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Is there a Hibernate dialect for Oracle Database 18c? Or should I use the org.hibernate.dialect.Oracle12cDialect that ships with Hibernate?
When using Hibernate 5.3 and Oracle 18c RAC is there anything special the application has to take care of?
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Dialect allows Hibernate to generate SQL optimized for a particular relational database. Hibernate generates queries for the specific database based on the Dialect class. A hibernate dialect gives information to the framework of how to convert hibernate queries(HQL) into native SQL queries.
To upgrade to Oracle 19c, you will need to upgrade Hibernate to version 5.4+ beforehand.
As you can see, code remains the same for different databases. So to use Hibernate with Oracle database, you need to use proper JDBC driver, connection properties and create sequence.
SQL Dialects in Hibernate For connecting any hibernate application with the database, it is required to provide the configuration of SQL dialect.
At the time of writing this comment with the latest version of Hibernate (5.4.10), there is no official dialect for Oracle18 in Hibernate.
When there are no major differences in the Database dialect, a special dialect is not usually created for him in Hibernate.
For example, I used the Oracle10 dialect with Oracle11 without major problems in production environments. The same for Oracle 18, the Oracle12 dialect should work without major problems.
Keep in mind that Oracle release numbers are no longer numbered as in the past, and today they are related to the release year (so the larger number does not mean exactly that there are major changes in your dialect).
About Oracle Database release numbers: release number
As a comment, if you don't use the new features of Oracle 18, there is also the possibility of configuring Oracle to be compatible with a certain previous version (11 or 12 in this case). However, it is recommend not to use this config if it's possible solved with a custom Dialect or modifying your software.
About Oracle Database Compatible parameter: compatible parameter
I hope this helps others who are looking for the same.
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