How can i save data (with the same tag) from an xml to a qmap?

[annatz]

the xml is:

@<patient id="1">
<name>George</name>
<surname>Papadakis</surname>
<birthdate><d>2</d><m>5</m><y>1954</y></birthdate>
<admission_date><d>17</d><m>4</m><y>2010</y></admission_date>
<clinical_department>A' Xeirourgiki Kliniki</clinical_department>
<ward>302</ward>
<bed>3</bed>
<primary_diagnosis>
<icd9_code>155.0</icd9_code>
<icd9_explanation>Malignant neoplasm of liver, primary</icd9_explanation>
</primary_diagnosis>
<surgical_operations>
<operation>
<oper_date><d>20</d><m>4</m><y>2010</y></oper_date>
<description>meriki ektomi hpatos</description>
</operation>
<operation>
<oper_date><d>27</d><m>4</m><y>2010</y></oper_date>
<description>neoplasm of liver</description>
</operation>
</surgical_operations>
</patient>@

@
void QXSRExample::parseSurgicalOperations(QXmlStreamReader& xml,QMap <QString,QString>& map) {
while(!(xml.tokenType() == QXmlStreamReader::EndElement
&& xml.name() == "operations")) {
if (xml.name()=="oper_date"){
oper_date=parseDate(xml);
map.insert(xml.name().toString(), oper_date);
}
if(xml.name() == "description"){
descr=xml.readElementText();
map.insert(xml.name().toString(), descr);
}
xml.readNext();
}
}
@

I have created the above function parseSurgicalOperations, in which I read the above xml file and I save the elements in a qmap. The xml has two operations and may have more. I want to read the operations and save them in the map, but each operation has the same tags (oper_date and description). How can I save them in the map?

[andre]

I would say that you need a different data structure than a map...

[JohanSolo]

Andre is right, a map is not what you want in this case.
You may want to try something like :
@
struct OperationData
{
string oper_date;
string descr;
};

vector< OperationData > operations;
@

and then use the operations container instead of your map. Of course this is a crude example, one can imagine to use a class instead of a struct for OperationData.

[annatz]

My whole program uses a qlist with qmap which contains all the patients with their data. When i search to find a specific patient how could i get the operation data? Is there another way to save the operation data in the qlist qmap? I think the struct doesnt help

[JohanSolo]

OK, then you may use the patient's name as the key of your QMap, and then a QMultimap for the operations data.. like this :

@
QMap< QString, QMultiMap< QString, QString > > container;
@
with such a structure, I think you have what you need : you can easily look for a patient, and then have access to the (possibly multiple) operation data.
But since in your XML snippet it seems that you have oper_date and description element nodes with a operation parent, you may want to add a class Operation, with data and description fields, so that your container can read :

@
class Operation;

QMap< QString, Operation > container;
@

I see a problem if you blindly us a QMap, for you won't be able to link the date and description of the operation.

[goetz]

[quote author="annatz" date="1302847166"]My whole program uses a qlist with qmap which contains all the patients with their data.[/quote]

This sounds like a serious design flaw. I strongly recommend you re-think this!

Or do you really want to use constructs like

@QMap< QString, QMultiMap< QString, QString > > container;@

?

Where nothing is typed and no one ever knows what's where (think of yourself and your fellow prorammers - will eventually have to change the program in a couple of years!)

Make distinct classes for your distinct entity types. That's what C++ is made for, not for creating arbitrary nested stacks of lists and maps...

[andre]

To make it real "fun", considder using a QMap< QString, QVariant > as a container. You can put anything you want in that QVariant, including new QMaps and QLists! How is that for fun! :-)

/me runs and hides...

[annatz]

thanks. I solved the problem. I used a QMultiMap.

[zabdielfer]

@annatz Hi:

how did you use qmultimap for resolve your problem? at this moment , I am in that issue, i don't know how I will resolve that writing qmap into xmlFile. thanks