CN103186541B - A kind of mapping relations generate method and device - Google Patents
A kind of mapping relations generate method and device Download PDFInfo
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Abstract
The invention discloses a kind of mapping relations and generate method, be used for generating field level mappings relation, it is simple to the metadata in ETL is safeguarded automatically.Described method includes: SQL SQL program carries out syntactic analysis, extracts the SQL infrastructure elements object in SQL syntax tree；The described SQL infrastructure elements object extracted is numbered according to appearance order and stores；Non-definition SQL infrastructure elements object in described SQL infrastructure elements object is replaced with definition SQL infrastructure elements object, and stores according to described numbering；Numbering and respective rule according to the described SQL infrastructure elements object after numbering generate mapping relations.The invention also discloses the device for realizing described method.
Description
Technical field
The present invention relates to computer and database field, generate method and dress particularly to a kind of mapping relations
Put.
Background technology
ETL (Extraction-Transformation-Loading, data pick-up, change and load) technology is born
Blame during data such as relation data, flat data file etc. that be distributed, in heterogeneous data source are drawn into temporarily
Be carried out after interbed, change, integrated, be finally loaded in data warehouse or Data Mart, become online
Analyzing and processing, the basis of data mining.
It is being main ETL skill with SQL (Structured Query Language, SQL) script
In art, whenever ETL program is before exploitation or before amendment, it is required for the table of manual maintenance origin system, field
And the relation between table in data warehouse, field, so easily causes maintenance information with actual information not
Synchronize, cause the relation information between these tables, field inaccurate.
Present inventor, during realizing the embodiment of the present application technical scheme, at least finds prior art
The following technical problem of middle existence:
By MAPPING (mapping) tool maintenance field mapping relations in prior art, and automatically generate ETL
Required SQL script.But when the maintained personnel of SQL directly revise, the word in MAPPING instrument
Section mapping relations need attendant to carry out safeguarding amendment while having revised program, add artificial one-tenth
This, and operation more inconvenience.
Summary of the invention
The embodiment of the present invention provides a kind of mapping relations to generate method and device, is used for generating field level mappings and closes
System, it is simple to the metadata in ETL is safeguarded automatically.
A kind of mapping relations generate method, comprise the following steps:
SQL SQL program is carried out syntactic analysis, extracts the SQL base in SQL syntax tree
Plinth element object；
The described SQL infrastructure elements object extracted is numbered according to appearance order and stores；
Non-definition SQL infrastructure elements object in described SQL infrastructure elements object is replaced with definition
SQL infrastructure elements object, and store according to described numbering；
Mapping relations are generated according to the described SQL infrastructure elements object after numbering and respective rule.
A kind of mapping relations generating means, including:
Analyzing module, for SQL program being carried out syntactic analysis, extracting the SQL base in SQL syntax tree
Plinth element object；
First processing module, for carrying out the described SQL infrastructure elements object extracted according to appearance order
Number and store；
Second processing module, for by the non-definition SQL basis unit in described SQL infrastructure elements object
Element object replaces with definition SQL infrastructure elements object, and stores according to described numbering；
Matching module, reflects for generating according to the described SQL infrastructure elements object after numbering and respective rule
Penetrate relation.
Mapping relations generation method in the embodiment of the present invention, for SQL program is carried out syntactic analysis, is extracted
SQL infrastructure elements object in SQL syntax tree；By the described SQL infrastructure elements object of extraction according to going out
Now order is numbered and stores；By the non-definition SQL basis unit in described SQL infrastructure elements object
Element object replaces with definition SQL infrastructure elements object, and stores according to described numbering；According to volume
Described SQL infrastructure elements object and respective rule after number generate mapping relations.By in SQL syntax tree
Infrastructure elements object extraction out, generates mapping relations, reflecting of generation further according to respective rule after processing
The relation of penetrating can cover field level, and such mapping relations granularity is relatively thin, can meet field level impact property
Analyze and the demand of consanguinity analysis, it is simple to the metadata information in ETL is safeguarded automatically.
Accompanying drawing explanation
Fig. 1 is the primary structure figure of mapping relations generating means in the embodiment of the present invention；
Fig. 2 is the broad flow diagram that in the embodiment of the present invention, mapping relations generate method.
Detailed description of the invention
Mapping relations generation method in the embodiment of the present invention, for SQL program is carried out syntactic analysis, is extracted
SQL infrastructure elements object in SQL syntax tree；By the described SQL infrastructure elements object of extraction according to going out
Now order is numbered and stores；By the non-definition SQL basis unit in described SQL infrastructure elements object
Element object replaces with definition SQL infrastructure elements object, and stores according to described numbering；According to volume
Described SQL infrastructure elements object and respective rule after number generate mapping relations.By in SQL syntax tree
Infrastructure elements object extraction out, generates mapping relations, reflecting of generation further according to respective rule after processing
The relation of penetrating can cover field level, and such mapping relations relation granularity is relatively thin, can meet field level shadow
Ring property analysis and the demand of consanguinity analysis, it is simple to the metadata information in ETL is safeguarded automatically.
One complicated SQL, it may be possible to be made up of many sub-SQL.SQL the most basic, atom
May be made up of infrastructure elements such as SQL keyword, field, table, functions.For complete documentation SQL as far as possible
In each infrastructure elements and between relation, thus produce the other mapping relations of field level, use original respectively
SQL, sub-SQL, table, field, scalar, assert and these objects of condition to store SQL basis unit
Element.
Original SQL: the SQL of actual motion in record ETL, including source code, operation time, resolve feelings
The information such as condition.
Sub-SQL: original SQL is split as step by step many sub-SQL, such as the SQL in subquery.
Table: the table used by current SQL, is reused table repeatedly and can record repeatedly.Each SQL
The table of middle inquiry or impact all records in this object.The type of this object is probably physical table, view or one
Individual subquery ID.
Field: the field in the table used by current SQL, the field being not used by can not record, weight
The multiple field used can record repeatedly.
Scalar: the field of SQL data type, function, constant or by between them can be returned in SQL
Combination in any composition expression formula.Owing to combination scalar expression can comprise scalar, thus there is multilamellar and pass
Returning, for the ease of analyzing, the scalar in the embodiment of the present invention refers to outermost combination scalar.
Assert: the logical expression being made up of one or more scalar expressions and coupling keyword, it returns
Result be true or false.Such as: select*from tableAwhere col1=2, wherein, col1=2, i.e.
It is one to assert.
Condition: one or more one group of filtercondition of composition of asserting, is row collection data filtering in query statement
Expression formula.
Seeing Fig. 1, in the embodiment of the present invention, mapping relations generating means includes analyzing at module 101, first
Reason module the 102, second processing module 103 and matching module 104.Described device can also include storing mould
Block 105.
Analyze module 101 and be used for SQL program is carried out syntactic analysis, extract the SQL in SQL syntax tree
Infrastructure elements object.Analyze module 101 and build the syntax tree that the SQL in ETL is used, i.e. to SQL
Carry out syntactic analysis, determine when SQL is errorless, i.e. syntax tree builds complete, continues to enter described syntax tree
Line reconstruction, i.e. extracts the SQL infrastructure elements object in SQL syntax tree, it is also possible to the institute that will extract
State SQL infrastructure elements object to store, can leave in memory module 105.Described SQL basis
Element object refers to the sub-SQL in SQL, table, field, scalar, asserts.
First processing module 102 is for entering the described SQL infrastructure elements object extracted according to appearance order
Line number also stores.When analyzing module 101 and extracting the SQL infrastructure elements object in SQL syntax tree,
Can there is the sequencing of extraction, the first processing module 102 can be according to this sequencing to described SQL
Infrastructure elements object is numbered, and is then stored by the SQL infrastructure elements object after numbering, permissible
Leave in memory module 105.Concrete, in the embodiment of the present invention, the first processing module 102 is to extraction
SQL infrastructure elements object be numbered after, it can be replaced with TMP (temporarily) element pair respectively
As, and will replace after TMP element object store according to described numbering, storage mould can be left in
In block 105.For being likely to occur the expression formula of recurrence, can only record its outer layer expression formula object, such as:
Func_a (func_b (col_1, col_2), then can record ": func_a (func_b (col_1, col_2) " overall
As a scalar, and record recurrence relation inside it the most respectively.
Second processing module 103 is for by the non-definition SQL basis in described SQL infrastructure elements object
Element object replaces with definition SQL infrastructure elements object, and stores according to described numbering.Described
Non-definition SQL infrastructure elements object refers to not determine the SQL infrastructure elements object of meaning, definition
SQL infrastructure elements object refers to determine the SQL infrastructure elements object of meaning.Such as, described SQL base
" * " in plinth element object is non-definition SQL infrastructure elements object, because indefinite its refers to actually
For what content, then can be according to concrete SQL statement, by this type of non-definition SQL infrastructure elements object
Replace with definition SQL infrastructure elements object, and according to before this to non-definition SQL infrastructure elements object
Number order will replace after definition SQL infrastructure elements object leave relevant position in.Such as: SQL
Running environment has table Ta (field: fa1, fa2), then sql like language " SELECT*FROM Ta "
In " * " be non-definition SQL infrastructure elements object, need the specific environment run according to this SQL
Know that Ta table comprises two fields fa and fa2, and " * " represents all fields of Ta table, then by " * "
Replace with the SQL infrastructure elements object that fa1 and fa2 two determines.Second processing module 103 can circulate
Process TMP element object, replace the non-definition SQL infrastructure elements pair in described TMP element object
As, and create the SQL infrastructure elements object corresponding to described TMP element object, after it is numbered
Again the described SQL infrastructure elements object after numbering is stored.
Concrete, in the embodiment of the present invention, SQL infrastructure elements object is replaced by the first processing module 102
For TMP element object, then the second processing module 103 can be by TMP element object non-clearly
Property TMP element object replace with definition TMP element object, further according to replace after TMP element pair
As being respectively created corresponding SQL infrastructure elements object, it is possible to the SQL infrastructure elements pair that will create
As storing according to number order before, can leave in memory module 105.
Matching module 104 is for generating according to the described SQL infrastructure elements object after numbering and respective rule
Mapping relations.The SQL infrastructure elements object of storage is processed by matching module 104 according to SQL standard engine
The algorithm of table, field result set etc., the order occurred in SQL according to field, i.e. according to numbering by SQL
Infrastructure elements object mates one by one, generates table mapping relations and the mapping relations of field level respectively, and can
The mapping relations of generation to be stored in memory module 105, i.e. matching module 104 is counting according to SQL
According to the operational rule in storehouse and order of operation, generate table mapping relations and field mapping relations respectively.Such as,
Matching module 104 can generate SQL infrastructure elements object according to the rule searching Auto-matching of SQL92 standard
Between mapping relations.
Introduce the mapping relations in the embodiment of the present invention below by way of specific embodiment and generate method.
Seeing Fig. 2, the main method flow process that in the embodiment of the present invention, mapping relations generate is as follows:
Step 201: SQL program carries out syntactic analysis, extracts the SQL basis unit in SQL syntax tree
Element object.
Step 202: the described SQL infrastructure elements object extracted is numbered according to appearance order and stores.
Step 203: the non-definition SQL infrastructure elements object in described SQL infrastructure elements object is replaced
It is changed to definition SQL infrastructure elements object, and stores according to described numbering.
Step 204: generate mapping relations according to the described SQL infrastructure elements object after numbering and respective rule.
Mapping relations generation method in the embodiment of the present invention, for SQL program is carried out syntactic analysis, is extracted
SQL infrastructure elements object in SQL syntax tree；By the described SQL infrastructure elements object of extraction according to going out
Now order is numbered and stores；By the non-definition SQL basis unit in described SQL infrastructure elements object
Element object replaces with definition SQL infrastructure elements object, and stores according to described numbering；According to volume
Described SQL infrastructure elements object and respective rule after number generate mapping relations.By in SQL syntax tree
Infrastructure elements object extraction out, generates mapping relations, reflecting of generation further according to respective rule after processing
The relation of penetrating can cover field level, and such mapping relations relation granularity is relatively thin, can meet field level shadow
Ring property analysis and the demand of consanguinity analysis, it is simple to the metadata information in ETL is safeguarded automatically.
Those skilled in the art are it should be appreciated that embodiments of the invention can be provided as method, system or meter
Calculation machine program product.Therefore, the present invention can use complete hardware embodiment, complete software implementation or knot
The form of the embodiment in terms of conjunction software and hardware.And, the present invention can use and wherein wrap one or more
Computer-usable storage medium containing computer usable program code (include but not limited to disk memory and
Optical memory etc.) form of the upper computer program implemented.
The present invention is with reference to method, equipment (system) and computer program product according to embodiments of the present invention
The flow chart of product and/or block diagram describe.It should be understood that can by computer program instructions flowchart and
/ or block diagram in each flow process and/or flow process in square frame and flow chart and/or block diagram and/
Or the combination of square frame.These computer program instructions can be provided to general purpose computer, special-purpose computer, embedding
The processor of formula datatron or other programmable data processing device is to produce a machine so that by calculating
The instruction that the processor of machine or other programmable data processing device performs produces for realizing at flow chart one
The device of the function specified in individual flow process or multiple flow process and/or one square frame of block diagram or multiple square frame.
These computer program instructions may be alternatively stored in and computer or the process of other programmable datas can be guided to set
In the standby computer-readable memory worked in a specific way so that be stored in this computer-readable memory
Instruction produce and include the manufacture of command device, this command device realizes in one flow process or multiple of flow chart
The function specified in flow process and/or one square frame of block diagram or multiple square frame.
These computer program instructions also can be loaded in computer or other programmable data processing device, makes
Sequence of operations step must be performed to produce computer implemented place on computer or other programmable devices
Reason, thus the instruction performed on computer or other programmable devices provides for realizing flow chart one
The step of the function specified in flow process or multiple flow process and/or one square frame of block diagram or multiple square frame.
Obviously, those skilled in the art can carry out various change and modification without deviating from this to the present invention
Bright spirit and scope.So, if the present invention these amendment and modification belong to the claims in the present invention and
Within the scope of its equivalent technologies, then the present invention is also intended to comprise these change and modification.
Claims (7)
1. mapping relations generate method, it is characterised in that comprise the following steps:
SQL SQL program is carried out syntactic analysis, extracts the SQL base in SQL syntax tree
Plinth element object；
The described SQL infrastructure elements object extracted is numbered according to appearance order and stores；
Non-definition SQL infrastructure elements object in described SQL infrastructure elements object is replaced with definition
SQL infrastructure elements object, and store according to described numbering；Wherein, non-definition SQL basis unit
Element object is the SQL infrastructure elements object not determining meaning, and definition SQL infrastructure elements object is for having
Determine the SQL infrastructure elements object of meaning；
Generate mapping relations according to the described SQL infrastructure elements object after numbering and respective rule, specifically wrap
Include: according to SQL operational rule in data base and order of operation, generate table mapping relations and word respectively
Section mapping relations；
Wherein, described SQL infrastructure elements object at least includes the sub-SQL in SQL, table, field, mark
Measure and assert.
2. the method for claim 1, it is characterised in that extract the SQL in SQL syntax tree
The step of infrastructure elements object includes: reconstruct SQL syntax tree, implants JAVA code in described SQL
Rear acquisition described SQL infrastructure elements object.
3. the method for claim 1, it is characterised in that the described SQL infrastructure elements that will extract
The step that object is numbered according to appearance order and stores includes: the described SQL infrastructure elements that will extract
After object is numbered according to appearance order, the described SQL infrastructure elements object after numbering is replaced with and faces
Time TMP element object, and store according to described numbering.
4. method as claimed in claim 3, it is characterised in that by described SQL infrastructure elements object
Non-definition SQL infrastructure elements object replace with definition SQL infrastructure elements object, and according to described
The step that numbering carries out storing includes: by the non-determined TMP infrastructure elements pair in described TMP element object
TMP infrastructure elements object is determined, according to described determining TMP infrastructure elements object after replacing as replacing with
Create corresponding SQL infrastructure elements object, and store according to described numbering.
5. a mapping relations generating means, it is characterised in that including:
Analyzing module, for SQL program being carried out syntactic analysis, extracting the SQL base in SQL syntax tree
Plinth element object；
First processing module, for carrying out the described SQL infrastructure elements object extracted according to appearance order
Number and store；
Second processing module, for by the non-definition SQL basis unit in described SQL infrastructure elements object
Element object replaces with definition SQL infrastructure elements object, and stores according to described numbering；Wherein,
Non-definition SQL infrastructure elements object is the SQL infrastructure elements object not determining meaning, definition SQL
Infrastructure elements object is the SQL infrastructure elements object having and determining meaning；
Matching module, generates for the numbering according to described SQL infrastructure elements object and respective rule and maps
Relation, specifically for: according to SQL operational rule in data base and order of operation, generate table respectively
Mapping relations and field mapping relations；
Wherein, described SQL infrastructure elements object at least includes the sub-SQL in SQL, table, field, mark
Measure and assert.
6. device as claimed in claim 5, it is characterised in that described analysis module is specifically for reconstruct
SQL syntax tree, obtains described SQL infrastructure elements object after implanting JAVA code in described SQL.
7. device as claimed in claim 5, it is characterised in that described first processing module specifically for
After the described SQL infrastructure elements object extracted is numbered according to appearance order, described in after numbering
SQL infrastructure elements object replaces with interim TMP element object, and stores according to described numbering.
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| CN107169023A (en) * | 2017-04-07 | 2017-09-15 | 广东精点数据科技股份有限公司 | Data lineage analysis system and method based on sql semantic automatic analysis |
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| CN107644073A (en) * | 2017-09-18 | 2018-01-30 | 广东中标数据科技股份有限公司 | A kind of field consanguinity analysis method, system and device based on depth-first traversal |
| CN110147396B (en) * | 2017-11-08 | 2021-08-31 | 中移(苏州)软件技术有限公司 | Mapping relation generation method and device |
| CN109344173B (en) * | 2018-09-10 | 2022-03-15 | 创新先进技术有限公司 | Data management method and device and data structure |
| CN109582691B (en) * | 2018-11-15 | 2023-04-07 | 百度在线网络技术（北京）有限公司 | Method and apparatus for controlling data query |
| CN109710703A (en) * | 2019-01-03 | 2019-05-03 | 北京顺丰同城科技有限公司 | A kind of generation method and device of genetic connection network |
| CN110096513B (en) * | 2019-04-10 | 2024-05-28 | 创新先进技术有限公司 | Data query and fund check method and device |
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Effective date of registration: 20191209 Address after: P.O. Box 31119, grand exhibition hall, hibiscus street, 802 West Bay Road, Grand Cayman, Cayman Islands Patentee after: Innovative advanced technology Co., Ltd Address before: Cayman Islands Grand Cayman capital building, a four storey No. 847 mailbox Patentee before: Alibaba Group Holding Co., Ltd. |