SQL Server：字符串操作来写出搜索引擎优化友好标题

Question

我需要按照一些规则给我写一个SEO朋友格式的歌曲标题。

最大lentgh是52个字符。目前截断发生在以CL开始的记录上，并且与一组关联ID有关。

额外的规则我要申请是：

• 如果seo_friendly_title以结束“ - ”将其删除。
• 如果 截断在单词或空格的中间结束，则移至下一空格（下一个单词的结尾） 。

我想我必须添加嵌套的CASE语句才能完成此操作，但我不知道在哪里添加这个新检查。

我想请求你帮忙完成这个算法，希望有人可以分享他们的经验，并展示/解释如何做到这一点。

非常感谢。

这里是我当前的SQL查询：

SELECT 
    [sfwt].[seo_friendly_title] 
, CASE  
     WHEN [sfwt].[pf_id] LIKE 'CL%' AND [pd].[AssociationID] IN (1, 3, 4) THEN 
      LEFT([sfwt].[seo_friendly_title], 52) 
    END [seo_final_title] 
FROM 
    [dbo].[SEOFriendly_WorkingTable] [sfwt] 
INNER JOIN [dbo].[ProductData] [pd] 
    ON [pd].[ProductID] = [sfwt].[pf_id] 
WHERE [sfwt].[pf_id] LIKE 'CL%' 
ORDER BY  
    [sfwt].[pf_id]; 

和输出：

seo_friendly_title seo_final_title 
prelude-no-5-for-trumpet-and-piano-johann-sebastian-bach prelude-no-5-for-trumpet-and-piano-johann-sebastian- 
prelude-no-8-for-trumpet-and-piano-johann-sebastian-bach prelude-no-8-for-trumpet-and-piano-johann-sebastian- 
highlights-from-the-lord-of-the-rings-the-return-of-the-king highlights-from-the-lord-of-the-rings-the-return-of- 
air-ecossais-spirituoso-e-marciale-opus-107-no-10-f-instrument-piano air-ecossais-spirituoso-e-marciale-opus-107-no-10-f- 
air-ecossais-spirituoso-e-marciale-opus-107-no-10-c-instrument-piano air-ecossais-spirituoso-e-marciale-opus-107-no-10-c- 
air-de-la-petite-russie-opus-107-no-3-bb-instrument-piano air-de-la-petite-russie-opus-107-no-3-bb-instrument- 
air-de-la-petite-russie-opus-107-no-3-eb-instrument-piano air-de-la-petite-russie-opus-107-no-3-eb-instrument- 
shell-be-coming-round-the-mountain-c-instrument-and-piano shell-be-coming-round-the-mountain-c-instrument-and- 
shell-be-coming-round-the-mountain-f-instrument-and-piano shell-be-coming-round-the-mountain-f-instrument-and- 
9-ecossaises-from-38-waltzer-landler-und-ecossaisen-op-18 9-ecossaises-from-38-waltzer-landler-und-ecossaisen- 

Answer 1

在这里，你去。更新09/27

SELECT 
    [sfwt].[seo_friendly_title] 
, CASE  
     WHEN [sfwt].[pf_id] LIKE 'CL%' AND [pd].[AssociationID] IN (1, 3, 4) and LEFT([sfwt].[seo_friendly_title], 52) LIKE '%-' THEN LEFT([sfwt].[seo_friendly_title], 51) 
     WHEN [sfwt].[pf_id] LIKE 'CL%' AND [pd].[AssociationID] IN (1, 3, 4) THEN LEFT([sfwt].[seo_friendly_title], 52) 
     WHEN [sfwt].[pf_id] LIKE 'CL%' AND [pd].[AssociationID] IN (1, 3, 4) and LEFT([sfwt].[seo_friendly_title], 52) NOT like '%-' 
      and left(Replace([sfwt].[seo_friendly_title],LEFT([sfwt].[seo_friendly_title], 52),''),1) <> '-' 
      and Charindex('-',Replace([sfwt].[seo_friendly_title],LEFT([sfwt].[seo_friendly_title], 52),'') = 0 then [sfwt].[seo_friendly_title] 
     WHEN [sfwt].[pf_id] LIKE 'CL%' AND [pd].[AssociationID] IN (1, 3, 4) and LEFT([sfwt].[seo_friendly_title], 52) NOT like '%-' 
      and left(Replace([sfwt].[seo_friendly_title],LEFT([sfwt].[seo_friendly_title], 52),''),1) <> '-' 
      and Charindex('-',Replace([sfwt].[seo_friendly_title],LEFT([sfwt].[seo_friendly_title], 52),'') != 0 then LEFT([sfwt].[seo_friendly_title], 51 + Charindex('-',Replace([sfwt].[seo_friendly_title],LEFT([sfwt].[seo_friendly_title], 52),''))) 
    END [seo_final_title] 
FROM 
    [dbo].[SEOFriendly_WorkingTable] [sfwt] 
INNER JOIN [dbo].[ProductData] [pd] 
    ON [pd].[ProductID] = [sfwt].[pf_id] 
WHERE [sfwt].[pf_id] LIKE 'CL%' 
ORDER BY  
    [sfwt].[pf_id]; 

Answer 2

你可以试试这个为1点，但我不明白的点数其中两个是“如果截断在单词或空格的中间结束，然后移到下一个空格（下一个单词的结尾）。“你能分享一下这个例子吗？

SELECT 
    [sfwt].[seo_friendly_title] 
, CASE  
     WHEN [sfwt].[pf_id] LIKE 'CL%' AND [pd].[AssociationID] IN (1, 3, 4) and LEFT([sfwt].[seo_friendly_title], 52) LIKE '%-' THEN LEFT([sfwt].[seo_friendly_title], 51) 
     WHEN [sfwt].[pf_id] LIKE 'CL%' AND [pd].[AssociationID] IN (1, 3, 4) THEN LEFT([sfwt].[seo_friendly_title], 52) 
    END [seo_final_title] 
FROM 
    [dbo].[SEOFriendly_WorkingTable] [sfwt] 
INNER JOIN [dbo].[ProductData] [pd] 
    ON [pd].[ProductID] = [sfwt].[pf_id] 
WHERE [sfwt].[pf_id] LIKE 'CL%' 
ORDER BY  
    [sfwt].[pf_id];