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(转)Xml DML

2010-04-26T12:56:00Z

declare @myxml xml
set @myxml='<?xml version="1.0" encoding="gb2312"?>
            <root>
               <item id="1">
               </item>
            </root>'
select @myxml

--1、插入item的第一个子元素
set @myxml.modify('insert <course1>sql server2005</course1> into (root/item)[1]') select @myxml
--2、插入item的第一个子元素，插入到同级子元素前面
set @myxml.modify('insert <sname> 王一诺</sname> as first into (root/item)[1]') select @myxml
--3、插入item的第一个子元素，插入到同级子元素后面
set @myxml.modify('insert <grade>82</grade> as last into (root/item)[1]') select @myxml
--4、插入第二个item节点
set @myxml.modify('insert <item id="2" year="2009"></item> into (/root)[1]') select @myxml
--或者
set @myxml.modify('insert <item id="2" year="2009"></item> after (/root/item)[1]')
--5、向第二个item节点插入多个元素
set @myxml.modify('insert (<sname>王海</sname>,<course1>sql server2005</course1>,<grade>75</grade>) into (/root/item)[2]')
--6、插入属性
set @myxml.modify('insert attribute year{"2009"} into (/root/item)[1]')
select @myxml
--7、插入多个属性
set @myxml.modify('insert (attribute depart{"计算机"},attribute class{"1班"}) into (/root/item)[1]')
--8、插入文本节点
set @myxml.modify('insert text{"成绩表"} as first into (/root)[1]')

--9、插入整个节点
set @myxml.modify('insert <item id="3" year="2009">
                           <sname>王若天</sname>
                           <course1>oracle</course1>
                           <grade>59</grade></item>
                     into (/root)[1]')
--10、插入处理指令
SET @myxml.modify('insert <?Program ="Instructions.exe" ?> before (/root)[1] ')
select @myxml
二、删除操作
declare @myxml xml
set @myxml='<?Program ="Instructions.exe" ?>
          <root>成绩表--这是个文本节点
             <item id="1" year="2009" depart="计算机" >
               <sname> 王一诺</sname>
               <course1>sql server2005</course1>
               <grade>82</grade>
             </item>
             <item id="2" year="2009" >
               <sname>王海</sname>
               <course1>sql server2005</course1>
               <grade>75</grade></item>
             <item id="3" year="2009" >
               <sname>王若天</sname>
               <course1>oracle</course1>
               <grade>59</grade>
             </item>
           </root>'

--1、删除所有指令
set @myxml.modify('delete //processing-instruction()')
select '删除所有指令'=@myxml
--2、删除文本节点
set @myxml.modify('delete /root/text()')
select '删除文本节点'=@myxml
--3、删除节点id为的属性
set @myxml.modify('delete /root/item[@id=1]/@class')
select '删除节点id为的属性'=@myxml
--4、删除第二个节点属性
set @myxml.modify('delete /root/item[2]/@class')
select '删除第二个节点属性'=@myxml
--5、删除节点属性
set @myxml.modify('delete /root/item/@class')
select '删除节点属性'=@myxml
--6、删除节点id为的元素
set @myxml.modify('delete /root/item[@id=1]/grade')
select '删除节点id为的元素'=@myxml
--7、删除第二个节点元素
set @myxml.modify('delete /root/item[2]/grade')
select '删除第二个节点元素'=@myxml
--8、删除元素
set @myxml.modify('delete /root/item/grade')
select '删除元素'=@myxml
--9、删除id为的节点
set @myxml.modify('delete /root/item[@id=2]')
select '删除id为的节点'=@myxml
--10、删除第二个的节点
set @myxml.modify('delete /root/item[2]')
select '删除id为的节点'=@myxml
--11、删除第二个节点
set @myxml.modify('delete /root/item')
select '删除节点'=@myxml
三、修改操作
--1、修改文本的值
set @myxml.modify('replace value of(/root/text())[1] with "1班成绩表"')
select @myxml
--2、修改元素的值
set @myxml.modify('replace value of(/root/item[@id=3]/grade/text())[1] with "60"')
select @myxml
--3、修改属性的值
set @myxml.modify('replace value of(/root/item[@id=1]/@class)[1] with "2班"')
select @myxml

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（转）sql:variable() binding and modify method of xquery: insert XML DML

2010-04-25T09:50:00Z

10月25日

sql:variable() binding and modify method of xquery: insert XML DML

/*
In SQL Server 2005, we can use sql:variable and sql:column function to bind relational data into XML by means of xquery. However, the binding has special syntax and it is easy to be confused.
1) insert ELEMENT:
The element text can be bind to an sql variable:
/
USE AdventureWorks;
GO
DECLARE
@myDoc xml
SET
@myDoc = '<Root>
<ProductDescription ProductID="1" ProductName="Road Bike">
<Features>
</Features>
</ProductDescription>
</Root>'

DECLARE
@v nvarchar(50),@v1 nvarchar(50), @Maintenance nvarchar(50)
SET
@Maintenance=N'No Maintenance Required'
SET
@myDoc.modify('
insert <Maintenance>{"Refill Water As Needed"}</Maintenance> as last
into (/Root/ProductDescription/Features)[1]'

)
SET
@myDoc.modify('
insert <Maintenance>Refill Gas As Needed</Maintenance> as last
into (/Root/ProductDescription/Features)[1]'
)
SET
@myDoc.modify('
insert <Maintenance>{sql:variable("@Maintenance")}</Maintenance> as last
into (/Root/ProductDescription/Features)[1]'

)
SET
@Maintenance=N'Oil Required Every Month'
SET
@myDoc.modify('
insert <Maintenance>{sql:variable("@Maintenance")}</Maintenance> as last
into (/Root/ProductDescription/Features)[1]'

)
SELECT
@myDoc
/
The syntax is to use {sql:variable("@sqlvariable")}. Note if a constant value is used, the '{"' and '"}' pair showed in the first sample can be igored, as showed in the second one, which is the most frequently used syntax for constant.
The '{"' must go together. You can not have '{' without double quotes. SQL Server may insert a blank element or fail. If the constant has spaces, it will fail.
e.g.: the following will insert a empty <Maintenance> element. However if you change {Refill} to {Refill Water}, it will fail.
/

DECLARE
@myDoc xml
SET
@myDoc = '<Root>
<ProductDescription ProductID="1" ProductName="Road Bike">
<Features>
</Features>
</ProductDescription>
</Root>'

SET
@myDoc.modify('
insert <Maintenance>{Refill}</Maintenance> as last
into (/Root/ProductDescription/Features)[1]'

)
SELECT
@myDoc
GO
/
2) insert ATTRIBUTE
The syntax is {sql:variable("@sql_variable")}. If the value is a constant and it does not have spaces,
the double quotes pair can be ommited. The bracket '{' pair can never be ommited. If you change the attribute PartList {"P1 P2 P3"} to attribute PartList {P1 P2 P3}, it will fail
*/

DECLARE
@myDoc xml
SET
@myDoc = '<Root>
<ProductDescription ProductID="1" ProductName="Road Bike">
<Features>
</Features>
</ProductDescription>
</Root>'

DECLARE
@v nvarchar(50),@v1 nvarchar(50)
SELECT
@v='20',@v1='M001'
SET
@myDoc.modify('insert ( attribute PartList {"P1 P2 P3"},
attribute PriceSuggested {100000.00},
attribute LaborHours {sql:variable("@v")},
attribute Code {sql:variable("@v1")})
into (/Root/ProductDescription)[1]'

)
SELECT
@myDoc
To summary, always use {sql:variable("@sql_variable")} syntax in insert XML DML regardless for elements or attributes. For constant, type the constant directly as the text of the element and enclose the constant in {" "} pair for attributes.

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