具有属性的 SQL Server FOR XML PATH ROOT 元素（路径模式符号 @ 或 / ）答案

【问题标题】：SQL Server FOR XML PATH ROOT element with attribute (Path Mode symbol @ or / )具有属性的 SQL Server FOR XML PATH ROOT 元素（路径模式符号 @ 或 / ）
【发布时间】：2018-01-25 04:43:15
【问题描述】：

我需要这样的输出

<Employee EmpID="4">
  <FirstName>Rob</FirstName>
  <LastName>Walters</LastName>
</Employee>
<Employee EmpID="168">
  <FirstName>Rob</FirstName>
  <MiddleName>T</MiddleName>
  <LastName>Caron</LastName>
</Employee>

但是执行此操作的 SQL：

SELECT e.EmployeeID AS "@EmpID",
   c.FirstName, 
   c.MiddleName, c.LastName
FROM Employee AS e 
INNER JOIN Contact AS c 
ON c.ContactID = e.ContactID
WHERE c.FirstName = 'Ross'
FOR XML PATH (''), ROOT ('Employees');

返回此错误：

SQL Server Database Error: Row tag omission (empty row tag name) cannot be used with attribute-centric FOR XML serialization.

查看 SQLFiddle：

SQLFiddle

【问题讨论】：

SELECT (SELECT e.EmployeeID AS "@EmpID" FOR XML PATH ('EmployeeID'), TYPE), c.FirstName, c.MiddleName, c.LastName ... FOR XML PATH ('Employee'), ROOT ('Employees'); 可能是您所追求的。
嘿@ZLK 谢谢，但不是这样...您的代码的结果是：<Employee><Employee EmpID="256"/><FirstName>Ross</FirstName><MiddleName></MiddleName><LastName>Geller</LastName></Employee> SQLFiddle 但我需要<Employee EmpID="256"><FirstName>Ross</FirstName><MiddleName></MiddleName><LastName>Geller</LastName></Employee>
呃，那么您只需将当前查询中的for xml path ('') 更改为for xml path ('Employee')。
供参考：Link: "Red Gate - Using the FOR XML Clause"
@ZLK 这很好用，谢谢....SQLFiddle

标签： sql-server xml for-xml-path for-xml

【解决方案1】：

最好的方法是使用正确的代码：

SELECT 
e.EmployeeID AS "@EmpID",
c.FirstName, 
c.MiddleName, c.LastName
FROM Employee AS e 
INNER JOIN Contact AS c 
ON c.ContactID = e.ContactID
WHERE c.FirstName = 'Ross'
FOR XML PATH ('Employee')
;

喜欢正确的 SQLFiddle：http://www.sqlfiddle.com/#!6/3a159/8/0

【讨论】：