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XML Databases
XML Databases
XML Databases
XML Databases
XML Databases
XML Databases
XML Databases
XML Databases
XML Databases
XML Databases
XML Databases
XML Databases
XML Databases
XML Databases
XML Databases
XML Databases
XML Databases
XML Databases
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XML Databases

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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=&quot;Homer&quot; lastname=&quot;Simpson&quot;/ >
  • 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=&quot;1.0&quot;?>
    • <soap:Envelope
    • xmlns:soap=&quot;http://www.w3.org/2001/12/soap-envelope&quot;
    • soap:encodingStyle=&quot;http://www.w3.org/2001/12/soap-encoding&quot;>
    • <soap:Body xmlns:m=&quot;http://www.example.org/stock&quot;>
    • <m:GetStockPrice>
    • <m:StockName>IBM</m:StockName>
    • </m:GetStockPrice>
    • </soap:Body>
    • </soap:Envelope>
  • 17. SOAP Example: Response
    • <?xml version=&quot;1.0&quot;?>
    • <soap:Envelope
    • xmlns:soap=&quot;http://www.w3.org/2001/12/soap-envelope&quot;
    • soap:encodingStyle=&quot;http://www.w3.org/2001/12/soap-encoding&quot;>
    • <soap:Body xmlns:m=&quot;http://www.example.org/stock&quot;>
    • <m:GetStockPriceResponse>
    • <m:Price>34.5</m:Price>
    • </m:GetStockPriceResponse>
    • </soap:Body>
    • </soap:Envelope>
  • 18. THANK YOU!

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