限级分类的非递归实现(二)

　　存储过程三：编辑分类

CREATE PROCEDURE sp_Column_Update
(
@Column_ID int,
@Parent_ID int,
@Column_Name nvarchar(50),
@Column_Intro nvarchar(1000)
)
AS
Declare @Err As int
Set @Err=0
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 --如果是设置为优异节点，将节点设置为最后一个优异节点
Begin
--Print '设置为优异栏目'
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,C
olumn_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
IF @@Error <> 0
Begin
Set @Err = 13
Goto theEnd
End
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))
IF @nColumn_Order > @oColumn_Order
Set @nColumn_Order = @nColumn_Order - @theCount
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 = 10
Goto theEnd
End
--Print '更新本栏目下的所有子栏目的：Column_Paht,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 = 11
Goto theEnd
End
End
theEnd:
IF @Err<>0 --如果有错误则返回错误号
Begin
Rollback Tran
Return @Err
End
Else     --如果没有错误就返回0
Begin
Commit Tran
Return 0
End
GO

　　存储过程四：显示分类（只是一条select语句）

　　分类列表：

CREATE PROCEDURE sp_Column_List
AS
SELECT Column_ID, Column_Name, Parent_ID, Column_Path, Column_Depth,
Column_Order, Column_Intro
FROM Tb_Column
ORDER BY Column_Order
GO