如何在 SQL Server 2019 中生成 XML 站点地图？

Question

我想从 SQL Server 中生成站点地图，并使用以下产品表将其保存到我的系统驱动器：

样本数据

loc	image	caption	changefreq	priority
https://example.com/product1	https://example.com/asset/img1.jpg	title1	10	0.1
https://example.com/product2	https://example.com/asset/img2.jpg	title2	5	0

我尝试使用 FOR XML PATH 查询，但它没有给我正确的结果：

DECLARE @xml XML = (SELECT 
                        (SELECT 
                                '' AS "data()" 
                         FOR XML PATH ('loc'), TYPE),
                         (SELECT 
                                '' AS "data()" 
                         FOR XML PATH ('changefreq'), TYPE),
                         (SELECT 
                                '' AS "data()" 
                         FOR XML PATH ('priority'), TYPE),
                         
                                '' AS 'Name!1!ELEMENT' 
                    FROM dbo.product o 
                    FOR XML PATH ('url'), ROOT('dummyTag'), TYPE)

-- Magic happens here!       

    SELECT 1 AS Tag
          ,0 AS Parent
          ,@xml AS [urlset!1!!xmltext]
          ,'http://www.sitemaps.org/schemas/sitemap/0.9' AS [urlset!1!xmlns]
          ,'http://www.sitemaps.org/schemas/sitemap/0.9' AS [urlset!1!xmlns:image]
    FOR XML EXPLICIT

---

模板 xml：

<urlset xmlns:image="http://www.google.com/schemas/sitemap-image/1.1" xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
  <url>
    <loc></loc>
    <changefreq></changefreq>
    <image:image>
      <image:loc></image:loc>
      <image:caption></image:caption>
    </image:image>
  </url>
</urlset>

我想要的是这样的结果：

<?xml version="1.0" encoding="UTF-8"?>
<urlset
    xmlns="http://www.sitemaps.org/schemas/sitemap/0.9"
    xmlns:image="http://www.google.com/schemas/sitemap-image/1.1">
    <url>
        <loc>https://www.example.com/product/dkp-4658551/%D9%85%D8%A7%D9%86%D8%AA%D9%88-%D8%B2%D9%86%D8%A7%D9%86%D9%87-27-%D9%85%D8%AF%D9%84-%DA%AF%D9%84-%D9%88-%D9%BE%D9%86%D8%AC%D8%B1%D9%87-%DA%A9%D8%AF-v78-%D8%B1%D9%86%DA%AF-%D8%B7%D9%88%D8%B3%DB%8C</loc>
        <changefreq>weekly</changefreq>
        <priority>0.8</priority>
        <image:image>
            <image:loc>https://example.com/mysite-products/3d1201f33f4e6dd6114ee6ec55be20fb5581f382_1615206830.jpg?x-oss-process=image/resize,m_lfit,h_350,w_350/quality,q_60</image:loc>
            <image:caption>مانتو زنانه 27 مدل گل و پنجره کد V78 رنگ طوسی</image:caption>
        </image:image>
    </url>
</urlset>

Answer 1

由于没有提供 DDL 和样本数据总体，我冒昧地创建了它。

通过使用 XQuery 及其 FLWOR 表达式，可以轻松创建站点地图 XML。

SQL

-- DDL and sample data population, start
DECLARE @tbl TABLE 
(
    ID INT IDENTITY PRIMARY KEY, 
    loc VARCHAR(2048), 
    changefreq VARCHAR(10),
    priority DECIMAL(2,1),
    image VARCHAR(2048),
    caption NVARCHAR(255)
);
INSERT INTO @tbl (loc, changefreq, priority, image, caption) VALUES
('https://example.com/product1', 'hourly', 0.5, 'https://example.com/asset/img1.jpg', N'caption1'),
('https://example.com/product2', 'daily', 0.2, 'https://example.com/asset/img2.jpg', N'caption2');
-- DDL and sample data population, end

;WITH XMLNAMESPACES(DEFAULT 'http://www.sitemaps.org/schemas/sitemap/0.9'
    , 'http://www.google.com/schemas/sitemap-image/1.1' AS [image])
SELECT (
    SELECT * 
    FROM @tbl
    FOR XML PATH('r'), TYPE, ROOT('root')
).query('<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9"
        xmlns:image="http://www.google.com/schemas/sitemap-image/1.1">
{
    for $x in /root/r
    return <url>
        <loc>{data($x/loc)}</loc>
        <changefreq>{data($x/changefreq)}</changefreq>
        <priority>{data($x/priority)}</priority>
        <image:image>
            <image:loc>{data($x/image)}</image:loc>
            <image:caption>{data($x/caption)}</image:caption>
        </image:image>
    </url>
}
</urlset>');

输出

<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9" xmlns:image="http://www.google.com/schemas/sitemap-image/1.1">
  <url>
    <loc>https://example.com/product1</loc>
    <changefreq>hourly</changefreq>
    <priority>0.5</priority>
    <image:image>
      <image:loc>https://example.com/asset/img1.jpg</image:loc>
      <image:caption>caption1</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://example.com/product2</loc>
    <changefreq>daily</changefreq>
    <priority>0.2</priority>
    <image:image>
      <image:loc>https://example.com/asset/img2.jpg</image:loc>
      <image:caption>caption2</image:caption>
    </image:image>
  </url>
</urlset>

Answer 2

以下内容还返回您需要的内容 - 对我来说似乎更简单。此外，如果您想添加版本和编码，我相信您可以做到的唯一方法是转换为字符串。

DECLARE @Xml XML = null, @XMLStr NVARCHAR(MAX) = '<?xml version="1.0" encoding="UTF-8"?>';

WITH XMLNAMESPACES (DEFAULT 'http://www.sitemaps.org/schemas/sitemap/0.9'
    , 'http://www.google.com/schemas/sitemap-image/1.1' AS image)  
SELECT @Xml = (SELECT loc, changefreq, [priority], [image] as [image:image/image:loc]
    , [caption] as [image:image/image:caption]
FROM (
  VALUES ('https://example.com/product1','https://example.com/asset/img1.jpg','title1', 10, 0.1)
      , ('https://example.com/product2','https://example.com/asset/img2.jpg','title1', 20, 0.2)
) P (loc, [image], caption, changefreq, [priority])
FOR XML PATH ('url'), ROOT('urlset'));

SELECT @Xml;

-- Convert to a string and add the `version` + `encoding` tag.
SELECT @XMLStr + CAST(@XML AS NVARCHAR(MAX));

返回：

<?xml version="1.0" encoding="UTF-8"?>
<urlset xmlns:image="http://www.google.com/schemas/sitemap-image/1.1" xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
  <url>
    <loc>https://example.com/product1</loc>
    <changefreq>10</changefreq>
    <priority>0.1</priority>
    <image:image>
      <image:loc>https://example.com/asset/img1.jpg</image:loc>
      <image:caption>title1</image:caption>
    </image:image>
  </url>
  <url>
    <loc>https://example.com/product2</loc>
    <changefreq>20</changefreq>
    <priority>0.2</priority>
    <image:image>
      <image:loc>https://example.com/asset/img2.jpg</image:loc>
      <image:caption>title1</image:caption>
    </image:image>
  </url>
</urlset>

注意：您没有提供更改频率和代表它的单词之间的映射。