sql - Grails joinTable 查询问题

Question

我有一个用户域和一个角色域以及一个在用户端编码为的工作 joinTable

static hasMany = [ roles: Role ]
...
static mapping = {
    table 'user_data'
    id column: 'employee_number', name: 'employeeNumber', generator: 'assigned', type: 'int'
    version false
    sort 'lastName'

    roles joinTable: [ name: 'user_role' ]

}

我正在尝试查询数据库以提取具有安全官角色的所有用户

def roleInstance = Role.find { name == 'security_officer' }
def secList = User.findAll("from User as u where u.roles = :roleInstance", [roleInstance:roleInstance]) 

但我得到了错误

Class: com.microsoft.sqlserver.jdbc.SQLServerException
Message: The value is not set for the parameter number 1.

我究竟做错了什么？

Answer 1

我通过一堆猜测和检查弄清楚了。

 def roleInstance = Role.findByName("security_officer")
 def query = User.where { 
     roles { 
         id == roleInstance.id 
     } 
 }
 def securityOfficerList = query.list()

Answer 2

Roles 是一个 hasMany 关系，所以我认为以下应该有效。

def secList = User.findAll("from User as u where u.roles in (:roleInstance)", [roleInstance:[roleInstance]]) 

Answer 3

用户有很多角色，所以在查询中你不能使用 u.roles = roleInstance.Try to use in [list of roles] 或者你可以试试下面的查询： def secList = User.findAll("from User as u where u .roles in (from Role r where r.name=:roleInstance)", [roleInstance:roleInstance])