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<td class="page-title-pattern-first-line " style="padding: 0; border-collapse: collapse; font-family: Arial, sans-serif; font-size: 14px; padding-top: 10px"> <a href="https://hibernate.atlassian.net/browse/HHH" style="color: #3b73af; text-decoration: none">Hibernate ORM</a> / <a href="https://hibernate.atlassian.net/browse/HHH-11391" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-6dad101b-c7e9-495a-a0a8-0b0969d56ab7" height="16" width="16" border="0" align="absmiddle" alt="Improvement" style="vertical-align: text-bottom"></a> <a href="https://hibernate.atlassian.net/browse/HHH-11391" style="color: #3b73af; text-decoration: none">HHH-11391</a> </td>
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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">Improved metadata about a basic-typed value</a> </span> </td>
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<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <a class="user-hover" rel="steve" id="email_steve" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=steve" style="color:#6c797f;; color: #3b73af; text-decoration: none">Steve Ebersole</a> </td>
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<th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Comment:</th>
<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <span class="diffremovedchars" style="background-color:#ffe7e7;text-decoration:line-through;">{quote}<br>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:<br><br># ManagedType<br>## EmbeddableType<br>## IdentifiableType<br>## EntityType<br># BasicType<br># CollectionType<br><br>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 {{TypeConfiguration}} and expose to the Type holder. BasicTypes generally handle their interesting pieces themselves.<br>{quote}<br><br>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 ({{org.hibernate.type.spi.BasicType}}). The underlying design here is moving BasicType to more of a composition design rather than subclassing. Specifically a BasicType is made up of:<br># JavaTypeDescriptor<br># SqlTypeDescriptor<br># MutabilityPlan<br># Comparator<br># javax.persistence.TemporalType (called "temporal precision") for ORM TemporalTypes<br><br>Specifying the individual components listed above via various mapping constructs - the end "accumulation" of those being a {{org.hibernate.type.spi.BasicTypeParameters}} reference to pass to {{org.hibernate.type.spi.BasicTypeRegistry#resolveBasicType}} which is how BasicTypes are resolved and cached during bootstrap based on a "registry key" which BasicType now exposes as well: {{BasicType#getRegistryKey}}. {{BasicTypeParameters}} exposes this common information regardless of the mapping source (singular attribute, collection element, etc) for resolution.<br><br>In terms of how that affects user migrating, it will effect them if they either:<br># 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.<br># 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 <br><br><br>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.<br><br>For the cases where users specified Type class names, e.g. {{org.hibernate.type.StringType}}, (by class name) we could handle cases where the class names were our legacy names by using the new composition.<br><br>For other . you can specify the Type class name... we'd have to decide <br><br><br>** I wonder too if we should keep {{org.hibernate.type.BasicType}} as well somehow as it is by far the most used and implemented of the Types we are removing (having it subclass the new {{org.hibernate.type.spi.BasicType}} interface and delegating method calls as needed via default impls).<br><br><br><br>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<br></span> </td>
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