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Roel van der Hoeven

Subject: Outer joins
Author: Roel van der Hoeven
Date: 15 Oct 2012 04:38 AM

I'm having a bit of trouble with outer joins and calculating with output from them.

Lets say I have an XML ($input) with the following content:

<?xml version="1.0" encoding="UTF-8"?>
<some>
<path>
<list>
<listA>
<listType>A</listType>
<value1>3</value1>
<value2>0</value2>
<value3>5</value3>
<value4>2</value4>
</listA>
<listA>
<listType>B</listType>
<value1>1</value1>
<value2>2</value2>
<value3>3</value3>
<value4>2</value4>
</listA>
<listA>
<listType>C</listType>
<value1>2</value1>
<value2>2</value2>
<value3>0</value3>
<value4>1</value4>
</listA>
<listB>
<listType>A</listType>
<value1>3</value1>
<value2>0</value2>
<value3>5</value3>
<value4>2</value4>
</listB>
<listB>
<listType>B</listType>
<value1>1</value1>
<value2>2</value2>
<value3>3</value3>
<value4>2</value4>
</listB>
<listB>
<listType>C</listType>
<value1>2</value1>
<value2>2</value2>
<value3>0</value3>
<value4>1</value4>
</listB>
<listB>
<listType>D</listType>
<value1>2</value1>
<value2>2</value2>
<value3>0</value3>
<value4>1</value4>
</listB>
<listB>
<listType>E</listType>
<value1>2</value1>
<value2>2</value2>
<value3>0</value3>
<value4>1</value4>
</listB>
</list>
</path>
</some>

I want to loop over listA and listB and group them by listType. In the output I'll add the values together, so it'll be something like:

<some>
<path>
<list>
<listX>
<listType>[UniqueListType]</listType>
<value1>[sum(listA.value1 + listB.value1)]</value1>
<value2>[sum(listA.value2 + listB.value2)]</value2>
<value3>[sum(listA.value3 + listB.value3)]</value3>
<value4>[sum(listA.value4 + listB.value4)]</value4>
</listX>
</list>
</path>
</some>

Any thoughts?

Ivan Pedruzzi

Subject: Outer joins
Author: Ivan Pedruzzi
Date: 15 Oct 2012 10:26 AM

Hi Roel,

See if the following query helps

Ivan Pedruzzi
Stylus Studio Team

declare variable $input1 as document-node(element(*, xs:untyped)) external;

<some>
<path>
<list>
<listX>
{
for $listType in distinct-values($input1/some/path/list/*/listType)
return
let $listX := $input1/some/path/list/*[listType = $listType]
return
(<listType>{ $listType }</listType>,
for $value in $listX[1]/*[local-name() != 'listType'],
$name in name($value)
return element { $name } {sum($listX/*[name() = $name])})
}
</listX>
</list>
</path>
</some>

--------------------------------------
Result

<some>
<path>
<list>
<listX>
<listType>A</listType>
<value1>6</value1>
<value2>0</value2>
<value3>10</value3>
<value4>4</value4>
<listType>B</listType>
<value1>2</value1>
<value2>4</value2>
<value3>6</value3>
<value4>4</value4>
<listType>C</listType>
<value1>4</value1>
<value2>4</value2>
<value3>0</value3>
<value4>2</value4>
<listType>D</listType>
<value1>2</value1>
<value2>2</value2>
<value3>0</value3>
<value4>1</value4>
<listType>E</listType>
<value1>2</value1>
<value2>2</value2>
<value3>0</value3>
<value4>1</value4>
</listX>
</list>
</path>
</some>

Roel van der Hoeven

Subject: Outer joins
Author: Roel van der Hoeven
Date: 17 Oct 2012 04:16 AM

Ivan,

Thanks for your input. It has helped me a bit in understanding the base. Still I can't seem to get it to work in my situation. Attached is the actual input. The elements I need to loop over are in a loop with variable $xlCargoDetails called xlBerthVisitContainerHandling and xlBerthVisitFlatHandling. They have children xlEquipmentCategoryCode (key field), xlNumberFullEquipmentLoaded, xlNumberEmptyEquipmentLoaded, xlNumberFullEquipmentDischarged and xlNumberEmptyEquipmentDischarged.

This will have to be transformed in the output as berthVisitEquipmentHandling with children equipmentCategoryCode (the former key field), numberFullLoaded, numberEmptyLoaded, numberFullDischarged and numberEmptyDischarged.

Ivan Pedruzzi

Subject: Outer joins
Author: Ivan Pedruzzi
Date: 17 Oct 2012 04:08 PM

The following query does what you have described, it also outputs the input document structure

Hope this helps
Ivan Pedruzzi
Stylus Studio Team

declare variable $input1 as document-node(element(*, xs:untyped)) external;

<xlPortHarbourDuesStatement>
{
for $xlPortHarbourDuesStatement in $input1/xlPortHarbourDuesStatement
return
<xlPortHarbourDuesStatement>{
for $xlBerthInformation in $input1/xlPortHarbourDuesStatement/xlBerthInformation
return
<xlBerthInformation>{(
$xlBerthInformation/xlSequenceNumber,
for $xlCargoDetails in $xlBerthInformation/xlCargoDetails
return
<xlCargoDetails>{
for $xlEquipmentCategoryCode in distinct-values($xlCargoDetails/*/xlEquipmentCategoryCode)
return
let $xlBertVisitHandling := $xlCargoDetails/*[xlEquipmentCategoryCode = $xlEquipmentCategoryCode]
return
<berthVisitEquipmentHandling>
<equipmentCategoryCode>{$xlEquipmentCategoryCode}</equipmentCategoryCode>
<numberFullLoaded>{sum($xlBertVisitHandling/*[name() = "xlNumberFullEquipmentLoaded"])}</numberFullLoaded>
<numberEmptyLoaded>{sum($xlBertVisitHandling/*[name() = "xlNumberEmptyEquipmentLoaded"])}</numberEmptyLoaded>
<numberFullDischarged>{sum($xlBertVisitHandling/*[name() = "xlNumberFullEquipmentDischarged"])}</numberFullDischarged>
<numberEmptyDischarged>{sum($xlBertVisitHandling/*[name() = "xlNumberEmptyEquipmentDischarged"])}</numberEmptyDischarged>
</berthVisitEquipmentHandling >
}</xlCargoDetails>
)}</xlBerthInformation>
}</xlPortHarbourDuesStatement>
}
</xlPortHarbourDuesStatement>

------------------------------------
result

<xlPortHarbourDuesStatement>
<xlPortHarbourDuesStatement>
<xlBerthInformation>
<xlSequenceNumber>1</xlSequenceNumber>
<xlCargoDetails>
<berthVisitEquipmentHandling>
<equipmentCategoryCode>20FT</equipmentCategoryCode>
<numberFullLoaded>2</numberFullLoaded>
<numberEmptyLoaded>2</numberEmptyLoaded>
<numberFullDischarged>2</numberFullDischarged>
<numberEmptyDischarged>2</numberEmptyDischarged>
</berthVisitEquipmentHandling>
</xlCargoDetails>
</xlBerthInformation>
<xlBerthInformation>
<xlSequenceNumber>2</xlSequenceNumber>
<xlCargoDetails>
<berthVisitEquipmentHandling>
<equipmentCategoryCode>20FT</equipmentCategoryCode>
<numberFullLoaded>40</numberFullLoaded>
<numberEmptyLoaded>40</numberEmptyLoaded>
<numberFullDischarged>40</numberFullDischarged>
<numberEmptyDischarged>40</numberEmptyDischarged>
</berthVisitEquipmentHandling>
<berthVisitEquipmentHandling>
<equipmentCategoryCode>25FT</equipmentCategoryCode>
<numberFullLoaded>50</numberFullLoaded>
<numberEmptyLoaded>50</numberEmptyLoaded>
<numberFullDischarged>50</numberFullDischarged>
<numberEmptyDischarged>50</numberEmptyDischarged>
</berthVisitEquipmentHandling>
<berthVisitEquipmentHandling>
<equipmentCategoryCode>30FT</equipmentCategoryCode>
<numberFullLoaded>30</numberFullLoaded>
<numberEmptyLoaded>30</numberEmptyLoaded>
<numberFullDischarged>30</numberFullDischarged>
<numberEmptyDischarged>30</numberEmptyDischarged>
</berthVisitEquipmentHandling>
<berthVisitEquipmentHandling>
<equipmentCategoryCode>35FT</equipmentCategoryCode>
<numberFullLoaded>35</numberFullLoaded>
<numberEmptyLoaded>35</numberEmptyLoaded>
<numberFullDischarged>35</numberFullDischarged>
<numberEmptyDischarged>35</numberEmptyDischarged>
</berthVisitEquipmentHandling>
<berthVisitEquipmentHandling>
<equipmentCategoryCode>40FT</equipmentCategoryCode>
<numberFullLoaded>40</numberFullLoaded>
<numberEmptyLoaded>40</numberEmptyLoaded>
<numberFullDischarged>40</numberFullDischarged>
<numberEmptyDischarged>40</numberEmptyDischarged>
</berthVisitEquipmentHandling>
<berthVisitEquipmentHandling>
<equipmentCategoryCode>45FT</equipmentCategoryCode>
<numberFullLoaded>45</numberFullLoaded>
<numberEmptyLoaded>45</numberEmptyLoaded>
<numberFullDischarged>45</numberFullDischarged>
<numberEmptyDischarged>45</numberEmptyDischarged>
</berthVisitEquipmentHandling>
</xlCargoDetails>
</xlBerthInformation>
</xlPortHarbourDuesStatement>
</xlPortHarbourDuesStatement>

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