GORM：对新属性的空检查导致 QueryException

Question

我已将新的属性 uuid 添加到以前存在的域 class BComponent:

的 GORM 映射中

static mapping = {
  tablePerHierarchy false
  id column:'bc_id'
  uuid column:'bc_uuid', type:'text'
  name column:'bc_name', type:'text', index:'bc_name_idx'
  normname column:'bc_normname', type:'text', index:'bc_normname_idx'
  version column:'bc_version'
  // ... other properties
}

在 BootStrap.groovy 中执行处理此新属性的代码时，例如...

BComponent.withTransaction() {
  BComponent.executeQuery("select bc.id from BComponent as bc where bc.uuid is null").each { bc_id ->
    BComponent.withNewTransaction {
      BComponent bc = BComponent.get(bc_id)
      bc.generateUuid()
      bc.save()
      bc.discard()
    }
  }
}

...抛出以下异常：

ERROR context.GrailsContextLoaderListener  - Error initializing the application: could not resolve property: uuid of: org.gokb.cred.BComponent [select bc.id from org.gokb.cred.BComponent as bc where bc.uuid is null]; nested exception is org.hibernate.QueryException: could not resolve property: uuid of: org.gokb.cred.BComponent [select bc.id from org.gokb.cred.BComponent as bc where bc.uuid is null]
org.springframework.orm.hibernate3.HibernateQueryException: could not resolve property: uuid of: org.gokb.cred.BComponent [select bc.id from org.gokb.cred.BComponent as bc where bc.uuid is null]; nested exception is org.hibernate.QueryException: could not resolve property: uuid of: org.gokb.cred.BComponent [select bc.id from org.gokb.cred.BComponent as bc where bc.uuid is null]
    at org.springframework.orm.hibernate3.SessionFactoryUtils.convertHibernateAccessException(SessionFactoryUtils.java:671)
    at org.springframework.orm.hibernate3.HibernateAccessor.convertHibernateAccessException(HibernateAccessor.java:414)
    at org.springframework.orm.hibernate3.HibernateTemplate.doExecute(HibernateTemplate.java:416)
    at org.springframework.orm.hibernate3.HibernateTemplate.executeFind(HibernateTemplate.java:348)
    ...

这是为什么？我的空检查不正确吗？我从类似的检查中采用了它，效果很好，比如：

BComponent.executeQuery("select bc.id from BComponent as bc where bc.normname is null and bc.name is not null") // ...

我是不是忘记了什么？我已经执行了

$ grails clean

还有什么？谢谢！

Answer 1

我忘记在我的 Groovy class 代码中添加 uuid 作为属性。所以：

class BComponent{
  // ...
  String uuid
  // ...
}

已解决问题。

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