XML Databases
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There are similarities between XML and databases in terms of storage, querying, and APIs. Storing XML in databases allows for indexing, efficient storage, and support for multiple users, transactions, security, and locking. XML documents can be stored in databases either as data-centric or document-centric documents. Data-centric XML is usually generated by systems and element order does not matter, while document-centric XML has unpredictable structure and element order is important. Native XML databases store XML as the fundamental unit, while XML-enabled databases convert XML to a database model, which can result in loss of information like element order. Web services use XML languages like SOAP and WSDL to enable interoperable machine-to-machine communication over
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- 1. XML and Databases Jussi Pohjolainen TAMK University of Applied Sciences
- 2. Similarities between XML and DB Database XML Storage XML-document DB model (relational) DTD and/or Schema Query Language (SQL) XQuery, XPath DB API (JDBC) DOM and SAX
- 3. Database Benefits XML "environment" lacks techniques that are built in into DBs: Indexing Efficient storage Support for multiple users Transactions Security Locking
- 4. Storing XML into DB XML-documents can be stored into DB When storing xml into DB one must clarify the type of xml.. XML-document types: Data centric Document centric
- 5. Data Centric vs. Document Centric? Data centric Usually generated by some system. Server similar function to a database Usually it does not matter in which order sibling-elements are. Examples: books.xml Document centric Document focus Does not have predictable structure Usually the order of elements are crucial Examples: xhtml
- 6. DB Types Database can be XML-enabled DB Information in DB is NOT in XML Requires a layer that converts XML to DB model Problem: can lost information about the xml-document (order) Use with Data Centric documents! Native XML XML is the fundamental unit of storage Does not lose any information Can be used with Data centric and Document centric documents!
- 7. Loss of Information? When using XML-enabled DBs, xml document is transformed from xml to db model. When transforming, it is possible that some information will be lost. Order of sibling elements Order of attributes But this does not matter, if the xml is data centric!
- 8. Designing XML – document for DB The use of elements? <customer> <firstname>Homer</firstname> <lastname>Simpson</lastname> </customer> The use of attributes? <customer firstname="Homer" lastname="Simpson"/ >
- 9. Attribute vs. Element Readability matter of opinion Types Schema: just the same DTD: with dtd you can define more detailed datatypes for attributes Programming DOM and SAX programming is easier if the xml uses attributes Document size When using attributes, the size of the xml – document is smaller Compatibility with DB When using attributes, xml document is closer to relational databases..
- 10. MySQL and XML Exporting xml – data mysqldump --xml databasename [tables] http://dev.mysql.com/doc/refman/6.0/en/mysqldump.html Importing xml – data LOAD XML (Only with MYSQL 6) http://dev.mysql.com/doc/refman/6.0/en/load-xml.html
- 11. WEB SERVICE
- 12. Problem in the Internet Client B2C Website Partner Partner Partner xhtml e-mail phone e-mail
- 13. Solution Client B2C Website Partner Partner Partner xhtml xml xml xml
- 14. Web Service Web Service: a software system designed to support interoperable machine-to-machine interaction over a network Communication system for different machines, platforms and programming languages Service requester -> Service provider
- 15. XML? Web Service technology uses following XML – languages SOAP (Simple Object Access Protocol) SOAP is xml – language used when communicating with provider and requester WSDL (Web Service Description Language) WSDL is xml – language which is used to describe the service
- 16. SOAP Example: Request <?xml version="1.0"?> <soap:Envelope xmlns:soap="http://www.w3.org/2001/12/soap-envelope" soap:encodingStyle="http://www.w3.org/2001/12/soap-encoding"> <soap:Body xmlns:m="http://www.example.org/stock"> <m:GetStockPrice> <m:StockName>IBM</m:StockName> </m:GetStockPrice> </soap:Body> </soap:Envelope>
- 17. SOAP Example: Response <?xml version="1.0"?> <soap:Envelope xmlns:soap="http://www.w3.org/2001/12/soap-envelope" soap:encodingStyle="http://www.w3.org/2001/12/soap-encoding"> <soap:Body xmlns:m="http://www.example.org/stock"> <m:GetStockPriceResponse> <m:Price>34.5</m:Price> </m:GetStockPriceResponse> </soap:Body> </soap:Envelope>
- 18. THANK YOU!