Question

我正在尝试返回在sql中具有特定属性的xml。

xml看起来像这样：

<Settings>
  <Item Name="ColorScheme" Type="XDocument">
  <ColorScheme>
     <ItemStyle Name="element-song" Title="Song" ForeColor="#0538ac" BackColor="#e8f1fa" Media="1" />
     <ItemStyle Name="element-song-print" Title="Song (print)" ForeColor="#0538ac" BackColor="" Media="2" />
     <ItemStyle Name="element-spot" Title="Spot" ForeColor="#048b27" BackColor="#e9ffee" Media="1" />
     <ItemStyle Name="element-spot-print" Title="Spot (print)" ForeColor="#048b27" BackColor="" Media="2" />
     <ItemStyle Name="element-programming" Title="Programming" ForeColor="#0538ac" BackColor="#e8f1fa" Media="1" />
     <ItemStyle Name="element-programming-print" Title="Programming (print)" ForeColor="#0538ac" BackColor="" Media="2" />
     <ItemStyle Name="element-continued-programming" Title="Continued programming" ForeColor="#0538ac" BackColor="#e8f1fa" Media="1" />
     <ItemStyle Name="element-continued-programming-print" Title="Continued programming (print)" ForeColor="#0538ac" BackColor="" Media="2" />
  </ColorScheme>
  </Item>
  <Item Name="SendWeeklyNewAccountEmail" Type="Boolean">False</Item>
  <Item Name="UseEstimatedDurationsForAnalysis" Type="Boolean">True</Item>
  <Item Name="CalendarStyle" Type="Int32">1</Item>
  <Item Name="IncludeAdExForAnalysis" Type="Boolean">True</Item>
</Settings>

我用来选择包含colorscheme属性的字段的查询是：

SELECT * FROM CustomSettings WITH (NOLOCK)WHERE settings_xml.value('(/Settings/Item/@Name)[1]', 'varchar(25)') = 'ColorScheme' order by 1 desc

我遇到的问题是它只选择将ColorScheme作为第一个字段的xml。如果它进一步位于xml（这是一种可能性），它不会被选中。我理解这是因为我在查询中有[1]，但如果删除此部分，则查询不正确。那么我应该把它放在什么地方让它不具体位置？

Answer 1

SELECT * 
FROM CustomSettings 
WITH (NOLOCK)
WHERE settings_xml.value('(/Settings/Item[@name="ColorScheme"]/@Name)[1]', 'varchar(25)') IS NOT NULL
order by 1 desc

Answer 2

DECLARE @x TABLE (x XML)

INSERT INTO @x 
VALUES ('<Settings>   <Item Name="ColorScheme" Type="XDocument">   <ColorScheme>      <ItemStyle Name="element-song" Title="Song" ForeColor="#0538ac" BackColor="#e8f1fa" Media="1" />      <ItemStyle Name="element-song-print" Title="Song (print)" ForeColor="#0538ac" BackColor="" Media="2" />      <ItemStyle Name="element-spot" Title="Spot" ForeColor="#048b27" BackColor="#e9ffee" Media="1" />      <ItemStyle Name="element-spot-print" Title="Spot (print)" ForeColor="#048b27" BackColor="" Media="2" />      <ItemStyle Name="element-programming" Title="Programming" ForeColor="#0538ac" BackColor="#e8f1fa" Media="1" />      <ItemStyle Name="element-programming-print" Title="Programming (print)" ForeColor="#0538ac" BackColor="" Media="2" />      <ItemStyle Name="element-continued-programming" Title="Continued programming" ForeColor="#0538ac" BackColor="#e8f1fa" Media="1" />      <ItemStyle Name="element-continued-programming-print" Title="Continued programming (print)" ForeColor="#0538ac" BackColor="" Media="2" />   </ColorScheme>   </Item>   <Item Name="SendWeeklyNewAccountEmail" Type="Boolean">False</Item>   <Item Name="UseEstimatedDurationsForAnalysis" Type="Boolean">True</Item>   <Item Name="CalendarStyle" Type="Int32">1</Item>   <Item Name="IncludeAdExForAnalysis" Type="Boolean">True</Item> </Settings> ')
, ('<Settings>  <Item Name="SendWeeklyNewAccountEmail" Type="Boolean">False</Item>   <Item Name="UseEstimatedDurationsForAnalysis" Type="Boolean">True</Item>   <Item Name="CalendarStyle" Type="Int32">1</Item>   <Item Name="IncludeAdExForAnalysis" Type="Boolean">True</Item> </Settings> )')
, ('<Settings>   <Item Name="IncludeAdExForAnalysis" Type="Boolean">True</Item>  <Item Name="ColorScheme" Type="XDocument">   <ColorScheme>      <ItemStyle Name="element-song" Title="Song" ForeColor="#0538ac" BackColor="#e8f1fa" Media="1" />      <ItemStyle Name="element-song-print" Title="Song (print)" ForeColor="#0538ac" BackColor="" Media="2" />      <ItemStyle Name="element-spot" Title="Spot" ForeColor="#048b27" BackColor="#e9ffee" Media="1" />      <ItemStyle Name="element-spot-print" Title="Spot (print)" ForeColor="#048b27" BackColor="" Media="2" />      <ItemStyle Name="element-programming" Title="Programming" ForeColor="#0538ac" BackColor="#e8f1fa" Media="1" />      <ItemStyle Name="element-programming-print" Title="Programming (print)" ForeColor="#0538ac" BackColor="" Media="2" />      <ItemStyle Name="element-continued-programming" Title="Continued programming" ForeColor="#0538ac" BackColor="#e8f1fa" Media="1" />      <ItemStyle Name="element-continued-programming-print" Title="Continued programming (print)" ForeColor="#0538ac" BackColor="" Media="2" />   </ColorScheme>   </Item>   <Item Name="SendWeeklyNewAccountEmail" Type="Boolean">False</Item>   <Item Name="UseEstimatedDurationsForAnalysis" Type="Boolean">True</Item>   <Item Name="CalendarStyle" Type="Int32">1</Item>  </Settings> ')


SELECT *
FROM @x x1
WHERE  x1.x.exist('(/Settings/Item[@Name="ColorScheme"])') = 1

在文档中的任何位置选择包含xml节点的行

2 个答案: