MongoDB如何查询树结构某个节点的全部后代节点？
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假设记录树状部门层级的集合文档如下：
{
如何查询DeptID为000002的部门的全部下级部门呢？
"DeptID":"000001",
"DeptName":"AAAAA",
"ParentID":null
}
{
"DeptID":"000002",
"DeptName":"BBBBB",
"ParentID":"000001"
}
{
"DeptID":"000003",
"DeptName":"CCCCC",
"ParentID":"000001"
}
{
"DeptID":"000004",
"DeptName":"DDDDD",
"ParentID":"000002"
}
{
"DeptID":"000005",
"DeptName":"EEEEE",
"ParentID":"000002"
}
{
"DeptID":"000006",
"DeptName":"FFFFF",
"ParentID":"000004"
}
