Relational data as_xml

Efficiently Publishing Relational Data as XML Documents Authors:- J Shanmugasundaram, Michael Carey etc (IBM Almaden Research Center) Presented By Harshavardhan Achrekar (University of Massachusetts-Lowell)

What drove them? ,[object Object],[object Object]

Primary Issues ,[object Object],[object Object],[object Object],[object Object]

RoadMap ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Sample XML Document for Customer <customer id=”C1”> <name> John Doe </name> <accounts> <account id=”A1”> 1894654 </account> <account id=”A2”> 3849342 </account> </accounts> <porders> <porder id=”PO1” acct=”A1”> // first purchase order <date>1 Jan 2000</date> <items> <item id=”I1”> Shoes </item> <item id=”I2”> Bungee Ropes </item> </items> <payments> <payment id=”P1”> due Jan 15 </payment> <payment id=”P2”> due Jan 20 </payment> <payment id=”P3”> due feb 15 </payment> </payments> </porder> <porder id=”PO2” acct=”A2”> // second purchase order … </porder> </porders> </customer> ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Underlying tables Customer ( id int, name varchar) Account ( id varchar, custID int, acctnum int) Item ( id int, poID int, desc varchar) PurchOrder ( id int, custID int, acctID varchar, date varchar) Payment ( id int, poID int, desc varchar)

SQL-based language specifications ,[object Object],[object Object],[object Object],[object Object],[object Object]

Customer Definition of XML Constructor ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Input Output Output - A Customer XML Element Aggregate function XMLAGG – Concatenates XML Fragments produced by XML Constructor

Sample SQL query constructs XML from relational tables ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Correlated sub-query for customer’s Accounts Correlated sub-query For purchase orders Top Level query returns each customer from customer table Correlated sub-query returns XML fragment LINES 1-14 produces Scalar function returning Customer XML

Implementation Alternatives ,[object Object],[object Object],[object Object],[object Object],Late Tagging Early Tagging Late Structuring Early Structuring Inside Engine Inside Engine Inside Engine Outside Engine Outside Engine Outside Engine Stored Procedures CLOB

Early tagging and structuring ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Early tagging and structuring ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Efficiently Publishing Relational Data as XML Documents

Relational data as_xml

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