doctrine - 如何强制 "hint"实体字段应在 yaml 中建立索引？

Question

Doctrine 2 中是否有任何方法可以提示在自动生成数据库时应该对列建立索引？我有一个线程实体:

Entities\Thread:
  type: entity
  table: Thread
  repositoryClass: Repositories\ThreadRepository
  id:
    id:
      type: integer
      generator:
        strategy: AUTO
  fields:
    type:
      type: enumthreadtype
    code:
      type: string
      length: 10
      nullable: true
  manyToOne:
    group:
      targetEntity: Group
      inversedBy: threads
  oneToMany:
    messages:
      targetEntity: Message
      mappedBy: thread
    attachments:
      targetEntity: ThreadAttachment
      mappedBy: thread

通常通过“代码”(10 个字符的随机字符串)而不是 ID 来搜索线程。有没有办法表明应该使用 yaml 创建索引，或者我只需要在创建表后在数据库中执行此操作？

Answer 1

我在yaml中找不到这方面的文档，但是在阅读Doctrine\ORM\Mapping\ClassMetadatainfo之后我发现它如下

如果你想索引你的代码字段，你的 yaml 映射将是

Entities\Thread:
  type: entity
  table: Thread
  indexes:
      # _idx as suffix...
      thread_code_idx:
          columns: [ code ]
      # We can specify multiple indexes 
      another_idx
          # we can specify multiple columns for compound indexes
          columns [ type, code ] 
  repositoryClass: Repositories\ThreadRepository
  id:
    id:
      type: integer
      generator:
        strategy: AUTO
  fields:
    type:
      type: enumthreadtype
    code:
      type: string
      length: 10
      nullable: true
  manyToOne:
    group:
      targetEntity: Group
      inversedBy: threads
  oneToMany:
    messages:
      targetEntity: Message
      mappedBy: thread
    attachments:
      targetEntity: ThreadAttachment
      mappedBy: thread