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<a name="EOEntity-class"></a>
<div class="header">
<p>
Next: <a href="EOAttribute-class.html#EOAttribute-class" accesskey="n" rel="next">EOAttribute class</a>, Previous: <a href="EOModel-class.html#EOModel-class" accesskey="p" rel="prev">EOModel class</a>, Up: <a href="Classes.html#Classes" accesskey="u" rel="up">Classes</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Index.html#Index" title="Index" rel="index">Index</a>]</p>
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<hr>
<a name="EOEntity-class-1"></a>
<h2 class="chapter">14 EOEntity class</h2>
<a name="index-class_002c-EOEntity"></a>

<a name="overview-1"></a>
<h3 class="section">14.1 overview</h3>
<p>An entity contains information pertaining to a table in a database
in the form of attributes and relationships.
</p>
<p>Additionally an entity contains:
</p><ol>
<li> An array of class properties
</li><li> An array of primary key attributes
</li><li> A class name
</li><li> An External name
</li></ol>

<a name="Class-properties"></a>
<h3 class="section">14.2 Class properties</h3>
<p>A class property of an entity can be either an attribute or a relationship.
typically class properties are the set of attributes or relationships 
which are user visible and need to be set or accessed by the user.
Primary and Foreign keys attributes are usually derived from other
attributes or generated automatically and so they are not typically
class properties.
</p>
<p>A class property will be available through Key Value Coding for access
and modification, in an instance of an Enterprise object.
</p>
<a name="Class-name"></a>
<h3 class="section">14.3 Class name</h3>
<p>an EOEntity&rsquo;s class name represents the name of the class which will be
instantiated when creating an Enterprise Object such as EOGenericRecord
or a custom object.
</p>
<a name="Primary-Key-Attributes"></a>
<h3 class="section">14.4 Primary Key Attributes</h3>
<p>Primary key attributes specify which attributes uniquely identify a row
in the table, they are typically generated automatically by GDL2.
They correspond directly to the relational database concept.
</p>
<a name="External-name"></a>
<h3 class="section">14.5 External name</h3>
<p>The external name represents the table name in the database server,
and in any SQL the adaptor might generate.
</p>



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