Question

我必须提取RSS feed中编写的文章的作者，问题是一个RSS的作者名称属性列为 dc：creator ，另一个作为作者（下面的代码）。关于我如何使我的查询动态两种情况的任何方式？

查询：

CREATE PROCEDURE feed.usp_importXML(@file VARCHAR(8000))
AS
    BEGIN
        DECLARE @Query VARCHAR(8000)

        SET @Query ='
            DECLARE @xmlFile as XML
            SET @xmlFile =(SELECT CONVERT(XML,BulkColumn) as BulkColumn
            FROM OPENROWSET (BULK  '''+@file+''', SINGLE_BLOB) AS t)
            INSERT INTO feed.tempXML (source, title,link,author,[date])
            SELECT
            source = t.value (''../link[1]'', ''NVARCHAR(300)''),
                title = t.value (''title[1]'', ''NVARCHAR(300)''),
                link = t.value (''./link[1]'', ''NVARCHAR(300)''),
                author = t.value(''(*:creator)[1]'',''NVARCHAR(50)''),
                [date] = t.value(''pubDate[1]'',''NVARCHAR(50)'')
            FROM @xmlFile.nodes(''/rss/channel/item'') AS xTable(t);'

            EXEC(@Query)
    END
GO

RSS 1：

<item>
                    <guid isPermaLink="false">http://www.espnfc.com/story/3154621/wojciech-szczesny-completes-transfer-to-juventus-from-arsenal3154621</guid>
                    <title><![CDATA[Wojciech Szczesny completes transfer to Juventus from Arsenal]]></title>

                    <description>
                        &lt;img style=&quot;float: left; margin-right: 10px;&quot; src=&quot;http://a.espncdn.com/combiner/i/?img=/photo/2016/1002/r134626_1296x729_16-9.jpg&amp;amp;w=100&amp;amp;h=80&amp;amp;scale=crop&amp;amp;site=espnfc&quot; /&gt;<![CDATA[Douglas Costa hopes to evolve as a player with Juventus and gain recognition for Brazil&apos;s World Cup squad next year. 
Juventus have completed the signing of Wojciech Szczesny from Arsenal for a fee of &amp;#8364;12.2 million.
Poland goalkeeper Szczesny underwent his medical in Turin on Tuesday and officially became a Juventus player on Wednesday in a deal that could rise to &amp;#8364;15.3 million, depending on performance.
The 27-year-old, who spent the last two seasons on loan at Roma, has signed a four-year contract for the Bianconeri, where he is expected to be understudy to Italy No. 1 Gianlugi Buffon in the coming...]]>
                    </description>

                    <link>http://www.espnfc.com/story/3154621/wojciech-szczesny-completes-transfer-to-juventus-from-arsenal</link>
                    <pubDate>Wed, 19 Jul 2017 06:19:00 PDT</pubDate>

                    <enclosure length="150" url="http://a.espncdn.com/combiner/i/?img=/photo/2016/1002/r134626_1296x729_16-9.jpg&amp;amp;w=100&amp;amp;h=80&amp;amp;scale=crop&amp;amp;site=espnfc" type="image/jpeg" />

                    <category>Story</category>

                    <category><![CDATA[Transfers]]></category>

                    <category><![CDATA[Juventus]]></category>

                    <category><![CDATA[Arsenal]]></category>

                    <category><![CDATA[Wojciech Szczesny]]></category>

                    <category><![CDATA[English Premier League]]></category>

                    <category><![CDATA[Italian Serie A]]></category>

                    <dc:creator>Ben Gladwell</dc:creator>
                </item>

RSS 2：

-<item>

<title>Sampdoria Striker Patrick Schick Could Be Set to Join Inter After Collapse of Juventus Deal</title>

<link>http://www.90min.com/posts/5285895-sampdoria-striker-patrick-schick-could-be-set-to-join-inter-after-collapse-of-juventus-deal?utm_source=RSS</link>

<author>Callum Rice-Coates</author>

<guid isPermaLink="false">d5a2ba8b504a22fcdb405ec687f91956</guid>

<description>Sampdoria striker Patrick Schick could be on the verge of a move to Inter after a proposed deal to join Juventus fell through. Ginaluca Di Marzio has reported that the Czech forward's representatives have met with the Inter hierarchy to discuss the details of the potential transfer. According to the Italian journalist, Schick, who found the net 11 times in 32 Serie A appearances last season, 'could soon enjoy a new experience at Inter.' #Calciomercato | #Inter, incontro in corso con la...</description>

<media:thumbnail type="image/jpg" url="https://images0.minutemediacdn.com/production/912x516/596f80ed6bd5c5594b000001.jpg?main_image=true&imageType=.jpg"/>

<pubDate>Wed, 19 Jul 2017 19:43:56 +0000</pubDate>

</item>

Answer 1

您可以使用谓词调用local-name()来实现这一点：

提示

你减少了XML，这很好，但是那些不完全有效的剩余部分必须纠正一些事情（缺少命名空间）...
查看第二个Feed中的URL 。 &标志应该让你陷入困境......

declare @mockup TABLE(ID INT IDENTITY, YourXML XML);
INSERT INTO @mockup VALUES
(N'<item xmlns:dc="dummy">
                    <guid isPermaLink="false">http://www.espnfc.com/story/3154621/wojciech-szczesny-completes-transfer-to-juventus-from-arsenal3154621</guid>
                    <title><![CDATA[Wojciech Szczesny completes transfer to Juventus from Arsenal]]></title>

                    <description>
                        &lt;img style=&quot;float: left; margin-right: 10px;&quot; src=&quot;http://a.espncdn.com/combiner/i/?img=/photo/2016/1002/r134626_1296x729_16-9.jpg&amp;amp;w=100&amp;amp;h=80&amp;amp;scale=crop&amp;amp;site=espnfc&quot; /&gt;<![CDATA[Douglas Costa hopes to evolve as a player with Juventus and gain recognition for Brazil&apos;s World Cup squad next year. 
Juventus have completed the signing of Wojciech Szczesny from Arsenal for a fee of &amp;#8364;12.2 million.
Poland goalkeeper Szczesny underwent his medical in Turin on Tuesday and officially became a Juventus player on Wednesday in a deal that could rise to &amp;#8364;15.3 million, depending on performance.
The 27-year-old, who spent the last two seasons on loan at Roma, has signed a four-year contract for the Bianconeri, where he is expected to be understudy to Italy No. 1 Gianlugi Buffon in the coming...]]>
                    </description>

                    <link>http://www.espnfc.com/story/3154621/wojciech-szczesny-completes-transfer-to-juventus-from-arsenal</link>
                    <pubDate>Wed, 19 Jul 2017 06:19:00 PDT</pubDate>

                    <enclosure length="150" url="http://a.espncdn.com/combiner/i/?img=/photo/2016/1002/r134626_1296x729_16-9.jpg&amp;amp;w=100&amp;amp;h=80&amp;amp;scale=crop&amp;amp;site=espnfc" type="image/jpeg" />

                    <category>Story</category>

                    <category><![CDATA[Transfers]]></category>

                    <category><![CDATA[Juventus]]></category>

                    <category><![CDATA[Arsenal]]></category>

                    <category><![CDATA[Wojciech Szczesny]]></category>

                    <category><![CDATA[English Premier League]]></category>

                    <category><![CDATA[Italian Serie A]]></category>

                    <dc:creator>Ben Gladwell</dc:creator>
                </item>')
,(N'<item xmlns:media="dummy">

<title>Sampdoria Striker Patrick Schick Could Be Set to Join Inter After Collapse of Juventus Deal</title>

<link>http://www.90min.com/posts/5285895-sampdoria-striker-patrick-schick-could-be-set-to-join-inter-after-collapse-of-juventus-deal?utm_source=RSS</link>

<author>Callum Rice-Coates</author>

<guid isPermaLink="false">d5a2ba8b504a22fcdb405ec687f91956</guid>
<description>Sampdoria striker Patrick Schick could be on the verge of a move to Inter after a proposed deal to join Juventus fell through. Ginaluca Di Marzio has reported that the Czech forward''s representatives have met with the Inter hierarchy to discuss the details of the potential transfer. According to the Italian journalist, Schick, who found the net 11 times in 32 Serie A appearances last season, ''could soon enjoy a new experience at Inter.'' #Calciomercato | #Inter, incontro in corso con la...</description>


<media:thumbnail type="image/jpg" />

<pubDate>Wed, 19 Jul 2017 19:43:56 +0000</pubDate>

</item>');

这是您的查询：

SELECT itm.value(N'(link/text())[1]','nvarchar(max)') AS link
      ,itm.value(N'(title/text())[1]','nvarchar(max)') AS title
      ,itm.value(N'(*[local-name()="creator" or local-name()="author"]/text())[1]','nvarchar(max)') AS author
FROM @mockup AS m
CROSS APPLY m.YourXML.nodes(N'/item') AS A(itm)

Answer 2

不是将BulkColumn直接转换为XML，而是首先将其转换为NVARCHAR(MAX)。

然后在该字符串上使用REPLACE函数来查找<dc:creator> <author>并将</dc:creator>替换为</author>

将新字符串转换为XML并使用 author 属性

继续使用SELECT FROM XML

代码段：

 SET @Query ='
            DECLARE @xmlFile as XML
            DECLARE @xmlString NVARCHAR(MAX);
            SET @xmlString =(SELECT CONVERT(NVARCHAR(MAX),BulkColumn) as BulkColumn
            FROM OPENROWSET (BULK  '''+@file+''', SINGLE_BLOB) AS t);

            SET @xmlString = REPLACE(@xmlString, ''<dc:creator>'', ''<author>'')
            SET @xmlString = REPLACE(@xmlString, ''</dc:creator>'', ''</author>'')
            SELECT @xmlFile = CONVERT(XML,  @xmlString);

            INSERT INTO feed.tempXML (source, title,link,author,[date])
            SELECT
            source = t.value (''../link[1]'', ''NVARCHAR(300)''),
                title = t.value (''title[1]'', ''NVARCHAR(300)''),
                link = t.value (''./link[1]'', ''NVARCHAR(300)''),
                author = t.value(''author[1]'',''NVARCHAR(50)''),
                [date] = t.value(''pubDate[1]'',''NVARCHAR(50)'')
            FROM @xmlFile.nodes(''/rss/channel/item'') AS xTable(t);'

Answer 3

使用来自@ Shnugo建议的一行代码，我已经通过替换这部分代码解决了这个问题：

author = t.value(''author[1]'',''NVARCHAR(50)'')

有了这部分：

author = t.value(N''(*[local-name()="creator" or local-name()="author"]/text())[1]'',''NVARCHAR(50)'')

所以现在查询看起来像这样：

SET @Query ='
            DECLARE @xmlFile as XML
            SET @xmlFile =(SELECT CONVERT(XML,BulkColumn) as BulkColumn
            FROM OPENROWSET (BULK  '''+@file+''', SINGLE_BLOB) AS t)
            INSERT INTO feed.tempXML (source, title,link,author,[date])
            SELECT 
                source = t.value (''../link[1]'', ''NVARCHAR(300)''),
                title = t.value (''title[1]'', ''NVARCHAR(300)''),
                link = t.value (''./link[1]'', ''NVARCHAR(300)''),
                author = t.value(N''(*[local-name()="creator" or local-name()="author"]/text())[1]'',''NVARCHAR(50)''),
                [date] = t.value(''pubDate[1]'',''NVARCHAR(50)'')
            FROM @xmlFile.nodes(''/rss/channel/item'') AS xTable(t);'

从不同的RSS源格式获取属性

3 个答案:

提示