I have the following table
name | age | misc
------------------
david | 20 | foo
john | 30 | bar
And I want to transform it into the following XML:
<doc>
<field name="name" val="david" />
<field name="age" val="20" />
<field name="misc" val="foo" />
</doc>
<doc>
<field name="name" val="john" />
<field name="age" val="30" />
<field name="misc" val="bar" />
</doc>
I have for this working below for a single column, however if I try to add a second column for another field
node I get the error:
Msg 9303, Level 16, State 1, Line 25
XQuery [query()]: Syntax error near 'name', expected '}'.
This is a sample of what I am trying to do and is ready to run in SQL Server Management Studio. I can't find much documentation on the syntax and am quite lost for ideas.
Any assistance is appreciated!
declare @MyData table (name varchar(200), age varchar(200), misc varchar(200))
insert into @MyData values('david', '20', 'foo')
insert into @MyData values('john', '30', 'bar')
/*This one works fine*/
SELECT (select * from @MyData as MyData for xml auto, type).query
(
' for $d in /MyData
return
<doc>{
<field name="name" val="{data($d/@name)}" />
}</doc>'
)
/*This one is what I want*/
SELECT (select * fr开发者_Go百科om @MyData as MyData for xml auto, type).query
(
' for $d in /MyData
return
<doc>{
<field name="name" val="{data($d/@name)}" />
<field name="age" val="{data($d/@age)}" />
<field name="misc" val="{data($d/@misc)}" />
}</doc>'
)
How about this..
select
(select 'name' as 'field/@name', a.name as 'field/@val' for xml path(''), type),
(select 'age' as 'field/@name', a.age as 'field/@val' for xml path(''), type),
(select 'misc' as 'field/@name', a.misc as 'field/@val' for xml path(''), type)
from
MyData a for xml path('doc')
for your XQuery version try this: (I just removed the curly braces) Is that OK?
SELECT (select * from @MyData as MyData for xml auto, type).query
(
' for $d in /MyData
return
<doc>
<field name="name" val="{data($d/@name)}" />
<field name="age" val="{data($d/@age)}" />
<field name="misc" val="{data($d/@misc)}" />
</doc>'
)
You're essentially trying to get XML for the unpivoted data. So, start by getting a unique row identifier that isn't a field (I'll use a CTE and row_number). From there, you can use UNPIVOT and FOR XML EXPLICIT:
;with data as (
select name, age, misc,
row_number() over(order by name) as 'row'
from @MyData
)
select 1 as tag,
null as parent,
row as [doc!1!row!hide],
null as [field!2!name],
null as [field!2!val]
from data
UNION
select 2 as tag,
1 as parent,
row as [doc!1!row!hide],
fieldName as [field!2!name],
val as [field!2!val]
from data d
UNPIVOT(val for fieldName in (name, age, misc)) up
order by row, tag
FOR XML EXPLICIT, ROOT('root')
the ROOT('root')
is to add a simple root element and is in addition to the requested xml format, but I thought it might be useful.
UPDATE
After looking a bit closer at query execution plans, you might be better off simply creating formatted text then casting to xml:
select cast('<field name="name" val="'+name+'" />'+
'<field name="age" val="'+age+'" />'+
'<field name="misc" val="'+misc+'" />'
as xml)
from @MyData
for xml path('doc')
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