sql - 将XML节点值分成SQL中的单独行

Question

我有一个带有XML列的SQL表。该列的值如下所示:

 <StudentGroup xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <StudentIds>
    <int>3000</int>
    <int>3001</int>
    <int>3002</int>
    <int>8</int>
    <int>9</int>
  </StudentIds>
</StudentGroup>

我想在单独的一行而不是一行中获取每个StudentID。这是我所做的:

select
    xmlColumn.value('(/StudentGroup/StudentIds)[1]','varchar(max)') as IDs  
from myTable

此select语句在一行中返回ID。像这样:

30003001300289

想要的是

3000
3001
3002
8
9

请帮忙!提前致谢。

Answer 1

在变量中包含XML时:

DECLARE @x XML = '
<StudentGroup xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <StudentIds>
    <int>3000</int>
    <int>3001</int>
    <int>3002</int>
    <int>8</int>
    <int>9</int>
  </StudentIds>
</StudentGroup>';

SELECT
    n.v.value('.','INT') AS ID
FROM
    @x.nodes('/StudentGroup/StudentIds/int') AS n(v);

在表中有XML时:

DECLARE @x XML = '
<StudentGroup xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <StudentIds>
    <int>3000</int>
    <int>3001</int>
    <int>3002</int>
    <int>8</int>
    <int>9</int>
  </StudentIds>
</StudentGroup>';

DECLARE @t TABLE(
    x XML
);
INSERT INTO @t(x)VALUES(@x);

SELECT
    n.v.value('.','INT') AS ID
FROM
    @t
    CROSS APPLY x.nodes('/StudentGroup/StudentIds/int') AS n(v);