khibino/haskell-relational-record
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Kei Hibino 2014-12-25 10:23:17 +09:00
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doc/slide/tsukuba-201412/DSL.html
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@ -252,6 +252,13 @@ birthdayHeiseiDesc <span class="fu">=</span> aggregateRelation <span class="fu"
orderBy personCount <span class="dt">Desc</span>
return <span class="fu">$</span> gbd <span class="fu">&gt;&lt;</span> personCount</code></pre>
<p>orders by the number of people born on the same Heisei period dates:</p>
<pre class="sourceCode sql"><code class="sourceCode sql"><span class="kw">SELECT</span> <span class="kw">ALL</span> T1.day <span class="kw">AS</span> f0, <span class="fu">COUNT</span> (T0.name) <span class="kw">AS</span> f1
<span class="kw">FROM</span> PUBLIC.person T0 <span class="kw">INNER</span> <span class="kw">JOIN</span> PUBLIC.birthday T1
<span class="kw">ON</span> (T0.name = T1.name)
<span class="kw">WHERE</span> (T1.day &gt;= <span class="dt">DATE</span> <span class="st">'1989-01-08'</span>)
<span class="kw">GROUP</span> <span class="kw">BY</span> T1.day <span class="kw">ORDER</span> <span class="kw">BY</span> <span class="fu">COUNT</span> (T0.name) <span class="kw">DESC</span></code></pre>
</div><div id="ordering-example-2" class="slide section level2">
<h1>Ordering Example</h1>
<pre class="sourceCode sql"><code class="sourceCode sql"><span class="kw">SELECT</span> <span class="kw">ALL</span> T1.day <span class="kw">AS</span> f0, <span class="fu">COUNT</span> (T0.name) <span class="kw">AS</span> f1
<span class="kw">FROM</span> PUBLIC.person T0 <span class="kw">INNER</span> <span class="kw">JOIN</span> PUBLIC.birthday T1
<span class="kw">ON</span> (T0.name = T1.name)
@ -334,6 +341,13 @@ personAndBirthdayP2 <span class="fu">=</span> relation' <span class="fu">$</spa
<span class="ot">=&gt;</span> (a <span class="ot">-&gt;</span> b) <span class="ot">-&gt;</span> <span class="dt">Placeholders</span> a <span class="ot">-&gt;</span> <span class="dt">Placeholders</span> b
<span class="ot">(|*|) ::</span> <span class="dt">Placeholders</span> (a <span class="ot">-&gt;</span> b) <span class="ot">-&gt;</span> <span class="dt">Placeholders</span> a <span class="ot">-&gt;</span> <span class="dt">Placeholders</span> b</code></pre>
<p>Generated SQL:</p>
<pre class="sourceCode sql"><code class="sourceCode sql"><span class="kw">SELECT</span> <span class="kw">ALL</span> T0.name <span class="kw">AS</span> f0, T0.age <span class="kw">AS</span> f1, T0.address <span class="kw">AS</span> f2,
T1.name <span class="kw">AS</span> f3, T1.day <span class="kw">AS</span> f4
<span class="kw">FROM</span> PUBLIC.person T0 <span class="kw">INNER</span> <span class="kw">JOIN</span> PUBLIC.birthday T1
<span class="kw">ON</span> (((T0.name = ?) <span class="kw">AND</span> (T0.age = ?)) <span class="kw">AND</span> (T0.address = ?))</code></pre>
</div><div id="record-mapping---placeholders-1" class="slide section level2">
<h1>Record Mapping - Placeholders</h1>
<p>Generated SQL:</p>
<pre class="sourceCode sql"><code class="sourceCode sql"><span class="kw">SELECT</span> <span class="kw">ALL</span> T0.name <span class="kw">AS</span> f0, T0.age <span class="kw">AS</span> f1, T0.address <span class="kw">AS</span> f2,
T1.name <span class="kw">AS</span> f3, T1.day <span class="kw">AS</span> f4
<span class="kw">FROM</span> PUBLIC.person T0 <span class="kw">INNER</span> <span class="kw">JOIN</span> PUBLIC.birthday T1