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--创建测试数据库
CREATE DATABASE TK431Chapter8
GO
USE TK431Chapter8
GO
--创建schema
declare @schema XML
SELECT @schema = c FROM OPENROWSET (
BULK 'C:/logRecordSchema.xsd', SINGLE_BLOB) AS TEMP(c)
CREATE XML SCHEMA COLLECTION LogRecordSchema AS @schema
--创建表
CREATE TABLE UniversalLog
( ID INT IDENTITY(1,1) NOT NULL,
LogDateTime DATETIME NOT NULL CONSTRAINT [DF_UniversalLog_LogDateTime]
DEFAULT (GetDate()),
ApplicationName NVARCHAR(50) NOT NULL,
LogRecord XML(LogRecordSchema) NULL )
--插入数据
INSERT UniversalLog(ApplicationName, LogRecord)
VALUES ( 'HR',
'<logRecord machine="server1" timestamp="2000-01-14T12:13:14Z">
<error number="1001">
<message>The user does not have enough permissions to execute query</message>
<module>DataAccessLayer</module>
</error>
</logRecord>')
INSERT UniversalLog(ApplicationName, LogRecord)
VALUES ('CustomerService',
'<logRecord machine="server2" timestamp="2000-01-15T12:13:14Z">
<post eventType="logOut"/>
<information flag="custom">
<message>User must change password on next login</message>
</information>
</logRecord>')
INSERT UniversalLog(ApplicationName, LogRecord)
VALUES ('HoursReport',
'<logRecord machine="server2" timestamp="2000-01-11T12:13:14Z">
<information flag="failure">
<message>Hard Disk with ID #87230283 is not responding</message>
</information>
<error number="18763">
<message>Application can not start</message>
<module>AppLoader</module>
</error>
<post eventType="appStart"/>
</logRecord>')
SELECT * FROM UniversalLog
--查询
USE AdventureWorks
GO
--一FOR XML RAW
--每个字段作为属性
SELECT Department.[DepartmentID]
,History.[EmployeeID]
,History.[StartDate]
,Department.[Name]
,DATEDIFF(year, History.[StartDate], GetDate()) AS YearsToDate
FROM HumanResources.Department, HumanResources.EmployeeDepartmentHistory History
WHERE Department.DepartmentID = History.DepartmentID
AND History.EndDate IS NULL
ORDER BY Department.[DepartmentID], History.[StartDate]
FOR XML RAW('OldestEmployeeByDepartment')
--每个字段作为子元素
SELECT Department.[DepartmentID]
,History.[EmployeeID]
,History.[StartDate]
,Department.[Name] AS DepartmentName
,DATEDIFF(year, History.[StartDate], GetDate()) AS YearsToDate
FROM HumanResources.Department, HumanResources.EmployeeDepartmentHistory History
WHERE Department.DepartmentID = History.DepartmentID
AND History.EndDate IS NULL
ORDER BY Department.[DepartmentID], History.[StartDate]
FOR XML RAW('OldestEmployeeByDepartment'), ELEMENTS
--二FOR XML AUTO 模式（嵌套的XML格式）
SELECT Department.[DepartmentID]
,History.[EmployeeID]
,History.[StartDate]
,Department.[Name] AS DepartmentName
,DATEDIFF(year, History.[StartDate], GetDate()) AS YearsToDate
FROM HumanResources.Department, HumanResources.EmployeeDepartmentHistory History
WHERE Department.DepartmentID = History.DepartmentID
AND History.EndDate IS NULL
ORDER BY Department.[DepartmentID], History.[StartDate] FOR XML AUTO
SELECT Department.[DepartmentID]
,History.[EmployeeID]
,History.[StartDate]
,Department.[Name] AS DepartmentName
,DATEDIFF(year, History.[StartDate], GetDate()) AS YearsToDate
FROM HumanResources.Department, HumanResources.EmployeeDepartmentHistory History
WHERE Department.DepartmentID = History.DepartmentID
AND History.EndDate IS NULL
ORDER BY Department.[DepartmentID], History.[StartDate] FOR XML AUTO, ELEMENTS
把表转化为XML
--三FOR XML PATH 以元素为中心
USE AdventureWorks
GO
SELECT History.[StartDate] '@StartDate'
,Department.[DepartmentID] 'Department/@id'
,Department.[Name] 'comment()'
,History.[EmployeeID] 'Department/Employee/@id'
,'Years in role:' 'Department/Employee/data()'
,DATEDIFF(year, History.[StartDate], GetDate()) 'Department/Employee/data()'
FROM HumanResources.Department, HumanResources.EmployeeDepartmentHistory History
WHERE Department.DepartmentID = History.DepartmentID
AND History.EndDate IS NULL
ORDER BY Department.[DepartmentID], History.[StartDate] FOR XML PATH ('ForEachRow')
--如果希望针对NULL 值生成元素，则可以指定带有XSINIL 的ELEMENTS 指令
SELECT EmployeeID "@EmpID",
FirstName "EmpName/First",
MiddleName "EmpName/Middle",
LastName "EmpName/Last"
FROM HumanResources.Employee E, Person.Contact C
WHERE E.EmployeeID = C.ContactID
AND E.EmployeeID=1
FOR XML PATH, ELEMENTS XSINIL
SELECT
ProductModelID,
Name
FROM Production.ProductModel
WHERE ProductModelID=122 or ProductModelID=119
FOR XML PATH
go
SELECT ProductModelID,
Name
FROM Production.ProductModel
WHERE ProductModelID=122 or ProductModelID=119
FOR XML RAW, ELEMENTS
-- 以上两种模式结果一样
--如果指定零长度字符串，则将不生成包装元素。
SELECT ProductModelID,
Name
FROM Production.ProductModel
WHERE ProductModelID=122 or ProductModelID=119
FOR XML PATH ('')
Go
--生成的XML 将包含指定的行元素名称
SELECT ProductModelID,
Name
FROM Production.ProductModel
WHERE ProductModelID=122 or ProductModelID=119
FOR XML PATH ('ProductModel')
Go
--在以下查询中，指定的ProductModelID 列名以@ 开头，且不包含斜杠标记(/)。因此，在生成的XML 中，将创建包含相应列值的<row> 元素的属性。
SELECT ProductModelID as "@id",
Name
FROM Production.ProductModel
WHERE ProductModelID=122 or ProductModelID=119
FOR XML PATH ('ProductModelData')
go
--指定root 选项来添加单个顶级元素
SELECT ProductModelID as "@id",
Name
FROM Production.ProductModel
WHERE ProductModelID=122 or ProductModelID=119
FOR XML PATH ('ProductModelData'), root ('Root')
go
SELECT ProductModelID as "@id",
NAME AS "SomeChild/ModelName"
FROM Production.ProductModel
WHERE ProductModelID=122 or ProductModelID=119
FOR XML PATH ('ProductModelData'), root ('Root')
go
--Instructions 列是xml 类型，因此指定了xml 数据类型的query() 方法来检索该位置
SELECT ProductModelID as "@id",
Name,
Instructions.query('declare namespace MI="http://schemas.microsoft.com/sqlserver/2004/07/adventure-works/ProductModelManuInstructions";
/MI:root/MI:Location
') as ManuInstr
FROM Production.ProductModel
WHERE ProductModelID=7
FOR XML PATH ('ProductModelData'), root ('Root')
go
--使用WITH XMLNAMESPACES 绑定和在FOR XML 查询中使用前缀首先定义命名空间的前缀
WITH XMLNAMESPACES (
'uri1' as ns1,
'uri2' as ns2,
'http://schemas.microsoft.com/sqlserver/2004/07/adventure-works/ProductModelManuInstructions' as MI)
SELECT ProductModelID as "ns1:ProductModelID",
Name as "ns1:Name",
Instructions.query('
/MI:root/MI:Location
')
FROM Production.ProductModel
WHERE ProductModelID=7
FOR XML PATH ('ns2:ProductInfo'), root('ns1:root')
go
--使用PATH 模式生成值列表
SELECT ProductModelID as "@ProductModelID",
Name as "@ProductModelName",
(SELECT ProductID as "data()"
FROM Production.Product
WHERE Production.Product.ProductModelID =
Production.ProductModel.ProductModelID
FOR XML PATH ('')) as "@ProductIDs",
(SELECT Name as "ProductName"
FROM Production.Product
WHERE Production.Product.ProductModelID =
Production.ProductModel.ProductModelID
FOR XML PATH ('')) as "ProductNames"
FROM Production.ProductModel
WHERE ProductModelID= 7 or ProductModelID=9
FOR XML PATH('ProductModelData')
--PATH 模式查询将构造带命名空间的XML
SELECT 'en' as "English/@xml:lang",
'food' as "English",
'ger' as "German/@xml:lang",
'Essen' as "German"
FOR XML PATH ('Translation')
go
-- 利用TYPE生产XML类型
DECLARE @myXML XML
SET @myXML = (SELECT 100 'col1',
200 'col2',
NULL 'col3',
400 'col4'
FOR XML RAW, ELEMENTS XSINIL, TYPE)
SELECT @myXML
--嵌套
SELECT Department.[DepartmentID],
Department.[Name],
(
SELECT EmployeeDepartmentHistory.[EmployeeID]
,EmployeeDepartmentHistory.[StartDate]
,DATEDIFF(year, EmployeeDepartmentHistory.[StartDate], GetDate()) AS
YearsToDate
FROM HumanResources.EmployeeDepartmentHistory
WHERE Department.DepartmentID = EmployeeDepartmentHistory.DepartmentID
AND EmployeeDepartmentHistory.EndDate IS NULL
ORDER BY EmployeeDepartmentHistory.[StartDate]
FOR XML RAW('Employee'), TYPE
) AS Employees
FROM HumanResources.Department
ORDER BY Department.[DepartmentID]
FOR XML RAW('Department'), ELEMENTS, ROOT ('OldestEmployeeByDepartment')
--四FOR XML EXPLICIT模式太复杂可以用FOR XML PATH代替