declare @xml xml,@sql varchar(2000)
set @sql='root/SubMetaTable/'+@columnName+''
set @xml=(select * from 表 where SUBMETA_PK=1069 for xml auto,ELEMENTS XSINIL,xmlschema,root)对于这样生成的xml,带有xmlschema,如何读取节点的名称与文本,节点的数据类型
如: select B.v.value('local-name(.)','varchar(200)'),B.v.value('.',数据类型(从xml读取出来,因为生成的xmlschema会有数据类型)) from @xml.nodes('root/*')我这样读取,貌似取不到数据。。
寻求合理的解决方案
set @sql='root/SubMetaTable/'+@columnName+''
set @xml=(select * from 表 where SUBMETA_PK=1069 for xml auto,ELEMENTS XSINIL,xmlschema,root)对于这样生成的xml,带有xmlschema,如何读取节点的名称与文本,节点的数据类型
如: select B.v.value('local-name(.)','varchar(200)'),B.v.value('.',数据类型(从xml读取出来,因为生成的xmlschema会有数据类型)) from @xml.nodes('root/*')我这样读取,貌似取不到数据。。
寻求合理的解决方案
set @xml=(select * from 表 where SUBMETA_PK=1069 for xml auto,ELEMENTS XSINIL,xmlschema,root)
-->读取节点名称与节点文本(节点为生成的字段)
sql xml 入门:
--by jinjazz
--http://blog.csdn.net/jinjazz
1、xml: 能认识元素、属性和值
2、xpath: 寻址语言,类似windows目录的查找(没用过dir命令的话就去面壁)
语法格式,这些语法可以组合为条件:
"."表示自己,".."表示父亲,"/"表示儿子,"//"表示后代,
"name"表示按名字查找,"@name"表示按属性查找
"集合[条件]" 表示根据条件取集合的子集,条件可以是
数 值:数字,last(),last()-数字 等
布尔值:position()<数字,@name='条件',name='条件'
条件是布尔值的时候可以合并计算:and or
3、xquery: 基于xpath标的准查询语言,sqlserver xquery包含如下函数
exist(xpath条件):返回布尔值表示节点是否存在
query(xpath条件):返回由符合条件的节点组成的新的xml文档
value(xpath条件,数据类型):返回指定的标量值,xpath条件结果必须唯一
nodes(xpath条件): 返回由符合条件的节点组成的一行一列的结果表
*/declare @data xml
set @data='
<bookstore>
<book category="COOKING">
<title lang="en">Everyday Italian</title>
<author>Giada De Laurentiis</author>
<year>2005</year>
<price>30.00</price>
</book>
<book category="CHILDREN">
<title lang="jp">Harry Potter</title>
<author>J K. Rowling</author>
<year>2005</year>
<price>29.99</price>
</book>
<book category="WEB">
<title lang="en">XQuery Kick Start</title>
<author>James McGovern</author>
<author>Per Bothner</author>
<author>Kurt Cagle</author>
<author>James Linn</author>
<author>Vaidyanathan Nagarajan</author>
<year>2003</year>
<price>49.99</price>
</book>
<book category="WEB">
<title lang="cn">Learning XML</title>
<author>Erik T. Ray</author>
<year>2003</year>
<price>39.95</price>
</book>
</bookstore>
'--测试语句,如果不理解语法请参考上面的xpath规则和xquery函数说明--1、文档
select @data
--2、任意级别是否存在price节点
select @data.exist('//price')
--3、获取所有book节点
select @data.query('//book')
--4、获取所有包含lang属性的节点
select @data.query('//*[@lang]')
--5、获取第一个book节点
select @data.query('//book[1]')
--6、获取前两个book节点
select @data.query('//book[position()<=2]')
--7、获取最后一个book节点
select @data.query('//book[last()]')
--8、获取price>35的所有book节点
select @data.query('//book[price>35]')
--9、获取category="WEB"的所有book节点
select @data.query('//book[@category="WEB"]')
--10、获取title的lang="en"的所有book节点
select @data.query('//book/title[@lang="en"]')
--11、获取title的lang="en"且 price>35的所有book节点
select @data.query('//book[./title[@lang="en"] or price>35 ]')
--12、获取title的lang="en"且 price>35的第一book的(第一个)title
select @data.query('//book[./title[@lang="en"] and price>35 ]').value('(book/title)[1]','varchar(max)')
--13、等价于12
select @data.value('(//book[./title[@lang="en"] and price>35 ]/title)[1]','varchar(max)')
--14、获取title的lang="en"且 price>35的第一book的(第一个)title的lang属性
select @data.value('((//book[@category="WEB" and price>35 ]/title)[1]/@lang)[1]','varchar(max)')
--15、获取第一本书的title
select Tab.Col.value('(book/title)[1]','varchar(max)') as title
from @data.nodes('bookstore')as Tab(Col)
--16、获取每本书的第一个author
select Tab.Col.value('author[1]','varchar(max)') as title
from @data.nodes('//book')as Tab(Col)
--17、获取所有book的所有信息
select
T.C.value('title[1]','varchar(max)') as title,
T.C.value('year[1]','int') as year,
T.C.value('title[1]','varchar(max)')as title,
T.C.value('price[1]','float') as price,
T.C.value('author[1]','varchar(max)') as author1,
T.C.value('author[2]','varchar(max)') as author2,
T.C.value('author[3]','varchar(max)') as author3,
T.C.value('author[4]','varchar(max)') as author4
from @data.nodes('//book') as T(C)
--18、获取不是日语(lang!="jp")且价格大于35的书的所有信息
select
T.C.value('title[1]','varchar(max)') as title,
T.C.value('year[1]','int') as year,
T.C.value('title[1]','varchar(max)')as title,
T.C.value('price[1]','float') as price,
T.C.value('author[1]','varchar(max)') as author1,
T.C.value('author[2]','varchar(max)') as author2,
T.C.value('author[3]','varchar(max)') as author3,
T.C.value('author[4]','varchar(max)') as author4
from @data.nodes('//book[./title[@lang!="jp"] and price>35 ]') as T(C)
set @xml='
<root xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<xsd:schema targetNamespace="urn:schemas-microsoft-com:sql:SqlRowSet1" xmlns:schema="urn:schemas-microsoft-com:sql:SqlRowSet1" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:sqltypes="http://schemas.microsoft.com/sqlserver/2004/sqltypes" elementFormDefault="qualified">
<xsd:import namespace="http://schemas.microsoft.com/sqlserver/2004/sqltypes" schemaLocation="http://schemas.microsoft.com/sqlserver/2004/sqltypes/sqltypes.xsd" />
<xsd:element name="ACCNOSET">
<xsd:complexType>
<xsd:sequence>
<xsd:element name="Id" type="sqltypes:int" nillable="1" />
<xsd:element name="Cate_Code" nillable="1">
<xsd:simpleType>
<xsd:restriction base="sqltypes:varchar" sqltypes:localeId="1028" sqltypes:sqlCompareOptions="IgnoreKanaType IgnoreWidth">
<xsd:maxLength value="10" />
</xsd:restriction>
</xsd:simpleType>
</xsd:element>
<xsd:element name="GP" nillable="1">
<xsd:simpleType>
<xsd:restriction base="sqltypes:varchar" sqltypes:localeId="1028" sqltypes:sqlCompareOptions="IgnoreKanaType IgnoreWidth">
<xsd:maxLength value="10" />
</xsd:restriction>
</xsd:simpleType>
</xsd:element>
<xsd:element name="COMPANY" nillable="1">
<xsd:simpleType>
<xsd:restriction base="sqltypes:varchar" sqltypes:localeId="1028" sqltypes:sqlCompareOptions="IgnoreKanaType IgnoreWidth">
<xsd:maxLength value="10" />
</xsd:restriction>
</xsd:simpleType>
</xsd:element>
<xsd:element name="DEPT" nillable="1">
<xsd:simpleType>
<xsd:restriction base="sqltypes:varchar" sqltypes:localeId="1028" sqltypes:sqlCompareOptions="IgnoreKanaType IgnoreWidth">
<xsd:maxLength value="10" />
</xsd:restriction>
</xsd:simpleType>
</xsd:element>
<xsd:element name="ACCNO_Start" nillable="1">
<xsd:simpleType>
<xsd:restriction base="sqltypes:varchar" sqltypes:localeId="1028" sqltypes:sqlCompareOptions="IgnoreKanaType IgnoreWidth">
<xsd:maxLength value="50" />
</xsd:restriction>
</xsd:simpleType>
</xsd:element>
<xsd:element name="ACCNO_End" nillable="1">
<xsd:simpleType>
<xsd:restriction base="sqltypes:varchar" sqltypes:localeId="1028" sqltypes:sqlCompareOptions="IgnoreKanaType IgnoreWidth">
<xsd:maxLength value="50" />
</xsd:restriction>
</xsd:simpleType>
</xsd:element>
<xsd:element name="UptDate" type="sqltypes:datetime" nillable="1" />
<xsd:element name="UPTUSER" nillable="1">
<xsd:simpleType>
<xsd:restriction base="sqltypes:varchar" sqltypes:localeId="1028" sqltypes:sqlCompareOptions="IgnoreKanaType IgnoreWidth">
<xsd:maxLength value="50" />
</xsd:restriction>
</xsd:simpleType>
</xsd:element>
</xsd:sequence>
</xsd:complexType>
</xsd:element>
</xsd:schema>
<ACCNOSET xmlns="urn:schemas-microsoft-com:sql:SqlRowSet1">
<Id>7</Id>
<Cate_Code>mi </Cate_Code>
<GP>C</GP>
<COMPANY>egat</COMPANY>
<DEPT>CegatB2000</DEPT>
<ACCNO_Start>2222</ACCNO_Start>
<ACCNO_End>2222</ACCNO_End>
<UptDate>2010-12-03T17:28:41</UptDate>
<UPTUSER>2222</UPTUSER>
</ACCNOSET>
<ACCNOSET xmlns="urn:schemas-microsoft-com:sql:SqlRowSet1">
<Id>8</Id>
<Cate_Code>mi </Cate_Code>
<GP>D</GP>
<COMPANY>eic</COMPANY>
<DEPT>Deic01000</DEPT>
<ACCNO_Start>4444</ACCNO_Start>
<ACCNO_End>4444</ACCNO_End>
<UptDate>2010-12-03T17:27:24</UptDate>
<UPTUSER>2222</UPTUSER>
</ACCNOSET>
<ACCNOSET xmlns="urn:schemas-microsoft-com:sql:SqlRowSet1">
<Id>9</Id>
<Cate_Code>pi </Cate_Code>
<GP>B</GP>
<COMPANY>eis</COMPANY>
<DEPT>BeisA2000</DEPT>
<ACCNO_Start>1111</ACCNO_Start>
<ACCNO_End>11111</ACCNO_End>
<UptDate>2010-12-03T17:27:53</UptDate>
<UPTUSER>2222</UPTUSER>
</ACCNOSET>
<ACCNOSET xmlns="urn:schemas-microsoft-com:sql:SqlRowSet1">
<Id>10</Id>
<Cate_Code>mi</Cate_Code>
<GP>C</GP>
<COMPANY>egat</COMPANY>
<DEPT>CegatB2000</DEPT>
<ACCNO_Start>9999</ACCNO_Start>
<ACCNO_End>999999</ACCNO_End>
<UptDate>2011-01-06T16:06:24</UptDate>
<UPTUSER>jim1</UPTUSER>
</ACCNOSET>
<ACCNOSET xmlns="urn:schemas-microsoft-com:sql:SqlRowSet1">
<Id>11</Id>
<Cate_Code>pi</Cate_Code>
<GP>B</GP>
<COMPANY>eis</COMPANY>
<DEPT>BeisA2000</DEPT>
<ACCNO_Start>1254846</ACCNO_Start>
<ACCNO_End>43654543</ACCNO_End>
<UptDate>2011-01-06T16:06:49</UptDate>
<UPTUSER>jim1</UPTUSER>
</ACCNOSET>
<ACCNOSET xmlns="urn:schemas-microsoft-com:sql:SqlRowSet1">
<Id>12</Id>
<Cate_Code>gi</Cate_Code>
<GP>C</GP>
<COMPANY>egat</COMPANY>
<DEPT>CegatB2000</DEPT>
<ACCNO_Start>4548</ACCNO_Start>
<ACCNO_End>4021</ACCNO_End>
<UptDate>2010-12-23T17:44:32</UptDate>
<UPTUSER>jim1</UPTUSER>
</ACCNOSET>
<ACCNOSET xmlns="urn:schemas-microsoft-com:sql:SqlRowSet1">
<Id>13</Id>
<Cate_Code>gi</Cate_Code>
<GP>D</GP>
<COMPANY>eic</COMPANY>
<DEPT>Deic01000</DEPT>
<ACCNO_Start>1232</ACCNO_Start>
<ACCNO_End>1562</ACCNO_End>
<UptDate>2010-12-23T19:49:09</UptDate>
<UPTUSER>jim1</UPTUSER>
</ACCNOSET>
<ACCNOSET xmlns="urn:schemas-microsoft-com:sql:SqlRowSet1">
<Id>14</Id>
<Cate_Code>gi</Cate_Code>
<GP>D</GP>
<COMPANY>eic</COMPANY>
<DEPT>Deic01000</DEPT>
<ACCNO_Start>10</ACCNO_Start>
<ACCNO_End>30</ACCNO_End>
<UptDate>2011-01-06T16:43:09</UptDate>
<UPTUSER>jim1</UPTUSER>
</ACCNOSET>
<ACCNOSET xmlns="urn:schemas-microsoft-com:sql:SqlRowSet1">
<Id>15</Id>
<Cate_Code>ma</Cate_Code>
<GP>C</GP>
<COMPANY>egat</COMPANY>
<DEPT>CegatB2000</DEPT>
<ACCNO_Start>100</ACCNO_Start>
<ACCNO_End>200</ACCNO_End>
<UptDate>2011-02-20T17:03:40</UptDate>
<UPTUSER>jim1</UPTUSER>
</ACCNOSET>
</root>'
使用这样去读取数据时,不能读到值
select B.v.query('text()') from @xml.nodes('root/ACCNOSET/*') B(v)