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= 6.3 Migration Guide
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:toc:
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:toclevels: 4
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:docsBase: https://docs.jboss.org/hibernate/orm
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:versionDocBase: {docsBase}/6.3
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:userGuideBase: {versionDocBase}/userguide/html_single/Hibernate_User_Guide.html
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:javadocsBase: {versionDocBase}/javadocs
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This guide discusses migration to Hibernate ORM version 6.3. For migration from
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earlier versions, see any other pertinent migration guides as well.
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* link:{docsBase}/6.2/migration-guide/migration-guide.html[6.2 Migration guide]
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* link:{docsBase}/6.1/migration-guide/migration-guide.html[6.1 Migration guide]
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* link:{docsBase}/6.0/migration-guide/migration-guide.html[6.0 Migration guide]
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2023-03-17 05:08:20 -04:00
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[[ddl-changes]]
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== DDL type changes
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[[ddl-offset-time]]
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=== OffsetTime mapping changes
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`OffsetTime` now depends on `@TimeZoneStorage` and the `hibernate.timezone.default_storage` setting.
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Since the default for this setting is now `TimeZoneStorageType.DEFAULT`, this means that the DDL expectations for such columns changed.
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If the target database supports time zone types natively like H2, Oracle, SQL Server and DB2 z/OS,
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the type code `SqlTypes.TIME_WITH_TIMEZONE` is now used, which maps to the DDL type `time with time zone`.
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Due to this change, schema validation errors could occur on existing databases.
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The migration to `time with time zone` requires a migration expression like `cast(old as time with time zone)`
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which will interpret the previous time as local time and compute the offset for the `time with time zone` based on the current date
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and time zone settings of your database session.
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If the target database does not support time zone types natively, Hibernate behaves just like before.
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To retain backwards compatibility, configure the setting `hibernate.timezone.default_storage` to `NORMALIZE`.
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