CN102760164A - Method for exchanging data between relation database management system and XML (Extensive Makeup Language) database management system - Google Patents
Method for exchanging data between relation database management system and XML (Extensive Makeup Language) database management system Download PDFInfo
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Abstract
The invention provides a method for exchanging data between a relation database management system and an XML (Extensive Makeup Language) database management system. The technical scheme of the invention can realize data exchange between the relation database management system and the XML database management system, update data in the management system of a management database, enable users to introduce the XML database management system to serve as a new data source of an information system on the premise of keeping the original relation database-based management system, so that the method yields the new information system value and keeps use value of historical data simultaneously and retains the interoperability of the two operating systems.
Description
Technical field
The present invention relates to field of computer technology, the method for exchanges data between particularly a kind of relational database management system and the XML data base management system (DBMS).
Background technology
XML (full name Extensible Markup Language); It is a kind of a kind of SGML that designs for intemet specially; And because its ability that has the various information of effectively expressing, data and make various applicating cooperation work; Become the de facto standard of data issuing and exchanges data already, therefore, XML had been developed in recent years and was using 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 (DBMS) (XMLDBMS) also is a kind of rapidly novel data base management system (DBMS) of development in recent years, and it meets W3C standard XML document data with storage and retrieval is the data base management system (DBMS) of target, and can upgrade XML document.Because its objects stored is the XML document storehouse, so XMLDBMS is exactly a kind of XML document storehouse in essence.
XML data base management system (DBMS) (XMLDBMS) is fast-developing in recent years a kind of novel data base management system (DBMS) (DBMS), and its storage and data retrieved are XML documents, and supports to upgrade XML document.Along with the XML standard is adopted as data exchange standard by increasing industry; The management of XML data (storage; Retrieval is upgraded etc.) demand can maintain sustained and rapid growth, and particularly XMLDBMS is fit to handle text class data and XML document data more than relational database management system.And relational database management system (relational database management system) since in the widespread use of IT industry decades; Though in market or its leading position of technical elements can not shake; And compare XMLDBMS, relational database management system has superiority when dealing with relationship data more.So above following DBMS market, XMLDBMS is will be with relational database management system (relational database management system) long-term and deposit.In various enterprises and other unit, with the situation that XMLDBMS and relational database management system long-term co-existence and collaborative work occur.
Query engine is the core subsystem in the data base management system (DBMS) (DBMS); Because XML is typical semi-structured data; Search request to the XML data is different from traditional database; When inquiry, not only to inquire about, and will inquire about the structure of XML document and the relation between the data to the numerical value in the database.Further investigation along with the XML correlation technique; The XML inquiry has possessed solid technical foundation on this basis; W3CWorldWideWebConsortium has proposed XML query language specification working draft-XQuery language Dec calendar year 2001; Up to now, the XQuery language is always in constantly developing.W3C becomes XQuery Data Model (XDM) for the data model of XQuery query language definition, and it is a kind of data model based on sequence, and promptly arbitrary data all is a sequence among the XQuery, 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, note node, processing instruction nodes).In this XMLDBMS, use node data table storage 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; Because the XML data managing capacity that a large amount of traditional relational database management systems that have been deployed in user's machine room do not have Native does not understand XMLDBMS fully yet, so the user can't push away or draw data in relational database management system inside from XMLDBMS; Perhaps draw data to XMLDBMS from relational database management system but but can in XMLDBMS, push away data conversely to 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 let XMLDBMS and relational database management system collaborative work, need a kind of mechanism of between these two kinds of DBMS systems, carrying out exchanges data.
Summary of the invention
For addressing the above problem, the method for exchanges data between a kind of relational database management system that technical scheme of the present invention provides and the XML data base management system (DBMS) comprises:
Step S1 a: built-in function is set in the query engine of said XML data base management system (DBMS);
Step S2: through said built-in function with said XML data base management system (DBMS) with said relational database management system is connected, and through said built-in function with the data query of XML data base management system (DBMS) with upgrade request and be sent in the said relational database management system;
Step S3: said relational database management system is back to said XML data base management system (DBMS) with request results;
Step S4: said XML data base management system (DBMS) is converted into described request results the XML document fragment with predefined set form;
Step S5: resolve described XML document fragment.
Alternatively, described built-in function through connection string with the XML data base management system (DBMS) with said relational database management system is connected.
Alternatively, said 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 said step S2, the data query of said XML data base management system (DBMS) asks to be sent to said relational database management system with the form of SQL statement with renewal.
Alternatively, in said step S3, said relational database management system is back to said XML data base management system (DBMS) with request results with the form of relation table.
Alternatively, in said step S4, the described request result is converted into the XML document fragment through said built-in function.
Alternatively, said step S5 is specially: said XML document fragment is delivered to the XML document resolver, and said XML document resolver splits into the XDM node element with said XML document fragment, and described XDM node element is stored in the interim node table.
Alternatively; The XDM that the XML node element that described XML document fragment with set form is some row by name is formed; Described row nodename is fixed; Inside comprises the plurality of sub node element, and said row node is corresponding to the delegation in the said relation table, and the daughter element node of said row node is listed as corresponding to one in the delegation in the said relation table.
Alternatively, described daughter element node has and only has the attribute of " type " by name, and said property value is the data type of said relation table respective column.
Alternatively, described daughter element node has and only has a text child node, and the row name of each row of the title of said each child node and said relation table is corresponding.
Compared with prior art, technique scheme has following advantage:
Technical scheme of the present invention can let data between relational database management system and XML data base management system (DBMS), exchange; And upgrade the data in the management data base management system; The user who is can keep under original prerequisite based on relational database management system; Introduce the data source of XML data base management system (DBMS) as new infosystem, kept in the time of performance fresh information system value historical data and use value, kept the interoperability of two kinds of operating systems simultaneously.
Description of drawings
Fig. 1 is the process flow diagram of the method for exchanges data between relational database management system and the XML data base management system (DBMS) of embodiment of the present invention.
Fig. 2 is the method synoptic diagram of exchanges data between relational database management system and the XML data base management system (DBMS) of embodiment of the present invention.
Embodiment
For make above-mentioned purpose of the present invention, feature and advantage can be more obviously understandable, does detailed explanation below in conjunction with the accompanying drawing specific embodiments of the invention.Set forth detail in the following description so that make much of the present invention.But the present invention can be different from alternate manner described here and implements with multiple, and those skilled in the art can do similar popularization under the situation of intension of the present invention.Therefore the present invention does not receive the restriction of following disclosed embodiment.
Those skilled in the art will appreciate that relational database management system is the administrative relationships databases, and with the system of data organization for relevant row and column, it was used widely in the IT industry already.XML data base management system (DBMS) main processing and tissue be text data and XML document data.Than the XML data base management system (DBMS), relational database management system has the advantage that hardly matches when organizing and dealing with relationship the type data.But,, can't realize mutual exchanges data between the two because relational database management system does not have local XML data managing capacity.
For solving the problems of the prior art, inventor of the present invention has proposed the method for exchanges data between a kind of relational database management system and the XML data base management system (DBMS) through research.Consult Fig. 1, Fig. 1 is the process flow diagram of the method for exchanges data between relational database management system and the XML data base management system (DBMS) of embodiment of the present invention.The method of exchanges data between the relational database management system of embodiment of the present invention and the XML data base management system (DBMS) comprises:
Step S1 a: built-in function is set in the query engine of said XML data base management system (DBMS);
Step S2: through said built-in function with said XML data base management system (DBMS) with said relational database management system is connected, and in being sent to the data query of XML data base management system (DBMS) and the request of upgrading in the said relational database management system through said built-in function;
Step S3: said relational database management system is back to said XML data base management system (DBMS) with request results;
Step S4: said XML data base management system (DBMS) is converted into described request results the XML document fragment with set form;
Step S5: resolve described XML document fragment.
Consult Fig. 2, Fig. 2 is the method synoptic diagram of exchanges data between relational database management system and the XML data base management system (DBMS) of embodiment of the present invention.To combine method that Fig. 2 specifically introduces exchanges data between a kind of relational database management system and the XML data base management system (DBMS) of embodiment of the present invention preferred embodiment below.
At first, get into step S1: in the query engine kernel of XML data base management system (DBMS), realize a built-in function, said built-in function is used to receive two parameters: connection string and SQL query statement, and return XML document fragment with set form.Wherein, Connection string comprises the URL/IP+ port numbers of relational database management system; Database name; Information such as username and password use the connection protocol of relational database management system (for example, the privately owned connection protocol of ODBC or other specific relational database management systems) to be connected with relational database management system to be used for the XML data base management system (DBMS).
Get into step S2: through said built-in function with said XML data base management system (DBMS) with said relational database management system is connected, and through said built-in function with the data query of XML data base management system (DBMS) with upgrade request and be sent in the said relational database management system;
Get into step S3: said relational database management system is back to said XML data base management system (DBMS) with request results.Wherein, the request results that relational database management system returns with the form of relation table (single atomic data also will be handled as relation table) therefore, need be converted into the XML data that the XML data base management system (DBMS) can be discerned with relation table.
Get into step S4: said XML data base management system (DBMS) is converted into described request results the XML document fragment with set form.Wherein, the built-in function in the XML data base management system (DBMS) is converted into relation table the XML document fragment with predefined set form.The XML document fragment with set form that said built-in function returns is following:
We can find out through above-mentioned XML document:
What built-in function returned is the sequence (XQuery data model) that some names are called the XML node element composition of row;
The delegation of the result's that described each row node returns corresponding to relational database management system relation table, and the title of row node is fixed;
The row node contains the experimental process node element, corresponds respectively to row (field) of corresponding line in the result's that relational database management system returns the relation table;
It is one by name that the daughter element node of row node has and only has " type " attribute, its property value is the data type of the respective column of the relation table that returns of relational database management system; The daughter element node of row node has and has only a text child node, no longer contains other any child nodes.
Simultaneously; Should be noted that; The title of the daughter element node of row node is used hereinbefore " field1 ", " field2 " waits and representes, but in fact their real name corresponds respectively to row name of each row of the result's that relational database management system returns relation table.Certain row fieldX of certain row of bitter relation table is NULL, representes that then this row node element does not contain fieldX daughter element node; If the return results row do not have title, the character string of using this form of giving tacit consent to of fieldX so is as title.
Like this, even what return is a value of atom, such as the rreturn value of Data Update/deletion/insertion operation of SQL, the rreturn value of call stored procedure, and the rreturn value of returning the query manipulation of single value of atom also can use above-mentioned form to represent.
(data type of this field is a character string) is positioned at when the type of field fieldX property value is string/text/clob/varchar/char (n)<fieldX>With</fieldX>Between all characters all be used as the character of character string.
Wherein, in embodiments of the present invention, the method that the result's that relational database management system is returned relation table converts the XML document fragment of above-mentioned form into be exactly according to this format description relation table line by line word for word section change.For example, the relation table shown in the table 1:
Table 1
| Name | Country | BirthDate | Major |
| LiLei | China | 1976-8-19 | English |
| JimGrey | UK | 1977-3-12 | History |
| Han?Meimei | China | 1977-11-25 | Economics |
Through built-in function, the result that the said built-in function in the query engine kernel of XMLDBMS returns RDBMS converts the XML document fragment into, that is:
Subsequently, get into step S5: said XML document fragment is delivered to the XML document resolver, and said XML document resolver splits into the XDM node element with said XML document fragment, and described XDM node element is stored in the interim node table.Like this, above-mentioned Query Result just is converted into the intermediate result that any one common xquery inquiry produces.This intermediate result just can be calculated the net result of an XQuery/SQL mixing inquiry by the xquery query engine as the method for the intermediate result of using any xquery subquery.
In the SQL query that mixes inquiry, can embed the result that the XQuery subquery returns, still, this result must be single project (item, single XDM node can atom turn to value of atom), cannot be a plurality of XDM projects (items).The mode that embeds is exactly in the SQL query character string, to use the character string joining method, and other parts that transfer XQuery subquery result to character string and SQL 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 let data between relational database management system and XML data base management system (DBMS), exchange; And upgrade the data in the management data base management system; The user who is can keep under original prerequisite based on relational database management system; Introduce the data source of XML data base management system (DBMS) as new infosystem, kept in the time of performance fresh information system value historical data and use value, kept the interoperability of two kinds of operating systems simultaneously.
Should be understood that described method and system can be with various forms of hardware, software, firmware, dedicated processor or their combination realization here.Especially, a part at least of the present invention comprises that the application program of programmed instruction preferably realizes.These programmed instruction positively are 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.) lining, and can be by any equipment or machine that comprises appropriate configuration, for example a kind of universal digital computer with processor, internal memory and input/output interface is carried out.It should also be understood that because the building block of some systems of describing in the accompanying drawing and treatment step are preferably realized with software so the connection between the system module (the perhaps logic flow of method step) maybe be different, 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.
More than disclose many aspects of the present invention and embodiment, it will be understood by those skilled in the art that others of the present invention and embodiment.Disclosed many aspects and embodiment just are used to illustrate among the present invention, are not to be to qualification of the present invention, and real protection domain of the present invention and spirit should be as the criterion with claims.
Claims (10)
1. the method for exchanges data between relational database management system and the XML data base management system (DBMS) is characterized in that, comprising:
Step S1: in said XML data base management system (DBMS), a built-in function is set;
Step S2: through said built-in function with said XML data base management system (DBMS) with said relational database management system is connected, and through said built-in function with the data query of XML data base management system (DBMS) with upgrade request and be sent in the said relational database management system;
Step S3: said relational database management system is back to said XML data base management system (DBMS) with request results;
Step S4: said XML data base management system (DBMS) is converted into described request results the XML document fragment with the set form of preestablishing;
Step S5: resolve described XML document fragment.
2. the method for exchanges data between relational database management system as claimed in claim 1 and the XML data base management system (DBMS); It is characterized in that, described built-in function through connection string with the XML data base management system (DBMS) with said relational database management system is connected.
3. the method for exchanges data between relational database management system as claimed in claim 2 and the data base management system (DBMS); It is characterized in that said connection string comprises URL/IP+ port numbers, database name, user name, the encrypted message of relationship by objective (RBO) data base management system (DBMS).
4. the method for exchanges data between relational database management system as claimed in claim 1 and the XML data base management system (DBMS); It is characterized in that; In said step S2, the data query of said XML data base management system (DBMS) asks to be sent to said relational database management system with the form of SQL statement with renewal.
5. the method for exchanges data between relational database management system as claimed in claim 1 and the XML data base management system (DBMS); It is characterized in that; In said step S3, said relational database management system is back to said XML data base management system (DBMS) with request results with the form of relation table.
6. the method for exchanges data is characterized in that between relational database management system as claimed in claim 1 and the XML data base management system (DBMS), in said step S4, through said built-in function the described request result is converted into the XML document fragment.
7. the method for exchanges data between relational database management system as claimed in claim 1 and the XML data base management system (DBMS); It is characterized in that; Said step S5 is specially: said XML document fragment is delivered to the XML document resolver; Said XML document resolver splits into the XDM node element with said XML document fragment, and described XDM node element is stored in the interim node table.
8. the method for exchanges data between relational database management system as claimed in claim 1 and the XML data base management system (DBMS); It is characterized in that; The XDM that the XML node element that described XML document fragment with set form is some row by name is formed, described row nodename is fixed, and inside comprises the plurality of sub node element; Said row node is corresponding to the delegation in the said relation table, and the daughter element node of said row node is listed as corresponding to one in the corresponding line in the said relation table.
9. the method for exchanges data between relational database management system as claimed in claim 8 and the XML data base management system (DBMS); It is characterized in that; Described daughter element node has and only has the attribute of " type " by name, and said property value is the data type of said relation table respective column.
10. like the method for exchanges data between claim 8 or 9 described relational database management systems and the XML data base management system (DBMS); It is characterized in that; Described daughter element node has and only has a text child node, and the row name of each row of the title of said each child node and said relation table is corresponding.
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