Xquery 查询以从关联 header 中检索值以获取详细信息
Xquery query to retreive values from associated header for detail
我有 XML，我可以从中检索值，但我正在使用的解决方案重复，该解决方案适用于不同的结构 XML。
XML
<del:DeliverMeterReading xmlns:del="http://schemas.fortum.com/amm/delivermeterreading">
<del:Header>
<del:MessageId>x</del:MessageId>
<del:MessageType>y</del:MessageType>
<del:MessageCreatedTimestamp>2021-10-27T22:10:25.362+00:00</del:MessageCreatedTimestamp>
<del:MessageReceivedTimestamp>2021-10-27T22:10:31+00:00</del:MessageReceivedTimestamp>
<del:DispatchId>z</del:DispatchId>
</del:Header>
<del:DataRows>
<del:Data>
<del:TaskTypeId>0</del:TaskTypeId>
<del:TaskId>1</del:TaskId>
<del:DeliverySiteEANCode>1</del:DeliverySiteEANCode>
<del:SvkCode>901</del:SvkCode>
<del:MeterId>-1</del:MeterId>
<del:DeliveryFormat>E</del:DeliveryFormat>
<del:ReadingStartDate>2021-08-28T00:00:00.000+00:00</del:ReadingStartDate>
<del:ReadingEndDate>2021-08-28T23:00:00.000+00:00</del:ReadingEndDate>
<del:Resolution>PT1H</del:Resolution>
<del:SpSla />
<del:RecordPosition>1</del:RecordPosition>
<del:Values>
<del:Value position="1" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T00:00:00.000+00:00" requestedReadingDate="2021-08-28T00:00:00.000+00:00" reading="96542.26" status="51" meterReadingId="1459846141" />
<del:Value position="2" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T01:00:00.000+00:00" requestedReadingDate="2021-08-28T01:00:00.000+00:00" reading="96542.54" status="51" meterReadingId="1459846142" />
<del:Value position="3" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T02:00:00.000+00:00" requestedReadingDate="2021-08-28T02:00:00.000+00:00" reading="96542.79" status="51" meterReadingId="1459846143" />
<del:Value position="4" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T03:00:00.000+00:00" requestedReadingDate="2021-08-28T03:00:00.000+00:00" reading="96543.06" status="51" meterReadingId="1459846144" />
<del:Value position="5" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T04:00:00.000+00:00" requestedReadingDate="2021-08-28T04:00:00.000+00:00" reading="96543.31" status="51" meterReadingId="1459846145" />
<del:Value position="6" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T05:00:00.000+00:00" requestedReadingDate="2021-08-28T05:00:00.000+00:00" reading="96543.58" status="51" meterReadingId="1459846146" />
<del:Value position="7" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T06:00:00.000+00:00" requestedReadingDate="2021-08-28T06:00:00.000+00:00" reading="96543.99" status="51" meterReadingId="1459846147" />
<del:Value position="8" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T07:00:00.000+00:00" requestedReadingDate="2021-08-28T07:00:00.000+00:00" reading="96544.43" status="51" meterReadingId="1459846148" />
<del:Value position="9" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T08:00:00.000+00:00" requestedReadingDate="2021-08-28T08:00:00.000+00:00" reading="96544.89" status="51" meterReadingId="1459846149" />
<del:Value position="10" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T09:00:00.000+00:00" requestedReadingDate="2021-08-28T09:00:00.000+00:00" reading="96545.29" status="51" meterReadingId="1459846150" />
<del:Value position="11" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T10:00:00.000+00:00" requestedReadingDate="2021-08-28T10:00:00.000+00:00" reading="96546.02" status="51" meterReadingId="1459846151" />
<del:Value position="12" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T11:00:00.000+00:00" requestedReadingDate="2021-08-28T11:00:00.000+00:00" reading="96547.37" status="51" meterReadingId="1459846152" />
<del:Value position="13" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T12:00:00.000+00:00" requestedReadingDate="2021-08-28T12:00:00.000+00:00" reading="96548.04" status="51" meterReadingId="1459846153" />
<del:Value position="14" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T13:00:00.000+00:00" requestedReadingDate="2021-08-28T13:00:00.000+00:00" reading="96549.92" status="51" meterReadingId="1459846154" />
<del:Value position="15" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T14:00:00.000+00:00" requestedReadingDate="2021-08-28T14:00:00.000+00:00" reading="96550.69" status="51" meterReadingId="1459846155" />
<del:Value position="16" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T15:00:00.000+00:00" requestedReadingDate="2021-08-28T15:00:00.000+00:00" reading="96551.69" status="51" meterReadingId="1459846156" />
<del:Value position="17" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T16:00:00.000+00:00" requestedReadingDate="2021-08-28T16:00:00.000+00:00" reading="96553.68" status="51" meterReadingId="1459846157" />
<del:Value position="18" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T17:00:00.000+00:00" requestedReadingDate="2021-08-28T17:00:00.000+00:00" reading="96555.07" status="51" meterReadingId="1459846158" />
<del:Value position="19" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T18:00:00.000+00:00" requestedReadingDate="2021-08-28T18:00:00.000+00:00" reading="96557.56" status="51" meterReadingId="1459846159" />
<del:Value position="20" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T19:00:00.000+00:00" requestedReadingDate="2021-08-28T19:00:00.000+00:00" reading="96558.36" status="51" meterReadingId="1459846160" />
<del:Value position="21" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T20:00:00.000+00:00" requestedReadingDate="2021-08-28T20:00:00.000+00:00" reading="96559.01" status="51" meterReadingId="1459846161" />
<del:Value position="22" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T21:00:00.000+00:00" requestedReadingDate="2021-08-28T21:00:00.000+00:00" reading="96559.82" status="51" meterReadingId="1459846162" />
<del:Value position="23" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T22:00:00.000+00:00" requestedReadingDate="2021-08-28T22:00:00.000+00:00" reading="96560.44" status="51" meterReadingId="1459846163" />
<del:Value position="24" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T23:00:00.000+00:00" requestedReadingDate="2021-08-28T23:00:00.000+00:00" reading="96560.83" status="51" meterReadingId="1459846164" />
</del:Values>
</del:Data>
<del:Data>
<del:TaskTypeId>0</del:TaskTypeId>
<del:TaskId>2</del:TaskId>
<del:DeliverySiteEANCode>2</del:DeliverySiteEANCode>
<del:SvkCode>901</del:SvkCode>
<del:MeterId>-1</del:MeterId>
<del:DeliveryFormat>E</del:DeliveryFormat>
<del:ReadingStartDate>2021-08-28T00:00:00.000+00:00</del:ReadingStartDate>
<del:ReadingEndDate>2021-08-28T23:00:00.000+00:00</del:ReadingEndDate>
<del:Resolution>PT1H</del:Resolution>
<del:SpSla />
<del:RecordPosition>2</del:RecordPosition>
<del:Values>
<del:Value position="1" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T00:00:00.000+00:00" requestedReadingDate="2021-08-28T00:00:00.000+00:00" reading="126748.93" status="50" meterReadingId="1459846165" />
<del:Value position="2" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T01:00:00.000+00:00" requestedReadingDate="2021-08-28T01:00:00.000+00:00" reading="126749.71" status="50" meterReadingId="1459846166" />
<del:Value position="3" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T02:00:00.000+00:00" requestedReadingDate="2021-08-28T02:00:00.000+00:00" reading="126750.49" status="50" meterReadingId="1459846167" />
<del:Value position="4" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T03:00:00.000+00:00" requestedReadingDate="2021-08-28T03:00:00.000+00:00" reading="126751.27" status="50" meterReadingId="1459846168" />
<del:Value position="5" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T04:00:00.000+00:00" requestedReadingDate="2021-08-28T04:00:00.000+00:00" reading="126752.06" status="50" meterReadingId="1459846169" />
<del:Value position="6" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T05:00:00.000+00:00" requestedReadingDate="2021-08-28T05:00:00.000+00:00" reading="126752.84" status="50" meterReadingId="1459846170" />
<del:Value position="7" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T06:00:00.000+00:00" requestedReadingDate="2021-08-28T06:00:00.000+00:00" reading="126753.62" status="50" meterReadingId="1459846171" />
<del:Value position="8" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T07:00:00.000+00:00" requestedReadingDate="2021-08-28T07:00:00.000+00:00" reading="126754.4" status="50" meterReadingId="1459846172" />
<del:Value position="9" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T08:00:00.000+00:00" requestedReadingDate="2021-08-28T08:00:00.000+00:00" reading="126755.18" status="50" meterReadingId="1459846173" />
<del:Value position="10" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T09:00:00.000+00:00" requestedReadingDate="2021-08-28T09:00:00.000+00:00" reading="126755.96" status="50" meterReadingId="1459846174" />
<del:Value position="11" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T10:00:00.000+00:00" requestedReadingDate="2021-08-28T10:00:00.000+00:00" reading="126756.74" status="50" meterReadingId="1459846175" />
<del:Value position="12" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T11:00:00.000+00:00" requestedReadingDate="2021-08-28T11:00:00.000+00:00" reading="126757.52" status="50" meterReadingId="1459846176" />
<del:Value position="13" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T12:00:00.000+00:00" requestedReadingDate="2021-08-28T12:00:00.000+00:00" reading="126758.3" status="50" meterReadingId="1459846177" />
<del:Value position="14" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T13:00:00.000+00:00" requestedReadingDate="2021-08-28T13:00:00.000+00:00" reading="126759.08" status="50" meterReadingId="1459846178" />
<del:Value position="15" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T14:00:00.000+00:00" requestedReadingDate="2021-08-28T14:00:00.000+00:00" reading="126759.86" status="50" meterReadingId="1459846179" />
<del:Value position="16" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T15:00:00.000+00:00" requestedReadingDate="2021-08-28T15:00:00.000+00:00" reading="126760.64" status="50" meterReadingId="1459846180" />
<del:Value position="17" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T16:00:00.000+00:00" requestedReadingDate="2021-08-28T16:00:00.000+00:00" reading="126761.42" status="50" meterReadingId="1459846181" />
<del:Value position="18" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T17:00:00.000+00:00" requestedReadingDate="2021-08-28T17:00:00.000+00:00" reading="126762.2" status="50" meterReadingId="1459846182" />
<del:Value position="19" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T18:00:00.000+00:00" requestedReadingDate="2021-08-28T18:00:00.000+00:00" reading="126762.98" status="50" meterReadingId="1459846183" />
<del:Value position="20" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T19:00:00.000+00:00" requestedReadingDate="2021-08-28T19:00:00.000+00:00" reading="126763.76" status="50" meterReadingId="1459846184" />
<del:Value position="21" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T20:00:00.000+00:00" requestedReadingDate="2021-08-28T20:00:00.000+00:00" reading="126764.54" status="50" meterReadingId="1459846185" />
<del:Value position="22" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T21:00:00.000+00:00" requestedReadingDate="2021-08-28T21:00:00.000+00:00" reading="126765.32" status="50" meterReadingId="1459846186" />
<del:Value position="23" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T22:00:00.000+00:00" requestedReadingDate="2021-08-28T22:00:00.000+00:00" reading="126766.1" status="50" meterReadingId="1459846187" />
<del:Value position="24" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T23:00:00.000+00:00" requestedReadingDate="2021-08-28T23:00:00.000+00:00" reading="126766.88" status="50" meterReadingId="1459846188" />
</del:Values>
</del:Data>
</del:DataRows>
</del:DeliverMeterReading>
查询
WITH XMLNAMESPACES(DEFAULT N'http://schemas.fortum.com/amm/delivermeterreading')
SELECT DISTINCT
t.file_name, t.file_created_time received_timestamp
,h.value(N'(Header/MessageCreatedTimestamp)[1]', 'varchar(40)') as created_timestamp
,h.value(N'(Header/DispatchId)[1]', 'varchar(40)') as dispatch_id
,d.value(N'(DeliverySiteEANCode)[1]', 'varchar(40)') ean
--,d.value(N'(ReadingStartDate)[1]', 'varchar(40)') ReadingStartDate
--,d.value(N'(TaskId)[1]', 'varchar(40)') taskid
--,d.value(N'(RecordPosition)[1]', 'varchar(40)') RecordPosition
,v.value(N'@position','varchar(35)') position
,v.value(N'@reading','varchar(35)') reading
,v.value(N'@status','varchar(35)') status
FROM
load.t t
OUTER APPLY
t.xml_data.nodes('/DeliverMeterReading') AS h(h)
OUTER APPLY
t.xml_data.nodes('/DeliverMeterReading/DataRows/Data') AS delsite(d)
OUTER APPLY
d.nodes('/Values') AS readings(v)
读数应用的目的是尝试通过获取与每个 del:DeliverySiteEANCode 关联的值来进行一些相关应用。我只需要这样做，因为否则我会得到一些笛卡尔积或其他东西，所以它无法匹配我检索到 del:DeliverySiteEANCode 这些值所属的值。如果有某种方法可以在 XML 层次结构中向上遍历以检索值，那就太好了。这样我就可以从最细粒度的级别开始，并附上该详细信息的 header 信息。因此，在这种情况下，当检索 Value position = "1" 时，我还连接了 del:DeliverySiteEANCode。
使用 SQL 服务器 2019。
你有两个错误：
/Values 您是从根开始的。如果您取消 / 它将从当前 Data 节点开始 - 您不会再次下降到
Value 个节点
所以你应该
OUTER APPLY
d.nodes('Values/Value') AS readings(v)
这里还有其他效率：
- 向每个
.value 添加 /text() 会提高性能（不要对 @ 属性执行此操作）
- 第一个
.nodes应该直接引用Header节点
DISTINCT 有性能成本。不要只是在查询中删除 DISTINCT 以消除重复项，首先要考虑它们是如何到达那里的。
WITH XMLNAMESPACES(DEFAULT N'http://schemas.fortum.com/amm/delivermeterreading')
SELECT
h.value(N'(MessageCreatedTimestamp/text())[1]', 'varchar(40)') as created_timestamp
,h.value(N'(DispatchId/text())[1]', 'varchar(40)') as dispatch_id
,d.value(N'(DeliverySiteEANCode/text())[1]', 'varchar(40)') ean
--,d.value(N'(ReadingStartDate/text())[1]', 'varchar(40)') ReadingStartDate
--,d.value(N'(TaskId/text())[1]', 'varchar(40)') taskid
--,d.value(N'(RecordPosition/text())[1]', 'varchar(40)') RecordPosition
,v.value(N'@position','varchar(35)') position
,v.value(N'@reading','varchar(35)') reading
,v.value(N'@status','varchar(35)') status
FROM
dbo.t t
OUTER APPLY
t.xml_data.nodes('/DeliverMeterReading/Header') AS h(h)
OUTER APPLY
t.xml_data.nodes('/DeliverMeterReading/DataRows/Data') AS delsite(d)
OUTER APPLY
delsite.d.nodes('Values/Value') AS readings(v)
我有 XML，我可以从中检索值，但我正在使用的解决方案重复，该解决方案适用于不同的结构 XML。
XML
<del:DeliverMeterReading xmlns:del="http://schemas.fortum.com/amm/delivermeterreading">
<del:Header>
<del:MessageId>x</del:MessageId>
<del:MessageType>y</del:MessageType>
<del:MessageCreatedTimestamp>2021-10-27T22:10:25.362+00:00</del:MessageCreatedTimestamp>
<del:MessageReceivedTimestamp>2021-10-27T22:10:31+00:00</del:MessageReceivedTimestamp>
<del:DispatchId>z</del:DispatchId>
</del:Header>
<del:DataRows>
<del:Data>
<del:TaskTypeId>0</del:TaskTypeId>
<del:TaskId>1</del:TaskId>
<del:DeliverySiteEANCode>1</del:DeliverySiteEANCode>
<del:SvkCode>901</del:SvkCode>
<del:MeterId>-1</del:MeterId>
<del:DeliveryFormat>E</del:DeliveryFormat>
<del:ReadingStartDate>2021-08-28T00:00:00.000+00:00</del:ReadingStartDate>
<del:ReadingEndDate>2021-08-28T23:00:00.000+00:00</del:ReadingEndDate>
<del:Resolution>PT1H</del:Resolution>
<del:SpSla />
<del:RecordPosition>1</del:RecordPosition>
<del:Values>
<del:Value position="1" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T00:00:00.000+00:00" requestedReadingDate="2021-08-28T00:00:00.000+00:00" reading="96542.26" status="51" meterReadingId="1459846141" />
<del:Value position="2" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T01:00:00.000+00:00" requestedReadingDate="2021-08-28T01:00:00.000+00:00" reading="96542.54" status="51" meterReadingId="1459846142" />
<del:Value position="3" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T02:00:00.000+00:00" requestedReadingDate="2021-08-28T02:00:00.000+00:00" reading="96542.79" status="51" meterReadingId="1459846143" />
<del:Value position="4" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T03:00:00.000+00:00" requestedReadingDate="2021-08-28T03:00:00.000+00:00" reading="96543.06" status="51" meterReadingId="1459846144" />
<del:Value position="5" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T04:00:00.000+00:00" requestedReadingDate="2021-08-28T04:00:00.000+00:00" reading="96543.31" status="51" meterReadingId="1459846145" />
<del:Value position="6" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T05:00:00.000+00:00" requestedReadingDate="2021-08-28T05:00:00.000+00:00" reading="96543.58" status="51" meterReadingId="1459846146" />
<del:Value position="7" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T06:00:00.000+00:00" requestedReadingDate="2021-08-28T06:00:00.000+00:00" reading="96543.99" status="51" meterReadingId="1459846147" />
<del:Value position="8" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T07:00:00.000+00:00" requestedReadingDate="2021-08-28T07:00:00.000+00:00" reading="96544.43" status="51" meterReadingId="1459846148" />
<del:Value position="9" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T08:00:00.000+00:00" requestedReadingDate="2021-08-28T08:00:00.000+00:00" reading="96544.89" status="51" meterReadingId="1459846149" />
<del:Value position="10" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T09:00:00.000+00:00" requestedReadingDate="2021-08-28T09:00:00.000+00:00" reading="96545.29" status="51" meterReadingId="1459846150" />
<del:Value position="11" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T10:00:00.000+00:00" requestedReadingDate="2021-08-28T10:00:00.000+00:00" reading="96546.02" status="51" meterReadingId="1459846151" />
<del:Value position="12" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T11:00:00.000+00:00" requestedReadingDate="2021-08-28T11:00:00.000+00:00" reading="96547.37" status="51" meterReadingId="1459846152" />
<del:Value position="13" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T12:00:00.000+00:00" requestedReadingDate="2021-08-28T12:00:00.000+00:00" reading="96548.04" status="51" meterReadingId="1459846153" />
<del:Value position="14" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T13:00:00.000+00:00" requestedReadingDate="2021-08-28T13:00:00.000+00:00" reading="96549.92" status="51" meterReadingId="1459846154" />
<del:Value position="15" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T14:00:00.000+00:00" requestedReadingDate="2021-08-28T14:00:00.000+00:00" reading="96550.69" status="51" meterReadingId="1459846155" />
<del:Value position="16" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T15:00:00.000+00:00" requestedReadingDate="2021-08-28T15:00:00.000+00:00" reading="96551.69" status="51" meterReadingId="1459846156" />
<del:Value position="17" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T16:00:00.000+00:00" requestedReadingDate="2021-08-28T16:00:00.000+00:00" reading="96553.68" status="51" meterReadingId="1459846157" />
<del:Value position="18" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T17:00:00.000+00:00" requestedReadingDate="2021-08-28T17:00:00.000+00:00" reading="96555.07" status="51" meterReadingId="1459846158" />
<del:Value position="19" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T18:00:00.000+00:00" requestedReadingDate="2021-08-28T18:00:00.000+00:00" reading="96557.56" status="51" meterReadingId="1459846159" />
<del:Value position="20" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T19:00:00.000+00:00" requestedReadingDate="2021-08-28T19:00:00.000+00:00" reading="96558.36" status="51" meterReadingId="1459846160" />
<del:Value position="21" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T20:00:00.000+00:00" requestedReadingDate="2021-08-28T20:00:00.000+00:00" reading="96559.01" status="51" meterReadingId="1459846161" />
<del:Value position="22" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T21:00:00.000+00:00" requestedReadingDate="2021-08-28T21:00:00.000+00:00" reading="96559.82" status="51" meterReadingId="1459846162" />
<del:Value position="23" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T22:00:00.000+00:00" requestedReadingDate="2021-08-28T22:00:00.000+00:00" reading="96560.44" status="51" meterReadingId="1459846163" />
<del:Value position="24" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T23:00:00.000+00:00" requestedReadingDate="2021-08-28T23:00:00.000+00:00" reading="96560.83" status="51" meterReadingId="1459846164" />
</del:Values>
</del:Data>
<del:Data>
<del:TaskTypeId>0</del:TaskTypeId>
<del:TaskId>2</del:TaskId>
<del:DeliverySiteEANCode>2</del:DeliverySiteEANCode>
<del:SvkCode>901</del:SvkCode>
<del:MeterId>-1</del:MeterId>
<del:DeliveryFormat>E</del:DeliveryFormat>
<del:ReadingStartDate>2021-08-28T00:00:00.000+00:00</del:ReadingStartDate>
<del:ReadingEndDate>2021-08-28T23:00:00.000+00:00</del:ReadingEndDate>
<del:Resolution>PT1H</del:Resolution>
<del:SpSla />
<del:RecordPosition>2</del:RecordPosition>
<del:Values>
<del:Value position="1" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T00:00:00.000+00:00" requestedReadingDate="2021-08-28T00:00:00.000+00:00" reading="126748.93" status="50" meterReadingId="1459846165" />
<del:Value position="2" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T01:00:00.000+00:00" requestedReadingDate="2021-08-28T01:00:00.000+00:00" reading="126749.71" status="50" meterReadingId="1459846166" />
<del:Value position="3" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T02:00:00.000+00:00" requestedReadingDate="2021-08-28T02:00:00.000+00:00" reading="126750.49" status="50" meterReadingId="1459846167" />
<del:Value position="4" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T03:00:00.000+00:00" requestedReadingDate="2021-08-28T03:00:00.000+00:00" reading="126751.27" status="50" meterReadingId="1459846168" />
<del:Value position="5" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T04:00:00.000+00:00" requestedReadingDate="2021-08-28T04:00:00.000+00:00" reading="126752.06" status="50" meterReadingId="1459846169" />
<del:Value position="6" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T05:00:00.000+00:00" requestedReadingDate="2021-08-28T05:00:00.000+00:00" reading="126752.84" status="50" meterReadingId="1459846170" />
<del:Value position="7" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T06:00:00.000+00:00" requestedReadingDate="2021-08-28T06:00:00.000+00:00" reading="126753.62" status="50" meterReadingId="1459846171" />
<del:Value position="8" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T07:00:00.000+00:00" requestedReadingDate="2021-08-28T07:00:00.000+00:00" reading="126754.4" status="50" meterReadingId="1459846172" />
<del:Value position="9" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T08:00:00.000+00:00" requestedReadingDate="2021-08-28T08:00:00.000+00:00" reading="126755.18" status="50" meterReadingId="1459846173" />
<del:Value position="10" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T09:00:00.000+00:00" requestedReadingDate="2021-08-28T09:00:00.000+00:00" reading="126755.96" status="50" meterReadingId="1459846174" />
<del:Value position="11" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T10:00:00.000+00:00" requestedReadingDate="2021-08-28T10:00:00.000+00:00" reading="126756.74" status="50" meterReadingId="1459846175" />
<del:Value position="12" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T11:00:00.000+00:00" requestedReadingDate="2021-08-28T11:00:00.000+00:00" reading="126757.52" status="50" meterReadingId="1459846176" />
<del:Value position="13" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T12:00:00.000+00:00" requestedReadingDate="2021-08-28T12:00:00.000+00:00" reading="126758.3" status="50" meterReadingId="1459846177" />
<del:Value position="14" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T13:00:00.000+00:00" requestedReadingDate="2021-08-28T13:00:00.000+00:00" reading="126759.08" status="50" meterReadingId="1459846178" />
<del:Value position="15" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T14:00:00.000+00:00" requestedReadingDate="2021-08-28T14:00:00.000+00:00" reading="126759.86" status="50" meterReadingId="1459846179" />
<del:Value position="16" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T15:00:00.000+00:00" requestedReadingDate="2021-08-28T15:00:00.000+00:00" reading="126760.64" status="50" meterReadingId="1459846180" />
<del:Value position="17" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T16:00:00.000+00:00" requestedReadingDate="2021-08-28T16:00:00.000+00:00" reading="126761.42" status="50" meterReadingId="1459846181" />
<del:Value position="18" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T17:00:00.000+00:00" requestedReadingDate="2021-08-28T17:00:00.000+00:00" reading="126762.2" status="50" meterReadingId="1459846182" />
<del:Value position="19" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T18:00:00.000+00:00" requestedReadingDate="2021-08-28T18:00:00.000+00:00" reading="126762.98" status="50" meterReadingId="1459846183" />
<del:Value position="20" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T19:00:00.000+00:00" requestedReadingDate="2021-08-28T19:00:00.000+00:00" reading="126763.76" status="50" meterReadingId="1459846184" />
<del:Value position="21" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T20:00:00.000+00:00" requestedReadingDate="2021-08-28T20:00:00.000+00:00" reading="126764.54" status="50" meterReadingId="1459846185" />
<del:Value position="22" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T21:00:00.000+00:00" requestedReadingDate="2021-08-28T21:00:00.000+00:00" reading="126765.32" status="50" meterReadingId="1459846186" />
<del:Value position="23" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T22:00:00.000+00:00" requestedReadingDate="2021-08-28T22:00:00.000+00:00" reading="126766.1" status="50" meterReadingId="1459846187" />
<del:Value position="24" registrationDate="2021-10-27T22:01:51.000+00:00" readingDate="2021-08-28T23:00:00.000+00:00" requestedReadingDate="2021-08-28T23:00:00.000+00:00" reading="126766.88" status="50" meterReadingId="1459846188" />
</del:Values>
</del:Data>
</del:DataRows>
</del:DeliverMeterReading>
查询
WITH XMLNAMESPACES(DEFAULT N'http://schemas.fortum.com/amm/delivermeterreading')
SELECT DISTINCT
t.file_name, t.file_created_time received_timestamp
,h.value(N'(Header/MessageCreatedTimestamp)[1]', 'varchar(40)') as created_timestamp
,h.value(N'(Header/DispatchId)[1]', 'varchar(40)') as dispatch_id
,d.value(N'(DeliverySiteEANCode)[1]', 'varchar(40)') ean
--,d.value(N'(ReadingStartDate)[1]', 'varchar(40)') ReadingStartDate
--,d.value(N'(TaskId)[1]', 'varchar(40)') taskid
--,d.value(N'(RecordPosition)[1]', 'varchar(40)') RecordPosition
,v.value(N'@position','varchar(35)') position
,v.value(N'@reading','varchar(35)') reading
,v.value(N'@status','varchar(35)') status
FROM
load.t t
OUTER APPLY
t.xml_data.nodes('/DeliverMeterReading') AS h(h)
OUTER APPLY
t.xml_data.nodes('/DeliverMeterReading/DataRows/Data') AS delsite(d)
OUTER APPLY
d.nodes('/Values') AS readings(v)
读数应用的目的是尝试通过获取与每个 del:DeliverySiteEANCode 关联的值来进行一些相关应用。我只需要这样做，因为否则我会得到一些笛卡尔积或其他东西，所以它无法匹配我检索到 del:DeliverySiteEANCode 这些值所属的值。如果有某种方法可以在 XML 层次结构中向上遍历以检索值，那就太好了。这样我就可以从最细粒度的级别开始，并附上该详细信息的 header 信息。因此，在这种情况下，当检索 Value position = "1" 时，我还连接了 del:DeliverySiteEANCode。
使用 SQL 服务器 2019。
你有两个错误：
/Values您是从根开始的。如果您取消/它将从当前Data节点开始- 您不会再次下降到
Value个节点
所以你应该
OUTER APPLY
d.nodes('Values/Value') AS readings(v)
这里还有其他效率：
- 向每个
.value添加/text()会提高性能（不要对@属性执行此操作） - 第一个
.nodes应该直接引用Header节点 DISTINCT有性能成本。不要只是在查询中删除DISTINCT以消除重复项，首先要考虑它们是如何到达那里的。
WITH XMLNAMESPACES(DEFAULT N'http://schemas.fortum.com/amm/delivermeterreading')
SELECT
h.value(N'(MessageCreatedTimestamp/text())[1]', 'varchar(40)') as created_timestamp
,h.value(N'(DispatchId/text())[1]', 'varchar(40)') as dispatch_id
,d.value(N'(DeliverySiteEANCode/text())[1]', 'varchar(40)') ean
--,d.value(N'(ReadingStartDate/text())[1]', 'varchar(40)') ReadingStartDate
--,d.value(N'(TaskId/text())[1]', 'varchar(40)') taskid
--,d.value(N'(RecordPosition/text())[1]', 'varchar(40)') RecordPosition
,v.value(N'@position','varchar(35)') position
,v.value(N'@reading','varchar(35)') reading
,v.value(N'@status','varchar(35)') status
FROM
dbo.t t
OUTER APPLY
t.xml_data.nodes('/DeliverMeterReading/Header') AS h(h)
OUTER APPLY
t.xml_data.nodes('/DeliverMeterReading/DataRows/Data') AS delsite(d)
OUTER APPLY
delsite.d.nodes('Values/Value') AS readings(v)