视图解决树形结构数据查询

如果是树形结构，展示在列表中，我们希望按照树形结构的排序，怎么做呢？可以使用视图。

USE [ADataBase]
GO
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE VIEW [dbo].[VW_RP_CLASSIFY]
AS
WITH temp AS (
        SELECT ID, Level, IsUse, LimitTime, Mark
            , PID, Name, BrandID, sort, DelFlg
            , CreateBy, CreateTime, UpdateBy, UpdateTime, CAST(ROW_NUMBER() OVER (ORDER BY sort) AS varbinary(MAX)) AS sortpath
        FROM RP_CLASSIFY
        WHERE PID IS NULL
        UNION ALL
        SELECT a.ID, a.Level, a.IsUse, a.LimitTime, a.Mark
            , a.PID, a.Name, a.BrandID, a.sort, a.DelFlg
            , a.CreateBy, a.CreateTime, a.UpdateBy, a.UpdateTime
            , b.sortpath + CAST(ROW_NUMBER() OVER (PARTITION BY b.sortpath ORDER BY a.sort) AS varbinary(MAX))
        FROM RP_CLASSIFY a
            INNER JOIN temp b ON a.PID = b.ID
    )
SELECT ID, Level, IsUse, LimitTime, Mark
    , PID, Name, BrandID, sort, DelFlg
    , CreateBy, CreateTime, UpdateBy, UpdateTime, ROW_NUMBER() OVER (ORDER BY sortpath) AS rownum
FROM temp

GO

最后执行的sql：

SELECT *
FROM (
    SELECT ROW_NUMBER() OVER (ORDER BY rownum ASC) AS rownum, ID, Name, PID, Level
        , BrandID, Sort, IsUse, CreateBy, CreateTime
        , UpdateBy, UpdateTime, DelFlg, Mark, LimitTime
    FROM VW_RP_CLASSIFY
    WHERE DelFlg = 0
        AND BrandID IN (1, 0)
) t
WHERE t.rownum BETWEEN 1 AND 10