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



  • 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?



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



  • 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.



  • 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



  • 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.



  • [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...



  • 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...



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



  • @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


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