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createSTElementSetFromLayer.cpp

Shows how to create a new Spatial Temporal Element Set (STElementSet) from a layer

    /************************************************************************************
    TerraLib - a library for developing GIS applications.
    Copyright © 2001-2004 INPE and Tecgraf/PUC-Rio.

    This code is part of the TerraLib library.
    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) any later version.

    You should have received a copy of the GNU Lesser General Public
    License along with this library.

    The authors reassure the license terms regarding the warranties.
    They specifically disclaim any warranties, including, but not limited to,
    the implied warranties of merchantability and fitness for a particular purpose.
    The library provided hereunder is on an "as is" basis, and the authors have no
    obligation to provide maintenance, support, updates, enhancements, or modifications.
    In no event shall INPE and Tecgraf / PUC-Rio be held liable to any party for direct,
    indirect, special, incidental, or consequential damages arising out of the use
    of this library and its documentation.
    *************************************************************************************/

    /*
       This file illustrates an example of how to create a new Spatial Temporal Element
       Set (STElementSet) from a layer. A Spatial Temporal Element Set can be created
       from a layer or from a theme.
       In this example the STElementSet is created from a layer and is filled only
       with some attributes.

       Author: Karine Reis
    */

    #include "../../src/terralib/kernel/TeSTElementSet.h"
    #include "../../src/terralib/kernel/TeSTEFunctionsDB.h"
    #include "../../src/terralib/drivers/MySQL/TeMySQL.h"
    #include "../../src/terralib/drivers/shapelib/TeDriverSHPDBF.h"

    int main()
    {
               // Datatabase server parameters
               string host = "localhost";
               string dbname = "DB320RC1";
               string user = "root";
               string password = "vinhas";

               // Open a connection to the DB320RC1 MySQL database
               TeDatabase* db = new TeMySQL();
               if (!db->connect(host, user, password, dbname))
               {
                          cout << "Error: " << db->errorMessage() << endl;
                          cout << endl << "Press Enter\n";
                          getchar();
                          return 1;
               }
               cout << "Connection successful to the database \"" << dbname << "\" on MySQL server \"" << host << "\" !\n";;

               //Verify if there is the layer "EstadosBrasil"
               string layerName = "EstadosBrasil";
               if (!db->layerExist(layerName))
               {
                          // Create a new layer in the database
                          TeDatum sad69 = TeDatumFactory::make("SAD69");
                          TePolyconic* proj = new TePolyconic(sad69, -54);

                          TeLayer* layer = new TeLayer(layerName, db, proj);
                          string filename = "../data/EstadosBrasil.shp";         // Shapefile path
                          string tablename = "EstadosBrasil";         // Name of the attribute table

                          if (TeImportShape(layer, filename, tablename))
                                     cout << "The shapefile \"EstadosBrasil.shp\" was imported successfully into the TerraLib database!\n" << endl;
                          else
                                     cout << "Error: Fail to import the shapefile \"EstadosBrasil.shp\"!\n" << endl;

               }

               // Loads the layer
               TeLayer* estados = new TeLayer("EstadosBrasil");
               if (!db->loadLayer(estados))
               {
                   cout << "Fail to load the layer \"EstadosBrasil\": " << db->errorMessage() << endl;
                          db->close();
                          cout << endl << "Press Enter\n";
                          getchar();
            return 1;
               }

               // Creates a elementSet from the layer "estados"
               TeSTElementSet steSet (estados);

               // Defines what attributes will be kept in the elementSet.
               // The attribute name must be in the format "table_name.attribute_name"
               vector<string> attrs;
               attrs.push_back("EstadosBrasil.NOME_UF");
               attrs.push_back("EstadosBrasil.CAPITAL");

               // Fills the elementSet without geometries and with the
               // attributes NOME_UF and CAPITAL
               bool loadGeometries = false;
               bool loadAllAttributes = false;
               if(!TeSTOSetBuildDB(&steSet, loadGeometries, loadAllAttributes, attrs))
               {
                          cout << "Error! " << endl;
                          cout << endl << "Press Enter\n";
                          getchar();
                          return 1;
               }

               // Prints the number of elements of the elementSet
               cout << "Number of elements: " << steSet.numElements() << endl;

               //Traverse all instances of the set using iterator
               TeSTElementSet::iterator it = steSet.begin();
               while ( it != steSet.end())
               {
                          TeSTInstance st = (*it);

                          string desc;
                          // returns the attributes
                          TePropertyVector vectp = st.getPropertyVector();

                          cout << "Id: " << st.objectId() << " ---------------- " << endl;
                          for (unsigned int i=0; i<vectp.size(); i++)
                          {
                                     cout << vectp[i].attr_.rep_.name_ << "  =  ";
                                     cout << vectp[i].value_ << endl;
                          }
                          cout << endl;
                          ++it;
               }

               db->close();
               cout << endl << "Press Enter\n";
               getchar();
               return 0;
    }

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