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    <p>Quoting the <a href="http://code.google.com/appengine/docs/java/datastore/usingjpa.html#Class_and_Field_Annotations" rel="nofollow noreferrer">Class and Field Annotations</a> section from <a href="http://code.google.com/appengine/docs/java/datastore/usingjpa.html" rel="nofollow noreferrer">Using JPA with App Engine</a>:</p> <blockquote> <p>Fields of the data class that are to be stored in the datastore must either be of a type that is persisted by default or expliclty declared as persistent. You can find a chart detailing JPA default persistence behavior on <a href="http://www.datanucleus.org/products/accessplatform_1_1/jpa/types.html" rel="nofollow noreferrer">the DataNucleus website</a>. To explicitly declare a field as persistent, you give it an <code>@Basic</code> annotation:</p> <pre><code>import java.util.Date; import javax.persistence.Enumerated; import com.google.appengine.api.datastore.ShortBlob; // ... @Basic private ShortBlob data; </code></pre> <p>The type of a field can be any of the following:</p> <ul> <li>one of the <a href="http://code.google.com/appengine/docs/java/datastore/dataclasses.html#Core_Value_Types" rel="nofollow noreferrer">core types</a> supported by the datastore</li> <li>a Collection (such as a <code>java.util.List&lt;...&gt;</code>) of values of a core datastore type</li> <li>an instance or Collection of instances of a <code>@Entity</code> class</li> <li>an embedded class, stored as properties on the entity</li> </ul> </blockquote> <p>To define and use <code>Email</code> and <code>PhoneNumber</code> as data types, create entities for them and map them as <a href="http://www.datanucleus.org/products/accessplatform_1_1/jpa/annotations.html#OneToOne" rel="nofollow noreferrer"><code>@OneToOne</code></a> or make them <a href="http://www.datanucleus.org/products/accessplatform_1_1/jpa/annotations.html#Embeddable" rel="nofollow noreferrer"><code>@Embeddable</code></a>.</p>
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    1. POWhat datatypes are supported by Google App Engine's datastore?
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    1. USPascal Thivent
    1. USPascal Thivent
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    1. COHow to define and use email and phone number data type in big table
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    2. COdo you know if there is a limit to the size() of the Collection?
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