我可以在 t-sql 中进行查找/替换吗？
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Can I do a find/replace in t-sql?
提问by Joel Martinez
I basically have an xml column, and I need to find and replace one tag value in each record.
我基本上有一个 xml 列，我需要在每条记录中查找并替换一个标记值。
回答by Cory Mawhorter
For anything real, I'd go with xpaths, but sometimes you just need a quick and dirty solution:
对于任何真实的事情，我会使用 xpaths，但有时您只需要一个快速而肮脏的解决方案：
You can use CAST to turn that xml column into a regular varchar, and then do your normal replace.
您可以使用 CAST 将该 xml 列转换为常规 varchar，然后进行正常替换。
UPDATE xmlTable SET xmlCol = REPLACE( CAST( xmlCol as varchar(max) ), '[search]', '[replace]')
UPDATE xmlTable SET xmlCol = REPLACE( CAST( xmlCol as varchar(max) ), '[search]', '[replace]')
That same technique also makes searching XML a snap when you need to just run a quick query to find something, and don't want to deal with xpaths.
当您只需要运行快速查询来查找某些内容，而不想处理 xpath 时，同样的技术也使搜索 XML 变得轻而易举。
SELECT * FROM xmlTable WHERE CAST( xmlCol as varchar(max) ) LIKE '%found it!%'
SELECT * FROM xmlTable WHERE CAST( xmlCol as varchar(max) ) LIKE '%found it!%'
Edit: Just want to update this a bit, if you get a message along the lines of Conversion of one or more characters from XML to target collation impossible, then you only need to use nvarchar which supports unicode.
编辑：只是想稍微更新一下，如果您收到一条类似于将一个或多个字符从 XML 转换为不可能的目标排序规则的消息，那么您只需要使用支持 unicode 的 nvarchar。
CAST( xmlCol as nvarchar(max) )
CAST( xmlCol as nvarchar(max) )
回答by Michael Petrotta
To find a content in an XML column, look into the exist() method, as described in MSDN here.
要在 XML 列中查找内容，请查看exist() 方法，如 MSDN此处 中所述。
SELECT * FROM Table
WHERE XMLColumn.exist('/Root/MyElement') = 1
...to replace, use the modify() method, as described here.
...更换，使用修改（）方法，如描述在这里。
SET XMLColumn.modify('
replace value of (/Root/MyElement/text())[1]
with "new value"
')
..all assuming SqlServer 2005 or 2008. This is based on XPath, which you'll need to know.
..所有假设 SqlServer 2005 或 2008。这是基于 XPath，你需要知道。
回答by Avdi
update my_table
set xml_column = replace(xml_column, "old value", "new value")
