Spring数据与Scala [英] Spring Data with Scala

问题描述

正如前面所提到的，不建议在Scala上使用Spring Data或Hibernate，因为它不适用于字节码操作（和某些接口不兼容）。

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然而我的问题是，因为可以用SBT并行编写Scala和Java，是不是一个好主意以Java编码我的存储库和服务，然后在我的Scala代码中使用它们？这是否摆脱了字节码约束？

我在这里问这里是因为找不到任何资源。

解决方案

使用Scala for Hibernate没有问题。你甚至不需要使用 @BeanProperty 。例如：

  @Entity 
类角色{
 @Id @GeneratedValue 
 var id ：Long = _ 
 
 @Index（name =role_name）
 var name：String = _ 
 
 var created_at：Date = _ 
 var updated_at：Date = _ 
 
 @ManyToMany 
 private var sub_role：java.util.Set [Role] = _ 
 def subRoles：Set [Role] = {
 if（sub_role == null）sub_role = new java.util.HashSet [Role] 
 sub_role 
} 
 
 @ManyToMany 
 private var permission：java.util。 Set [Permission] = _ 
 def permissions：设置[Permission] = {
 if（permission == null）permission = new java.util.HashSet [Permission] 
 permission 
 } 
} 
  

这是一个来自许多Scala / Hibernate项目之一的示例类我一直在努力。

您需要使用Java的一件事是自定义JSR-303验证注释。

As been asked before, it is not recommended to use Spring Data or Hibernate on Scala because it doesn't work well with it's byte code manipulation (and some interface incompatibilities).

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My question is however, because it is possible to code Scala and Java in parallel with SBT, is it a good idea to code my repositories and services in Java and then use them in my Scala code? Does this get rid of the byte code constraint?

I'm asking here because I couldn't find any resources on this.

解决方案

There are no issues using Scala for Hibernate. You don't even need to use @BeanProperty. For example:

@Entity
class Role {
  @Id @GeneratedValue
  var id: Long = _

  @Index(name="role_name")
  var name: String = _

  var created_at: Date = _
  var updated_at: Date = _  

  @ManyToMany
  private var sub_role: java.util.Set[Role] = _
  def subRoles: Set[Role] = {
    if (sub_role == null) sub_role = new java.util.HashSet[Role]
    sub_role
  }

  @ManyToMany
  private var permission: java.util.Set[Permission] = _
  def permissions: Set[Permission] = {
    if (permission == null) permission = new java.util.HashSet[Permission]
    permission
  }
}

This is an example class from one of a number of Scala/Hibernate projects I've worked on.

One thing that you do need to use Java for is custom JSR-303 validation annotations.

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