在SQLServer 2012 TSQL中,使用XML RAW,XML AUTO和XML PATH有什么区别

Question

作为标题,所有开放的思想都受到欢迎

我在我的电脑上测试过,输出似乎是一样的.

例如.

USE BOB_DATABASE
SELECT ID, Name, First_Name, Last_Name FROM DBO.T_User
FOR XML AUTO

USE BOB_DATABASE
SELECT ID, Name, First_Name, Last_Name FROM DBO.T_User
FOR XML RAW

USE BOB_DATABASE
SELECT ID, Name, First_Name, Last_Name FROM DBO.T_User
FOR XML RAW, ELEMENTS

USE BOB_DATABASE
SELECT ID, Name, First_Name, Last_Name FROM DBO.T_User
FOR XML PATH('CUSTOMERS')

Answer 1

XML RAW:结果集中的每一行都被视为一个元素,您的列是属性.

例:

USE BOB_DATABASE
SELECT ID, Name, First_Name, Last_Name 
FROM DBO.T_User
FOR XML RAW;

OUTPUT:

<row id="7801020202083" First_Name="John" Surname="Doe" />
<row id="9812150201082" First_Name="Samantha" Surname="Hill" />

XML AUTO:表名是您的元素

例:

USE BOB_DATABASE
SELECT ID, Name, First_Name, Last_Name 
FROM DBO.T_User
FOR XML AUTO;

OUTPUT:

<DBO.T_USER id="7801020202083" First_Name="John" Surname="Doe" />
<DBO.T_USER  id="7801020202083" First_Name="John" Surname="Doe" />

XML路径:表列作为子元素传递.

例:

USE BOB_DATABASE
SELECT ID, Name, First_Name, Last_Name 
FROM DBO.T_User
FOR XML PATH;

OUTPUT:

<row>
  <id>7801020202083</id>
  <First_Name>John</First_Name>
  <Surname>Doe</Surname>
</row>
<row>
  <id>7801020202083</id>
  <First_Name>John</First_Name>
  <Surname>Doe</Surname>
</row>

同时请参阅此博客https://www.simple-talk.com/sql/learn-sql-server/using-the-for-xml-clause-to-return-query-results-as-xml/ 了更好的故障.

Answer 2

不幸的是他们真的不一样.看看节点的布局方式.看看属性.有一些微妙的差异会对XML的使用方式产生重大影响.也许你需要控制根元素:ROOT('SomeElementName').MSDN对每个语法选项都有一个非常全面的解释. MSDN FOR XML.我发布了一些代码,可以帮助您解决差异.此外,只有在代码中进行连接时,某些语法才会有明显的更改.从而帮助您建立层次结构.

IF OBJECT_ID('tempdb..#XmlTestTable') IS NOT NULL DROP TABLE #XmlTestTable
CREATE TABLE #XmlTestTable 
(
    ID INT PRIMARY KEY IDENTITY(1,1),
    FirstName VARCHAR(20),
    LastName VARCHAR(20)
)
INSERT INTO #XmlTestTable (FirstName,LastName) VALUES
('John','Doe'),
('Jane','Doe'),
('Brian','Smith'),
('Your','Mom')

--YOUR TESTS
SELECT * FROM #XmlTestTable FOR XML AUTO
SELECT * FROM #XmlTestTable FOR XML RAW
SELECT * FROM #XmlTestTable FOR XML RAW, ELEMENTS
SELECT * FROM #XmlTestTable FOR XML PATH('Customers')

DROP TABLE #XmlTestTable