介绍一个非递归无限级分类的存储过程版以及应用例子

时间:2009-12-21 11:47来源:未知作者:admin 点击: 次

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这个无限级分类主要是读取一句Select语句就够了,不使用递归，理论上无限级。功能：增加分类、编辑分类、删除分类、分类排序 =====================================================================

这个无限级分类主要是读取一句Select语句就够了,不使用递归，理论上无限级。

功能：增加分类、编辑分类、删除分类、分类排序
======================================================================
表结构：
表名：Tb_Column
表结构（所有字段非空）：
Column_ID        int 主键（注：非标识）
Column_Name      nvarchar(50)分类名称
Parent_ID        int 父分类ID（默认值0）
Column_Path      nvarchar(1000) 分类路径
Column_Depth     int分类深度(默认值0）
Column_Order     int排序(默认值0)
Column_Intro     nvarchar(1000)分类说明

===============================================================================
存储过程一：新建分类

CREATE PROCEDURE sp_Column_Insert
(
@Parent_ID int,
@Column_Name nvarchar(50),
@Column_Intro nvarchar(1000)
)
AS
Declare @Err As int
Set @Err=0

Begin Tran
--通过现有记录获取栏目ID
Declare @Column_ID As int
Declare @Column_Depth As int
Select @Column_ID = Max(Column_ID) From Tb_Column
IF @Column_ID Is Not Null
Set @Column_ID = @Column_ID+1
Else
Set @Column_ID = 1

--判断是否是顶级栏目，设置其Column_Path和Column_Order
Declare @Column_Path As nvarchar(1000)
Declare @Column_Order As int
IF @Parent_ID = 0
Begin
Set @Column_Path =Ltrim(Str(@Column_ID))
Select @Column_Order = Max(Column_Order) From Tb_Column
IF @Column_Order Is Not Null
Set @Column_Order = @Column_Order + 1
Else --如果没有查询到记录，说明这是第一条记录
Set @Column_Order = 1

--深度
Set @Column_Depth = 1
End
Else
Begin
--获取父节点的路径和深度
Select @Column_Path = Column_Path ,@Column_Depth = Column_Depth From Tb_Column Where

Column_ID=@Parent_ID
IF @Column_Path Is Null
Begin
Set @Err = 1
Goto theEnd
End

--获取同父节点下的最大序号
Select @Column_Order = Max(Column_Order) From Tb_PicColumn Where Column_Path like

''+@Column_Path+'|%' Or Column_ID = @Parent_ID
IF @Column_Order Is Not Null --如果序号存在，那么将该序号后的所有序号都加1
Begin
--更新当前要插入节点后所有节点的序号
Update Tb_Column Set Column_Order = Column_Order +1 Where Column_Order

>@Column_Order
--同父节点下的最大序号加上1，构成自己的序号
Set @Column_Order = @Column_Order + 1
End
Else
Begin
Set @Err=1
Goto theEnd
End

--父节点的路径加上自己的ID号，构成自己的路径
Set @Column_Path = @Column_Path + '|' + Ltrim(Str(@Column_ID))

--深度
Set @Column_Depth = @Column_Depth+1

End

Insert Into Tb_Column(Column_ID,Column_Name,Parent_ID,Column_Path,Column_Depth,Column_Order,Column_Intro)

Values(@Column_ID,@Column_Name,@Parent_ID,@Column_Path,@Column_Depth,@Column_Order,@Column_Intro)

IF @@Error<>0
Begin
Set @Err=1
Goto theEnd
End

--更新当前记录之后的记录的ORDER
--Update Tb_Column Set Column_Order = Column_Order+1 Where Column_Order > @Column_Order

theEnd:
IF @Err=0
Begin
Commit Tran
Return @Column_ID
End
Else
Begin
Rollback Tran
Return 0
End
GO

=============================================================================
存储过程二：删除分类
CREATE PROCEDURE sp_Column_Delete
(
@Column_ID int
)
AS
Declare @Err As int
Set @Err = 0
Begin Tran
--首先查询该节点下是否有子节点
Select Column_ID From Tb_Column Where Parent_ID = @Column_ID
IF @@RowCount<>0
       Begin
       Set @Err = 1
       Goto theEnd
       End

--获取该节点的Column_Order,为了删除后整理其他记录的顺序
Declare @Column_Order As int
Select @Column_Order = Column_Order From Tb_Column Where Column_ID = @Column_ID
IF @Column_Order Is NUll
       Begin
         Set @Err =2
         Goto theEnd
       End

--更新其他记录的Column_Order
Update Tb_Column Set Column_Order = Column_Order -1 Where Column_Order >@Column_Order
IF @@Error<>0
       Begin
         Set @Err =3
         Goto theEnd
       End

--删除操作
Delete From Tb_Column Where Column_ID=@Column_ID
IF @@Error<>0
       Begin
         Set @Err =4
         Goto theEnd
     End

--更新其他记录的Column_ID
--Update Tb_Column Set Column_ID= Column_ID - 1 Where Column_ID >@Column_ID
--IF @@Error<>0
--       Begin
--         Set @Err =5
--         Goto theEnd
--       End

theEnd:
IF @Err = 0
       Begin
         Commit Tran
         Return 0 --删除成功
       End
Else
       Begin
         IF @Err=1
     Begin
         Rollback Tran
         Return 1 --有子节点
End
         Else
Begin
         Rollback Tran
         Return 2--未知错误
End
       End
GO