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HHH-17557 update migration guide

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Gavin King 2024-09-15 08:52:39 +02:00
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migration-guide.adoc
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@ -261,13 +261,22 @@ Hibernate previously added support for generating check constraints for enums ma
as part of schema generation. 7.0 adds the same capability for enums mapped using an `AttributeConverter`, as part of schema generation. 7.0 adds the same capability for enums mapped using an `AttributeConverter`,
by asking the converter to convert all the enum constants on start up. by asking the converter to convert all the enum constants on start up.
[[datetime-native]]
== Date and time types returned by native queries
In the absence of a `@SqlResultSetMapping`, previous versions of Hibernate used `java.sql` types (`Date`, `Time`, `Timestamp`) to represent date/time types returned by a native query.
In 7.0, such queries return types defined by `java.time` (`LocalDate`, `LocalTime`, `LocalDateTime`) by default.
The previous behavior may be recovered by setting `hibernate.query.native.prefer_jdbc_datetime_types` to `true`.
[[ddl-implicit-datatype-timestamp]] [[ddl-implicit-datatype-timestamp]]
== Default precision for timestamp on some databases == Default precision for `timestamp` on some databases
The default precision for Oracle timestamps was changed to 9 i.e. nanosecond precision. The default precision for Oracle timestamps was changed to 9 i.e. nanosecond precision.
The default precision for SQL Server timestamps was changed to 7 i.e. 100 nanosecond precision. The default precision for SQL Server timestamps was changed to 7 i.e. 100 nanosecond precision.
Note that these changes only affect DDL generation.
[[sf-name]] [[sf-name]]
== SessionFactory Name (and JNDI) == SessionFactory Name (and JNDI)