comma, quotation marks or sky, file is if it is obtained in order
Character late, into step (1), if the otherwise csv file format error.
According to another aspect of the present invention, a kind of data extraction system of CSV formatted files is additionally provided, including it is as follows
Module：
Spider module, each character for traveling through the CSV formatted files in order；
Extract result and assert module, for when the character is end mark and quotation marks mark is closed, assert the CSV
Formatted file is extracted successfully, if worked as, the character is end of file but quotation marks mark is not turned off, and assert the CSV forms
The format error of file.
It is an advantage of the current invention that the method and system of the present invention are simple efficiently understandable, to greatest extent by a variety of special feelings
The processing of condition is concluded into several steps, and can easily be applied in various software system developments, and can be across programming language
Speech is applied；In addition, the autgmentability of the present invention is also very strong, other literal code form can be expanded to.
Brief description of the drawings
By reading the detailed description of hereafter preferred embodiment, various other advantages and benefit is common for this area
Technical staff will be clear understanding.Accompanying drawing is only used for showing the purpose of preferred embodiment, and is not considered as to the present invention
Limitation.And in whole accompanying drawing, identical part is denoted by the same reference numerals.In the accompanying drawings：
Accompanying drawing 1 shows the data extraction method according to embodiments of the present invention based on the UTF-8 CSV formatted files encoded
FB(flow block)；
Accompanying drawing 2 shows the data extraction method according to embodiments of the present invention based on the UTF-8 CSV formatted files encoded
Algorithm principle block diagram；
Accompanying drawing 3 shows the data extraction system according to embodiments of the present invention based on the UTF-8 CSV formatted files encoded
Structure chart.
Embodiment
The illustrative embodiments of the disclosure are more fully described below with reference to accompanying drawings.Although showing this public affairs in accompanying drawing
The illustrative embodiments opened, it being understood, however, that may be realized in various forms the disclosure without the reality that should be illustrated here
The mode of applying is limited.Conversely it is able to be best understood from the disclosure there is provided these embodiments, and can be by this public affairs
The scope opened completely convey to those skilled in the art.
As shown in figure 1, the invention provides a kind of data extraction method based on the UTF-8 CSV formatted files encoded, bag
Include following steps：S110, each character for traveling through the CSV formatted files in order；S120, only when the character for knot
When beam is accorded with and quotation marks mark is closed, just assert that the CSV formatted files are extracted successfully, if when the character is the end of file
Accord with but quotation marks mark is not turned off, then assert the format error of the CSV formatted files.
When the character is double quotation marks and the quotation marks are to close symbol, the character late of file is obtained in order.When
The character is that double quotation marks and the quotation marks are not when closing symbol, if the previous character of the character is comma, quotation marks or sky,
The character late of file is then obtained in order.When the character is comma or newline and quotation marks mark is closed, first obtain
Cell field value is taken, then obtains the character late of file in order.When the character is comma or newline and quotation marks
When mark is not turned off, the character late of file is directly obtained in order.The cell is the cell where the character.
If the character is not any one in end mark, double quotation marks, comma, newline, directly obtain in order under file
One character.
According to a further advantageous embodiment of the invention, methods described can be decomposed into following steps：
(1), obtain CSV formatted files a character, and judge the character whether end of file；If the character is
End of file then enters step (2), and step (3) is entered if the character is not end of file；
(2), judge that quotation marks identify whether closing, assert that the csv file form is wrong if quotation marks mark is not turned off
By mistake, assert that the csv file is extracted successfully if quotation marks mark is closed；
(3), judge the character whether double quotation marks, if the character is double quotation marks enter step (4), if the character is not
It is that double quotation marks then enters step (5)；
(4) whether be close symbol, the character late of file is if it is obtained in order, into step if, judging the quotation marks
Suddenly (1), if otherwise entering step (8)；
(5), judge the character whether comma, if yes then enter step (6), if otherwise enter step (7)；
(6), judge that quotation marks identify whether closing, if it is first acquiring unit lattice field value, then obtain file in order
Character late, into step (1), if otherwise directly in order obtain file character late, into step (1)；
The cell is the cell where the character.
(7), judge the character whether newline, if yes then enter step (6), if otherwise obtaining file in order
Character late, into step (1)；
(8), judge the character previous character whether comma, quotation marks or sky, file is if it is obtained in order
Character late, into step (1), if the otherwise csv file format error.
Fig. 2 shows the data extraction method according to embodiments of the present invention based on the UTF-8 CSV formatted files encoded
Algorithm principle block diagram.For the special form mentioned in background technology, algorithm very orderliness used in method of the invention
Carried out inducing classification, judgement and extraction to cell field value in the case of above-mentioned are completed with concise step.
First, the algorithm need to specify several initialization conditions, as follows：
Judge the variable whether quotation marks close：BQuotClose=true；
Judge that records the variable whether completed：BIsNewRecord=true；
When traversing quotation marks every time, its previous character is obtained：PrevQuotChar=is empty.
The detailed process of algorithm is described in detail below：
1st, the current character of data line is obtained；
2nd, if double quotation marks, then bQuotClose=！BQuotClose,
If bQuotClose==false (are represented to start a new cell field, or are represented one by escape
Quotation marks), the previous character assignment of quotation marks is obtained to prevQuotChar
If (prevQuotChar==commas or quotation marks or null value), specification format is correct, continues character late, that is, walks
Rapid 1；
Else, the csv forms of mistake, return.
If the 3, comma, and double quotation marks switch mark bQuotClose==true, then a cell is completed, extracting should
Cell data, continue character late, i.e. step 1；
If the 4, comma, but double quotation marks switch mark bQuotClose==false, then illustrate that the cell is contained
Comma, is not extracted, and continues character late, and step 1；
If the 5, CRLF newlines, and bQuotClose==true, then last cell of a record is completed
Extract, bIsNewRecord=true continues cycling through step 1；
If the 6, CRLF, and bQuotClose==false, then the cell for not completing the row also extracts (the i.e. unit
Newline is contained in lattice), bIsNewRecord=false continues cycling through step 1；
If end of file the 7th, has been arrived, and bQuotClose==true, then extract all data and complete.If
BQuotClose==false, then csv format errors.
As shown in figure 3, the data extraction system based on the UTF-8 CSV formatted files encoded according to embodiments of the present invention
100, including following module：
Spider module 110, each character for traveling through the CSV formatted files in order；
Extract result and assert module 120, for when the character is end mark and quotation marks mark is closed, assert described
CSV formatted files are extracted successfully, if worked as, the character is end of file but quotation marks mark is not turned off, and assert the CSV
The format error of formatted file.
When the character is double quotation marks and the quotation marks are to close symbol, the character late of file is obtained in order.When
The character is that double quotation marks and the quotation marks are not when closing symbol, if the previous character of the character is comma, quotation marks or sky,
The character late of file is then obtained in order.When the character is comma or newline and quotation marks mark is closed, first obtain
Cell field value is taken, then obtains the character late of file in order.When the character is comma or newline and quotation marks
When mark is not turned off, the character late of file is directly obtained in order.The cell is the cell where the character.
If the character is not any one in end mark, double quotation marks, comma, newline, directly obtain in order under file
One character.
It should be noted that：
Algorithm and display be not inherently related to any certain computer, virtual bench or miscellaneous equipment provided herein.
Various fexible units can also be used together with based on teaching in this.As described above, construct required by this kind of device
Structure be obvious.In addition, the present invention is not also directed to any certain programmed language.It is understood that, it is possible to use it is various
Programming language realizes the content of invention described herein, and the description done above to language-specific is to disclose this hair
Bright preferred forms.
In the specification that this place is provided, numerous specific details are set forth.It is to be appreciated, however, that the implementation of the present invention
Example can be put into practice in the case of these no details.In some instances, known method, structure is not been shown in detail
And technology, so as not to obscure the understanding of this description.
Similarly, it will be appreciated that in order to simplify the disclosure and help to understand one or more in each inventive aspect, exist
Above in the description of the exemplary embodiment of the present invention, each feature of the invention is grouped together into single implementation sometimes
In example, figure or descriptions thereof.However, the method for the disclosure should be construed to reflect following intention：It is i.e. required to protect
The application claims of shield features more more than the feature being expressly recited in each claim.More precisely, such as following
Claims reflect as, inventive aspect is all features less than single embodiment disclosed above.Therefore,
Thus the claims for following embodiment are expressly incorporated in the embodiment, wherein each claim is in itself
All as the separate embodiments of the present invention.
Those skilled in the art, which are appreciated that, to be carried out adaptively to the module in the equipment in embodiment
Change and they are arranged in one or more equipment different from the embodiment.Can be the module or list in embodiment
Member or component be combined into a module or unit or component, and can be divided into addition multiple submodule or subelement or
Sub-component.In addition at least some in such feature and/or process or unit exclude each other, it can use any
Combination is disclosed to all features disclosed in this specification (including adjoint claim, summary and accompanying drawing) and so to appoint
Where all processes or unit of method or equipment are combined.Unless expressly stated otherwise, this specification (including adjoint power
Profit is required, summary and accompanying drawing) disclosed in each feature can or similar purpose identical, equivalent by offer alternative features come generation
Replace.
Although in addition, it will be appreciated by those of skill in the art that some embodiments described herein include other embodiments
In included some features rather than further feature, but the combination of the feature of be the same as Example does not mean in of the invention
Within the scope of and form different embodiments.For example, in the following claims, times of embodiment claimed
One of meaning mode can be used in any combination.
The present invention all parts embodiment can be realized with hardware, or with one or more processor run
Software module realize, or realized with combinations thereof.It will be understood by those of skill in the art that can use in practice
One in the creating device of microprocessor or digital signal processor (DSP) to realize virtual machine according to embodiments of the present invention
The some or all functions of a little or whole parts.The present invention is also implemented as performing method as described herein
Some or all equipment or program of device (for example, computer program and computer program product).It is such to realize
The program of the present invention can be stored on a computer-readable medium, or can have the form of one or more signal.This
The signal of sample can be downloaded from internet website and obtained, and either provided or carried in any other form on carrier signal
For.
It should be noted that the present invention will be described rather than limits the invention for above-described embodiment, and ability
Field technique personnel can design alternative embodiment without departing from the scope of the appended claims.In the claims,
Any reference symbol between bracket should not be configured to limitations on claims.Word "comprising" is not excluded the presence of not
Element or step listed in the claims.Word "a" or "an" before element does not exclude the presence of multiple such
Element.The present invention can be by means of including the hardware of some different elements and coming real by means of properly programmed computer
It is existing.In if the unit claim of equipment for drying is listed, several in these devices can be by same hardware branch
To embody.The use of word first, second, and third does not indicate that any order.These words can be explained and run after fame
Claim.
The foregoing is only a preferred embodiment of the present invention, but protection scope of the present invention be not limited thereto,
Any one skilled in the art the invention discloses technical scope in, the change or replacement that can be readily occurred in,
It should all be included within the scope of the present invention.Therefore, protection scope of the present invention should be with the protection model of the claim
Enclose and be defined.
Claims (9)
1. a kind of data extraction method of CSV formatted files, comprises the following steps：
Each character of the CSV formatted files is traveled through in order；
Only when the character is end of file and quotation marks mark is closed, just assert that the CSV formatted files are extracted into
Work(, if worked as, the character is end of file but quotation marks mark is not turned off, and assert that the form of the CSV formatted files is wrong
By mistake.
2. the data extraction method of CSV formatted files as claimed in claim 1, it is characterised in that
When the character is double quotation marks and the quotation marks are to close symbol, the character late of file is obtained in order.
3. the data extraction method of CSV formatted files as claimed in claim 1 or 2, it is characterised in that
When the character is double quotation marks and the quotation marks are not to close symbol, if the previous character of the character is comma, drawn
Number or it is empty, then obtain the character late of file in order.
4. the data extraction method of CSV formatted files as claimed in claim 1, it is characterised in that
When the character is comma or newline and quotation marks mark is closed, first acquiring unit lattice field value, then obtain in order
Take the character late of file.
5. the data extraction method of CSV formatted files as claimed in claim 1, it is characterised in that
When the character is comma or newline and quotation marks mark is not turned off, the next of file is directly obtained in order
Individual character.
6. the data extraction method of CSV formatted files as claimed in claim 4, it is characterised in that
The cell is the cell where the character.
7. the data extraction method of CSV formatted files as claimed in claim 1, it is characterised in that
If the character is not any one in end mark, double quotation marks, comma, newline, file is directly obtained in order
Character late.
8. a kind of data extraction method of CSV formatted files, comprises the following steps：
(1), obtain CSV formatted files a character, and judge the character whether end of file；If the character is file
End mark then enters step (2), and step (3) is entered if the character is not end of file；
(2), judge that quotation marks identify whether closing, assert the csv file format error if quotation marks mark is not turned off, such as
Fruit quotation marks mark, which is closed, then assert that the csv file is extracted successfully；
(3), judge the character whether double quotation marks, step (4) is entered if the character is double quotation marks, if the character is not double
Quotation marks then enter step (5)；
(4) whether be close symbol, the character late of file is if it is obtained in order, into step if, judging the quotation marks
(1), if otherwise entering step (8)；
(5), judge the character whether comma, if yes then enter step (6), if otherwise enter step (7)；
(6), judge that quotation marks identify whether closing, if it is first acquiring unit lattice field value, then obtain in order under file
One character, into step (1), if the character late of file is otherwise directly obtained in order, into step (1)；
(7), judge the character whether newline, if yes then enter step (6), if otherwise in order obtain file it is next
Individual character, into step (1)；
(8), judge the character previous character whether comma, quotation marks or sky, if it is in order obtain file it is next
Individual character, into step (1), if the otherwise csv file format error.
9. a kind of data extraction system of CSV formatted files, it is characterised in that including following module：
Spider module, each character for traveling through the CSV formatted files in order；
Extract result and assert module, for when the character is end mark and quotation marks mark is closed, assert the CSV forms
File is extracted successfully, if worked as, the character is end of file but quotation marks mark is not turned off, and assert the CSV formatted files
Format error.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201710154309.XA CN107102973A (en) | 2017-03-15 | 2017-03-15 | The data extraction method and system of a kind of CSV formatted files |
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| CN201710154309.XA CN107102973A (en) | 2017-03-15 | 2017-03-15 | The data extraction method and system of a kind of CSV formatted files |
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Cited By (5)
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| CN107861885A (en) * | 2017-11-07 | 2018-03-30 | 浪潮软件股份有限公司 | A kind of data transmission method and transmitting device |
| CN108763175A (en) * | 2018-06-26 | 2018-11-06 | 中国银行股份有限公司 | A kind of csv file processing method and system |
| CN110147536A (en) * | 2019-05-24 | 2019-08-20 | 深圳市多翼创新科技有限公司 | A kind of data processing method based on File Mapping, device and equipment |
| CN110308937A (en) * | 2019-04-28 | 2019-10-08 | 宁波三星医疗电气股份有限公司 | A method of hyper terminal serial ports in electric power acquisition terminal is opened based on USB flash disk |
| CN110990343A (en) * | 2019-11-25 | 2020-04-10 | 中国银行股份有限公司 | Method and device for transmitting parameters without distortion |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107861885A (en) * | 2017-11-07 | 2018-03-30 | 浪潮软件股份有限公司 | A kind of data transmission method and transmitting device |
| CN108763175A (en) * | 2018-06-26 | 2018-11-06 | 中国银行股份有限公司 | A kind of csv file processing method and system |
| CN110308937A (en) * | 2019-04-28 | 2019-10-08 | 宁波三星医疗电气股份有限公司 | A method of hyper terminal serial ports in electric power acquisition terminal is opened based on USB flash disk |
| CN110308937B (en) * | 2019-04-28 | 2022-06-03 | 宁波三星医疗电气股份有限公司 | Method for opening super terminal serial port in power acquisition terminal based on USB flash disk |
| CN110147536A (en) * | 2019-05-24 | 2019-08-20 | 深圳市多翼创新科技有限公司 | A kind of data processing method based on File Mapping, device and equipment |
| CN110147536B (en) * | 2019-05-24 | 2023-03-24 | 深圳市多翼创新科技有限公司 | Data processing method, device and equipment based on file mapping |
| CN110990343A (en) * | 2019-11-25 | 2020-04-10 | 中国银行股份有限公司 | Method and device for transmitting parameters without distortion |
| CN110990343B (en) * | 2019-11-25 | 2023-08-04 | 中国银行股份有限公司 | Parameter undistorted transmission method and device |
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