无限级分类的非递归实现(存储过程版）

Begin Tran

--获取修改前的：Parent_ID,Column_Depth,Column_Order
Declare @oParent_ID As int
Declare @oColumn_Depth As int
Declare @oColumn_Order As int
Declare @oColumn_Path As nvarchar(1000)

Select @oParent_ID = Parent_ID, @oColumn_Depth = Column_Depth,@oColumn_Order = Column_Order, @oColumn_Path = Column_Path From Tb_Column Where Column_ID = @Column_ID
IF @oParent_ID Is Null
Begin
Set @Err = 1
Goto theEnd
End

--如果父ID没有改变，则直接修改栏目名和栏目简介
IF @oParent_ID = @Parent_ID
Begin
Update Tb_Column Set Column_Name = @Column_Name,Column_Intro = @Column_Intro Where Column_ID = @Column_ID
IF @@Error <> 0
Set @Err = 2
Goto theEnd
End

Declare @nColumn_Path As nvarchar(1000)
Declare @nColumn_Depth As int
Declare @nColumn_Order As int

--获取当前节点作为父节点所包含的节点数[包括自身] 注：如果返回 “1” 说明是单节点
Declare @theCount As int
Select @theCount = Count(Column_ID) From Tb_Column Where Column_ID=@Column_ID Or Column_Path like '' @oColumn_Path '|%'
IF @theCount Is Null
Begin
Set @Err = 3
Goto theEnd
End

IF @Parent_ID=0 --如果是设置为顶级节点，将节点设置为最后一个顶级节点
Begin
--Print '设置为顶级栏目'
Set @nColumn_Path = Ltrim(Str(@Column_ID))
Set @nColumn_Depth =1

Select @nColumn_Order = Max(Column_Order) From Tb_Column
IF @nColumn_Order Is NULL
Begin
Set @Err = 4
Goto theEnd
End

Set @nColumn_Order = @nColumn_Order - @theCount 1

--更新三部分 1 节点本身 2 所有子节点 2 本树更改之前的后面记录的顺序
--Print '更新本栏目之前位置后面的所有栏目[不包括本栏目下的子栏目]的：Column_Order'
Update Tb_Column Set Column_Order = Column_Order-@theCount Where (Column_Order >@oColumn_Order) And (Column_Path Not like '' @oColumn_Path '|%')
IF @@Error <> 0
Begin
Set @Err = 7
Goto theEnd
End

--Print '更新本栏目的：Parent_ID,Column_Path,Column_Depth,Column_Order,Column_Name,Column_Intro'
Print 'Order : ' Ltrim(Str(@nColumn_Order))
Update Tb_Column Set Parent_ID=@Parent_ID,Column_Path = @nColumn_Path,Column_Depth = @nColumn_Depth,Column_Order = @nColumn_Order, Column_Name = @Column_Name,Column_Intro = @Column_Intro Where Column_ID = @Column_ID
IF @@Error <> 0
Begin
Set @Err = 5
Goto theEnd
End

--Print '更新本栏目下的所有子栏目的：Column_Path,Column_Depth,Column_Order'
Update Tb_Column Set Column_Path = Replace(Column_Path,@oColumn_Path,@nColumn_Path),Column_Depth = Column_Depth (@nColumn_Depth-@oColumn_Depth),Column_Order = Column_Order ( @nColumn_Order-@oColumn_Order) Where Column_Path like '' @oColumn_Path '|%'
IF @@Error <> 0
Begin
Set @Err = 6
Goto theEnd
End

End
Else
Begin
--获取未来父节点的相关信息,并设置本节点的相关值
Select @nColumn_Depth = Column_Depth,@nColumn_Path = Column_Path From Tb_Column Where Column_ID = @Parent_ID
IF @nColumn_Depth Is NULL Or @nColumn_Path Is Null
Begin
Set @Err = 8
Goto theEnd
End
Set @nColumn_Depth = @nColumn_Depth 1
Select @nColumn_Order =Max(Column_Order) From Tb_Column Where Column_ID = @Parent_ID Or Column_Path like '' @nColumn_Path '|%'
IF @nColumn_Order Is NULL
Begin
Set @Err = 9
Goto theEnd
End

Set @nColumn_Path = @nColumn_Path '|' Ltrim(Str(@Column_ID))

IF @nColumn_Order = @oColumn_Order 1 --如果新的父节点是原来位置上端最近一个兄弟,则所有节点的顺序都不改变
Begin
Update Tb_Column Set Parent_ID=@Parent_ID,Column_Path = @nColumn_Path,Column_Depth = @nColumn_Depth, Column_Name = @Column_Name,Column_Intro = @Column_Intro Where Column_ID = @Column_ID
IF @@Error <> 0
Begin
Set @Err = 10
Goto theEnd
End
End

Set @nColumn_Order = @nColumn_Order 1

--更新三部分 1 本树更改之前的后面（或前面）记录的顺序 1 节点本身 3 所有子节点
--分为向上移或象下移
--Print '更新本栏目之前位置后面的所有栏目[或者本栏目之后位置] [不包括本栏目下的子栏目]的：Column_Order'
IF @nColumn_Order < @oColumn_Order
Begin
Update Tb_Column Set Column_Order = Column_Order @theCount Where Column_Order<@oColumn_Order And Column_Order >=@nColumn_Order And (Column_Path Not like '' @oColumn_Path '|%') And Column_ID<>@Column_ID
IF @@Error <> 0
Begin
Set @Err = 12
Goto theEnd
End
End
Else
Begin
Update Tb_Column Set Column_Order = Column_Order-@theCount Where Column_Order >@oColumn_Order And Column_Order<@nColumn_Order And (Column_Path Not like '' @oColumn_Path '|%') And Column_ID<>@Column_ID

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