Backendless Android: comment récupérer des données utilisateur spécifiques à partir d'une table?

Question

Les données utilisateur de l'application Android ont été enregistrées dans une table Backendless. Je veux récupérer les données utilisateur de la table.

J'ai essayé de chercher avec 'where clause', mais je ne sais pas comment afficher les données trouvées. https://backendless.com/docs/android/doc.html#data_search_with_where_clause

Le code suivant avait une erreur de serveur Backendless 1023.

void onFindContact() { 

    IDataStore<Map> contactStorage = Backendless.Data.of("Contact"); 
    DataQueryBuilder queryBuilder = DataQueryBuilder.create(); 

    // set where clause 
    queryBuilder.setWhereClause("age is not null"); 

    // set related columns 
    queryBuilder.setRelated("address", "phoneNumber"); 

    // request sorting 
    //queryBuilder.setSortBy("name"); 

    //set offset and page size 
    //queryBuilder.setPageSize(20); 
    //queryBuilder.setOffset(40); 

    contactStorage.find(queryBuilder, new AsyncCallback<List<Map>>() { 
     @Override 
     public void handleResponse(List<Map> contactObjects) { 
      Log.i("MYAPP", "Retrieved " + contactObjects.size() + " objects"); 
      Toast.makeText(FindContactActivity.this, "Retrieved " + contactObjects.size() + " objects from Backendless table", Toast.LENGTH_LONG).show(); 

      BackendlessUser user = Backendless.UserService.CurrentUser(); 
      if (user != null) { 
       // get user's phone number (i.e. custom property) 
       String phoneNumber = (String) user.getProperty("phoneNumber"); 
       Toast.makeText(FindContactActivity.this, String.format("phone number: %s", phoneNumber), Toast.LENGTH_LONG).show(); 

       // get user's age (i.e. custom property) 
       String age = (String) user.getProperty("age"); 
       Toast.makeText(FindContactActivity.this, String.format("age: %s", age), Toast.LENGTH_LONG).show(); 

       // get user's address (i.e. custom property) 
       String adress = (String) user.getProperty("address"); 
       Toast.makeText(FindContactActivity.this, String.format("address: %s", adress), Toast.LENGTH_LONG).show(); 
      } 
     } 
     @Override 
     public void handleFault(BackendlessFault fault) 
     { 
      Log.e("MYAPP", "Server reported an error " + fault.getCode());//compile error at 'getMessage' 
      Toast.makeText(FindContactActivity.this,"Backendless Server reported an error "+ fault.getCode(), Toast.LENGTH_LONG).show(); 
     } 
    }); 
    //</Map> //compile error at '</map>' 

    /**** from https://backendless.com/docs/android/doc.html#data_search_with_where_clause 
    * Find all contacts where the value of the "age" property equals 47: 
    * 
    String whereClause = "age = 47"; 
    DataQueryBuilder queryBuilder = DataQueryBuilder.create(); 
    queryBuilder.setWhereClause(whereClause); 


    Backendless.Data.of("Contact").find(queryBuilder, new AsyncCallback<List<Map>>(){ 
       @Override 
       public void handleResponse(List<Map> foundContacts) 
       { 
        // every loaded object from the "Contact" table is now an individual java.util.Map 
       } 
       @Override 
       public void handleFault(BackendlessFault fault) 
       { 
        // an error has occurred, the error code can be retrieved with fault.getCode() 
       } 
    }); 
    */ 
} 

}

Answer 1

Un exemple de récupération de données est disponible dans la documentation Backendless: https://backendless.com/docs/android/doc.html#data_search_with_where_clause