JSON and Graph model - University of Helsinki

JSON and Graph model

Lecturer: Jiaheng Lu Autumn 2016

helsinki.fi

21.11.2016

1

Review and outline

? History of databases (Why we use databases)

? Data models

? Three features of data models ? Relational model ? Semi-structure model

XML model JSON model

? Graph model

helsinki.fi

Trends in XML and JSON usage

80% 70% 60% 50% 40% 30% 20% 10% 0%

2006 2007 2008 2009

XML JSON

2010 2011 2012 2013

Based on directory of 11,000 web APIs listed at Programmable Web, December 2013

Wow! I better have expertise in both XML and JSON

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Example of XML-formatted data

The below XML document contains data about a book: its title, authors, date of publication, and publisher.

Parsing Techniques Dick Grune Ceriel J.H. Jacobs 2007 Springer

helsinki.fi

Same data, JSON-formatted

{ "Book": { "Title": "Parsing Techniques", "Authors": [ "Dick Grune", "Ceriel J.H. Jacobs" ], "Date": "2007", "Publisher": "Springer" }

}

helsinki.fi

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