CN104320374A - Method of reducing packed data through Oracle transmission - Google Patents
Method of reducing packed data through Oracle transmission Download PDFInfo
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- CN104320374A CN104320374A CN201410381264.6A CN201410381264A CN104320374A CN 104320374 A CN104320374 A CN 104320374A CN 201410381264 A CN201410381264 A CN 201410381264A CN 104320374 A CN104320374 A CN 104320374A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/04—Protocols for data compression, e.g. ROHC
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/22—Parsing or analysis of headers
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- Information Retrieval, Db Structures And Fs Structures Therefor (AREA)
Abstract
The invention relates to the field of network data transmission and aims at providing a method of reducing packed data through Oracle transmission. The method of reducing the packed data through Oracle transmission comprises the following steps of judging whether a transmitted data packet conforms to a protocol head format of a TNS (Transparence Network Substrate) communication protocol by utilizing a database type identification positioner, positioning and extracting compression information by utilizing compression information positioning and a content extractor, positioning and extracting result set information by utilizing a result set information positioner, assembling records of a result set to a two-dimensional table one by one by utilizing an output result set system, and then outputting. According to the method, the data packet transmitted by an Oracle database can be correctly identified, the compression information can be correctly extracted, the packed data can be correctly reduced and the unpacked data can be correctly extracted; the method can also be used as the basis of data storage and reduction.
Description
Technical field
The invention relates to field of network data transmission, particularly a kind of Oracle transmitted data compressing method of reducing.
Background technology
A lot of industry is all at use oracle database at present, when using SQL statement to obtain result set in some cases, there are data identical in a large number, if these identical data transmission primarieses, so can greatly reduce transmitted data on network amount in result set.
In the result set data that general SQL statement returns, can there are identical data in the partial content of part record.Most of relevant database (as SQL Server, DB2, MySQL etc.) by analysis, transmit strictly according to the facts (transmission that the identical data between record can repeat in every bar record) each row of data in result set, this increases the transmission quantity of network undoubtedly.
Summary of the invention
Main purpose of the present invention is to overcome deficiency of the prior art, provides a kind of and correctly can extract compressed information, correct reduction by the data compressed, the correct Oracle transmitted data compressing method of reducing extracting unpacked data.For solving the problems of the technologies described above, solution of the present invention is:
A kind of Oracle transmitted data compressing method of reducing is provided, specifically comprises the steps:
(1) type of database identification locator is utilized, the protocol header style meeting TNS communication protocol is judged whether to the packet of transmission, if meet the protocol header style of TNS communication protocol, the packet then transmitted meets TNS communication protocol, and the packet namely transmitted is the packet of oracle database transmission; If do not meet the protocol header style of TNS communication protocol, then the packet transmitted does not meet TNS communication protocol, is given up by the packet of transmission;
Wherein, described TNS communication protocol is the agreement of oracle database communication, is the application layer data agreement of ICP/IP protocol; TNS communication protocol comprises protocol header, and protocol header is made up of 8 bytes, is followed successively by the length of 2 bytes, the verification of 2 bytes, the Packet type of 1 byte, the reserve bytes of 1 byte, the head verification of 2 bytes;
(2) utilize compressed information to locate and content extractor, whether the record in the packet that determining step (1) identifies is compressed, and realizes the location of compressed information, and extracts the compressed information oriented;
The concrete grammar of compressed information location is: according to TTC agreement, from the packet selected by type of database identification locator, finds the position that TTC protocol header is 0x15, if do not find the TTC protocol header of 0x15, then gives up; If find the TTC protocol header of 0x15, then illustrate that the data content after TTC protocol header is compression relevant information, realize compressed information location;
Compressed information content extractor concrete grammar is: the position found according to compressed information locator, extract the data that TTC protocol header is two bytes after 0x15, the length of compressing mark information below the secondary indication of the content of these two bytes, length value is set to X; The length calculation method of compressing mark information is as follows: X rounds divided by 8, and the value obtained is set to Z, if X is except 8 being that Z+1 byte forms by the length of remainder then compressing mark information, as X does not have the length of remainder then compressing mark information to be that Z byte forms except 8;
The concrete form of described compressing mark information: the most multipotency of 1 byte (8 bit) deposits the compressing mark information of 8 row contents in result set 1 row (if 1 row has the content more than 8 row, then increase the compressing mark information that byte deposits other row), namely 1 bit can be used for representing in result set 1 row, whether 1 row content is compressed; If bit value is 1, then represent that corresponding data is not compressed; If bit value is 0, then represent that corresponding data is compressed;
Wherein, what the packet that oracle database transmits adopted is TNS communication protocol, TNS communication protocol inside comprises TTC agreement, described TTC protocol header is made up of 1 byte, the content (if TTC protocol header is 0x15, content is compressing mark information thereafter) that the value of TTC protocol header contains for the packet represented after TTC protocol header;
Result set is the content that execution SQL statement (mainly select statement) returns, result set is the two-dimentional form be made up of row and column, data line represents a complete record, article one, the TTC protocol header of record is 0x07, and according to TNS communication protocol regulation, there is not compressed information in the Article 1 record of result set; Article one, the reduction of record will be reduced according to compressed information;
(3) according to TTC agreement, utilize result set information locator, in the packet identified by type of database identification locator from step (1), find TTC protocol header to be the position of 0x07, realize the location of result set information; Then the content reductor position of orienting according to result set information locator, extract result set information, concrete extracting method is: locate one by one packet in conjunction with compressed information location and content extractor, if the compressed information of certain row is 1 (compressed information that compressed information locator and content extractor are extracted), then this row content is not compressed, have the information data of these row in after result set information locator is described, then extract this row content; If the compressed information of certain row is 0 (compressed information that compressed information locator and content extractor are extracted), then this row content is compressed, the information data that content after result set information locator does not have this to arrange is described, then using the information that arranges as this of respective column of a upper record;
(4) if the record of result set has not also extracted, the record of judged result collection has extracted according to being: TTC protocol header is that the content part of 0x04 contains no data found printed words; Repeat step (2) and step (3) successively;
(5) utilize Output rusults collecting system, the record of result set is assembled into two-dimentional form one by one, line output of going forward side by side.
Be provided for the Oracle transmitted data compressing restoring system of described a kind of Oracle transmitted data compressing method of reducing, it is characterized in that, comprise type of database identification locator, compressed information location and content extractor, result set information locator, content reductor, Output rusults storage;
Described type of database identification locator for judging whether the packet transmitted is the packet that oracle database transmits, and will not be that the packet that oracle database transmits is given up;
Described compressed information location and content extractor are used in the packet judged by type of database identification locator, orient compressed information and extract compressed information;
Described result set information locator and the packet of content reductor by obtaining from type of database identification locator, orient result set information and extract result set information;
Described Output rusults storage is used for object information location and the information that restores of content reductor to be assembled into bivariate table case form, and the result set that will be assembled into exports.
Compared with prior art, the invention has the beneficial effects as follows:
The present invention correctly can be familiar with the packet of oracle database transmission, correctly extracts compressed information, correctly reduces by the data compressed, correctly extract unpacked data; The foundation that the present invention can also store as data and reduce.
Accompanying drawing explanation
Fig. 1 is Oracle data compression transfer process figure of the present invention.
Embodiment
First it should be noted that, the present invention relates to network data transmission technology, is the one application of computer technology in information data transmission field.In implementation procedure of the present invention, the application of multiple software function module can be related to.Applicant thinks, as reading over application documents, accurate understanding is of the present invention realize principle and goal of the invention after, when in conjunction with existing known technology, those skilled in the art can use its software programming technical ability grasped to realize the present invention completely.Aforementioned software functional module comprises but is not limited to: type of database identification locator, compressed information location and content extractor, result set information locator, content reductor, Output rusults storage etc., this category of all genus that all the present patent application files are mentioned, applicant will not enumerate.
Below in conjunction with accompanying drawing and embodiment, the present invention is described in further detail:
Flow chart as shown in Figure 1, a kind of Oracle transmitted data compressing method of reducing, specifically comprises the steps:
(1) type of database identification locator is utilized, the protocol header style meeting TNS communication protocol is judged whether to the packet of transmission, if meet the protocol header style of TNS communication protocol, the packet then transmitted meets TNS communication protocol, and the packet namely transmitted is the packet of oracle database transmission; If do not meet the protocol header style of TNS communication protocol, then the packet transmitted does not meet TNS communication protocol, is given up by the packet of transmission;
Wherein, described TNS communication protocol is the agreement of oracle database communication, is the application layer data agreement of ICP/IP protocol; TNS communication protocol comprises protocol header, and protocol header is made up of 8 bytes, is followed successively by the length of 2 bytes, the School Affairs of 2 bytes, the Packet type of 1 byte, the reserve bytes of 1 byte, the head School Affairs of 2 bytes;
(2) utilize compressed information to locate and content extractor, whether the record in the packet that determining step (1) identifies is compressed, and realizes the location of compressed information, and extracts the compressed information oriented;
The concrete grammar of compressed information location is: according to TTC agreement, from the packet selected by type of database identification locator, finds the position that TTC protocol header is 0x15, if do not find the TTC protocol header of 0x15, then gives up; If find the TTC protocol header of 0x15, then illustrate that the data content after TTC protocol header is compression relevant information, realize compressed information location;
Compressed information content extractor concrete grammar is: the position found according to compressed information locator, extract the data that TTC protocol header is two bytes after 0x15, the length (representing the value of this content below with X) of compressing mark information below the secondary indication of the content of these two bytes; The length calculation method of compressing mark information is as follows: X rounds (representing this value rounded with Z below) divided by 8, if X is except 8 being that Z+1 byte forms by the length of remainder then compressing mark information, as X does not have the length of remainder then compressing mark information to be that Z byte forms except 8; Below the concrete form of compressing mark information: the most multipotency of 1 byte (8 bit) after compressed information locator deposits the compressing mark information of 8 row contents in result set 1 row (if 1 row has the content more than 8 row, then increase the compressing mark information that byte deposits other row), namely 1 bit can be used for representing in result set 1 row, whether 1 row content is compressed; If bit value is 1, then represent that corresponding data is not compressed; If bit value is 0, then represent that corresponding data is compressed; As table: following there to be 8 row in result set, in table, in the first row, each cell is 1 bit, and the second row is the explanation of respective column
Wherein, what the packet that oracle database transmits adopted is TNS communication protocol, TNS communication protocol inside comprises TTC agreement, described TTC protocol header is made up of 1 byte, the content (if TTC protocol header is 0x15, content is compressing mark information thereafter) that the value of TTC protocol header contains for the packet represented after TTC protocol header;
Result set is the content that execution SQL statement (mainly select statement) returns, result set is the two-dimentional form be made up of row and column, data line represents a complete record, article one, the TTC protocol header of record is 0x07, and according to TNS communication protocol regulation, there is not compressed information in the Article 1 record of result set; Article one, the reduction of record will be reduced according to compressed information;
(3) according to TTC agreement, utilize result set information locator, in the packet identified by type of database identification locator from step (1), find TTC protocol header to be the position of 0x07, realize the location of result set information; Then the content reductor position of orienting according to result set information locator, extract result set information, concrete extracting method is: locate one by one packet in conjunction with compressed information location and content extractor, if the compressed information of certain row is 1 (compressed information that compressed information locator and content extractor are extracted), then this row content is not compressed, have the information data of these row in after result set information locator is described, then extract this row content; If the compressed information of certain row is 0 (compressed information that compressed information locator and content extractor are extracted), then this row content is compressed, the information data that content after result set information locator does not have this to arrange is described, then using the information that arranges as this of respective column of a upper record;
(4) if the record of result set has not also extracted, the record of judged result collection has extracted according to being: TTC protocol header is that the content part of 0x04 contains no data found printed words; Repeat step (2) and step (3) successively;
(5) utilize Output rusults collecting system, the record of result set is assembled into two-dimentional form one by one, line output of going forward side by side.
Be provided for the Oracle transmitted data compressing restoring system of described a kind of Oracle transmitted data compressing method of reducing, comprise type of database identification locator, compressed information location and content extractor, result set information locator and content reductor, Output rusults storage;
Described type of database identification locator for judging whether the packet transmitted is the packet that oracle database transmits, and will not be that the packet that oracle database transmits is given up;
Described compressed information location and content extractor are used in the packet judged by type of database identification locator, orient compressed information and extract compressed information;
Described result set information locator and the packet of content reductor by obtaining from type of database identification locator, orient result set information and extract result set information;
Described Output rusults storage is used for object information location and the information that restores of content reductor to be assembled into bivariate table case form, and the result set that will be assembled into exports.
The following examples can make professional and technical personnel's comprehend the present invention of this specialty, but do not limit the present invention in any way.The present embodiment for guiding, illustrates the method with Output rusults collection.
The information of certain school to student is divided into groups by province, then sorts according to sex, exports name, sex, province name, educational background.
1. Output rusults (fraction information):
| Name | Sex | Province | Educational background |
| Zhang San | Man | Zhejiang | Undergraduate course |
| Li Si | Man | Zhejiang | Undergraduate course |
| King five | Man | Zhejiang | Undergraduate course |
| Li Yuwen | Female | Zhejiang | Undergraduate course |
| Zhou Jianghong | Female | Zhejiang | Undergraduate course |
| Wu Gang | Man | Shanghai | Undergraduate course |
| Liu Yafang | Female | Shanghai | Undergraduate course |
| Hu Shiyi | Female | Shanghai | Undergraduate course |
| Guo Ling | Female | Shanghai | Undergraduate course |
| Luo Liangying | Female | Shanghai | Undergraduate course |
2. compressed information
3. the content of actual data packet
| Name | Sex | Province | Educational background |
| Zhang San | Man | Zhejiang | Undergraduate course |
| Li Si | ? | ? | ? |
| King five | ? | ? | ? |
| Li Yuwen | Female | ? | ? |
| Zhou Jianghong | ? | ? | ? |
| Wu Gang | Man | Shanghai | ? |
| Liu Yafang | Female | ? | ? |
| Hu Shiyi | ? | ? | ? |
| Guo Ling | ? | ? | ? |
| Luo Liangying | ? | ? | ? |
Finally, it should be noted that above what enumerate is only specific embodiments of the invention.Obviously, the invention is not restricted to above embodiment, a lot of distortion can also be had.All distortion that those of ordinary skill in the art can directly derive or associate from content disclosed by the invention, all should think protection scope of the present invention.
Claims (2)
1. an Oracle transmitted data compressing method of reducing, is characterized in that, specifically comprises the steps:
(1) type of database identification locator is utilized, the protocol header style meeting TNS communication protocol is judged whether to the packet of transmission, if meet the protocol header style of TNS communication protocol, the packet then transmitted meets TNS communication protocol, and the packet namely transmitted is the packet of oracle database transmission; If do not meet the protocol header style of TNS communication protocol, then the packet transmitted does not meet TNS communication protocol, is given up by the packet of transmission;
Wherein, described TNS communication protocol is the agreement of oracle database communication, is the application layer data agreement of ICP/IP protocol; TNS communication protocol comprises protocol header, and protocol header is made up of 8 bytes, is followed successively by the length of 2 bytes, the verification of 2 bytes, the Packet type of 1 byte, the reserve bytes of 1 byte, the head verification of 2 bytes;
(2) utilize compressed information to locate and content extractor, whether the record in the packet that determining step (1) identifies is compressed, and realizes the location of compressed information, and extracts the compressed information oriented;
The concrete grammar of compressed information location is: according to TTC agreement, from the packet selected by type of database identification locator, finds the position that TTC protocol header is 0x15, if do not find the TTC protocol header of 0x15, then gives up; If find the TTC protocol header of 0x15, then illustrate that the data content after TTC protocol header is compression relevant information, realize compressed information location;
Compressed information content extractor concrete grammar is: the position found according to compressed information locator, extract the data that TTC protocol header is two bytes after 0x15, the length of compressing mark information below the secondary indication of the content of these two bytes, length value is set to X; The length calculation method of compressing mark information is as follows: X rounds divided by 8, and the value obtained is set to Z, if X is except 8 being that Z+1 byte forms by the length of remainder then compressing mark information, as X does not have the length of remainder then compressing mark information to be that Z byte forms except 8;
The concrete form of described compressing mark information: the most multipotency of 1 byte deposits the compressing mark information of 8 row contents in result set 1 row (if 1 row has the content more than 8 row, then increase the compressing mark information that byte deposits other row), namely 1 bit can be used for representing in result set 1 row, whether 1 row content is compressed; If bit value is 1, then represent that corresponding data is not compressed; If bit value is 0, then represent that corresponding data is compressed;
Wherein, what the packet of oracle database transmission adopted is TNS communication protocol, and TNS communication protocol inside comprises TTC agreement, and described TTC protocol header is made up of 1 byte, the content that the value of TTC protocol header contains for the packet represented after TTC protocol header;
Result set is the content that execution SQL statement returns, result set is the two-dimentional form be made up of row and column, and data line represents a complete record, and the TTC protocol header of a record is 0x07, and according to TNS communication protocol regulation, there is not compressed information in the Article 1 record of result set; Article one, the reduction of record will be reduced according to compressed information;
(3) according to TTC agreement, utilize result set information locator, in the packet identified by type of database identification locator from step (1), find TTC protocol header to be the position of 0x07, realize the location of result set information; Then the content reductor position of orienting according to result set information locator, extract result set information, concrete extracting method is: locate one by one packet in conjunction with compressed information location and content extractor, if the compressed information of certain row is 1, then this row content is not compressed, have the information data of these row in after result set information locator is described, then extract this row content; If compressed information of certain row is 0, then this row content is compressed, and the information data that the content after result set information locator does not have this to arrange is described, then the information that arranges as this of respective column recorded upper one;
(4) if the record of result set has not also extracted, the record of judged result collection has extracted according to being: TTC protocol header is that the content part of 0x04 contains no data found printed words; Repeat step (2) and step (3) successively;
(5) utilize Output rusults collecting system, the record of result set is assembled into two-dimentional form one by one, line output of going forward side by side.
2. for the Oracle transmitted data compressing restoring system of a kind of Oracle transmitted data compressing method of reducing according to claim 1, it is characterized in that, comprise type of database identification locator, compressed information location and content extractor, result set information locator, content reductor, Output rusults storage;
Described type of database identification locator for judging whether the packet transmitted is the packet that oracle database transmits, and will not be that the packet that oracle database transmits is given up;
Described compressed information location and content extractor are used in the packet judged by type of database identification locator, orient compressed information and extract compressed information;
Described result set information locator and the packet of content reductor by obtaining from type of database identification locator, orient result set information and extract result set information;
Described Output rusults storage is used for object information location and the information that restores of content reductor to be assembled into bivariate table case form, and the result set that will be assembled into exports.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108415927A (en) * | 2018-01-17 | 2018-08-17 | 中国科学院声学研究所 | A kind of restoring method and device of non-sequential table |
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| CN101836403A (en) * | 2007-10-25 | 2010-09-15 | 微软公司 | Compressing null columns in rows of the tabular data stream protocol |
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Address after: Zhejiang Zhongcai Building No. 68 Binjiang District road Hangzhou City, Zhejiang Province, the 310051 and 15 layer Patentee after: Hangzhou Annan information technology Limited by Share Ltd Address before: Hangzhou City, Zhejiang province 310051 Binjiang District and Zhejiang road in the 15 storey building Patentee before: Dbappsecurity Co.,ltd. |