ENTITY ANNOTATION IN SPRING CODE
This way any code using the module doesn’t need to know that JPA is used for persistence. I’m using DTOs to transfer data into and out of the module. There’s an entity called CityEntity, it is marked as internal because I don’t want it to be visible outside the module it is defined in. We can use data classes alongside the usual JPA annotations to create entities – this is what I came up with:ģ internal data class CityEntity ( 4 Id val id: Long ? = null,ġ4 15 fun fromDto(dto: CityDto ) = CityEntity (ġ9 20 fun fromDto(dto: CreateCityDto ) = CityEntity (Ģ3 24 fun fromDto(dto: UpdateCityDto, defaultCity: CityEntity ) = CityEntity (Ģ7 description = dto.description ?: scription) When writing Java code, you can use libraries like Lombok, Immutables or AutoValue to achieve something similar, Kotlin provides this out of the box. Data classes are one of Kotlin’s treasures: you can use them for classes that mainly hold data and Kotlin will automatically provide methods like equals(), hashCode(), toString(), and copy(). Apart from a technical id, a city consists of a mandatory name and an optional description.
ENTITY ANNOTATION IN SPRING UPDATE
My sample project provides a way to store, retrieve and update representations of cities. In order to integrate JPA with Spring Boot, we start by referencing the corresponding starter module – now we can add some entities. I’ve simplified the code samples below for better readability, you can access the complete source code here. Instead I will share my learnings with regard to integrating JPA as well as a few other things I came across along the way.
I won’t go into the web part again – please refer to Jaspers post for that. A few weeks ago, my colleague Jasper presented his experiences using Kotlin with Spring. It is used in many projects and so I think it’s worthwhile to examine how you can use it through Kotlin and Spring. There are different implementations for JPA, the most widely known being Hibernate. Being a Java programmer you’re probably familiar with the Java Persistence API : it is used to map database contents to objects. I’ve been looking at Kotlin for a while now and since Spring will support Kotlin as a first class language from version 5 onward I wanted to see how they currently work together.
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