通过Grails中的动态查找器请求
我有三个领域类别:通过Grails中的动态查找器请求,grails,gorm,Grails,Gorm,我有三个领域类别: class Cafee { String cafeeName static hasMany = [halls: HallsZones] static constraints = { halls nullable: true } } class HallsZones { String hallName static scaffold = true static hasMany = [table :
class Cafee {
String cafeeName
static hasMany = [halls: HallsZones]
static constraints = {
halls nullable: true
}
}
class HallsZones {
String hallName
static scaffold = true
static hasMany = [table : TablePlacesInfo]
static belongsTo = [cafee : Cafee]
static constraints = {
table nullable: true
cafee nullable: true
}
}
class TablePlacesInfo {
int placesInTableAmount
int tableAmount
int tableForReservationAmount
int placeCost
String currencyType
static scaffold = true
static belongsTo = [hall: HallsZones]
static constraints = {
hall nullable: true
}
}
如您所见,classess通过链相互连接:
Cafee-(hasMany)->HallsZones-(hasMany)->TablePlacesInfo.
我想获得TablePlaces信息,它以HallsZones为家长,而HallsZones又以Cafee为家长。
我知道如何按家长搜索,例如:
def table = TablePlacesInfo.findWhere(hall : params['hallsAvailable'], placesInTableAmount : Integer.parseInt(params['tablePlacesAvailable']))
但是如何按祖父母搜索呢?使用
where
查询:
TablePlacesInfo.where {
hall {
cafee {
// criteria matching grand parent
id == 1L // for example
}
}
}.list()
使用标准
:
TablePlacesInfo.withCriteria {
hall {
cafee {
// criteria matching grand parent
idEq 1L // for example
}
}
}
使用hql:
TablePlacesInfo.executeQuery(
"""select tpi from TablePlacesInfo as tpi
inner join tpi.hall as hall
inner join hall.cafee as caf
where caf.id = 1"""
)
选择
DetachedCriteria
或where
将是一种可靠的方法,而不是动态查找程序。id
在域类中默认为长,因此1L(长1)用于比较,尽管在where查询的情况下,它将被强制为长,但我是特定的。