CN107992561A - A kind of method of long field in parsing EDB database source files - Google Patents
A kind of method of long field in parsing EDB database source files Download PDFInfo
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- CN107992561A CN107992561A CN201711227426.0A CN201711227426A CN107992561A CN 107992561 A CN107992561 A CN 107992561A CN 201711227426 A CN201711227426 A CN 201711227426A CN 107992561 A CN107992561 A CN 107992561A
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
- G06F16/20—Information retrieval; Database structures therefor; File system structures therefor of structured data, e.g. relational data
- G06F16/22—Indexing; Data structures therefor; Storage structures
- G06F16/2282—Tablespace storage structures; Management thereof
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
- G06F16/20—Information retrieval; Database structures therefor; File system structures therefor of structured data, e.g. relational data
- G06F16/24—Querying
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Abstract
The invention discloses a kind of method of long field in parsing EDB database source files, it is characterised in that comprises the following steps:S100:The summary table for building the EDB databases collects table；S200:Search the summary table and collect data of the Type equal to 4 in table, and obtain storage page number of the value of corresponding ColtypOrPgnoFDP as the long field；S300:According to the storage page number, the initial address of page where the addressing long field；S400:Judge whether current page stores the long field enough, if so, performing step S600, otherwise perform step S500；S500:The page number for storing the long field enough is searched, performs step S600；S600:Address and parse the long field.The present invention solves the technical problem that there is no the method for long field in parsing EDB database source files in the prior art.
Description
Technical field
The invention belongs to data recovery field, is related to a kind of method for parsing data in database source file, more particularly to
A kind of method of long field in parsing EDB database source files.
Background technology
EDB databases are a kind of Embedded database engines based on SQL Server CE, for based on Windows CE's
Application program provides Core Feature, and exchange mailboxes storage for Microsoft and IE10 browsers browse depositing for record
Storage.By using EDB, developer can create an object storage, be known as database volume (volume), wherein can include more
A database.Database volume is based on file, therefore can easily be duplicated and move.
When EDB database sources file corruption or due to other reasons can not be opened when, it is necessary to which a kind of method is searched and obtained
The data in EDB database source files are taken, to achieve the purpose that to recover data.In the prior art, Application No.
201710928197.9, the applying date be on October 09th, 2017, entitled《Long field in one kind parsing EDB database source files
Method》Patent application, and Application No. 201711050230.9, the applying date are on October 31st, 2017, entitled《It is a kind of
The method for parsing data in EDB database source files》Patent application in, although disclose lookup and parsing EDB database sources
The method of data in file, but the method for how parsing long field data in EDB database source files is not directed to, therefore,
A kind of method of long field in parsing EDB database source files is needed, must not be parsed with solution and recover long field data
Technical problem.
The content of the invention
The present invention is in view of the deficiencies of the prior art and the above problem, it is proposed that mistake in one kind parsing EDB database source files
The method of long field, collects data of the Type equal to 4 in table by searching for summary table and obtains corresponding ColtypOrPgnoFDP's
It is worth the storage page number as long field, page where addressing the storage page number simultaneously parses long field, obtains the number of long field
According to body, comprise the following steps:
S100:The summary table for building the EDB databases collects table；
S200:Search the summary table and collect data of the Type equal to 4 in table, and obtain corresponding ColtypOrPgnoFDP
Storage page number of the value as the long field；
S300:According to the storage page number, the initial address of page where the addressing long field；
S400:Judge whether current page stores the long field enough, if so, performing step S600, otherwise perform
Step S500；
S500:The page number for storing the long field enough is searched, performs step S600；
S600:Address and parse the long field.
Preferably, build the summary table and collect table, its structure is shown in Table 1:
Table 1:Summary table collects table
Wherein, described value 1, value 2, value 3 ..., value n be that the summary table collects the value of each title in table, n be not less than
1 positive integer.
Preferably, the step S300 comprises the following steps:
S301:The storage page number adds 1 sum, multiplied by with the page length degree of every page, draws page where the storage page number
Relative to the deflected length of the first address of the EDB databases；
S302:Using the first address of the EDB databases as initial address, the deflected length is redirected backward, described in addressing
The initial address of page where long field.
Preferably, the step S400 comprises the following steps:
S401:Using the first address of current page as initial address, 0x24 bytes are redirected backward and read the content of current byte；
S402:Judge whether the content of current byte is equal to 0x83, if so, performing step S600, otherwise perform step
S500。
Preferably, the step S500 comprises the following steps:
S501:It is 0x85 to read current byte content；
S502:Using the first address of current page as initial address, 0x40 bytes are redirected backward, and continuously read 0x10 byte
Content be the page number, the page number is stored with small end form；
S503:The page number adds 1 sum, and multiplied by with the page length degree of every page, page is relative to institute where drawing the page number
The deflected length of the first address of EDB databases is stated, the first address of page where being addressed to the page number；
S504:Using the first address of page where the page number as initial address, 0x24 bytes are redirected backward, read current byte
Content be 0x82.
Preferably, the step S600 comprises the following steps:
S601:Search and parse the data management field of current page:0x08 is subtracted from the page footing address of the current page to obtain
The address arrived is initial address, and using two nybbles as one group, order reads forward the first data management word of the current page
Section and the second data management field, wherein, low 2 byte content in the nybble is grown for the data message of small end form storage
Degree, high 2 byte content are the data message offset of small end form storage；
S602:First data management field is parsed, addresses and parses mark and the institute of the sequence number of the long field
State the sequence number of long field:Using the first address of the current page as initial address, 0x50 is redirected backward and adds first data
The data message offset of management fields, using current address as initial address, the content that order reads 2 bytes is the sequence number
Mark；The content for sequentially reading continuous 4 byte after the mark of the sequence number is the sequence number of the long field, described to cross long word
The sequence number of section is stored with big end form；The byte length summation of the mark of the sequence number and the sequence number is no more than the described first number
According to the data message length of management fields；
S603:Second data management field is parsed, addresses and parses the data message of the long field:With described
The first address of current page is initial address, and the data message for redirecting 0x50 backward plus second data management field deviates
Amount, the content for reading current address is the data message, and the byte length of the data message is second data management
The data message length of field；Wherein, the content of the data message the 1st and the 2nd byte is the mark of the long field, the
The sequence number for the long field that the content of 3 to the 6th bytes stores for big end form；The content of 7th to the 10th byte is invalid
Byte；The content that 11st byte starts is the data volume of the long field, the length of second data management field
Data message length subtracts the byte length of the indicating of the long field, the sequence number of the long field and the slack byte
Summation.
Preferably, the data volume of the long field is stored with ASCII Hex or ANSI ASCII fromat.
The beneficial effects of the invention are as follows:Solve and there is no long field in parsing EDB database source files in the prior art
Method technical problem.
Brief description of the drawings
Fig. 1 is the main flow chart of the present invention；
Fig. 2 is the data structure schematic diagram of page in the embodiment of the present invention；
Fig. 3 is the data structure schematic diagram of data management field in the present invention；
Fig. 4 is the data structure signal of the sequence number of the mark of the sequence number of long field and long field in the embodiment of the present invention
Figure.
Embodiment
Application No. 201710928197.9, the applying date are on October 09th, 2017, entitled by the present invention《One kind is searched
The method of data in EDB database source files》Patent application, and Application No. 201711050230.9, the applying date be
It is on October 31st, 2017, entitled《A kind of method of data in parsing EDB database source files》Patent application full content
It is incorporated by reference in the present invention.
The present invention is further elaborated with reference to the accompanying drawings and examples.As shown in Figure 1, the method for the present invention includes with
Lower step:
S100:The summary table of structure EDB databases collects table:It is with reference to Application No. 201711050230.9, the applying date
It is on October 31st, 2017, entitled《A kind of method of data in parsing EDB database source files》Patent application full content,
The summary table for repeating no more structure EDB databases collects the specific steps of table, and the summary table for building the present embodiment collects the structure of table and sees
Table 2:
Table 2:The summary table of embodiment collects table
It is worth noting that, for simplicity, all titles are not shown in table 2.
S200:Long field is represented since Type is equal to 4, Type is equal to 4 data, and acquisition pair in look-up table 2
Storage page number of the value 229 of the ColtypOrPgnoFDP answered as long field；It is worth noting that, the numerical value in table 2 is
Decimal number.
S300:According to storage page number, the initial address of page, comprises the following steps where addressing long field:
S301:Store page number 229 plus 1 and equal to 230, it is 0xE6 to be translated into hexadecimal number, multiplied by with each
The page length degree 0x8000 of page, draws deflected length 0x730000 of the storage page number place page relative to the first address of EDB databases；
S302:Using the first address 0x00000000 of EDB databases as initial address, deflected length is redirected backward
0x730000, the initial address of page is 0x730000 where addressing long field, as shown in Figure 2.
S400:Judge whether current page stores the long field enough, if so, performing step S600, otherwise perform
Step S500；Including following steps as shown in Figure 3:
S401:Using the first address 0x730000 of current page as initial address, 0x24 bytes are redirected backward and read current word
The content of section；
S402:Judge whether the content of current byte is equal to 0x83, if so, performing step S600, otherwise perform step
S500；In one embodiment of the present of invention, the content of current byte is equal to 0x83, the content as shown in oval frame in Fig. 2, because
This, flow performs step S600.
S500:The page number for storing the long field enough is searched, performs step S600.Step S500 includes following step
Suddenly:
S501:It is 0x85 to read current byte content；
S502:Using the first address of current page as initial address, 0x40 bytes are redirected backward, and continuously read 0x10 byte
Content be page number, which is stored with small end form；
S503:The page number adds 1 sum, multiplied by page where with the page length degree 0x8000 of every page, drawing the page number relative to
The deflected length of the first address of EDB databases, the first address of page where being addressed to the page number；
S504:Using the first address of page where the page number as initial address, 0x24 bytes are redirected backward, read current byte
Content is 0x82.
S600:Address and parse the long field, comprise the following steps:
S601:Search and parse the data management field of current page:As shown in figure 3, from the page footing address of current page
0x737FFF subtracts 0x08, and it is initial address to obtain address 0x737FF7, and using two nybbles as one group, order reads forward institute
The first data management field and the second data management field of current page are stated, as shown in figure 3, the content shown in rectangle frame is first
Data management field 0x0E002C04, the content shown in underscore are the second data management field 0x0E041E00；
Wherein, low 2 byte content in nybble is the data message length of small end form storage, as shown in figure 3, first
The data message length of data management field and the second data management field is respectively 0x0E00 and 0x0E04, due to being small end lattice
Formula stores, therefore, data message length each should be 0x000E and 0x040E；
Wherein, the data message offset that high 2 byte content stores for small end form, the first data management field and second
The data message offset of data management field is respectively 0x2C04 and 0x1E00, and due to being the storage of small end form, therefore data are believed
Breath offset each should be 0x042C and 0x001E；
S602:The first data management field is parsed, the mark and long field of addressing and the sequence number of parsed long field
Sequence number:Using the first address 0x730000 of current page as initial address, the number that 0x50 adds the first data management field is redirected backward
It is believed that breath offset 0x042C, is addressed to 0x73047C, as shown in figure 4, using current address 0x73047C as initial address, order
Read 2 bytes content be sequence number mark 0x0420, the content as shown in rectangle frame in Fig. 4；Order reads the mark of sequence number
The content of continuous 4 byte afterwards is the sequence number 0x000002 of long field, and the sequence number of long field is stored with big end form, therefore,
Serial number 0x000002, the content as shown in underscore in Fig. 4；The mark of sequence number and the byte length summation of sequence number are not more than
0x000E byte of data message length of first data management field；
S603:The second data management field is parsed, addresses and parses the data message of long field:With the first ground of current page
Location 0x730000 is initial address, redirects the data message offset 0x001E that 0x50 adds the second data management field backward,
Address 0x73006E is addressed to, as shown in Fig. 2, the content for reading current address 0x73006E is data message, data message
Byte length is the data message length 0x040E of the second data management field, i.e. 0x73006E adds 0x040E, obtains data
The end address of information is 0x73047C；Wherein, the content as shown in rectangle frame in Fig. 2, the 1st and the 2nd byte of data message
Content be long field mark 0x0820；Content as shown in underscore in Fig. 2, the content of the 3rd to the 6th byte is big end
The sequence number 0x000002 of the long field of form storage, sequence number is identical with the sequence number of step S602, represents the sequence number in same table
For the same long field of 0x000002；Content as shown in round rectangle frame in Fig. 2, the content of the 7th to the 10th byte is nothing
Imitate byte 0x00000000；Content as shown in big rectangle frame in Fig. 2, the content that the 11st byte starts are the data of long field
Body, the data message length 0x040E of the length of second data management field subtract the indicating of long field, long field
The byte length summation of sequence number and slack byte amounts to 0x0A bytes, i.e. the length of data volume is 0x404.
As shown in the content of right rectangular frame in Fig. 2, the content of long field data body is ANSI in the present embodiment
The network address of ASCII character form storage, it is notable that with for purpose of brevity, the total data of the long field is not shown in Fig. 2
Body.
By method provided by the invention, the method that long field in EDB database source files can be parsed.
It should be appreciated that the invention is not restricted to above-mentioned citing, for those of ordinary skills, can basis
Described above is improved or converted, and all these modifications and variations should all belong to the protection model of appended claims of the present invention
Enclose.
Claims (7)
1. a kind of method of long field in parsing EDB database source files, it is characterised in that comprise the following steps:
S100:The summary table for building the EDB databases collects table；
S200:Search the summary table and collect data of the Type equal to 4 in table, and obtain the value of corresponding ColtypOrPgnoFDP
Storage page number as the long field；
S300:According to the storage page number, the initial address of page where the addressing long field；
S400:Judge whether current page stores the long field enough, if so, performing step S600, otherwise perform step
S500；
S500:The page number for storing the long field enough is searched, performs step S600；
S600:Address and parse the long field.
2. the method for long field in a kind of parsing EDB database source files according to claim 1, it is characterised in that
Build the summary table and collect table, its structure is shown in Table 1:
Table 1:Summary table collects table
Wherein, described value 1, value 2, value 3 ..., value n be that the summary table collects the value of each title in table, n is not less than 1
Positive integer.
3. the method for long field in a kind of parsing EDB database source files according to claim 2, it is characterised in that
The step S300 comprises the following steps:
S301:The storage page number adds 1 sum, and multiplied by with the page length degree of every page, page where drawing the storage page number is opposite
In the deflected length of the first address of the EDB databases；
S302:Using the first address of the EDB databases as initial address, the deflected length is redirected backward, and addressing is described long
The initial address of page where field.
4. the method for long field in a kind of parsing EDB database source files according to claim 3, it is characterised in that
The step S400 comprises the following steps:
S401:Using the first address of current page as initial address, 0x24 bytes are redirected backward and read the content of current byte；
S402:Judge whether the content of current byte is equal to 0x83, if so, performing step S600, otherwise perform step S500.
5. the method for long field in a kind of parsing EDB database source files according to claim 4, it is characterised in that
The step S500 comprises the following steps:
S501:It is 0x85 to read current byte content；
S502:Using the first address of current page as initial address, 0x40 bytes are redirected backward, and continuously read the interior of 0x10 byte
Hold and stored for the page number, the page number with small end form；
S503:The page number adds 1 sum, and multiplied by with the page length degree of every page, page is relative to the EDB where drawing the page number
The deflected length of the first address of database, the first address of page where being addressed to the page number；
S504:Using the first address of page where the page number as initial address, 0x24 bytes are redirected backward, read the interior of current byte
Hold for 0x82.
6. the method for long field in a kind of parsing EDB database source files according to claim 5, it is characterised in that
The step S600 comprises the following steps:
S601:Search and parse the data management field of current page:Subtract what 0x08 was obtained from the page footing address of the current page
Address is initial address, using two nybbles as one group, order read forward the current page the first data management field and
Second data management field, wherein, low 2 byte content in the nybble is the data message length of small end form storage,
High 2 byte content is the data message offset of small end form storage；
S602:First data management field is parsed, addresses and parses the mark of the sequence number of the long field and the mistake
The sequence number of long field:Using the first address of the current page as initial address, 0x50 is redirected backward and adds first data management
The data message offset of field, using current address as initial address, the content that order reads 2 bytes is the mark of the sequence number
Will；The content that order reads continuous 4 byte after the mark of the sequence number is the sequence number of the long field, the long field
Sequence number with big end form store；The byte length summation of the mark of the sequence number and the sequence number is not more than first data
The data message length of management fields；
S603:Second data management field is parsed, addresses and parses the data message of the long field:With described current
The first address of page is initial address, redirects the data message offset that 0x50 adds second data management field backward, is read
The content for taking current address is the data message, and the byte length of the data message is second data management field
Data message length；Wherein, the content of the data message the 1st and the 2nd byte be the long field mark, the 3rd to the 6th
The sequence number for the long field that the content of byte stores for big end form；The content of 7th to the 10th byte is slack byte；The
The content that 11 bytes start be the long field data volume, the data message of the length of second data management field
Length subtracts the byte length summation of the indicating of the long field, the sequence number of the long field and the slack byte.
7. the method for long field in a kind of parsing EDB database source files according to claim 6, it is characterised in that
The data volume of the long field is stored with ASCII Hex or ANSI ASCII fromat.
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Application publication date: 20180504 |