Not your Grandma's XQuery
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The document summarizes a presentation on how XQuery has evolved beyond its original implementation and capabilities. It discusses key features of modern XQuery implementations including automatic scaling, full-text search capabilities, data definition facilities for collections and indexes, scripting support for side effects, and use of XQuery in the browser without plugins. It provides examples of these extended features such as indexing, full-text search, scripting for web applications, and integrating XQuery with JavaScript in the browser.
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Not your Grandma's XQuery
- 1. 28 msec Not Your Grandma’s XQuery Key Features & Perspectives William Candillon {candillon@28msec.com} XML Amsterdam 2011
- 2. “What I saw in your five-minutes talk hardly looks at all like the XQuery I saw back then.” - Daniel Weinred, Google
- 3. Not Your Grandma’s XQuery
- 8. • ........
- 22. Application Stack Client JavaScript Middleware Java Content Lucene Management Database MySQL
- 23. Application Stack Client JavaScript Middleware Java Content XQuery Lucene Management Database MySQL
- 24. Application Stack Client in the Browser Middleware Scripting Content XQuery Full-Text Management Data Definition Database Facility
- 25. XQuery Data Definition Facility • Open Specification (http://goo.gl/XzK8p) • Implemented by Zorba (http://goo.gl/4huso) • Extending XQuery with - Collections - Indexes - Integrity Contraints
- 26. declare collection f:forecasts as element(forecast);
- 27. declare %automatic %value-equality %non-unique index f:forecasts-index on nodes cdml:collection(xs:QName("f:forecasts")) by @site-id as xs:string;
- 28. Index Properties declare %automatic %value-equality %non-unique index f:forecasts-index on nodes cdml:collection(xs:QName("f:forecasts")) by @site-id as xs:string;
- 29. Index Name declare %automatic %value-equality %non-unique index f:forecasts-index on nodes cdml:collection(xs:QName("f:forecasts")) by @site-id as xs:string;
- 30. declare %automatic %value-equality %non-unique index f:forecasts-index on nodes cdml:collection(xs:QName("f:forecasts")) by @site-id as xs:string; Domain Expression
- 31. declare %automatic %value-equality %non-unique index f:forecasts-index on nodes cdml:collection(xs:QName("f:forecasts")) by @site-id as xs:string; Index Key
- 32. declare %automatic %value-equality %non-unique index f:forecasts-index on nodes cdml:collection(xs:QName("f:forecasts")) by @site-id as xs:string, @city as xs:string;
- 33. declare %automatic %value-range index f:forecasts-index on nodes cdml:collection(xs:QName("f:forecasts")) by @temperature as xs:decimal;
- 35. $ sausalito backup data Backup data for project at: /Users/test/forecast Project URI: http://www.example.com/ Starting backup for collection data ... OK Backup successful $ sausalito restore data -f forecast.tar.gz Restored data
- 36. Full-Text • XQuery and XPath Full Text 1.0 • Thesaurus • Stemming • Complete access to the full text internals ft:tokenize($node, $lang) ft:tokenizer-properties() ft:thesaurus-lookup($uri, $phrase) ft:stem($work) ...
- 37. $data//element()[. contains text {$search-term}]
- 38. let $x := <msg>breakfast of champions</msg> return $x contains text "meal" using thesaurus at "http://wordnet.princeton.edu" relationship "narrower term"
- 40. let $doc := doc(“doc.xml”) for $token in ft:tokenize($doc) return concat($token/@value, “ at ”, $token/@paragraph, $token/@sentence )
- 41. Scripting • Open Specification • Implemented by Zorba • Friendly syntax for imperative programming • Semantic for side-effects • Specification at http://goo.gl/kTYuf • Tutorial at http://goo.gl/F23je
- 42. let $handler := function($request){ let $world := $request/http:body/text() return <h1>Hello {$world}!</h1> } return mongoose:start($handler, 8080); mongoose:cin();
- 43. while(true()) { variable $request := server:listen("localhost", 8080); variable $response := api:process($request); api:serialize($response) };
- 44. if(count($result) lt count($collection)) then { http:set-header("x-truncated", "true"); http:set-header("x-next", "/api?start=7b5c28c0"); } else { http:set-header("x-truncated", "false"); }; $result
- 45. in the Browser • Open Source Project from ETH • http://xqib.org • XQuery in the browser without a plug-in • Processor compiled to JavaScript • DOM as the processor store
- 46. <script type=”application/xquery”> b:addEventListener(b:dom()//*:button, "onclick", function($ev, $obj){ b:alert(“Clicked”) } ); </script>
- 47. <script type="text/javascript"> foo = function (arg){ return 'the text was '+ arg; }; </script> <script type="application/xquery"> ! let $x := b:js-call('window.foo', “Foo”) ! return b:alert($x) </script>
- 49. declare variable $ui:easing := (0, 0.02, 0.08, 0.19, 0.33, 0.5, 0.67, 0.81, 0.92, 0.98, 1); declare sequential function ui:fade() { declare $con := b:dom()//*[@id = "entries"]; declare $opacity := b:getStyle($con, "opacity"); if($opacity lt 1) then ( b:setStyle($con, "opacity", $ui:easing[. gt $opacity][1]), b:timer(100, ui:fade#0) ) else b:setStyle($con, "opacity", 1) };
- 50. Client Server <script type="application/xquery"> declare sequential function declare sequential function guestbook:add( local:submit($loc, $evtObj) $author as xs:string, $entry as xs:string { ){ let $date := fn:current-dateTime() let $name := s:id("author")/data(@value) let $entry := <entry author="{$author}" let $text := s:id("text")/text() datetime="{$date}">{$text}</entry> return return guestbook:add($name, $text); xqddf:insert-nodes-last($entries, $entry); }; }; b:addEventListener(s:id("submit"), declare sequential function guestbook:list() { "onclick", <entries>{ local:submit#2); xqddf:collection($entries) }</entries>; guestbook:list(); }; </script>
- 51. Client Server <script type="application/xquery"> declare sequential function declare sequential function guestbook:add( local:submit($loc, $evtObj) $author as xs:string, $entry as xs:string { ){ let $date := fn:current-dateTime() let $name := s:id("author")/data(@value) let $entry := <entry author="{$author}" let $text := s:id("text")/text() datetime="{$date}">{$text}</entry> return return guestbook:add($name, $text); xqddf:insert-nodes-last($entries, $entry); }; }; b:addEventListener(s:id("submit"), declare sequential function guestbook:list(){ "onclick", <entries>{ local:submit#2); xqddf:collection($entries) }</entries>; guestbook:list(); }; </script> Seamless Invocations
- 52. Pubzone (2009) Model View Controler 4100 Lines of code 3100 1830 1210 900 450 Java XQuery
- 53. AWS Libraries Java XQuery 8589 Lines of code 2905 2309 1469 572 455 S3 SimpleDB SNS
- 54. AWS Libraries Java XQuery 13803 Lines of Codes Lines of code - 80% 2496 AWS
- 55. AWS Libraries PHP XQuery 6531 Lines of Codes Lines of code 2496 - 62% AWS
- 56. <html> <head> <script type='text/javascript'> function buy(e) { newElement = document.createElement("p"); elementText = document.createTextNode (e.target.getAttribute(id)); newElement.appendChild(elementText); var res = document.evaluate( "//div[@id='shoppingcart']", document, null, XPathResult.UNORDERED_NODE_SNAPSHOT_TYPE, HTML null); res.snapshotItem(0).appendChild("newElement");} </script> JavaScript </head> <body> <div>Shopping cart</div> <div id="shoppingcart"></div> <% XPath // Code establishing connection ResultSet results = statement.executeQuery ("SELECT * FROM PRODUCTS"); while (results.next()) { out.println("<div>"); Java String prodName = results.getString(1); out.println(prodName); out.println("<input type='button' value='Buy'"); out.println("id='"+prodName+"'"); SQL out.println("onclick='buy(event)'/>"). out.println("</div>"); } results.close(); // Code closing connection %> </body> </html>
- 57. <html xmlns="http://www.w3.org/1999/xhtml"> <head> <script type='application/xquery'> declare updating function local:buy($evt, $obj) { insert node <p>{$obj/@id}</p> as first into //div[@id="shoppingcart"] }; b:addEventListener(b:dom()//input, "onclick", xs:Qname("local:buy")); </script> </head> <body> <div>Shopping cart</div> <div id="shoppingcart">{ XQuery Everywhere for $p in doc("products.xml")//*:product return <div> {$p/*:name} <input type='button' value='Buy' id='{$p/*:name}'/> </div> }</div> </body> </html>
- 58. Wadler's theorem of language adoption “A programming language will be adopted if and only if it permits its users to do something that cannot be done in any other way.”
- 59. GO Mapping Mapping JavaScript Java SQL Glue Glue GO Seamless Invocations XQuery XQuery
- 60. GO Mapping JavaScript Local Java Store SQL Glue Sync Sync
- 61. GO Mapping JavaScript Local Java Store SQL Glue Sync Sync GO XQuery Local XQuery Store Seamless Synchronisation
- 62. Demo Offline XQuery App
- 63. XQuery in Mobile Apps • 2 XQuery Stores - DOM - HTML5 Local Storage • When Offline - Each update is applied to local store - Pending Update Lists are stored in the local store • When Online - PULs are aggregated and sent to the Cloud - PULs are applied to the Cloud
- 64. insert node attribute done { “true” } into xqddf:collection($todos)[@id = $id]
- 65. insert node attribute done { “true” } into xqddf:collection($todos)[@id = $id] 1. Apply PUL Store PUL Local Store TODOs <todo done=”true”/> <insert src=”...” PULs target=”...” />
- 66. insert node attribute done { “true” } into xqddf:collection($todos)[@id = $id] Local Store 2. Send PUL TODOs <todo done=”true”/> PULs
- 67. insert node attribute done { “true” } into xqddf:collection($todos)[@id = $id] Local Store 3. Apply PUL TODOS <todo done=”true”/> PULs
- 68. Operators on Updates • Aggregation • Integration (+ detecting conflicts) • Reconciliation of conflicts • Reduction • Inversion
- 69. Spacial Axis
- 70. Time Axis
- 71. avg( $tempA/future-or-current::* intersect $tempB/past-or-current::* ) Text Time 68° 70° 65° 69° 72° $tempA $tempB
- 73. 28 msec Thank you!