在 SQL 中创建 XML（对于 XML 显式）

Question

需要一点帮助在 SQL 服务器中创建一些 XML。

结果 XML 应如下所示：

<?xml version="1.0" encoding="utf-8"?>
<Root Version="2.17" KFZ="XX-DD 389">
  <Head name="ExecuteAnswer">
    <Key name="AnswerStatus" value="-OK" />
    <Key name="MsgId"><![CDATA[KFHB0907896aAUH223]]></Key>
    <Section name="Command">
      <Key name="Name" value="SetNewCommand" />
      <Key name="Param0"><![CDATA[XX-DD 389]]></Key>
      <Key name="Param1"><![CDATA[]]></Key>
      <Key name="Param2"><![CDATA[0987asfdsafhdsSS]]></Key>
      <Key name="Param3"><![CDATA[0097aSSSHSDOPir0]]></Key>
    </Section>
  </Head>
  <Data></Data>
</Root>

我无法将 <Section> 添加到 XML，如果我用 [Section!3!name] 添加它，我会收到此错误：

error -> Key will be overwritten by Section

代码：

SELECT 
   1 AS Tag, 
   NULL AS Parent,
   '2.17' AS [Root!1!Version],
   'XX-DD 389' AS [Root!1!KFZ],
   NULL AS [Head!2!name!Element],
   NULL AS [Key!3!name],
   NULL AS [Key!3!value],
   NULL AS [Key!3!CDATA]

UNION ALL               

SELECT 
    2 as Tag,  
    1 as Parent,    
    NULL,
    NULL,
    'ExecuteAnswer',
    NULL,
    NULL,
    NULL

UNION ALL 

SELECT 
    3 as Tag,  
    2 as Parent,    
    NULL,           
    NULL,           
    NULL,           
    'AnswerStatus',
    '-OK',
    NULL

UNION ALL 

SELECT 
    3 as Tag,  
    2 as Parent,    
    NULL,           
    NULL,           
    NULL,           
    'MsgId',
    NULL,           
    'KFHB0907896aAUH223'
FOR XML EXPLICIT

有人能帮帮我吗？

问候亚历克斯

Answer 1

正如评论中指出的，没有理由再使用 CDATA...它在语义上与正确转义的 normal text() 节点完全相同.

但是，有时遗留系统或第三方工具需要它。

您必须知道的事情：没有机会 将 xml declaration 添加到 XML 除了强制转换为 NVARCHAR(MAX) 和手动附加它。

因此，如果您无论如何都必须检查字符串，您可以使用 FOR XML PATH() 创建 XML 干净简单的 ，创建 CDATA as <xdata>content</xdata> 并做一个简单的 REPLACE 将这些占位符更改为 CDATA 开始和结束字符。

然而：这是一种 EXPLICIT

的方法

SELECT 
   1 AS Tag, 
   NULL AS Parent,
   '2.17' AS [Root!1!Version],
   'XX-DD 389' AS [Root!1!KFZ],
   NULL AS [Head!2!name!Element],
   NULL AS [Key!3!name],
   NULL AS [Key!3!value],
   NULL AS [Key!3!!CDATA],
   NULL AS [Section!4!name],
   NULL AS [Key!5!name],
   NULL AS [Key!5!value],
   NULL AS [Key!6!name],
   NULL AS [Key!6!!CDATA]

UNION ALL               

SELECT 
    2 as Tag,  
    1 as Parent,    
    NULL,
    NULL,
    'ExecuteAnswer',
    NULL,
    NULL,
    NULL,
    NULL,
    NULL,
    NULL,
    NULL,
    NULL

UNION ALL 

SELECT 
    3 as Tag,  
    2 as Parent,    
    NULL,           
    NULL,           
    NULL,           
    'AnswerStatus',
    '-OK',
    NULL,
    NULL,
    NULL,
    NULL,
    NULL,
    NULL

UNION ALL 

SELECT 
    3 as Tag,  
    2 as Parent,    
    NULL,           
    NULL,           
    NULL,           
    'MsgId',
    NULL,           
    'KFHB0907896aAUH223',
    NULL,
    NULL,
    NULL,
    NULL,
    NULL

    UNION ALL 

SELECT 
    4 as Tag,  
    2 as Parent,    
    NULL,           
    NULL,           
    NULL,           
    NULL,
    NULL,           
    NULL,
    'Command',
    NULL,
    NULL,
    NULL,
    NULL

    UNION ALL 

SELECT 
    5 as Tag,  
    4 as Parent,    
    NULL,           
    NULL,           
    NULL,           
    NULL,
    NULL,           
    NULL,
    NULL,
    'Name',
    'SetNewCommand',
    NULL,
    NULL

    UNION ALL 

SELECT 
    6 as Tag,  
    4 as Parent,    
    NULL,           
    NULL,           
    NULL,           
    NULL,
    NULL,           
    NULL,
    NULL,
    NULL,
    NULL,
    'Param0',
    'XX-DD 389'
FOR XML EXPLICIT

在 SQL 中创建 XML（对于 XML 显式）

Create XML in SQL (FOR XML EXPLICIT)

sql-server

xml

cdata

for-xml-path

for-xml-explicit