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From conflue...@apache.org
Subject [CONF] Apache Cayenne Documentation: EJBQLQuery (page edited)
Date Fri, 22 Jun 2007 08:13:00 GMT
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/* permissions page styles */
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/******* Edit Page Styles *******/
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/******* Left Navigation Theme Styles ********/
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/* Added by Shaun during i18n */
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.topPadding
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/* new form style */
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    -->
    </style>
</head>
<body>

<div id="PageContent">
<table class="pagecontent" border="0" cellpadding="0" cellspacing="0" width="100%"><tr>
<td valign="top" class="pagebody">

    <div class="pageheader">
        <span class="pagetitle">
            Page Edited :
            <a href="http://cwiki.apache.org/confluence/display/CAYDOC">CAYDOC</a>
:
            <a href="http://cwiki.apache.org/confluence/display/CAYDOC/EJBQLQuery">EJBQLQuery</a>
        </span>
    </div>

     <p>
        <a href="http://cwiki.apache.org/confluence/display/CAYDOC/EJBQLQuery">EJBQLQuery</a>
        has been edited by             <a href="http://cwiki.apache.org/confluence/display/~andrus">Andrus
Adamchik</a>
            <span class="smallfont">(Jun 22, 2007)</span>.
     </p>
    
     <p>
                 <a href="http://cwiki.apache.org/confluence/pages/diffpagesbyversion.action?pageId=57143&originalVersion=7&revisedVersion=8">(View
changes)</a>
     </p>

    <span class="label">Content:</span><br/>
    <div class="greybox wiki-content"><p><em>(available since 3.0 in both
classic and JPA modes; as of June 2007 only a subset of EJBQL syntax is supported)</em></p>

<p>EJBQL is an object query language that is not unlike SQL, only it operates in terms
of the Java object model. In fact "EJB" in its name is entirely misleading - the language
is applicable in the non-"enterprise" environments just as well. Standard EJBQL syntax is
specified in the <a href="/confluence/display/CAYDOC/JPA+Guide" title="JPA Guide">JPA
specification</a>, still Cayenne supports it in a classic mode, and no JPA runtime is
required to execute such queries. This chapter deals specifically with classic mode operation.
</p>

<h3><a name="EJBQLQuery-EJBQLSyntax"></a>EJBQL Syntax</h3>

<p>Details of the syntax are available in various JPA literature. Here is an example
of an EJBQL query:</p>

<div class="code"><div class="codeContent">
<pre class="code-java">select p from Painting p WHERE p.estimatedPrice &gt; 3000</pre>
</div></div>

<p>Visually it looks like SQL, only instead of tables, object entities are used; and
instead of columns and joins, path expressions are used (not unlike Cayenne <a href="/confluence/display/CAYDOC/Path+Expressions"
title="Path Expressions">path expressions</a>).</p>

<p><em>(TODO: would be nice to fill in more examples)</em></p>

<h3><a name="EJBQLQuery-CreatinganEJBQLQuery"></a>Creating an EJBQLQuery</h3>

<p>Creating an EJBQLQuery is simple - just pass a valid EJBQL string to the constructor:</p>

<div class="code"><div class="codeContent">
<pre class="code-java">EJBQLQuery query = <span class="code-keyword">new</span>
EJBQLQuery(<span class="code-quote">"select a FROM Artist a"</span>);</pre>
</div></div> 

<p>Further you can use the query object the same way as any other Cayenne query to select
objects or to modify the database.</p>

<table cellpadding='5' width='85%' cellspacing='8px' class='noteMacro' border="0" align='center'><colgroup><col
width='24'><col></colgroup><tr><td valign='top'><img src="/confluence/images/icons/emoticons/warning.gif"
width="16" height="16" align="absmiddle" alt="" border="0"></td><td>As of June
2007, only selecting EJBQL syntax is supported; there are various other limitations</td></tr></table>

<p>Select objects:</p>

<div class="code"><div class="codeContent">
<pre class="code-java">List artists = context.performQuery(query);</pre>
</div></div>


<h3><a name="EJBQLQuery-EJBQLQueryvs.SelectQuery"></a>EJBQLQuery vs. SelectQuery</h3>

<p><em>TODO: general comparison</em> </p>


<p>Aside from noted different capabilities, EJBQLQuery and SelectQuery differ in some
areas where they provide similar functionality. These differences are caused by the need for
EJBQL syntax to follow the official specification, so it can't work "the Cayenne way":</p>

<ul>
	<li><b>Null Handling</b>: SelectQuery <a href="/confluence/display/CAYDOC/NULL+Handling"
title="NULL Handling">would translate</a> the expressions matching NULL values to
the corresponding "X IS NULL" or "X IS NOT NULL" SQL syntax. EJBQLQuery on the other hand
requires explicit "IS NULL" (or "IS NOT NULL") syntax to be used, otherwise the generated
SQL will look like "X = NULL" (or "X &lt;&gt; NULL"), which will evaluate differently.</li>
</ul>


<ul>
	<li><b>Expression Parameters</b>: SelectQuery <a href="/confluence/display/CAYDOC/Building+Expressions"
title="Building Expressions">uses "$"</a> to denote named parameters (e.g. "$myParam"),
while EJBQL uses ":" (e.g. ":myParam"). Also EJBQL supports positional parameters denoted
by the question mark: "?3".</li>
</ul>



<h3><a name="EJBQLQuery-EJBQLQueryvs.SQLTemplate"></a>EJBQLQuery vs. SQLTemplate</h3>

<p><em>TODO: general comparison</em> </p>

<ul>
	<li><b>Null Handling</b>:</li>
</ul>
</div>


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