querierWithSpatialRestGeometry.cpp

Shows how to use a querier from theme, using a spatial restriction defined by a geometry (polygons, lines, cells and points) from another theme

/************************************************************************************
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
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/* 
   This example shows how to use a querier from theme, using a spatial restriction 
           defined by a geometry (polygons, lines, cells and points) from another theme. 
           This spatial restriction is associated to querier. 
   
   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 = "DB320RC1";
     string user = "root";
     string pass = "";

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

           // Load the themes 
           TeTheme* ocorrencias = new TeTheme("Ocorrencias");
           if (!db_->loadTheme(ocorrencias))
    {
        cout << "Error: " << db_->errorMessage() << endl; 
                      db_->close(); 
        return 1;
    }

           TeTheme* bairros = new TeTheme("Tema_BairroBH");  
           if (!db_->loadTheme(bairros))
    {
        cout << "Error: " << db_->errorMessage() << endl; 
                      db_->close(); 
        return 1;
    }
                      
                      
           // ------------ querier to theme "bairros"
           bool loadGeometries = true;
           vector<string> attrs;
           attrs.push_back ("Bairrobh.nobai");

           TeQuerierParams querParamsBair(loadGeometries, attrs);
           querParamsBair.setParams(bairros);
           
           TeQuerier  querBairros(querParamsBair); 

           if(!querBairros.loadInstances())
           {
                      cout << " No data!!! " << endl; 
                      return 1;
           }

           //Load each element and pass to querier as spatial restriction
           TeSTInstance bairro;
           while(querBairros.fetchInstance (bairro))
           {
                      string name;
                      bairro.getPropertyValue(name, 0);

                      cout << " Bairro: " << name << endl;
                      
                      TePolygonSet setP;
                      
                      if(!bairro.getGeometry (setP))  //get the polygon set
                                 continue;

                      // ------------ querier to theme coletas
                      loadGeometries = false;
                      vector<string> attributes;
                      attributes.push_back ("ocorrenciasbh.Nrbo");

                      TeQuerierParams querParamsOcr(loadGeometries, attributes);
                      querParamsOcr.setParams(ocorrencias);
                      
                      //spatial restriction
                      querParamsOcr.setSpatialRest(&setP);

                      TeQuerier  querOcorrencias(querParamsOcr);
                      
                      if(!querOcorrencias.loadInstances())
                      {
                                 cout << " No data!!! " << endl; 
                                 continue;
                      }

                      TeSTInstance sto;
                      while(querOcorrencias.fetchInstance(sto)) 
                      {
                                 // Plot each attribute, its name and value
                                 TePropertyVector vec = sto.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;
                                 }

                                 //Plot the time
                                 cout << endl << " Data : " << sto.getInitialDateTime() << endl;
                      }
           }

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