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。
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;
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;