SQL Server CTE层次结构关键字搜索

时间：2012-11-23 02:26:08

标签： sql-server tsql search common-table-expression

我在电子商务商店存储过程中遇到了递归搜索的棘手问题。基本上，这个单个过程将返回基本过滤器和分页中的所有产品，并使用父/子类别表在层次结构中执行递归检查。这是非常有效的，CTE运行得非常快，但是最近添加的关键字搜索需要搜索类别名称，产品名称和样式编号，这引起了戏剧性的问题。

这开始看起来非常简单，因为第一个CTE已经基于提供的@categoryid生成了层次结构中所有相关类别的表，然后连接到所有过滤的产品特定表的其余部分。产品名称和样式编号搜索工作正常，但我不能让我的生活中的类别名称搜索工作，因为它需要在层次结构树中从顶部开始搜索类别树中的任何匹配。

编辑：我现在认为，对于存储所有关键字相关标签（如类别名称，产品名称和样式等）的产品添加“标签”表可能要容易得多，并直接针对标签进行搜索。 / H2>

例如，Category层次结构的子集如下所示：

Mens
- Polos
- Jerseys
- Pants

Womens
- Pants
- Shirts
- Polos

Supporters
- State Of Origin
  - Mens
  - Womens
  - Kids
- Bulldogs
   - Jerserys
   - Pants
   - Shirts
   - Caps
- Warratahs

在下面的示例代码中，我传递了一个搜索词“origin mens”，它应该返回“原产国”类别中同样属于“男士”类别的所有产品。它唯一匹配的是以“Origin”开头的产品名称，而不是别的，因为产品级别的类别不是“原产国”，因为这是父级。这里的任何帮助都太棒了！

-- Variable Declarations
DECLARE @categoryid int
DECLARE @minprice int
DECLARE @maxprice int
DECLARE @sizefilter int
DECLARE @colourfilter int
DECLARE @searchstring varchar(255)
DECLARE @totalrows int 

-- Variables values for testing
SET @categoryid = 0
SET @minprice = 0
SET @maxprice = 0
SET @sizefilter = 0
SET @colourfilter = 0
SET @searchstring = 'origin mens'

-- Setup paging table
DECLARE @indextable table (rownum int identity(1,1), recordid int);

BEGIN

-- First run CTE recursively over all categories in hierarchy
;WITH categoryCTE AS (

   SELECT cat.id as CategoryId, cat.name as CategoryName
   FROM  dbo.shopcategory AS cat
   WHERE (@categoryid = 0 OR cat.id = @categoryid)
   AND cat.isenabled = 1

   UNION ALL

   SELECT child.id as CategoryId, child.name as CategoryName
   FROM dbo.ShopCategory AS child

        INNER JOIN categoryCTE AS parent 
        ON child.parentid = parent.CategoryId

   WHERE child.isenabled = 1
 ),

 -- Now join CTE onto products tables via linker product_shopcategory
 productsCTE AS (

     SELECT p.id, ppc.shopcategoryid, ppc.listorder as catlistorder
     FROM categoryCTE as cat

         INNER JOIN product_shopcategory ppc ON ppc.shopcategoryid = cat.CategoryId
         INNER JOIN product p ON ppc.productid = p.id
         INNER JOIN productlocality pl ON pl.productid = p.id

         -- ** SEARCH - Join List to Table function of keywords
         INNER JOIN dbo.udf_parseList(@searchString, ' ') s 
         ON (cat.CategoryName + p.Name + p.stylenumber LIKE '%' + s.array_Value + '%')

         LEFT JOIN product_quantity pq ON pq.productid = p.id AND pq.localityid = @localityid
         LEFT JOIN productcolour pc ON pc.productid = p.id
         LEFT JOIN productcolourswatch pcs ON pc.productcolourswatchid = pcs.id
         LEFT JOIN product_productsize pps ON pps.productid = p.id 
         LEFT JOIN productsize ps ON pps.productsizeid = ps.id 

     WHERE p.isenabled = 1

        AND pq.quantity > 1
        AND (pc.isenabled IS NULL OR pc.isenabled = 1)
        AND (@minprice = 0 OR pl.price >= @minprice)
        AND (@maxprice = 0 OR pl.price <= @maxprice)

        -- Colour Group Filters 
        AND (@colourfilter = 0
             OR 
              (pcs.swatchgroupid = @colourfilter AND (pq.productcolourid = pc.id AND pq.quantity > 0))
            )

        -- Size Group Filters
        AND (@sizefilter = 0 
              OR 
              (ps.sizegroupid = @sizefilter AND (pq.productsizeid = pps.productsizeid AND pq.quantity > 0))
            )

 )

-- Create Paging table of results and strip out duplicates with group by
INSERT INTO @indextable (recordid)
    SELECT  DISTINCT id 
    FROM    productsCTE
    GROUP BY id
    ORDER BY id;

1 个答案:

答案 0 :(得分：1)

终于解决了！我几乎走了创建完整标签表结构的道路，这样我就可以直接搜索关键字标签而不是直接数据，但是在尝试编写包含类别层次结构嵌套的产品标签表时，我找到了解决方案。非常简单。

在下面的解决方案过程中，我在CategoryCTE中创建了一个新列，用于保存以递归方式构建的以逗号分隔的类别名称列表，然后跟踪所提供的CategoryId的完整树。现在我有一个以逗号分隔的类别名称列表，然后我可以将其纳入我的第二个CTE并执行一个标准的LIKE子句，将其分为产品名称，样式编号和类别名称。最后，为了使搜索更加智能，我使关键字搜索包含所有关键字，以便“男性原点”只返回与这两个关键字匹配的产品，而不是任何匹配，这是使用NOT EXISTS子句完成的。

希望这可以帮助其他人快速执行！

-- Variable Declarations
DECLARE @categoryid int
DECLARE @minprice int
DECLARE @maxprice int
DECLARE @sizefilter int
DECLARE @colourfilter int
DECLARE @searchstring varchar(255)
DECLARE @totalrows int 

-- Variables values for testing
SET @categoryid = 0
SET @minprice = 0
SET @maxprice = 0
SET @sizefilter = 0
SET @colourfilter = 0
SET @searchstring = 'origin mens'

-- Setup paging table
DECLARE @indextable table (rownum int identity(1,1), recordid int);

BEGIN

-- First run CTE recursively over all categories in hierarchy inclusive of supplied categoryId
;WITH categoryCTE AS (

   SELECT cat.id as CategoryId, cat.name as CategoryName, 
          CONVERT(varchar(255),cat.name) AS Tags

   FROM   dbo.shopcategory AS cat
   WHERE  (@categoryid = 0 OR cat.id = @categoryid)
   AND    cat.isenabled = 1

   UNION ALL

   SELECT child.id as CategoryId, child.name as CategoryName, CONVERT(varchar(255),
          parent.Tags + CONVERT(varchar(32),',' + child.name)) AS Tags

   FROM dbo.ShopCategory AS child

        INNER JOIN categoryCTE AS parent 
        ON child.parentid = parent.CategoryId

   WHERE child.isenabled = 1
 ),

 -- Now join CTE onto products tables via linker product_shopcategory
 productsCTE AS (

     SELECT p.id, ppc.shopcategoryid, ppc.listorder as catlistorder
     FROM categoryCTE as cat

         INNER JOIN product_shopcategory ppc ON ppc.shopcategoryid = cat.CategoryId
         INNER JOIN product p ON ppc.productid = p.id
         INNER JOIN productlocality pl ON pl.productid = p.id
         LEFT JOIN product_quantity pq ON pq.productid = p.id AND pq.localityid = @localityid
         LEFT JOIN productcolour pc ON pc.productid = p.id
         LEFT JOIN productcolourswatch pcs ON pc.productcolourswatchid = pcs.id
         LEFT JOIN product_productsize pps ON pps.productid = p.id 
         LEFT JOIN productsize ps ON pps.productsizeid = ps.id 

     WHERE p.isenabled = 1

        AND pq.quantity > 1
        AND (pc.isenabled IS NULL OR pc.isenabled = 1)
        AND pl.localityid = @localityid
        AND (@minprice = 0 OR pl.price >= @minprice)
        AND (@maxprice = 0 OR pl.price <= @maxprice)

        -- Keyword Search filter
        AND (@searchstring = '' OR NOT EXISTS
                (
                SELECT  NULL
                FROM    dbo.udf_parseList(@searchString, ' ')
                WHERE   cat.Tags + p.Name + p.stylenumber + pc.stylenumber NOT LIKE '%' + array_Value + '%'
                )
            )

        -- Colour Group Filters 
        AND (@colourfilter = 0
             OR 
              (pcs.swatchgroupid = @colourfilter AND (pq.productcolourid = pc.id AND pq.quantity > 0))
            )

        -- Size Group Filters
        AND (@sizefilter = 0 
              OR 
              (ps.sizegroupid = @sizefilter AND (pq.productsizeid = pps.productsizeid AND pq.quantity > 0))
            )

 )

-- Create Paging table of results and strip out duplicates with group by
INSERT INTO @indextable (recordid)
    SELECT  DISTINCT id 
    FROM    productsCTE
    GROUP BY id
    ORDER BY id;
相关问题
最新问题