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我有2個名爲'employees'和'dataentry'的表。我需要將employees表中的employee_id列設置爲主鍵，並將dataentry中的employee_id列設置爲employees.employee_id的外鍵。我如何在groovy域類中做到這一點。Grails中的對象關係映射
here is my employees.groovy model class
package com.standout.utilityapplication
import java.util.Date;
import com.standout.utilityapplication.Dataentry
class Employees {
static mapping = {
\t table 'employees'
\t \t version false
}
static hasMany = [employee_id:Dataentry]
\t \t String employee_id
\t \t String employee_name
\t \t String team
\t \t Long contact_no
\t \t String designation
\t \t
\t \t
\t \t static constraints = {
\t \t \t
\t \t \t employee_id(nullable: false,maxSize:10)
\t \t \t employee_name(nullable: false,maxSize:100)
\t \t \t team(nullable: true,maxSize:40)
\t \t \t contact_no(nullable: true,maxSize:10)
\t \t \t designation(nullable: true,maxSize:40)
\t \t \t
\t \t }
}and here is my dataentry.groovy model class
package com.standout.utilityapplication
import com.standout.utilityapplication.Employees
class Dataentry {
\t static mapping = {
\t \t table 'dataentry'
\t \t version false
}
\t static belongsTo = [employee_id:Employees]
\t \t String employee_id
\t \t String team
\t \t Date receipt_dt
\t \t String restaurant_name
\t \t int number_of_persons
\t \t float amount
\t \t Date bill_submitted_dt
\t \t String reimbursed
\t \t char presented_bank_fl
\t \t Date presented_bank_dt
\t \t String create_id
\t \t Date create_dt
\t \t String mod_id
\t \t Date mod_dt
\t \t
\t \t
\t \t static constraints = {
\t \t \t reimbursed(nullable: true)
\t \t \t presented_bank_fl(nullable: true)
\t \t \t presented_bank_dt(nullable: true)
\t \t \t mod_id(nullable: true)
\t \t \t mod_dt(nullable: true)
\t \t }
}請告訴我如何使級聯映射