[英]parsing XML with TSQL - value() with nested nodes issue
我正在使用TSQL解析xml文件以構建一個表以供進一步分析。 使用來自xquery-lab-61-writing-a-recursive-cte-to-process-an-xml-document的很好的建議我使用CTE但沒有獲得所需的結果。 問題在於帶有子節點的節點的value()函數。
我有
DECLARE @x XML
SELECT @x = '
<books>
<book id="101">
<title>my book</title>
<author>Myself</author>
</book>
<book id="202">
text before
<title>your book</title>
in the middle
<author>you</author>
text after
</book>
</books>'
;WITH cte AS (
SELECT
1 AS lvl,
x.value('local-name(.)','VARCHAR(MAX)') AS FullPath,
x.value('text()[1]','VARCHAR(MAX)') AS Value,
x.query('.') AS CurrentNode,
CAST(CAST(1 AS VARBINARY(4)) AS VARBINARY(MAX)) AS Sort
FROM @x.nodes('/*') a(x)
UNION ALL
SELECT
p.lvl + 1 AS lvl,
CAST(
p.FullPath
+ '/'
+ c.value('local-name(.)','VARCHAR(MAX)') AS VARCHAR(MAX)
) AS FullPath,
CAST( c.value('text()[1]','VARCHAR(MAX)') AS VARCHAR(MAX) ) AS Value,
c.query('.') AS CurrentNode,
CAST(
p.Sort
+ CAST( (lvl + 1) * 1024
+ (ROW_NUMBER() OVER(ORDER BY (SELECT 1)) * 2) AS VARBINARY(4)
) AS VARBINARY(MAX) ) AS Sort
FROM cte p
CROSS APPLY CurrentNode.nodes('/*/*') b(c)
), cte2 AS (
SELECT
FullPath,
Value,
Sort
FROM cte
UNION ALL
SELECT
p.FullPath + '/@' + x.value('local-name(.)','VARCHAR(MAX)'),
x.value('.','VARCHAR(MAX)'),
Sort
FROM cte p
CROSS APPLY CurrentNode.nodes('/*/@*') a(x)
)
SELECT FullPath, value
FROM cte2
WHERE Value IS NOT NULL
ORDER BY Sort
結果
FullPath Value
-------------------- ------------------------------
books\book\@id 101
books\book\title my book
books\book\author Myself
books\book text before
books\book\@id 202
books\book\title your book
books\book\author you
我需要這樣的東西:
FullPath Value
-------------------- ------------------------------
books\book\@id 101
books\book\title my book
books\book\author Myself
books\book text before
books\book\@id 202
books\book\title your book
books\book in the middle
books\book\author you
books\book text after
如果可能的話,我寧願找到使用TSQL的解決方案。 我將非常感謝任何好的解決方案/建議。
使用OPENXML而不是使用XML數據類型更容易完成。
使用OPENXML,您可以創建一個邊表,該表對於XML中的每個節點都有一行。
declare @idoc int;
exec sp_xml_preparedocument @idoc out, @x;
select *
from openxml(@idoc, '')
exec sp_xml_removedocument @idoc;
結果:
id parentid nodetype localname prefix namespaceuri datatype prev text
--- ----------------- --------- ------ ------------ -------- ---- -------------
0 NULL 1 books NULL NULL NULL NULL NULL
2 0 1 book NULL NULL NULL NULL NULL
3 2 2 id NULL NULL NULL NULL NULL
13 3 3 #text NULL NULL NULL NULL 101
4 2 1 title NULL NULL NULL NULL NULL
14 4 3 #text NULL NULL NULL NULL my book
5 2 1 author NULL NULL NULL 4 NULL
15 5 3 #text NULL NULL NULL NULL Myself
6 0 1 book NULL NULL NULL 2 NULL
7 6 2 id NULL NULL NULL NULL NULL
16 7 3 #text NULL NULL NULL NULL 202
8 6 3 #text NULL NULL NULL NULL text before
9 6 1 title NULL NULL NULL 8 NULL
17 9 3 #text NULL NULL NULL NULL your book
10 6 3 #text NULL NULL NULL 9 in the middle
11 6 1 author NULL NULL NULL 10 NULL
18 11 3 #text NULL NULL NULL NULL you
12 6 3 #text NULL NULL NULL 11 text after
將邊表存儲在臨時表中,並使用id
和parentid
執行遞歸CTE。 在構建FullPath
列時使用nodetype
。
declare @x xml;
select @x = '
<books>
<book id="101">
<title>my book</title>
<author>Myself</author>
</book>
<book id="202">
text before
<title>your book</title>
in the middle
<author>you</author>
text after
</book>
</books>';
declare @idoc int;
exec sp_xml_preparedocument @idoc out, @x;
select *
into #T
from openxml(@idoc, '');
exec sp_xml_removedocument @idoc;
with C as
(
select T.id,
T.parentid,
T.localname as FullPath,
T.text as Value
from #T as T
where T.parentid is null
union all
select T.id,
T.parentid,
C.FullPath + case T.nodetype
when 1 then N'\' + T.localname -- Element node
when 2 then N'\@' + T.localname -- Attribute node
when 3 then N'' -- Text node
when 4 then N'' -- CDATA secotion node
when 5 then N'' -- Entity reference node
when 6 then N'' -- Entity node
when 7 then N'' -- Processing instrution node
when 8 then N'' -- Comment node
when 9 then N'' -- Document node
when 10 then N'' -- Document type node
when 11 then N'' -- Document fragment node
when 12 then N'' -- Notation node
end,
T.text
from C
inner join #T as T
on C.id = T.parentid
)
select C.FullPath,
C.Value
from C
where C.Value is not null
order by C.parentid,
C.id;
drop table #T;
結果:
FullPath Value
------------------ --------------
books\book\@id 101
books\book\title my book
books\book\author Myself
books\book text before
books\book in the middle
books\book text after
books\book\@id 202
books\book\title your book
books\book\author you
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