Databases
StackOverflow2013
Postsdbo
POJava - Jena API - Output file
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POJava - Jena API - Output file
    primarykey
    data
    text
    <p>I'm using Java and Jena API.</p> <p>I have a class <code>Person</code> with the datatype properties <code>hasFirstName</code>, <code>hasLastName</code>, <code>hasDateOfBirth</code>, <code>hasGender</code>.</p> <p>Here is how one person is represented in my RDF file.</p> <pre><code>&lt;rdf:Description rdf:about="http://www.fam.com/FAM#Bruno04/02/1980 "&gt; &lt;j.0:FAMhasGender&gt;H&lt;/j.0:FAMhasGender&gt; &lt;j.0:FAMhasDateOfBirth&gt;04/02/1980&lt;/j.0:FAMhasDateOfBirth&gt; &lt;j.0:FAMhasLastName&gt;DS &lt;/j.0:FAMhasLastName&gt; &lt;j.0:FAMhasFirstName&gt; Bruno&lt;/j.0:FAMhasFirstName&gt; &lt;/rdf:Description&gt; </code></pre> <p>For each person whose gender is <strong>female</strong> I want to generate a text file with this line below:</p> <pre><code>[label= \"" +firstName+ " \"\n\n\"D.Naiss:"+dnai1+"\", "+shape2+"] </code></pre> <p>so if there is, for example, 3 females the file must contain 3 lines with that format. The shape value( and then the output line) will depend on the gender, that's why i cannot not use the same line for both genders.</p> <p>For each person whose gender is <strong>male</strong> I want to output this line below:</p> <pre><code>[label= \"" +firstName+ " \"\n\n\"D.Naiss:"+dnai1+"\", "+**shape**+"] </code></pre> <p>The problem I have is that in the output file i only see one woman and one man with the corresponding line. I have more than one woman and man but he only outputs one for each gender. That's my problem... </p> <p>Here is the relevant code:</p> <pre><code>public void accessProp() { readFile(inputFile); // rdf String fname; String dd; String gen; ExtendedIterator instances = onto.person.listInstances(); Individual instance = null; Individual firstInstance = null; while (instances.hasNext()) { instance = (Individual) instances.next(); gen = instance.getPropertyValue(onto.hasGender).toString(); fname = instance.getPropertyValue(onto.hasFirstName).toString(); dd = instance.getPropertyValue(onto.hasDateOfBirth).toString(); writeFile(fname, dd, genr); } } // Write text file public void writeFile(String fn, String dbir, String gn) { String fileout = "D:/file1.txt"; String firstName = fn; String dateB = dbir; String gender = gn; BufferedWriter out; try { out = new BufferedWriter(new FileWriter(fileout, true)); if (gender.equals("F")) { out.write("[label= \"" + firstName + " \"\n\n\"D.Naiss:" + dnai1 + "\", " + shape + "]"); } else if (gender.equals("M")) { out.write("[label= \"" + firstName + " \"\n\n\"D.Naiss:" + dnai1 + "\", " + shape2 + "]"); } out.newLine(); // flushes and closes the stream out.close(); } catch (IOException e) { System.out.println("There was a problem:" + e); } } </code></pre> <p>Can you tell me what should I modify to solve my problem?</p> <p>Thanks</p>
    singulars
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PTQuestion
    1. USDenis Tulskiy
    1. USuser1632278
    plurals
    1. This table or related slice is empty.
    1. PL
      singulars
      1. LTLinked
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POJava - Jena API - Output file
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. POJava - Jena API - Output file
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. POJava - Jena API - Output file
      1. This table or related slice is empty.
      1. VTUpMod
    1. COSince you still get no other answers, I'd suggest to carefully read mine. I think that the problem is with your input, in fact I suggested to modify the while loop in `while(i.hasNext) System.out.println(i.next())` to count the instances. Anyway you'll really have to study RDF at some point - that's why I think my answer can be a good starting point to find learning resources. Here on SO there are no wizards: we need error descriptions, stack traces, and self-contained test cases which can be run (and crashed) on our machines
      singulars
      1. POJava - Jena API - Output file
      1. USRaffaele
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload