![]() The convertToEntityAttribute method is called by the JPA provider when fetching an entity from the database, via a find method or when executing a JPQL or Criteria API query. Note that the supplied monthDay parameter can be null, hence we need to apply the transformation only for non-null MonthDay Object references. Notice that the year is set to a pre-defined value since we are not interested in this temporal field. In our case, the convertToDatabaseColumn method transforms the MonthDay entity attribute to a which will be set in the payment_day DATE column. The convertToDatabaseColumn method takes a single parameter, which is the entity attribute and returns the value that needs to be set on the associated table column. The convertToDatabaseColumn method is called by the JPA provider prior to executing an INSERT or UPDATE statement. LocalDate localDate = date.toLocalDate() Return MonthDay convertToEntityAttribute( Implements AttributeConverter convertToDatabaseColumn( Public class MonthDayDateAttributeConverter In our case, we need to create the following MonthDayDateAttributeConverter class that implements the JPA AttributeConverter interface: If you don’t need to provide a custom JDBC binding and fetching logic, then the JPA AttributeConverter is a viable solution to define the mapping between a given Java Object type and a database column type. We can either use a Hibernate-specific custom Type or a JPA AttributeConverter to handle the mapping between the MonthDay Java type and the date column type. Without providing a custom mapper, Hibernate will use the SerializableType for the paymentDay entity attribute and persist it as a byte array column type, which will not work for us since the payment_day column type is date. However, by default, Hibernate doesn’t support this Java type, so we need to provide a custom mapper. The paymentDay entity attribute type is MonthDay. For more details about using the FLuent-style API with JPA and Hibernate, check out this article. The AnnualSubscription entity uses the Fluent-style API, which as you will soon see, it greatly simplifies the way we can build a JPA entity. Public AnnualSubscription setPriceInCents( ![]() Public class AnnualSubscription Long = "price_in_cents"ĬolumnDefinition = MonthDayDateAttributeConverter.class The annual_subscription table is mapped to the following AnnualSubscription JPA = "annual_subscription") Our application uses the following annual_subscription database table:Īn annual subscription is needed to be renewed every year on a given day, so the payment_date column stores the day and the month when the payment needs to be made. In this article, we are going to see how the JPA AttributeConverter works and how we can use it to customize the entity attribute to the database column mapping.įor instance, we could use a JPA AttributeConverter to map a Java MonthDay to a database DATE column because Hibernate doesn’t offer a built-in MonthDayType to handle this particular mapping. So, enjoy spending your time on the things you love rather than fixing performance issues in your production system on a Saturday night! Well, Hypersistence Optimizer is that tool!Īnd it works with Spring Boot, Spring Framework, Jakarta EE, Java EE, Quarkus, or Play Framework. Follow having a tool that can automatically detect JPA and Hibernate performance issues.
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