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

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