querierGroupChronon.cpp

Shows how to querier from theme, grouping spatiotemporal instances by a chronon

/************************************************************************************
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
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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
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In no event shall INPE and Tecgraf / PUC-Rio be held liable to any party for direct,
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of this library and its documentation.
*************************************************************************************/
/* 
   This example shows how to use a querier from theme, grouping  
   spatiotemporal instances by a chronon. 
             
   Author: Karine Reis 
*/

#include "../../src/terralib/drivers/MySQL/TeMySQL.h"
#include "../../src/terralib/kernel/TeQuerier.h"
#include "../../src/terralib/kernel/TeQuerierParams.h"

#include <time.h>
#include <iostream>

using std::cout;

int 
main()
{          
           
           // Datatabase server parameters
     string host = "localhost";
     string dbname = "saudavel";
     string user = "root";
     string pass = "karine";

            // Connects to database
     TeDatabase* db_ = new TeMySQL();
     if (!db_->connect(host,user,pass,dbname))
     {
         cout << "Error: " << db_->errorMessage() << endl;
         return 1;
     }

           // Load the layer 
           TeTheme* coletas = new TeTheme("Coletas");
           if (!db_->loadTheme(coletas))
    {
        cout << "Error: " << db_->errorMessage() << endl; 
                      db_->close(); 
        return 1;
    }
                      
           //Attributes to group 
           bool loadGeometries = false;
           TeGroupingAttr attributes;
           
           pair<TeAttributeRep, TeStatisticType> attr1(TeAttributeRep("Coletas.NRO_OVOS_PAL1"), TeSUM);
           attributes.push_back(attr1);

           pair<TeAttributeRep, TeStatisticType> attr2(TeAttributeRep("Coletas.NRO_OVOS_PAL2"), TeSUM);
           attributes.push_back(attr2);

           pair<TeAttributeRep, TeStatisticType> attr3(TeAttributeRep("Coletas.NRO_OVOS_PAL3"), TeSUM);
           attributes.push_back(attr3);

           pair<TeAttributeRep, TeStatisticType> attr4(TeAttributeRep("Coletas.NRO_OVOS"), TeSUM);
           attributes.push_back(attr4);

           // Set querier parameters - load only the grouped attributes 
           TeQuerierParams querierParams(loadGeometries, attributes);
           querierParams.setParams(coletas, TeMONTH);

           TeQuerier  querier(querierParams);

           // number of time frames generated by chronon TeMONTH
           int numTimeFrames = querier.getNumTimeFrames();
           
           // Load instances from theme for each time frame or month 
           for(int frame=0; frame < numTimeFrames; ++frame)
           {
                      TeTSEntry ts;
                      querier.getTSEntry(ts, frame);
                      
                      cout << " Time frame: " << Te2String(frame) << " --------------------------- " << endl << endl;

                      string initialDate = ts.time_.getInitialDateTime("DDsMMsYYYY"); 
                      string finalDate = ts.time_.getFinalDateTime("DDsMMsYYYY");
                      
                      cout << " Time Interval: " << initialDate << " to " << finalDate << endl << endl;

                      
                      if(!querier.loadInstances(frame))
                                 continue;

                      // Traverse all the elements 
                      TeSTInstance sti;
                      while(querier.fetchInstance(sti))
                      {
                                 cout << " Object: " << sti.objectId() << endl;
                                 
                                 // Plot each attribute, its name and value
                                 TePropertyVector vec = sti.getPropertyVector();
                                 for(unsigned int i=0; i<vec.size(); ++i)
                                 {
                                            string  attrName = vec[i].attr_.rep_.name_;
                                            string  attrValue = vec[i].value_;

                                            cout << attrName  << " : " << attrValue << endl;

                                 }
                      }

                      cout << endl << endl;
           }

           cout << " End " << endl;
           getchar(); 
           db_->close ();
           return 0;
}