Grails域类与存储过程结果集的关联

Question

Hi All,

Is it possible to associate the resultset of a stored procedure to grails domain class...?

I got this database view mapped to an domain class, which works like a charm, but in a typical functionality i need to generate db view based on certain parameters given by the end user. In that case i cant pass parameters to db view, so i created a stored procedure which would give me the same resultset as view but after calculations involving multiple table & getting parameters from end user.

In grails views (list.gsp) most of the plugin that i use is based on domain class , for ex: filterpane. So i cant just simply display the resultet from stored proc into grails

I am a newbie to grails. I have gone through grails froums, googled alot but unable to get any suggestions in this topic.

Answer 1

Grails provide transient fields to use when you need calculation fields in domain classes. You can wrap your calculation logic in a service, changing your domain class instances before using it.

class MyDomain {
  BigDecimal calcField

  static transients = ['calcField']
}

class MyService {
  def dataSource

  List<MyDomain> getInstances() {
    def instances = MyDomain.findAllBy...()
    instances.each { MyDomain ins ->
       doCalcField(ins)
    }

    instances

  }

  void doCalcField(MyDomain myDomain) {
    groovy.sql.Sql sql = new Sql(dataSource)
    //call procedure, returning values as OUT
    myDomain.calcField = calcField //assign out to domain instance
  }

}

Depending on your calculations, it's better to do it in the service directly, making your code database independent.