[英]TSQL Parse from XML nodes
此 XML 來自國庫。 SQL 服務器好像認為不是 XML? 我的結果表明 XLT 方法只能與列類型 XML 相關。 這個來自國庫的結果集真的是XML嗎?
如何將其解析為 SQL 表?
DECLARE @XML NVARCHAR(MAX)
SELECT @XML =
'<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<feed xml:base="http://data.treasury.gov/Feed.svc/" xmlns:d="http://schemas.microsoft.com/ado/2007/08/dataservices" xmlns:m="http://schemas.microsoft.com/ado/2007/08/dataservices/metadata" xmlns="http://www.w3.org/2005/Atom">
<title type="text">DailyTreasuryYieldCurveRateData</title>
<id>http://data.treasury.gov/feed.svc/DailyTreasuryYieldCurveRateData</id>
<updated>2020-07-14T05:40:26Z</updated>
<link rel="self" title="DailyTreasuryYieldCurveRateData" href="DailyTreasuryYieldCurveRateData"/>
<entry>
<id>http://data.treasury.gov/Feed.svc/DailyTreasuryYieldCurveRateData(7633)</id>
<title type="text"/>
<updated>2020-07-14T05:40:26Z</updated>
<author>
<name/>
</author>
<link rel="edit" title="DailyTreasuryYieldCurveRateDatum" href="DailyTreasuryYieldCurveRateData(7633)"/>
<category term="TreasuryDataWarehouseModel.DailyTreasuryYieldCurveRateDatum" scheme="http://schemas.microsoft.com/ado/2007/08/dataservices/scheme"/>
<content type="application/xml">
<m:properties>
<d:Id m:type="Edm.Int32">7633</d:Id>
<d:NEW_DATE m:type="Edm.DateTime">2020-07-01T00:00:00</d:NEW_DATE>
<d:BC_1MONTH m:type="Edm.Double">0.12</d:BC_1MONTH>
<d:BC_2MONTH m:type="Edm.Double">0.12</d:BC_2MONTH>
<d:BC_3MONTH m:type="Edm.Double">0.14</d:BC_3MONTH>
<d:BC_6MONTH m:type="Edm.Double">0.17</d:BC_6MONTH>
<d:BC_1YEAR m:type="Edm.Double">0.16</d:BC_1YEAR>
<d:BC_2YEAR m:type="Edm.Double">0.17</d:BC_2YEAR>
<d:BC_3YEAR m:type="Edm.Double">0.19</d:BC_3YEAR>
<d:BC_5YEAR m:type="Edm.Double">0.31</d:BC_5YEAR>
<d:BC_7YEAR m:type="Edm.Double">0.52</d:BC_7YEAR>
<d:BC_10YEAR m:type="Edm.Double">0.69</d:BC_10YEAR>
<d:BC_20YEAR m:type="Edm.Double">1.2</d:BC_20YEAR>
<d:BC_30YEAR m:type="Edm.Double">1.43</d:BC_30YEAR>
<d:BC_30YEARDISPLAY m:type="Edm.Double">1.43</d:BC_30YEARDISPLAY>
</m:properties>
</content>
</entry>
</feed>'
SELECT b.value('@d:Id', 'varchar(28)') as d_id
,b.value('@d:BC_30YEAR', 'double') as d_BC_30YEAR
FROM @XML.nodes('feed/entry/content type/m:properties/') as a(b)
首先,將您的@XML
定義為XML
類型:
DECLARE @XML XML;
那么:需要定義相關的 XML 所涉及的命名空間!
試試這段代碼:
-- define XML namespaces!
;WITH XMLNAMESPACES(DEFAULT 'http://www.w3.org/2005/Atom',
'http://schemas.microsoft.com/ado/2007/08/dataservices/metadata' AS m,
'http://schemas.microsoft.com/ado/2007/08/dataservices' AS d)
SELECT
b.value('(d:Id)[1]', 'varchar(28)') as d_id,
b.value('(d:BC_30YEAR)[1]', 'decimal(20,2)') as d_BC_30YEAR
FROM
@XML.nodes('feed/entry/content/m:properties') as a(b)
這將返回以下值:
我所做的修復:
FROM @XML.nodes('feed/entry/content type/m:properties/') as a(b)
^^^^^^^^^^^^
錯誤的節點名稱 - 節點是<content>
(不是“內容類型”) - type
只是節點上的一個屬性,在此 XPath 中沒有相關性。
SELECT b.value('@d:Id', 'varchar(28)') as d_id
^^^^^^
你真的想要 select XML元素(節點) d:Id
- 不是屬性 - @d:Id
中的@
表示屬性!
b.value('@d:BC_30YEAR', 'double') as d_BC_30YEAR
^^^^^^^^^
您需要使用正確的 T-SQL 數據類型——比如decimal(20,2)
——這里不是“double”....
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.