TerraLib and TerraView Wiki Page

You are here: start » wiki » documentation » mini_curso » dataaccess

Differences

This shows you the differences between two versions of the page.

Link to this comparison view

Both sides previous revision Previous revision
Next revision 		Previous revision
wiki:documentation:mini_curso:dataaccess [2016/01/19 15:12]
gribeiro 		wiki:documentation:mini_curso:dataaccess [2016/01/20 15:56] (current)
gribeiro
Line 1: Line 1:
-====== Data Access ======+ ====== Data Access ======
  
-**1.** Script CMake:+**1.** [[:​wiki:​documentation:​devguide:​data_access_module|Link para documentação do módulo Data Access]]. 
 + 
 +**2.** Script CMake:
 <file cmake CMakeLists.txt>​ <file cmake CMakeLists.txt>​
 cmake_minimum_required(VERSION 2.8.12) cmake_minimum_required(VERSION 2.8.12)
Line 34: Line 36:
 </​file>​ </​file>​
  
-**2.** Código:+**3.** Código:
 <file cpp main.cpp>​ <file cpp main.cpp>​
 // TerraLib // TerraLib
 #include <​terralib/​common.h>​ #include <​terralib/​common.h>​
 +#include <​terralib/​dataaccess.h>​
 #include <​terralib/​plugin.h>​ #include <​terralib/​plugin.h>​
  
Line 67: Line 70:
 } }
  
 +void PrintDataSet(std::​string datasetName,​ te::​da::​DataSet* dataset)
 +{
 +  if(dataset == 0)
 +  {
 +    std::cout << "The informed dataset is NULL!" << std::endl;
 +    return;
 +  }
 +
 +// this will be used just to count the items in the dataset
 +  int item = 0;
 +
 +// traverse the dataset and print each dataset item
 +  std::cout << "​DATASET:​ " << datasetName;​
 +
 +  while(dataset->​moveNext())
 +  {
 +    std::cout << std::endl << "ITEM NUMBER: " << item++ << " ======================="​ << std::endl;
 +
 +    for(std::​size_t i = 0; i < dataset->​getNumProperties();​ ++i)
 +    {
 +      std::cout << dataset->​getPropertyName(i) << ": " ;
 +
 +      if(dataset->​isNull(i))
 +      {
 +        std::cout << ​ std::endl;
 +        continue;
 +      }
 +
 +      std::cout << dataset->​getAsString(i) << std::endl;
 +    }
 +  }
 +}
 +
 +void ReadShapefile()
 +{
 +  std::​unique_ptr<​te::​da::​DataSource>​ ds = te::​da::​DataSourceFactory::​make("​OGR"​);​
 +
 +  std::​map<​std::​string,​ std::​string>​ connInfo;
 +  connInfo["​URI"​] = "/​home/​terralib5/​curso/​data/​shp/​munic_2001.shp";​
 +
 +  ds->​setConnectionInfo(connInfo);​
 +
 +  ds->​open();​
 +
 +  std::cout << "​Datasource is opened? "
 +            << std::​boolalpha
 +            << ds->​isOpened() << std::endl;
 +
 +// check point: what can be done with this datasource
 +  //​PrintDataSourceCapabilities(ds.get());​
 +
 +// check point: retrieving data from the datasource
 +  std::cout << "​\nDatasource has "
 +            << ds->​getNumberOfDataSets()
 +            << " datasources"​ << std::endl;
 +
 +  std::​vector<​std::​string>​ dsets = ds->​getDataSetNames();​
 +
 +  for (size_t i=0; i<​ds->​getNumberOfDataSets();​ ++i)
 +    std::cout << '​['​ << (i + 1)
 +              << "]: "
 +              << dsets[i]
 +              << std::endl;
 +
 +// check point: retrieving the data from a dataset of the datasource
 +  if(ds->​getNumberOfDataSets() == 0)
 +    return;
 +
 +  std::​unique_ptr<​te::​da::​DataSet>​ dataset = ds->​getDataSet(dsets[0]);​
 +
 +  PrintDataSet(dsets[0],​ dataset.get());​
 +}
  
 int main(int argc, char* argv[]) int main(int argc, char* argv[])
Line 73: Line 148:
   ​   ​
   LoadModules();​   LoadModules();​
 +
 +  ReadShapefile();​
  
  
Line 83: Line 160:
 </​file>​ </​file>​
  
-**3.** Opções do CMake:+**4.** Opções do CMake:
 <code cmake> <code cmake>
 -DCMAKE_BUILD_TYPE:​STRING="​Debug"​ -DCMAKE_BUILD_TYPE:​STRING="​Debug"​
Line 90: Line 167:
 </​code>​ </​code>​
  
-**4.** Variável de ambiente para execução:+**5.** Variável de ambiente para execução:
 <code bash> <code bash>
-LD_LIBRARY_PATH=/​mylibs/​terralib5/​mylibs/​lib/:/​home/​terralib5/​mylibs/​gdal2/​lib:/​home/​terralib5/​mylibs/​pgsql/​lib:/​home/​terralib5/​mylibs/​terralib5/​lib+LD_LIBRARY_PATH=/​home/​terralib5/​mylibs/​lib/:/​home/​terralib5/​mylibs/​gdal2/​lib:/​home/​terralib5/​mylibs/​pgsql/​lib:/​home/​terralib5/​mylibs/​terralib5/​lib
 </​code>​ </​code>​

Trace: