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我有那些领域类:SQL错误 - #2没有设置
class Person{
String username
}
class Course {
String code
static hasMany = [events:Event]
}
class Event {
Long id
String name
(...)
static belongsTo = [course:Course, parallel:Parallel]
static hasMany = [teachers: Person, students: Person,bought: Exchange, sold: Exchange]
}
我想要做的就是找到一个学生和相关联的所有事件是什么当然。我做了这个查询:
(...)
println "User: ${person.username}"
println "Course: ${course.code}"
Set<Person> persons = []
persons.add(person)
def events = Event.findAllByCourseAndStudents(course, persons)
}
但是,这是给我的错误ERROR util.JDBCExceptionReporter - Parameter "#2" is not set; SQL statement:
缺少什么我在这里?