CN109918375A - It is a kind of based on block chain and the big text of distributed storage storage, index and search method - Google Patents
It is a kind of based on block chain and the big text of distributed storage storage, index and search method Download PDFInfo
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Abstract
The invention discloses a kind of based on block chain and the storage of the big text of distributed storage, index and search method, it is first by big text data store into distributed storage network, distributed storage network is that the big text data distributes unique identification doc_id, and it is addressed by data of the doc_id to the big text, then to big line of text participle and retrieval process.The present invention combines block chain intelligence contract technology with distributed storage network technology, it can be realized and carry out big text data store at low cost on block chain, and carry out content retrieval to fast accurate, make that the DAPP of big text data is needed technically to become possibility, threshold is reduced in cost.
Description
Technical field
The invention belongs to intelligent contracts and block chain technical field of data storage, and in particular to one kind is based on block chain and divides
The storage of big text, index and the search method of cloth storage.
Background technique
It is, in general, that block chain network is made of data Layer, network layer, common recognition layer, excitation layer, contract layer and application layer.
Wherein, data Layer encapsulates bottom data block and the technologies such as relevant data encryption and timestamp；Network layer then includes point
Cloth networking mechanism, data dissemination mechanism and data authentication mechanism etc.；All kinds of common recognitions of common recognition layer predominant package network node are calculated
Method；Economic factor is integrated into block chain technical system by excitation layer, main issuing mechanism and distribution including economic incentives
Mechanism etc.；All kinds of scripts of contract layer predominant package, algorithm and intelligent contract, are the bases of block chain programmable features；Application layer
Then encapsulate the various application scenarios and case of block chain.Chain type block structure, the common recognition of distributed node based on timestamp
The intelligent contract of mechanism, the economic incentives based on common recognition calculation power and flexible programmable is the most representative innovation of block chain technology
Point.On this basis, transaction data can be stored in the block that can not be distorted, and block is contacted shape sequentially in time
It at block chain, is signed by asymmetric encryption and guarantees the safety of transaction, by the common recognition algorithm such as common POW or POS, made entire
Network is reached an agreement, and realizes that the transmission of message is synchronous with data by P2P technology.The advantage of the technology be have it is anti-tamper,
The characteristics such as transparent and decentralization can lack in the network trusted at one and realize Secure Transaction and digital safeguarding of assets.
It after the publication of bit coin, is compared with legal tender, none publisher concentrated, but by network node
It calculates and generates, who is likely to participate in manufacture bit coin, and can be circulated with the whole world, and the block chain technology of behind is with regard to rapid
The approval of people has been obtained, and has obtained quick development, has been developed later by second generation block chain technology ether mill.Ether
Mill is that block chain introduces the complete programming framework " intelligent contract " of figure spirit, and ether mill is a platform and a kind of programming language,
Developer is set to establish and issue next-generation Distributed Application, ether mill can be used to program, disperse, assure and trade to appoint
What object such as ballot, domain name, financial transaction institute, crowd raise, company management, contract and most agreement, intellectual property, there are also
Beneficial to the intellectual capital of hardware integration, so that people is based on it and run Distributed Application DAPP on block chain, make block chain
Industry landing be possibly realized, further excite the prosperity of block chain technology.
Traditional network store system stores all data using the storage server concentrated, and storage server becomes system
The bottleneck and reliability of performance and the focus of safety are not able to satisfy the needs of Mass storage application.Distributed network is deposited
Storage system uses expansible system structure, shares storage load using more storage servers, is positioned using location server
Information is stored, it not only increases the reliability, availability and access efficiency of system, is also easy to extend.Also, distributed storage
Network is a kind of distributed file system based on p 2 p technology, can be distributed to the node of p2p network for after file fragmentation
Upper carry out distributed storage, relative to traditional centralization storage system, with high security, access speed is fast, at low cost etc.
Advantage.
When developing DAPP on block chain, needed for business, it would be desirable to various shapes are stored in intelligent contract
The data of formula, but its carrying cost be it is very high, need a large amount of service charge, be only suitable for storing a small amount of numbers of some keys
According to being not suitable for very much the storage of large-scale data, this is undoubtedly unfavorable for the large-scale application of block chain.Such as news matchmaker
For the application of a large amount of big texts of the needs such as body, electronic contract storage, expensive carrying cost will make it be difficult to cochain.
In addition, the storage operation of big text (or big binary system) data has certain for text data big on chain
Particularity, be mainly reflected in following three aspects: first is that big text object cannot be operated with general character string function,
Function operation can only be edited with the BLOB that PowerBuilder is provided；Second is that being needed since the text object to be manipulated is excessive
Establishment output input function (or process) is pre-processed；Third is that storage BLOB record has specific requirement to transaction object,
The retrieval of data is also a problem, is difficult to be intended to get accurate data according to user, and the acquisition of data is in applying
One most basic demand.
Summary of the invention
In view of above-mentioned, the present invention provides a kind of based on block chain and the storage of the big text of distributed storage, index and inspection
Block chain intelligence contract technology is combined with distributed storage network technology, be can be realized on block chain by Suo Fangfa
Carry out big text data store at low cost, and fast accurate carry out content retrieval, make the DAPP for needing big text data
Technically become possibility, threshold is reduced in cost.
It is a kind of based on block chain and the big text of distributed storage storage, index and search method, include the following steps:
(1) by big text data store into distributed storage network, distributed storage network is the distribution of big text data
Unique identification doc_id, and be addressed by data of the doc_id to big text；
(2) word segmentation processing is carried out to big text data, generates lists of keywords, and construct keyword based on all keywords
Inverted index table keywords_index_table makes each keyword Hash keyword_hash be directed toward big text data only
One mark doc_id；
(3) by concordance list keywords_index_table storage into distributed storage network, and by its unique identification
Keywords_index_table_id and title keywords_index_table_name storage is specific into block chain network
In the data structure of intelligent contract；
(4) a kind of special type bigtext is established in intelligent contract, will be reflected by the variable that the type is stated
It penetrates as the respective index table keywords_index_table in distributed storage network, name variable and manipulative indexing table
Keywords_index_table binding, and distributed storage is stored into together with name variable big text data relevant with variable
It in network, and obtains a unique identification and is addressed, while big text data can also be fabricated and index concordance list
In keywords_index_table.
Further, the name variable of the type bigtext is expired according to concordance list keywords_index_table
The function of foot is formulated, and consistent with keywords_index_table_name.For example, articals can indicate one
The concordance list of " article " big text data is stored, contracts can indicate the index of the big textual data of a storage " contract "
Table ... etc..
Further, the intelligent contract is open write-in interface and Retrieval Interface, and write-in interface is for receiving such as variable
The parameter of title and big text data by the big text data deposit distributed memory system of correspondence and constructs concordance list for it
keywords_index_table；Retrieval Interface is used to receive the parameter of parameter such as name variable and keyword, and returns and meet
The lists of documents of condition.
Further, the step (2) is realized by following two program:
Program is segmented, for carrying out word segmentation processing to big text data, generates lists of keywords, and lists of keywords is passed
Pass concordance list construction procedures；
Concordance list construction procedures for carrying out Hash operation to lists of keywords, and are based on keyword Hash keyword_
Hash constructs keyword inverted index table keywords_index_table, is directed toward each keyword Hash keyword_hash
The unique identification doc_id of big text data.Keyword may be from different big text data word segmentation results, so indexing
In table keywords_index_table, keyword Hash keyword_hash may be directed toward multiple doc_id, i.e., one about
The list of doc_id.
Further, it when the concordance list construction procedures update concordance list keywords_index_table every time, all needs
Corresponding concordance list keywords_index_table is read from distributed storage network, write again again after having updated
Return distributed storage network.
Further, the concrete function of the intelligent contract write-in interface realizes that process is as follows:
1.1, according to the parameter about name variable, find the name variable institute by the program of contract virtual machine automatically
Associated concordance list unique identification keywords_index_table_id, and by the unique identification, from distributed file system
It is middle to read corresponding concordance list data；
1.2 it is automatic call participle programs to segment big text data, generate lists of keywords, and by lists of keywords
Pass to concordance list construction procedures；
1.3 automatic calling concordance list construction procedures carry out Hash operation to the lists of keywords of big text data, and are based on
Keyword Hash keyword_hash constructs keyword inverted index table keywords_index_table, makes keyword Hash
Keyword_hash is directed toward the unique identification doc_id of big text data.
Further, the concrete function of the intelligent contract Retrieval Interface realizes that process is as follows:
2.1, according to the parameter about name variable, find the name variable institute by the program of contract virtual machine automatically
Associated concordance list unique identification keywords_index_table_id, and by the unique identification, from distributed file system
It is middle to read corresponding concordance list data；
2.2, according to the parameter about keyword, calculate keyword Hash keyword_hash, and pass through keyword Hash
Keyword_hash searches for concordance list keywords_index_table, obtains corresponding doc_id list；Then, according to doc_
Corresponding big text data is read in id list from distributed storage network, and returns to user, and then to every in returning the result
A big text data calculate for the matching degree of keyword, and resulting matching degree score is used for the row of returning the result
Sequence.
Further, the distributed storage network includes but is not limited to following several: IPFS, Sia, Storj, Swarm.
Further, when the name variable of type bigtext and manipulative indexing table keywords_ in the step (4)
After index_table binding, its name variable and concordance list unique identification keywords_ are safeguarded in block chain intelligence contract
The corresponding relationship of index_table_id, i.e. keywords_index_table_name-> keywords_index_table_
id。
Further, the corresponding relationship is safeguarded by the contract virtual machine in block catenary system, and automatically will be right
It should be related in the database for being stored in block chain, intelligent contract only needs the variable for simply stating type bigtext, parameter name
Claim to be index table name keywords_index_table_name itself, to simplify contract exploitation.
For the present invention by big text data store into distributed storage network, distributed storage network is the big text data
Unique identification is distributed, and is addressed by data of the unique identification to the big text, big text data is segmented,
Keyword inverted index table is generated based on word segmentation result, the big text where making keyword Hash be directed toward keyword stores unique
Mark is based on keyword inverted index table, according to corresponding key search to corresponding big text list.Furthermore the present invention permits
Perhaps developer states the variable of specific type bigtext a kind of, and makes one in the variable mappings distributed storage network
Keyword inverted index table makes big text data store relevant to the variable into distributed network, and constructs and index rope
Draw in table.Meanwhile the present invention also allows to retrieve concordance list corresponding to the variable by keyword, and obtains corresponding
Big text data.
It can be seen that the present invention combines block chain intelligence contract technology with distributed storage network technology, realize
Carry out big text data store at low cost on block chain, and fast accurate carry out content retrieval, make to need big text
The DAPP of data technically becomes possibility, and threshold is reduced in cost.
Detailed description of the invention
Fig. 1 is big Stored Procedure schematic diagram of the text in distributed storage network of the present invention.
Fig. 2 is the process schematic that the big text of the present invention is segmented and indexed in distributed storage network.
Fig. 3 is the block schematic illustration of block chain contract virtual machine architecture of the present invention.
Specific embodiment
In order to more specifically describe the present invention, with reference to the accompanying drawing and specific embodiment is to technical solution of the present invention
It is described in detail.
It is including as follows the present invention is based on block chain and the storage of the big text of distributed storage network, index and search method
Step:
(1) Fig. 1 illustrates process of the big text data store to distributed storage network, step 1: by big text data
Text1 carries out fragment simultaneously, and wherein fragment is respectively text1-slice1, text1-slice2, text1-slice3, text1-
Slice4, specific fragment quantity and data total size are related with the size of each fragment；Step 2: by fragment storage to distribution
Formula stores in network；Step 3: unique identification text1-doc_id is distributed for stored big data, distributed storage network will
It can be addressed by data text1 of the text1-doc_id to big text；Specific unique identification generating mode is with no restrictions.
(2) Fig. 2 illustrates the process that big text is segmented and indexed in distributed storage network, step 1: to big text into
Row word segmentation processing generates lists of keywords；Step 2: keyword inverted index table keywords_ is constructed based on all keywords
Index_table (hereinafter referred to as concordance list) makes the cryptographic Hash keyword_hash of each keyword be directed toward the unique of big text
Identify doc_id；Step 3: concordance list is stored in distributed network；Step 4: distributed storage network is concordance list distribution
Unique identification keyword_index_table_id.
(3) after concordance list being stored in distributed storage network, and by its unique identification keywords_index_
Table_id and title keywords_index_table_name is stored in the data knot of concrete intelligence contract in block chain network
In structure.
(4) a kind of special type bigtext is established in intelligent contract, will be mapped by the variable that the type is stated
For the respective index table keywords_index_table in distributed storage network, variable name and manipulative indexing table are bound,
Big text data relevant to variable, can all be stored into distributed storage network, and obtains a unique identification and be addressed；
Meanwhile big text data can also be fabricated and index in concordance list.
The function that name variable can be met according to concordance list is formulated；For example, articals can indicate that one is deposited
The concordance list of the big text of article is stored up, contracts can indicate the concordance list, etc. of a big text of storage contract, variable
Title is consistent with above-mentioned keywords_index_table_name.
The open write-in interface of intelligent contract and Retrieval Interface, wherein write-in interface receives about name variable and big textual data
According to parameter, the big text of correspondence is stored in distributed memory system, and be that it constructs concordance list；Retrieval Interface receives about variable
The parameter of title and keyword, and return to qualified lists of documents.
A participle program and a concordance list construction procedures are also needed in present embodiment, participle program can be to big text
This is segmented, and generates lists of keywords, and lists of keywords is passed to concordance list construction procedures.
Concordance list construction procedures can carry out Hash operation to the lists of keywords of big text, and be based on keyword Hash structure
Keyword inverted index table is built, keyword Hash is made to be directed toward the unique identification doc_id of big text；Keyword may be from difference
Big text word segmentation result, so the cryptographic Hash of keyword is possible to be directed toward multiple doc_id in concordance list, i.e. a doc_
Id list.
When concordance list construction procedures update concordance list every time, require to read corresponding index from distributed storage network
Table writes back distributed storage network again again after having updated.
Fig. 3 illustrates the contract virtual machine architecture of block chain, and the write-in interface of contract can realize following functions:
(1) it according to parametric variable title, is found associated by the name variable automatically by the program of contract virtual machine
Concordance list unique identification keywords_index_table_id, and by the unique identification, it is read from distributed file system
Corresponding concordance list data.
(2) automatic that participle program is called to segment big text, lists of keywords is generated, and lists of keywords is transmitted
Give concordance list construction procedures.
(3) concordance list construction procedures are called to carry out Hash operation to the lists of keywords of big text automatically, and based on key
Word Hash constructs keyword inverted index table, and keyword Hash is made to be directed toward the unique identification doc_id of big text.
The Retrieval Interface of contract can realize following function:
(1) according to about name variable legal person's parameter, name variable institute is found by the program of contract virtual machine automatically
Associated concordance list unique identification keywords_index_table_id, and by the unique identification, from distributed file system
It is middle to read corresponding concordance list.
(2) according to about keyword legal person's parameter, the cryptographic Hash keyword_hash of keyword is calculated, and pass through
Keyword_hash searches for concordance list, obtains the doc_id list answered；Then, according to doc_id list from distributed storage network
It is middle to read corresponding big text data list, and return to user, and system to big text data each in returning the result into
The hand-manipulating of needle calculates the matching degree of above-mentioned keyword, and obatained score is used to be ranked up to returning the result.
Distributed storage network includes but is not limited to following several: IPFS, Sia, Storj, Swarm.
Need to safeguard the unique identification of bigtext categorical variable name and concordance list in present embodiment in block chain contract
Corresponding relationship: keywords_index_table_name-> keywords_index_table_id；Corresponding relationship is by area
Corresponding relationship is automatically stored in the database of block chain by the contract virtual machine layer of block catenary system to safeguard；Intelligence is closed
About layer is only simple states bigtext variable, and parameter name is exactly to index table name keywords_index_table_name
Itself, to simplify contract exploitation.
The above-mentioned description to embodiment is for that can understand and apply the invention convenient for those skilled in the art.
Person skilled in the art obviously easily can make various modifications to above-described embodiment, and described herein general
Principle is applied in other embodiments without having to go through creative labor.Therefore, the present invention is not limited to the above embodiments, ability
Field technique personnel announcement according to the present invention, the improvement made for the present invention and modification all should be in protection scope of the present invention
Within.
Claims (8)
1. it is a kind of based on block chain and the storage of the big text of distributed storage, index and search method, include the following steps:
(1) by big text data store into distributed storage network, distributed storage network is that the distribution of big text data is unique
Doc_id is identified, and is addressed by data of the doc_id to big text；
(2) word segmentation processing is carried out to big text data, generates lists of keywords, and fall to arrange based on all keywords building keyword
Concordance list keywords_index_table makes each keyword Hash keyword_hash be directed toward unique mark of big text data
Know doc_id；
(3) by concordance list keywords_index_table storage into distributed storage network, and by its unique identification
Keywords_index_table_id and title keywords_index_table_name storage is specific into block chain network
In the data structure of intelligent contract；
(4) a kind of special type bigtext is established in intelligent contract, will be mapped as by the variable that the type is stated
Respective index table keywords_index_table in distributed storage network, name variable and manipulative indexing table
Keywords_index_table binding, and distributed storage is stored into together with name variable big text data relevant with variable
It in network, and obtains a unique identification and is addressed, while big text data can also be fabricated and index concordance list
In keywords_index_table.
2. big text storage, index and search method according to claim 1, it is characterised in that: the type bigtext
Name variable formulated according to the function that concordance list keywords_index_table is met, and and keywords_
Index_table_name is consistent.
3. big text storage, index and search method according to claim 1, it is characterised in that: the intelligence contract is opened
It is placed with write-in interface and Retrieval Interface, write-in interface is used to receive the parameter such as name variable and big text data, will be corresponding big
Text data is stored in distributed memory system and constructs concordance list keywords_index_table for it；Retrieval Interface is for connecing
By the parameter of parameter such as name variable and keyword, and return to qualified lists of documents.
4. big text storage, index and search method according to claim 3, it is characterised in that: the step (2) passes through
Following two program is realized:
Program is segmented, for carrying out word segmentation processing to big text data, generates lists of keywords, and lists of keywords is passed to
Concordance list construction procedures；
Concordance list construction procedures for carrying out Hash operation to lists of keywords, and are based on keyword Hash keyword_hash
Keyword inverted index table keywords_index_table is constructed, each keyword Hash keyword_hash is made to be directed toward big text
The unique identification doc_id of notebook data.
5. big text storage, index and search method according to claim 4, it is characterised in that: the intelligence contract is write
The concrete function of incoming interface realizes that process is as follows:
1.1, according to the parameter about name variable, are found associated by the name variable automatically by the program of contract virtual machine
Concordance list unique identification keywords_index_table_id read from distributed file system and by the unique identification
Take corresponding concordance list data；
1.2 automatic calling participle programs segment big text data, generate lists of keywords, and lists of keywords is transmitted
Give concordance list construction procedures；
1.3 automatic calling concordance list construction procedures carry out Hash operation to the lists of keywords of big text data, and based on key
Word Hash keyword_hash constructs keyword inverted index table keywords_index_table, makes keyword Hash
Keyword_hash is directed toward the unique identification doc_id of big text data.
6. big text storage, index and search method according to claim 4, it is characterised in that: the intelligence contract inspection
The concrete function of rope interface realizes that process is as follows:
2.1, according to the parameter about name variable, are found associated by the name variable automatically by the program of contract virtual machine
Concordance list unique identification keywords_index_table_id read from distributed file system and by the unique identification
Take corresponding concordance list data；
2.2, according to the parameter about keyword, calculate keyword Hash keyword_hash, and pass through keyword Hash
Keyword_hash searches for concordance list keywords_index_table, obtains corresponding doc_id list；Then, according to doc_
Corresponding big text data is read in id list from distributed storage network, and returns to user, and then to every in returning the result
A big text data calculate for the matching degree of keyword, and resulting matching degree score is used for the row of returning the result
Sequence.
7. the storage of big text, index and search method according to claim 1, it is characterised in that: in the step (4) when
After name variable and manipulative indexing table the keywords_index_table binding of type bigtext, in block chain intelligence contract
The corresponding relationship of middle maintenance its name variable and concordance list unique identification keywords_index_table_id.
8. the storage of big text, index and search method according to claim 7, it is characterised in that: the corresponding relationship is
It is safeguarded by the contract virtual machine in block catenary system, and automatically corresponding relationship is stored in the database of block chain, intelligence
Energy contract only needs the variable for simply stating type bigtext, and parameter name is to index table name keywords_index_
Table_name itself, to simplify contract exploitation.
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| CN109918375B (en) | 2021-07-30 |
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