Grails枚举映射 [英] Grails Enum Mapping

查看:101
本文介绍了Grails枚举映射的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

在Grails中,有没有办法限制枚举映射到的列的大小。在下面的例子中,我希望列类型为char(2)

  enum FooStatus {
BAR( 'br'),TAR('tr')
final static String id
}
$ b $ class Foo {
FooStatus status

static constraints = {
status(inList:FooStatus.values()* .id,size:2..2)
}
}
pre>

在导出模式时,inList和size都不起作用,列类型保持默认值(varch(255))
也许我可以这样做,如果我定义一个新的UserType。任何想法?



谢谢您
-ken

解决方案

考虑到枚举在GORM内部映射的方式,我认为这是不可能的。但将代码更改为这样:

  enum FooStatus {
BAR('br'),
TAR('tr')
private FooStatus(String id){this.id = id}
final String id

static FooStatus byId(String id){
values()。find {it.id == id}
}
}

  class Foo {
字符串状态

FooStatus getFooStatus(){status ? FooStatus.byId(status):null}
void setFooStatus(FooStatus fooStatus){status = fooStatus.id}

static transients = ['fooStatus']

静态约束= {
status inList:FooStatus.values()* .id
}

static mapping = {
status sqlType:'char(2)'


$ / code>

添加瞬态获取器和设置器允许您设置或获取String(id)或枚举值。


in Grails, Is there a way to limit the size of the column to which the enum is mapped. In the following example, i would like the column type to be char(2)

enum FooStatus {
    BAR('br'), TAR('tr')
    final static String id
}

class Foo {
    FooStatus status

    static constraints = {
        status(inList:FooStatus.values()*.id,size:2..2)
    }
}

both inList and size do not have any effect when exporting the schema, the column type keeps its default value (varch(255)) Maybe i could do that if i define a new UserType. Any idea ?

Thank you -ken

解决方案

I don't think it's directly possible given the way enums are mapped internally in GORM. But changing the code to this works:

enum FooStatus {
   BAR('br'),
   TAR('tr')
   private FooStatus(String id) { this.id = id }
   final String id

   static FooStatus byId(String id) {
      values().find { it.id == id }
   }
}

and

class Foo {
   String status

   FooStatus getFooStatus() { status ? FooStatus.byId(status) : null }
   void setFooStatus(FooStatus fooStatus) { status = fooStatus.id }

   static transients = ['fooStatus']

   static constraints = {
      status inList: FooStatus.values()*.id
   }

   static mapping = {
      status sqlType: 'char(2)'
   }
}

Adding the transient getter and setter allows you to set or get either the String (id) or enum value.

这篇关于Grails枚举映射的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!

查看全文
登录 关闭
扫码关注1秒登录
发送“验证码”获取 | 15天全站免登陆