object xml mappings
TRANSCRIPT
1. Introduction to ORM’s in the SQL world!
2. Object XML Mappings
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Enterprise Application Layers
Presentation Interaction
Domain Logic
Data Source Storage
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Enterprise Application Layers
Presentation Interaction
Domain Logic
Data Source Storage
ORM’s live here!
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Object Relational Mapping
Joost Diepenmaat 26
Jan Klaassen 24
John Doe 23
firstname lastname age
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Object Relational Mapping
Joost Diepenmaat 26
Jan Klaassen 24
John Doe 23
firstname lastname age Class Student
firstnamelastnameage
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Object Relational Mapping
Joost Diepenmaat 26
Jan Klaassen 24
John Doe 23
firstname lastname age Class Student
firstnamelastnameage
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ORM & ActiveRecord
"An object that wraps a row in a database table or view, encapsulates
the database access, and adds domain logic on that data."
- Martin Fowler
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Very short demo...
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More ORM!
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class Student < ActiveRecord::Base has_many :courses belongs_to :universityend
student = Student.find_by_name("Joost")student.courses #returns all courses
Associations
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class Student < ActiveRecord::Base validates_presence_of :firstname, :lastname validates_uniqueness_of :number validates_acceptance_of :terms_of_service validates_confirmation_of :passwordend
Validations
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✓Associations
✓Validations
✓Finders
✓Callbacks
✓Observers
✓Inheritance
✓Direct manipulation
✓Transactions
✓Database abstraction
✓etc. etc.
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• Java: Hibernate
• Ruby: ActiveRecord, DataMapper
• .Net: LINQ
• Python: Django’s ORM
• More, more, more....
ORM’s are popular
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ORM’s are SQL based.
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Complex XML standards
• OpenXML
• GIS
• Universal Business Language
• ebXML
• XBRL
• Healthcare XML
• Voice XML
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ORM’s do not support native XML storage.
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2. Object Relational XML Mappings
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Place XML in domain logic
into separate classes.
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<student> <name>Joost</name> <courses>
<course> <title>XML & DB I</title> <score>7</score> </course> <course> <title>XML & DB II</title> <score>9</score> </course>...
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<student> <name>Joost</name> <courses>
<course> <title>XML & DB I</title> <score>7</score> </course> <course> <title>XML & DB II</title> <score>9</score> </course>...
Class Student
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<student> <name>Joost</name> <courses>
<course> <title>XML & DB I</title> <score>7</score> </course> <course> <title>XML & DB II</title> <score>9</score> </course>...
Class Student
Class Course
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<student> <name>Joost</name> <courses>
<course> <title>XML & DB I</title> <score>7</score> </course> <course> <title>XML & DB II</title> <score>9</score> </course>...
Class Student
Class Course
student = Student.find_by_name("Joost")student.courses
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Thesis studies:
The possibilities of an OXM with XML/XPath as
a base language for storage.
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Research Questions
1. How can we extend RoR with XPath Accelerator to create an XML database for efficient XML storage and XPath processing?
2. How can we implement XML based Object Mapping on the XML database created?
3. What kind of XML related functionality can we add to the system?
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Object
Elements map
Pathfinder core
SQL storage
Student
tag “<student>”
XPath to SQL queries
pre | size | level
layer contains
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Elements MapUniversity
Pathfinder
SQL
ElementsRegister
ObjectMapping
ElementsMap
XPathQueries Etc.
Student CourseObjects
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Questions?
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