278 lines
8.2 KiB
HTML
278 lines
8.2 KiB
HTML
<!doctype html>
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<html lang="en">
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<head>
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<meta charset="utf-8">
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<title>CSE 4/562</title>
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<meta name="description" content="CSE 4/562">
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<meta name="author" content="Oliver Kennedy">
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<meta name="apple-mobile-web-app-capable" content="yes" />
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<meta name="apple-mobile-web-app-status-bar-style" content="black-translucent" />
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<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no, minimal-ui">
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<link rel="stylesheet" href="../reveal.js-3.6.0/css/reveal.css">
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<link rel="stylesheet" href="ubodin.css" id="theme">
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<!-- Code syntax highlighting -->
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<link rel="stylesheet" href="../reveal.js-3.6.0/lib/css/zenburn.css">
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<!-- Printing and PDF exports -->
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<script>
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var link = document.createElement( 'link' );
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link.rel = 'stylesheet';
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link.type = 'text/css';
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link.href = window.location.search.match( /print-pdf/gi ) ? '../reveal.js-3.6.0/css/print/pdf.css' : '../reveal.js-3.6.0/css/print/paper.css';
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document.getElementsByTagName( 'head' )[0].appendChild( link );
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</script>
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<!--[if lt IE 9]>
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<script src="../reveal.js-3.6.0/lib/js/html5shiv.js"></script>
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<![endif]-->
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</head>
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<body>
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<div class="reveal">
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<!-- Any section element inside of this container is displayed as a slide -->
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<div class="header">
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<!-- Any Talk-Specific Header Content Goes Here -->
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CSE 4/562 - Database Systems
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</div>
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<div class="footer">
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<!-- Any Talk-Specific Footer Content Goes Here -->
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<div style="float: left; margin-top: 15px; ">
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Exploring <u><b>O</b></u>nline <u><b>D</b></u>ata <u><b>In</b></u>teractions
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</div>
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<img src="graphics/LabLogo-FullText-white.png" height="40" style="float: right;"/>
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</div>
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<div class="slides">
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<section>
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<section>
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<h1>Intro</h1>
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<h3>CSE 4/562 – Database Systems</h3>
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<h5>February 01, 2019</h5>
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</section>
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<section>
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<ul>
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<li>Using CCJSQLParser</li>
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<li>Using SQL ASTs</li>
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<li>Select Statements</li>
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<li>Create Table Statements</li>
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</ul>
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</section>
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</section>
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<section>
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<section>
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<h2>Using CCJSqlParser</h2>
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<pre><code class="java">
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// StringReaders create a reader from a string
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Reader input = new StringReader("SELECT * FROM R")
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// CCJSqlParser takes a Reader or InputStream
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CCJSqlParser parser = new CCJSqlParser(input)
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// CCJSqlParser.Statement() returns the next
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// complete Statement object from the reader or
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// input stream (or null if the stream is empty).
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Statement statement = parser.Statement()
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</code></pre>
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</section>
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<section>
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<h2>Using CCJSqlParser</h2>
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<pre><code class="java">
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// System.in is an InputStream
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CCJSqlParser parser = new CCJSqlParser(System.in)
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Statement statement = parser.Statement();
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// loop until you hit the last statement
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while(statement != null){
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//
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// Do something with statement
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//
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// ... then read the next statement
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statement = parser.Statement();
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}
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</code></pre>
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</section>
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</section>
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<section>
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<section>
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<h2>Abstract Syntax Trees</h2>
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<ul>
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<li><b>Statement</b>: Select, CreateTable</li>
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<li class="fragment" data-fragment-index="1"><b>SelectBody</b>: PlainSelect, Union</li>
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<li class="fragment" data-fragment-index="1"><b>FromItem</b>: Table, Join, SubSelect</li>
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<li class="fragment" data-fragment-index="1"><b>SelectItem</b>: AllColumns, AllTableColumns, SelectExpressionItem</li>
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<li class="fragment" data-fragment-index="1"><b>Expression</b>: LongValue, AddExpression, GreaterThan</li>
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</ul>
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</section>
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<section>
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<pre><code class="java">
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while(statement != null){
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if(statement instanceof Select){
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Select select = (Select)statement;
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// Do something with `select`
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} else if(statement instanceof CreateTable){
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CreateTable create = (CreateTable)statement;
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// Do something with `create`
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} else {
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throw new SqlException("Can't handle: "+statement);
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}
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statement = parser.Statement()
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}
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</code></pre>
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</section>
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<section>
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<pre><code class="java">
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Select select = (Select)statement;
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SelectBody body = select.getSelectBody();
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if(body instanceof /* ... */){
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// ...
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}
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</code></pre>
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<ul class="fragment">
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<li><b>PlainSelect</b>: <tt>(SELECT * FROM ...)</tt></li>
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<li><b>Union</b>: <tt>(SELECT * FROM ...) UNION ALL (SELECT ...)</tt></li>
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</ul>
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</section>
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<section>
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<pre><code class="java">
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Select select = (Select)statement;
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SelectBody body = select.getSelectBody();
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if(body instanceof PlainSelect){
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PlainSelect plain = (PlainSelect)body;
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// Do something with `plain`
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}
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</code></pre>
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</section>
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</section>
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<section>
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<section>
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<h2>PlainSelect</h2>
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<pre><code class="sql">
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SELECT [distinct] [selectItems]
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FROM [fromItem], [joins, ...]
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WHERE [where]
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GROUP BY [groupByColumnReferences]
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HAVING [having]
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ORDER BY [orderByElements]
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LIMIT [limit]
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</code></pre>
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Everything in [brackets] has a method in <a href="http://doc.odin.cse.buffalo.edu/jsqlparser/net/sf/jsqlparser/statement/select/PlainSelect.html">PlainSelect</a>
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</section>
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<section>
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<h2>SelectItems</h2>
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<dl>
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<dt>AllColumns</dt>
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<dd>SELECT *</dd>
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<dt>AllTableColumns</dt>
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<dd>SELECT R.*</dd>
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<dt>SelectExpressionItem</dt>
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<dd>SELECT R.A or SELECT R.A AS Q</dd>
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</dl>
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</section>
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<section>
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<h2>Expressions</h2>
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<ul>
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<li>WHERE</li>
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<li>HAVING</li>
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<li>SelectExpressionItem</li>
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<li>ORDER BY</li>
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</ul>
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(To be discussed next week)
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</section>
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</section>
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</div></div>
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<script src="../reveal.js-3.6.0/lib/js/head.min.js"></script>
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<script src="../reveal.js-3.6.0/js/reveal.js"></script>
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<script>
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// Full list of configuration options available at:
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// https://github.com/hakimel/../reveal.js#configuration
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Reveal.initialize({
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history: true,
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center: true,
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transition: 'fade', // none/fade/slide/convex/concave/zoom
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chart: {
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defaults: {
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global: {
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title: { fontColor: "#333", fontSize: 24 },
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{ src: '../reveal.js-3.6.0/plugin/markdown/marked.js', condition: function() { return !!document.querySelector( '[data-markdown]' ); } },
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</html>
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