ͨTreeViewʵɾĲ顣

ݿ˵
classId
className
classDescrip
parentId,ţΪ0
sortId,,
ɾʱ򣬰sortIdڴ˱ŵģȫһ
ӵʱϼһ
Ƶʱǰ潻sortId,жǷѾǰˡǷΪ0
Ƶʱ潻sortId,жǷѾˡǷΪchildNum+1
depth,ȣ0Ϊ
childNumӼ0ΪûС

Ӳ
1.ǶparentId=0,depth=0
  sortId,ֵ
2.иchildNum1
  sortId,childNum+1,depthΪdepth+1

ɾ
1.жǷ࣬parentId=ǰclassId򲻿ɾ
2.ޣжǷǶи򸸼childNum1.
  ҵsortId,ѸsortIdڴ˵ļ1

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