将嵌套XML解析为SQL表

Question

根据所需的布局(下面)将以下XML块解析为SQL Server表的正确方法是什么？是否可以使用单个SELECT语句,没有UNION或循环？任何接受者？提前致谢.输入XML:

<ObjectData>
  <Parameter1>some value</Parameter1>
  <Parameter2>other value</Parameter2>
  <Dates>
    <dateTime>2011-02-01T00:00:00</dateTime>
    <dateTime>2011-03-01T00:00:00</dateTime>
    <dateTime>2011-04-01T00:00:00</dateTime>
  </Dates>
  <Values>
    <double>0.019974</double>
    <double>0.005395</double>
    <double>0.004854</double>
  </Values>
  <Description>
    <string>this is row 1</string>
    <string>this is row 2</string>
    <string>this is row 3</string>
  </Values>
</ObjectData>

所需的表输出:

Parameter1  Parameter2      Dates               Values      Description

Some value  Other value 2011-02-01 00:00:00.0   0.019974    this is row 1
Some value  Other value 2011-03-01 00:00:00.0   0.005395    this is row 2
Some value  Other value 2011-04-01 00:00:00.0   0.004854    this is row 3

我在使用OPENXML或xml.nodes()功能的SELECT SQL语句之后.例如,以下SELECT语句导致值和日期之间的生成(即值和日期的所有排列),这是我想要避免的.

SELECT 
doc.col.value('Parameter1[1]', 'varchar(20)') Parameter1, 
doc.col.value('Parameter2[1]', 'varchar(20)') Parameter2, 
doc1.col.value('.', 'datetime') Dates ,
doc2.col.value('.', 'float') [Values] 
FROM 
@xml.nodes('/ObjectData') doc(col),
@xml.nodes('/ObjectData/Dates/dateTime') doc1(col),
@xml.nodes('/ObjectData/Values/double') doc2(col);

Answer 1

您可以使用数字表从子元素中选择第一行,第二行,第三行等.在此查询中,如果提供日期,我将限制返回到该数字的行.如果有比日期更多的值或描述,则必须修改联接以将其考虑在内.

declare @XML xml = '
<ObjectData>
  <Parameter1>some value</Parameter1>
  <Parameter2>other value</Parameter2>
  <Dates>
    <dateTime>2011-02-01T00:00:00</dateTime>
    <dateTime>2011-03-01T00:00:00</dateTime>
    <dateTime>2011-04-01T00:00:00</dateTime>
  </Dates>
  <Values>
    <double>0.019974</double>
    <double>0.005395</double>
    <double>0.004854</double>
  </Values>
  <Description>
    <string>this is row 1</string>
    <string>this is row 2</string>
    <string>this is row 3</string>
  </Description>
</ObjectData>'

;with Numbers as
(
  select number
  from master..spt_values
  where type = 'P'
)
select T.N.value('Parameter1[1]', 'varchar(50)') as Parameter1,
       T.N.value('Parameter2[1]', 'varchar(50)') as Parameter2,
       T.N.value('(Dates/dateTime[position()=sql:column("N.Number")])[1]', 'datetime') as Dates,
       T.N.value('(Values/double[position()=sql:column("N.Number")])[1]', 'float') as [Values],
       T.N.value('(Description/string[position()=sql:column("N.Number")])[1]', 'varchar(max)') as [Description]
from @XML.nodes('/ObjectData') as T(N)
  cross join Numbers as N
where N.number between 1 and (T.N.value('count(Dates/dateTime)', 'int'))