最好的方式来从string中删除的HTML标记在SQL Server中？
我有SQL Server 2005中包含HTML标记的数据，我想剥去所有的，只留下标签之间的文本。 理想情况下，也可以用＆lt; 与<等
有没有一个简单的方法来做到这一点，或有人已经有一些示例SQL代码？
我没有能力添加扩展存储的特效等，所以更喜欢纯SQL方法（最好是一个向后兼容SQL 2000）。 我想检索数据与剥离出来的HTML，而不是更新它，所以理想情况下，它将被写为一个函数，以方便重用。
所以例如转换这个：
<B>Some useful text</B> <A onclick="return openInfo(this)" href="http://there.com/3ce984e88d0531bac5349" target=globalhelp> <IMG title="Source Description" height=15 alt="Source Description" src="/ri/new_info.gif" width=15 align=top border=0> </A>> <b>more text</b></TD></TR> 对此：
Some useful text > more text
有一个UDF将这样描述：
用户定义函数去除HTML
CREATE FUNCTION [dbo].[udf_StripHTML] (@HTMLText VARCHAR(MAX)) RETURNS VARCHAR(MAX) AS BEGIN DECLARE @Start INT DECLARE @End INT DECLARE @Length INT SET @Start = CHARINDEX('<',@HTMLText) SET @End = CHARINDEX('>',@HTMLText,CHARINDEX('<',@HTMLText)) SET @Length = (@End - @Start) + 1 WHILE @Start > 0 AND @End > 0 AND @Length > 0 BEGIN SET @HTMLText = STUFF(@HTMLText,@Start,@Length,'') SET @Start = CHARINDEX('<',@HTMLText) SET @End = CHARINDEX('>',@HTMLText,CHARINDEX('<',@HTMLText)) SET @Length = (@End - @Start) + 1 END RETURN LTRIM(RTRIM(@HTMLText)) END GO
编辑：请注意，这是SQL Server 2005，但如果您将关键字MAX更改为4000，它也将在SQL Server 2000中工作。
如果您的HTML格式正确，我认为这是一个更好的解决scheme：
create function dbo.StripHTML( @text varchar(max) ) returns varchar(max) as begin declare @textXML xml declare @result varchar(max) set @textXML = REPLACE( @text, '&', '' ); with doc(contents) as ( select chunks.chunk.query('.') from @textXML.nodes('/') as chunks(chunk) ) select @result = contents.value('.', 'varchar(max)') from doc return @result end go select dbo.StripHTML('This <i>is</i> an <b>html</b> test')
这不是一个完整的新解决scheme，而是对afwebservant解决scheme的修正：
--note comments to see the corrections CREATE FUNCTION [dbo].[StripHTML] (@HTMLText VARCHAR(MAX)) RETURNS VARCHAR(MAX) AS BEGIN DECLARE @Start INT DECLARE @End INT DECLARE @Length INT --DECLARE @TempStr varchar(255) (this is not used) SET @Start = CHARINDEX('<',@HTMLText) SET @End = CHARINDEX('>',@HTMLText,CHARINDEX('<',@HTMLText)) SET @Length = (@End - @Start) + 1 WHILE @Start > 0 AND @End > 0 AND @Length > 0 BEGIN IF (UPPER(SUBSTRING(@HTMLText, @Start, 4)) <> '<BR>') AND (UPPER(SUBSTRING(@HTMLText, @Start, 5)) <> '</BR>') begin SET @HTMLText = STUFF(@HTMLText,@Start,@Length,'') end -- this ELSE and SET is important ELSE SET @Length = 0; -- minus @Length here below is important SET @Start = CHARINDEX('<',@HTMLText, @End-@Length) SET @End = CHARINDEX('>',@HTMLText,CHARINDEX('<',@HTMLText, @Start)) -- instead of -1 it should be +1 SET @Length = (@End - @Start) + 1 END RETURN RTRIM(LTRIM(@HTMLText)) END
来自@Goner Doug的答案，更新了一些东西：
– 尽可能使用REPLACE
– 预定义实体（如é转换é （我select了我需要的:-)
– 列表标签<ul> and <li>一些转换
ALTER FUNCTION [dbo].[udf_StripHTML] --by Patrick Honorez --- www.idevlop.com --inspired by http://stackoverflow.com/questions/457701/best-way-to-strip-html-tags-from-a-string-in-sql-server/39253602#39253602 ( @HTMLText varchar(MAX) ) RETURNS varchar(MAX) AS BEGIN DECLARE @Start int DECLARE @End int DECLARE @Length int set @HTMLText = replace(@htmlText, '<br>',CHAR(13) + CHAR(10)) set @HTMLText = replace(@htmlText, '<br/>',CHAR(13) + CHAR(10)) set @HTMLText = replace(@htmlText, '<br />',CHAR(13) + CHAR(10)) set @HTMLText = replace(@htmlText, '<li>','- ') set @HTMLText = replace(@htmlText, '</li>',CHAR(13) + CHAR(10)) set @HTMLText = replace(@htmlText, '’' collate Latin1_General_CS_AS, '''' collate Latin1_General_CS_AS) set @HTMLText = replace(@htmlText, '"' collate Latin1_General_CS_AS, '"' collate Latin1_General_CS_AS) set @HTMLText = replace(@htmlText, '&' collate Latin1_General_CS_AS, '&' collate Latin1_General_CS_AS) set @HTMLText = replace(@htmlText, '€' collate Latin1_General_CS_AS, '€' collate Latin1_General_CS_AS) set @HTMLText = replace(@htmlText, '<' collate Latin1_General_CS_AS, '<' collate Latin1_General_CS_AS) set @HTMLText = replace(@htmlText, '>' collate Latin1_General_CS_AS, '>' collate Latin1_General_CS_AS) set @HTMLText = replace(@htmlText, 'œ' collate Latin1_General_CS_AS, 'oe' collate Latin1_General_CS_AS) set @HTMLText = replace(@htmlText, ' ' collate Latin1_General_CS_AS, ' ' collate Latin1_General_CS_AS) set @HTMLText = replace(@htmlText, '©' collate Latin1_General_CS_AS, '©' collate Latin1_General_CS_AS) set @HTMLText = replace(@htmlText, '«' collate Latin1_General_CS_AS, '«' collate Latin1_General_CS_AS) set @HTMLText = replace(@htmlText, '®' collate Latin1_General_CS_AS, '®' collate Latin1_General_CS_AS) set @HTMLText = replace(@htmlText, '±' collate Latin1_General_CS_AS, '±' collate Latin1_General_CS_AS) set @HTMLText = replace(@htmlText, '²' collate Latin1_General_CS_AS, '²' collate Latin1_General_CS_AS) set @HTMLText = replace(@htmlText, '³' collate Latin1_General_CS_AS, '³' collate Latin1_General_CS_AS) set @HTMLText = replace(@htmlText, 'µ' collate Latin1_General_CS_AS, 'µ' collate Latin1_General_CS_AS) set @HTMLText = replace(@htmlText, '·' collate Latin1_General_CS_AS, '·' collate Latin1_General_CS_AS) set @HTMLText = replace(@htmlText, 'º' collate Latin1_General_CS_AS, 'º' collate Latin1_General_CS_AS) set @HTMLText = replace(@htmlText, '»' collate Latin1_General_CS_AS, '»' collate Latin1_General_CS_AS) set @HTMLText = replace(@htmlText, '¼' collate Latin1_General_CS_AS, '¼' collate Latin1_General_CS_AS) set @HTMLText = replace(@htmlText, '½' collate Latin1_General_CS_AS, '½' collate Latin1_General_CS_AS) set @HTMLText = replace(@htmlText, '¾' collate Latin1_General_CS_AS, '¾' collate Latin1_General_CS_AS) set @HTMLText = replace(@htmlText, '&Aelig' collate Latin1_General_CS_AS, 'Æ' collate Latin1_General_CS_AS) set @HTMLText = replace(@htmlText, 'Ç' collate Latin1_General_CS_AS, 'Ç' collate Latin1_General_CS_AS) set @HTMLText = replace(@htmlText, 'È' collate Latin1_General_CS_AS, 'È' collate Latin1_General_CS_AS) set @HTMLText = replace(@htmlText, 'É' collate Latin1_General_CS_AS, 'É' collate Latin1_General_CS_AS) set @HTMLText = replace(@htmlText, 'Ê' collate Latin1_General_CS_AS, 'Ê' collate Latin1_General_CS_AS) set @HTMLText = replace(@htmlText, 'Ö' collate Latin1_General_CS_AS, 'Ö' collate Latin1_General_CS_AS) set @HTMLText = replace(@htmlText, 'à' collate Latin1_General_CS_AS, 'à' collate Latin1_General_CS_AS) set @HTMLText = replace(@htmlText, 'â' collate Latin1_General_CS_AS, 'â' collate Latin1_General_CS_AS) set @HTMLText = replace(@htmlText, 'ä' collate Latin1_General_CS_AS, 'ä' collate Latin1_General_CS_AS) set @HTMLText = replace(@htmlText, 'æ' collate Latin1_General_CS_AS, 'æ' collate Latin1_General_CS_AS) set @HTMLText = replace(@htmlText, 'ç' collate Latin1_General_CS_AS, 'ç' collate Latin1_General_CS_AS) set @HTMLText = replace(@htmlText, 'è' collate Latin1_General_CS_AS, 'è' collate Latin1_General_CS_AS) set @HTMLText = replace(@htmlText, 'é' collate Latin1_General_CS_AS, 'é' collate Latin1_General_CS_AS) set @HTMLText = replace(@htmlText, 'ê' collate Latin1_General_CS_AS, 'ê' collate Latin1_General_CS_AS) set @HTMLText = replace(@htmlText, 'ë' collate Latin1_General_CS_AS, 'ë' collate Latin1_General_CS_AS) set @HTMLText = replace(@htmlText, 'î' collate Latin1_General_CS_AS, 'î' collate Latin1_General_CS_AS) set @HTMLText = replace(@htmlText, 'ô' collate Latin1_General_CS_AS, 'ô' collate Latin1_General_CS_AS) set @HTMLText = replace(@htmlText, 'ö' collate Latin1_General_CS_AS, 'ö' collate Latin1_General_CS_AS) set @HTMLText = replace(@htmlText, '÷' collate Latin1_General_CS_AS, '÷' collate Latin1_General_CS_AS) set @HTMLText = replace(@htmlText, 'ø' collate Latin1_General_CS_AS, 'ø' collate Latin1_General_CS_AS) set @HTMLText = replace(@htmlText, 'ù' collate Latin1_General_CS_AS, 'ù' collate Latin1_General_CS_AS) set @HTMLText = replace(@htmlText, 'ú' collate Latin1_General_CS_AS, 'ú' collate Latin1_General_CS_AS) set @HTMLText = replace(@htmlText, 'û' collate Latin1_General_CS_AS, 'û' collate Latin1_General_CS_AS) set @HTMLText = replace(@htmlText, 'ü' collate Latin1_General_CS_AS, 'ü' collate Latin1_General_CS_AS) set @HTMLText = replace(@htmlText, '"' collate Latin1_General_CS_AS, '"' collate Latin1_General_CS_AS) set @HTMLText = replace(@htmlText, '&' collate Latin1_General_CS_AS, '&' collate Latin1_General_CS_AS) set @HTMLText = replace(@htmlText, '‹' collate Latin1_General_CS_AS, '<' collate Latin1_General_CS_AS) set @HTMLText = replace(@htmlText, '›' collate Latin1_General_CS_AS, '>' collate Latin1_General_CS_AS) -- Remove anything between <STYLE> tags SET @Start = CHARINDEX('<STYLE', @HTMLText) SET @End = CHARINDEX('</STYLE>', @HTMLText, CHARINDEX('<', @HTMLText)) + 7 SET @Length = (@End - @Start) + 1 WHILE (@Start > 0 AND @End > 0 AND @Length > 0) BEGIN SET @HTMLText = STUFF(@HTMLText, @Start, @Length, '') SET @Start = CHARINDEX('<STYLE', @HTMLText) SET @End = CHARINDEX('</STYLE>', @HTMLText, CHARINDEX('</STYLE>', @HTMLText)) + 7 SET @Length = (@End - @Start) + 1 END -- Remove anything between <whatever> tags SET @Start = CHARINDEX('<', @HTMLText) SET @End = CHARINDEX('>', @HTMLText, CHARINDEX('<', @HTMLText)) SET @Length = (@End - @Start) + 1 WHILE (@Start > 0 AND @End > 0 AND @Length > 0) BEGIN SET @HTMLText = STUFF(@HTMLText, @Start, @Length, '') SET @Start = CHARINDEX('<', @HTMLText) SET @End = CHARINDEX('>', @HTMLText, CHARINDEX('<', @HTMLText)) SET @Length = (@End - @Start) + 1 END RETURN LTRIM(RTRIM(@HTMLText)) END
尝试这个。 它是由RedFilter发布的修改版本…此SQL删除除BR，B和P以外的所有附加属性的标签：
CREATE FUNCTION [dbo].[StripHtml] (@HTMLText VARCHAR(MAX)) RETURNS VARCHAR(MAX) AS BEGIN DECLARE @Start INT DECLARE @End INT DECLARE @Length INT DECLARE @TempStr varchar(255) SET @Start = CHARINDEX('<',@HTMLText) SET @End = CHARINDEX('>',@HTMLText,CHARINDEX('<',@HTMLText)) SET @Length = (@End - @Start) + 1 WHILE @Start > 0 AND @End > 0 AND @Length > 0 BEGIN IF (UPPER(SUBSTRING(@HTMLText, @Start, 3)) <> '<BR') AND (UPPER(SUBSTRING(@HTMLText, @Start, 2)) <> '<P') AND (UPPER(SUBSTRING(@HTMLText, @Start, 2)) <> '<B') AND (UPPER(SUBSTRING(@HTMLText, @Start, 3)) <> '</B') BEGIN SET @HTMLText = STUFF(@HTMLText,@Start,@Length,'') END SET @Start = CHARINDEX('<',@HTMLText, @End) SET @End = CHARINDEX('>',@HTMLText,CHARINDEX('<',@HTMLText, @Start)) SET @Length = (@End - @Start) - 1 END RETURN RTRIM(LTRIM(@HTMLText)) END
下面是这个函数的更新版本，它将RedFilter的答案（Pinal的原始版本）和LazyCoders添加以及goodeye的input错误更正和我自己的补充结合在一起处理HTML内部的<STYLE>标签。
ALTER FUNCTION [dbo].[udf_StripHTML] ( @HTMLText varchar(MAX) ) RETURNS varchar(MAX) AS BEGIN DECLARE @Start int DECLARE @End int DECLARE @Length int -- Replace the HTML entity & with the '&' character (this needs to be done first, as -- '&' might be double encoded as '&amp;') SET @Start = CHARINDEX('&', @HTMLText) SET @End = @Start + 4 SET @Length = (@End - @Start) + 1 WHILE (@Start > 0 AND @End > 0 AND @Length > 0) BEGIN SET @HTMLText = STUFF(@HTMLText, @Start, @Length, '&') SET @Start = CHARINDEX('&', @HTMLText) SET @End = @Start + 4 SET @Length = (@End - @Start) + 1 END -- Replace the HTML entity < with the '<' character SET @Start = CHARINDEX('<', @HTMLText) SET @End = @Start + 3 SET @Length = (@End - @Start) + 1 WHILE (@Start > 0 AND @End > 0 AND @Length > 0) BEGIN SET @HTMLText = STUFF(@HTMLText, @Start, @Length, '<') SET @Start = CHARINDEX('<', @HTMLText) SET @End = @Start + 3 SET @Length = (@End - @Start) + 1 END -- Replace the HTML entity > with the '>' character SET @Start = CHARINDEX('>', @HTMLText) SET @End = @Start + 3 SET @Length = (@End - @Start) + 1 WHILE (@Start > 0 AND @End > 0 AND @Length > 0) BEGIN SET @HTMLText = STUFF(@HTMLText, @Start, @Length, '>') SET @Start = CHARINDEX('>', @HTMLText) SET @End = @Start + 3 SET @Length = (@End - @Start) + 1 END -- Replace the HTML entity & with the '&' character SET @Start = CHARINDEX('&amp;', @HTMLText) SET @End = @Start + 4 SET @Length = (@End - @Start) + 1 WHILE (@Start > 0 AND @End > 0 AND @Length > 0) BEGIN SET @HTMLText = STUFF(@HTMLText, @Start, @Length, '&') SET @Start = CHARINDEX('&amp;', @HTMLText) SET @End = @Start + 4 SET @Length = (@End - @Start) + 1 END -- Replace the HTML entity with the ' ' character SET @Start = CHARINDEX(' ', @HTMLText) SET @End = @Start + 5 SET @Length = (@End - @Start) + 1 WHILE (@Start > 0 AND @End > 0 AND @Length > 0) BEGIN SET @HTMLText = STUFF(@HTMLText, @Start, @Length, ' ') SET @Start = CHARINDEX(' ', @HTMLText) SET @End = @Start + 5 SET @Length = (@End - @Start) + 1 END -- Replace any <br> tags with a newline SET @Start = CHARINDEX('<br>', @HTMLText) SET @End = @Start + 3 SET @Length = (@End - @Start) + 1 WHILE (@Start > 0 AND @End > 0 AND @Length > 0) BEGIN SET @HTMLText = STUFF(@HTMLText, @Start, @Length, CHAR(13) + CHAR(10)) SET @Start = CHARINDEX('<br>', @HTMLText) SET @End = @Start + 3 SET @Length = (@End - @Start) + 1 END -- Replace any <br/> tags with a newline SET @Start = CHARINDEX('<br/>', @HTMLText) SET @End = @Start + 4 SET @Length = (@End - @Start) + 1 WHILE (@Start > 0 AND @End > 0 AND @Length > 0) BEGIN SET @HTMLText = STUFF(@HTMLText, @Start, @Length, CHAR(13) + CHAR(10)) SET @Start = CHARINDEX('<br/>', @HTMLText) SET @End = @Start + 4 SET @Length = (@End - @Start) + 1 END -- Replace any <br /> tags with a newline SET @Start = CHARINDEX('<br />', @HTMLText) SET @End = @Start + 5 SET @Length = (@End - @Start) + 1 WHILE (@Start > 0 AND @End > 0 AND @Length > 0) BEGIN SET @HTMLText = STUFF(@HTMLText, @Start, @Length, CHAR(13) + CHAR(10)) SET @Start = CHARINDEX('<br />', @HTMLText) SET @End = @Start + 5 SET @Length = (@End - @Start) + 1 END -- Remove anything between <STYLE> tags SET @Start = CHARINDEX('<STYLE', @HTMLText) SET @End = CHARINDEX('</STYLE>', @HTMLText, CHARINDEX('<', @HTMLText)) + 7 SET @Length = (@End - @Start) + 1 WHILE (@Start > 0 AND @End > 0 AND @Length > 0) BEGIN SET @HTMLText = STUFF(@HTMLText, @Start, @Length, '') SET @Start = CHARINDEX('<STYLE', @HTMLText) SET @End = CHARINDEX('</STYLE>', @HTMLText, CHARINDEX('</STYLE>', @HTMLText)) + 7 SET @Length = (@End - @Start) + 1 END -- Remove anything between <whatever> tags SET @Start = CHARINDEX('<', @HTMLText) SET @End = CHARINDEX('>', @HTMLText, CHARINDEX('<', @HTMLText)) SET @Length = (@End - @Start) + 1 WHILE (@Start > 0 AND @End > 0 AND @Length > 0) BEGIN SET @HTMLText = STUFF(@HTMLText, @Start, @Length, '') SET @Start = CHARINDEX('<', @HTMLText) SET @End = CHARINDEX('>', @HTMLText, CHARINDEX('<', @HTMLText)) SET @Length = (@End - @Start) + 1 END RETURN LTRIM(RTRIM(@HTMLText)) END
如何使用XQuery一个class轮：
select @xml.query('for $x in //. return ($x)//text()')
这遍历所有元素并仅返回text（）。
要避免元素之间的连接而不使用空格的文本，请使用：
SELECT @xml.query('for $x in //. return concat((($x)//text())[1]," ")')
这些非常适合当你想build立seach短语，剥离HTML等
只要注意，这返回typesxml，所以CAST或COVERT在适当的文本。 这种数据types的xml版本是无用的，因为它不是一个合适的XML。
