Question

我正在使用TSQL解析xml文件以构建表以供进一步分析。使用来自xquery-lab-61-writing-a-recursive-cte-to-process-an-xml-document的很好的建议我使用CTE但没有得到期望的结果。问题在于带有子节点的节点的value（）函数。

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

导致

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

我需要这样的东西：

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，我更愿意使用TSQL找到解决方案。我将非常感谢任何好的解决方案/建议。

Answer 1

使用OPENXML而不是使用XML数据类型更容易完成。

使用OPENXML，您可以创建一个边表，其中XML中的每个节点都有一行。

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

结果：

id

将边缘表存储在临时表中，并使用parentid和nodetype执行递归CTE。在构建FullPath列时使用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;。

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

结果：

function color_switch($number){

        switch (true){
        case $number == range(1 , 3):
            $color =  "progress-bar-danger";
            break;
        case $number == range(3 , 5):
            $color =  "progress-bar-warning";
            break;
        case $number == range(5 , 6):
            $color =  "progress-bar-default";
            break;  
        case $number == range(6 , 8):
            $color =  "progress-bar-success";
            break;  
        case $number == range(8, 10):
            $color =  "progress-bar-success";
            break;  
    }
    return $color;
}

SQL Fiddle

使用TSQL解析XML - 带有嵌套节点问题的value（）问题

1 个答案: