问题
Is it possible to store non-alphanumeric characters (more specifically line break characters) in a XML data type?
The code below illustrates my problem:
declare @a xml
declare @b nvarchar(max)
set @b = '<Entry Attrib="1'+CHAR(13)+'2" />'
print @b
set @a=convert(xml,@b,1)
set @b=convert(nvarchar, @a,1)
print @b
The output is:
<Entry Attrib="1
2" />
<Entry Attrib="1 2"/>
Is there any way I could keep the line break intact?
My actual problem is to store the value in a table (rather than a local variable), so maybe there's some setting for the corresponding XML column in my table that would do the job?
回答1:
It would not be possible. The XML Data type is stored as an XML DOM Tree, not a string.
You would have to store it as a varchar instead if you want to keep whitespace.
回答2:
My answer in the XSLT context should apply here:
XML parsed entities are often stored in computer files which, for editing convenience, are organized into lines. These lines are typically separated by some combination of the characters carriage-return (#xD) and line-feed (#xA).
So this might be what you are looking for:
set @b = '<Entry Attrib="1
2" />'
回答3:
White space inside of an XML tag is not considered significant according to the XML specification, and will not be preserved. White space outside of the element will however:
declare @a xml
declare @b nvarchar(max)
set @b = '<Entry Attrib="12"> fo'+CHAR(13)+'o</Entry>'
print @b
set @a=convert(xml,@b,1)
set @b=convert(nvarchar(max), @a,1)
print @b
will output:
<Entry Attrib="12"> fo
o</Entry>
<Entry Attrib="12"> fo
o</Entry>
来源：https://stackoverflow.com/questions/1522005/sql-server-storing-linebreaks-in-xml-data-type