ASP 递归调用 已知节点查找根节点的函数

Function getTreeRootId(pNodeId) 
getSQL = "select note_id,parent_id from [T_tree_demo] where note_id='"& pNodeId &"'" 
Set getRs = db.Execute(getSQL) 
If Not getRs.eof Then 
If Trim(getRs("parent_id")) = "0" Then 
getTreeRootId = Trim(getRs("note_id")) 
Exit Function 
Else 
getTreeRootId = getTreeRootId(Trim(getRs("parent_id"))) 
End If 
Else 
getTreeRootId = 0 
Exit Function 
End If 
getRs.close 
Set getRs = Nothing 
End Function