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<td style="vertical-align: top;; padding: 0; border-collapse: collapse; padding-right: 5px; font-size: 20px; line-height: 30px; mso-line-height-rule: exactly" class="page-title-pattern-header-container"> <span class="page-title-pattern-header" style="font-family: Arial, sans-serif; padding: 0; font-size: 20px; line-height: 30px; mso-text-raise: 2px; mso-line-height-rule: exactly; vertical-align: middle"> <a href="https://hibernate.atlassian.net/browse/HHH-11391" style="color: #3b73af; text-decoration: none">Re: Improved metadata about a basic-typed value</a> </span> </td>
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<p style="margin: 10px 0 0; margin-top: 0">Quick background.. JavaTypeDescriptor describes the Java type; SqlTypeDescriptor describes the database type. An ORM Type defines the coordination between the two. These ORM Types generally describe the Java type of a persistent attribute (singular or plural) as well as the index/map-key and element/map-value. ORM Type is broadly categorized by:</p>
<ol>
<li>ManagedType
<ol>
<li>EmbeddableType</li>
<li>IdentifiableType</li>
<li>EntityType</li>
</ol> </li>
<li>BasicType</li>
<li>CollectionType</li>
</ol>
<p style="margin: 10px 0 0">ManagedTypes and CollectionTypes are the same in that their interesting details and capabilities are kept on a separate group of contracts called "persisters" which they resolve as needed via the <tt>TypeConfiguration</tt> and expose to the Type holder. BasicTypes generally handle their interesting pieces themselves.</p>
</blockquote> <p style="margin: 10px 0 0">Actually this might have to make it into Alpha1 as it gets to the heart of the new Type design especially as concerns resolution of a BasicType in the ORM Type sense (<tt>org.hibernate.type.spi.BasicType</tt>). The underlying design here is moving BasicType to more of a composition design rather than subclassing. Specifically a BasicType is made up of:</p>
<ol>
<li>JavaTypeDescriptor</li>
<li>SqlTypeDescriptor</li>
<li>MutabilityPlan</li>
<li>Comparator</li>
<li>javax.persistence.TemporalType (called "temporal precision") for ORM TemporalTypes</li>
</ol> <p style="margin: 10px 0 0">Specifying the individual components listed above via various mapping constructs - the end "accumulation" of those being a <tt>org.hibernate.type.spi.BasicTypeParameters</tt> reference to pass to <tt>org.hibernate.type.spi.BasicTypeRegistry#resolveBasicType</tt> which is how BasicTypes are resolved and cached during bootstrap based on a "registry key" which BasicType now exposes as well: <tt>BasicType#getRegistryKey</tt>. <tt>BasicTypeParameters</tt> exposes this common information regardless of the mapping source (singular attribute, collection element, etc) for resolution.</p> <p style="margin: 10px 0 0">In terms of how that affects user migrating, it will effect them if they either:</p>
<ol>
<li>implement custom type via Type, BasicType, UserType or CompositeUserType - I think the ideal option here is to ask the implementors to make some minor changes in their implementation. The changes are pretty straight forward and referenced in the migration guide.</li>
<li>use Type - generally this happens in relation to setting Query parameters. And getting ahold of one was not perfect the idea here is to maybe to continue to</li>
</ol> <p style="margin: 10px 0 0">The question above wrt continuing to support naming BasicTypes by name, I more just mean that I think we should shift the meaning of that to interpret the historical "type name" mapping metadata in terms of the correlated JavaTypeDescriptor/SqlTypeDescriptor combo. For example Hibernate would always interpret numerous variations on the old basic type registry's key for "String" to mean the JavaTypeDescriptor(String)/SqlTypeDescriptor(VARCHAR). So we do that still, but in this new composition way.</p> <p style="margin: 10px 0 0">For the cases where users specified Type class names, e.g. <tt>org.hibernate.type.StringType</tt>, (by class name) we could handle cases where the class names were our legacy names by using the new composition.</p> <p style="margin: 10px 0 0">For other . you can specify the Type class name... we'd have to decide </p>
<ul>
<li>
<ul>
<li>I wonder too if we should keep <tt>org.hibernate.type.BasicType</tt> as well somehow as it is by far the most used and implemented of the Types we are removing (having it subclass the new <tt>org.hibernate.type.spi.BasicType</tt> interface and delegating method calls as needed via default impls).</li>
</ul> </li>
</ul> <p style="margin: 10px 0 0">The question above wrt continuing <br> I question whether we should continue to support <br> The least obvious is how to allow metadata to indicate the JavaTypeDescriptor to use. One option is to Another option specifically g</p> </td>
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