CN102760164B - A kind of method of exchanges data between relational database management system and XML data base management system - Google Patents
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Abstract
The invention provides the method for exchanges data between a kind of relational database management system and XML data base management system.Technical scheme of the present invention can allow data exchange between relational database management system and XML data base management system, and the data upgraded in management data base management system, the user being can be original under the prerequisite of relational database management system in reservation, introduce the data source of XML data base management system as new infosystem, remain while playing fresh information system value historical data and use value, maintain the interoperability of two kinds of operating systems simultaneously.
Description
Technical field
The present invention relates to field of computer technology, particularly a kind of method of exchanges data between relational database management system and XML data base management system.
Background technology
XML(full name ExtensibleMarkupLanguage), be a kind of be specially internet and a kind of markup language of designing, and due to its ability that there are the various information of effectively expressing, data and make various applicating cooperation work, already became the de facto standard of data publication and exchanges data, therefore, XML to be developed in recent years and to apply widely.The emphasis of XML does not lie in the form of data itself, and is management data information, and therefore, XML makes the unification of disparate databases pattern become possibility, for the integration problem of heterogeneous database provides approach.
XML data base management system (XMLDBMS) is also development in recent years a kind of novel data base management system (DBMS) rapidly, and it to store and retrieval meets the data base management system (DBMS) that the XML document data of W3C standard are target, and can upgrade XML document.Due to its store to as if XML document storehouse, therefore XMLDBMS is exactly a kind of XML document storehouse in essence.
XML data base management system (XMLDBMS) is a kind of novel data base management system (DBMS) (DBMS) fast-developing in recent years, and it stores and the data of retrieval are XML document, and supports to upgrade XML document.Along with XML standard is adopted as data exchange standard by increasing industry, the management of XML data (stores, retrieval, upgrades) demand can maintain sustained and rapid growth, and particularly XMLDBMS is applicable to process text class data and XML document data more than relational database management system.And relational database management system (relational database management system) is due to decades in the widespread use of IT industry, no matter can not shake in market or its leading position of technical elements, and compare XMLDBMS, relational database management system has superiority more when dealing with relationship data.So above the DBMS market in future, XMLDBMS will with relational database management system (relational database management system) Long Coexistence.In various enterprise and other unit, XMLDBMS and relational database management system long-term co-existence will be there is and the situation of collaborative work.
Query engine is the kernel subsystems in data base management system (DBMS) (DBMS), because XML is typical semi-structured data, traditional database is different to the search request of XML data, not only the numerical value in database to be inquired about when inquiring about, and will the relation between the structure of XML document and data be inquired about.Along with the further investigation of XML correlation technique, XML inquires about has possessed solid technical foundation on this basis, W3CWorldWideWebConsortium proposes XML query language specification working draft-XQuery language Dec calendar year 2001, up to now, XQuery language is always in constantly developing.W3C is that the data model of XQuery query language definition becomes XQueryDataModel(XDM), it is a kind of data model based on sequence, and namely in XQuery, arbitrary data is all a sequence, and sequence is made up of several orderly project (item's); An item is a value of atom or a node; A node is one of 7 kinds of nodes of XML document (document node, node element, attribute node, text node, name space node, comment nodes, processing instruction nodes).In this XMLDBMS, use node data table to store document node and node element, all the other 5 kinds of nodes are stored in the data line of its father's node element.
At present, the XML data managerial ability not having Native due to the traditional relational database management system being deployed in user's machine room does not in a large number understand XMLDBMS completely yet, so user cannot push away in relational database management system inside or draw data from XMLDBMS; But but can push away data conversely in XMLDBMS draws data to XMLDBMS to relational database management system or from relational database management system, this needs XMLDBMS to support to carry out with relational database management system the function of exchanges data.
In order to allow XMLDBMS and relational database management system collaborative work, need a kind of mechanism of carrying out exchanges data between these two kinds of DBMS systems.
Summary of the invention
For solving the problem, the method for exchanges data between a kind of relational database management system that technical solution of the present invention provides and XML data base management system, comprising:
Step S1 a: built-in function is set in the query engine of described XML data base management system;
Step S2: by described built-in function by described XML data base management system with described relational database management system is connected, and by described built-in function, the data query of XML data base management system and update request are sent in described relational database management system;
Step S3: request results is back to described XML data base management system by described relational database management system;
Step S4: described request results is converted into the XML document fragment with the set form preset by described XML data base management system;
Step S5: the XML document fragment described in parsing.
Alternatively, XML data base management system is connected with by described relational database management system by connection string by described built-in function.
Alternatively, described connection string comprises URL/IP+ port numbers, database name, user name, the encrypted message of relationship by objective (RBO) data base management system (DBMS).
Alternatively, in described step S2, data query and the update request of described XML data base management system are sent to described relational database management system with the form of SQL statement.
Alternatively, in described step S3, request results is back to described XML data base management system with the form of relation table by described relational database management system.
Alternatively, in described step S4, by described built-in function, described request results conversion is become XML document fragment.
Alternatively, described step S5 is specially: described XML document fragment is delivered to XML document resolver, and described XML document fragment is split into XDM node element by described XML document resolver, and is stored in a transient node table by described XDM node element.
Alternatively, the described XML document fragment with set form is the XDM of the XML node element composition of some row by name, described row nodename is fixed, inside comprises some daughter element nodes, described row node corresponds to a line in described relation table, and the daughter element node of described row node is corresponding to the row in a line in described relation table.
Alternatively, described daughter element node has and only has the attribute of one " type " by name, and described property value is the data type of described relation table respective column.
Alternatively, described daughter element node has and only has a text child node, and the title of described each child node is corresponding with the row name that described relation table respectively arranges.
Compared with prior art, technique scheme has lower advantage:
Technical scheme of the present invention can allow data exchange between relational database management system and XML data base management system, and the data upgraded in management data base management system, the user being can be original under the prerequisite of relational database management system in reservation, introduce the data source of XML data base management system as new infosystem, remain while playing fresh information system value historical data and use value, maintain the interoperability of two kinds of operating systems simultaneously.
Accompanying drawing explanation
Fig. 1 is the process flow diagram of the method for exchanges data between the relational database management system of embodiment of the present invention and XML data base management system.
Fig. 2 is the method schematic diagram of exchanges data between the relational database management system of embodiments of the present invention and XML data base management system.
Embodiment
For enabling above-mentioned purpose of the present invention, feature and advantage more become apparent, and are described in detail the specific embodiment of the present invention below in conjunction with accompanying drawing.Set forth detail in the following description so that fully understand the present invention.But the present invention can be different from alternate manner described here to implement with multiple, those skilled in the art can when without prejudice to doing similar popularization when intension of the present invention.Therefore the present invention is not by the restriction of following public embodiment.
Those skilled in the art will appreciate that relational database management system is administrative relationships databases, and be the system of relevant row and column by Organization of Data, it was used widely in IT industry already.XML data base management system mainly processes and what organize is text data and XML document data.Compared to XML data base management system, relational database management system organize and deal with relationship type data time there is the advantage hardly matched.But, because relational database management system does not have local XML data managerial ability, mutual exchanges data cannot be realized between the two.
For solving the problems of the prior art, the present inventor, through research, proposes the method for exchanges data between a kind of relational database management system and XML data base management system.Consult Fig. 1, Fig. 1 is the process flow diagram of the method for exchanges data between the relational database management system of embodiment of the present invention and XML data base management system.The method of exchanges data between the relational database management system of embodiment of the present invention and XML data base management system, comprising:
Step S1 a: built-in function is set in the query engine of described XML data base management system;
Step S2: described XML data base management system and described relational database management system are connected by described built-in function, and by described built-in function, the data query of XML data base management system and update request are sent in described relational database management system;
Step S3: request results is back to described XML data base management system by described relational database management system;
Step S4: described request results is converted into the XML document fragment with set form by described XML data base management system;
Step S5: the XML document fragment described in parsing.
Consult Fig. 2, Fig. 2 is the method schematic diagram of exchanges data between the relational database management system of embodiments of the present invention and XML data base management system.The method of exchanges data between a kind of relational database management system of embodiments of the present invention and XML data base management system is specifically introduced preferred embodiment below in conjunction with Fig. 2.
First, enter step S1: in the query engine kernel of XML data base management system, realize a built-in function, described built-in function is for receiving two parameters: connection string and SQL query statement, and returns the XML document fragment with set form.Wherein, connection string comprises the URL/IP+ port numbers of relational database management system, database name, the information such as username and password, the connection protocol (such as, the privately owned connection protocol of ODBC or other specific relational database management systems) of relational database management system is used to be connected with relational database management system for XML data base management system.
Enter step S2: by described built-in function by described XML data base management system with described relational database management system is connected, and by described built-in function, the data query of XML data base management system and update request are sent in described relational database management system;
Enter step S3: request results is back to described XML data base management system by described relational database management system.Wherein, request results that relational database management system returns using the form of relation table (single atomic data also will as relation table process), therefore, needs relation table to be converted into the XML data that XML data base management system can identify.
Enter step S4: described request results is converted into the XML document fragment with set form by described XML data base management system.Wherein, relation table is converted into the XML document fragment with the set form preset by the built-in function in XML data base management system.The XML document fragment of set form that what described built-in function returned have is as follows:
By above-mentioned XML document, we can find out:
What built-in function returned is the sequence (XQuery data model) that some names are called the XML node element composition of row;
Each described row node corresponds to a line of the relation table of the result that relational database management system returns, and the title of row node is fixing;
Row node contains several daughter element nodes, corresponds respectively to a row (field) of corresponding line in the relation table of the result that relational database management system returns;
The daughter element node of row node have and only have one be called " type " and attribute, its property value is the data type of the respective column of the relation table that relational database management system returns; The daughter element node of row node has and only has a text child node, no longer containing other any child nodes.
Simultaneously, it should be noted that, the title of the daughter element node of row node uses hereinbefore " field1 ", " field2 " etc. represent, but in fact their real name corresponds respectively to the row name of each row of the relation table of the result that relational database management system returns.If certain row fieldX of certain row of relation table is NULL, then represent this row node element not containing fieldX daughter element node; If return results certain row there is no title, so use the character string of this form of the fieldX of acquiescence as title.
Like this, even if what return is a value of atom, the rreturn value of the Data Update/deletion/update of such as SQL, the rreturn value of call stored procedure, and the rreturn value of query manipulation returning single value of atom, also can use above-mentioned form to represent.
When the type property value of a field fieldX is string/text/clob/varchar/char (n) (data type of this field is character string), all characters between <fieldX> and </fieldX> are all by the character as character string.
Wherein, in embodiments of the present invention, the method that the relation table of the result returned by relational database management system is converted to the XML document fragment of above-mentioned form be exactly according to this form describe relation table line by line word for word section change.Such as, the relation table shown in table 1:
Table 1
By built-in function, the results conversion that RDBMS returns by the described built-in function in the query engine kernel of XMLDBMS is XML document fragment, that is:
Subsequently, enter step S5: described XML document fragment is delivered to XML document resolver, described XML document fragment is split into XDM node element by described XML document resolver, and is stored in a transient node table by described XDM node element.Like this, above-mentioned Query Result is just converted into any one common xquery and inquires about the intermediate result produced.This intermediate result just can be calculated the net result of an XQuery/SQL mixing inquiry by the method for xquery query engine as using the intermediate result of any xquery subquery.
The result that XQuery subquery returns can be embedded in the SQL query of mixing inquiry, but, this result must be single project (item, single XDM node can atom turn to value of atom), cannot be multiple XDM projects (items).The mode embedded uses string-concatenation method exactly in SQL query character string, and other parts that XQuery subquery results transfers character string and SQL to are spliced into a complete inquiry string.
In sum, technical scheme of the present invention has following advantage:
Technical scheme of the present invention can allow data exchange between relational database management system and XML data base management system, and the data upgraded in management data base management system, the user being can be original under the prerequisite of relational database management system in reservation, introduce the data source of XML data base management system as new infosystem, remain while playing fresh information system value historical data and use value, maintain the interoperability of two kinds of operating systems simultaneously.
Should be understood that method and system as described herein can realize in hardware in a variety of manners, software, firmware, dedicated processor or their combination.Especially, the application program that a part at least of the present invention comprises programmed instruction preferably realizes.These programmed instruction are positively included in one or more program storage device and (are included but not limited to hard disk, magnetic floppy disc, RAM, ROM, CD, ROM etc.) inner, and can by any equipment or the machine that comprise appropriate configuration, such as a kind of universal digital computer with processor, internal memory and input/output interface performs.It should also be understood that the building block of some systems owing to describing in accompanying drawing and treatment step are preferably with software simulating, so the connection between system module (or logic flow of method step) may be different, and this depends on programming mode of the present invention.According to guidance given here, those of ordinary skill in the related art can design these and similar embodiment of the present invention.
Disclosed above many aspects of the present invention and embodiment, it will be understood by those skilled in the art that other side of the present invention and embodiment.Many aspects disclosed in the present invention and embodiment are just for illustrating, be not limitation of the invention, real protection domain of the present invention and spirit should be as the criterion with claims.
Claims (6)
1. the method for exchanges data between relational database management system and XML data base management system, is characterized in that, comprising:
Step S1 a: built-in function is set in described XML data base management system, described built-in function is for receiving two parameters: connection string and SQL query statement, wherein, described connection string comprises URL/IP+ port numbers, database name, user name, the encrypted message of relationship by objective (RBO) data base management system (DBMS);
Step S2: described XML data base management system and described relational database management system are connected by described connection string, and by described SQL query statement, the data query of XML data base management system and update request are sent in described relational database management system;
Step S3: request results is back to described XML data base management system by described relational database management system;
Step S4: described request results is converted into the XML document fragment having and preset set form by described XML data base management system by described built-in function;
Step S5: the XML document fragment described in parsing.
2. the method for exchanges data between relational database management system and XML data base management system as claimed in claim 1, it is characterized in that, in described step S3, request results is back to described XML data base management system with the form of relation table by described relational database management system.
3. the method for exchanges data between relational database management system and XML data base management system as claimed in claim 1, it is characterized in that, described step S5 is specially: described XML document fragment is delivered to XML document resolver, described XML document fragment is split into XDM node element by described XML document resolver, and is stored in a transient node table by described XDM node element.
4. the method for exchanges data between relational database management system and XML data base management system as claimed in claim 1, it is characterized in that, the described XML document fragment with set form is the XDM of the XML node element composition of some row by name, described row nodename is fixed, inside comprises some daughter element nodes, described row node corresponds to a line in relation table, and the daughter element node of described row node is corresponding to the row in the corresponding line in described relation table.
5. the method for exchanges data between relational database management system and XML data base management system as claimed in claim 4, it is characterized in that, described daughter element node has and only has the attribute of one " type " by name, and its property value is the data type of described relation table respective column.
6. the relational database management system as described in claim 4 or 5 and the method for exchanges data between XML data base management system, it is characterized in that, described daughter element node has and only has a text child node, and the title of described each daughter element node is corresponding with the row name that described relation table respectively arranges.
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| US20150293946A1 (en) * | 2014-04-09 | 2015-10-15 | City University Of Hong Kong | Cross model datum access with semantic preservation for universal database |
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| CN104657443A (en) * | 2015-02-04 | 2015-05-27 | 国家电网公司 | XML (extensive markup language) native database-based hybrid access method for power network data model |
| CN106557568B (en) * | 2016-11-14 | 2019-05-21 | 中国电子科技集团公司第二十八研究所 | The processing method of XML file format and the relational database conversion of pattern match |
| CN109962808B (en) * | 2017-12-26 | 2022-03-04 | 北京世纪东方智汇科技股份有限公司 | Data interaction processing method and system |
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| CN100476810C (en) * | 2005-05-08 | 2009-04-08 | 浙江大学 | Method for implementing automatic exchange of information system data |
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| CN102411598B (en) * | 2011-07-29 | 2013-07-31 | 株洲南车时代电气股份有限公司 | Method and system for realizing data consistency |
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| WO2004100021A3 (en) * | 2003-05-01 | 2004-12-29 | Oracle Int Corp | Retaining hierarchical information in mapping between xml documents and relational data |
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| CN101719156A (en) * | 2009-12-30 | 2010-06-02 | 南开大学 | System of seamless integrated pure XML query engine in relational database |
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