SQLitePlatformDistribution.C File Reference

Detailed Description

This tutorial demonstrates how TSQLServer can be used to create a connection with a SQlite3 database.

It accesses the Sqlite data base. Download from https://root.cern/files/root_download_stats.sqlite In order to display the Platform Distribution of ROOT, we choose to create two TH1F histograms: one that includes all types of platforms, other filtering and classifying them. This procedure is taking as parameter the values stored in the "Platform" column from the database. At the end, the histograms are filled with their specific demand regarding the platform's type. This product includes GeoLite2 data created by MaxMind, available from http://www.maxmind.com.

 
#include <TSQLiteServer.h>
#include <TSQLiteResult.h>
#include <TSQLRow.h>
#include <TString.h>
 
void SQLitePlatformDistribution(){
 
   TSQLServer *db = TSQLServer::Connect("sqlite://root_download_stats.sqlite", "", "");
 
   const char *rootPlatform = "SELECT Platform FROM accesslog;";
 
   TSQLResult *rootPlatformRes = db->Query(rootPlatform);
 
   TH1F *hrootPlatform = new TH1F("hrootPlatform", "Platform Distribution", 7, 0, -1);
   TH1F *shorthrootPlatform = new TH1F("shorthrootPlatform", "Short Platform Distribution", 7, 0, -1);
 
   while (TSQLRow *row = rootPlatformRes->Next()) {
      TString rowPlatform(row->GetField(0));
      TString Platform(rowPlatform);
      TString Platform_0(rowPlatform(0,5));
      TString Platform_1(rowPlatform(0,6));
      TString Platform_2(rowPlatform(0,8));
      if ( rowPlatform.Contains("win32") ){
         shorthrootPlatform->Fill(Platform_0,1);
      } else if ( rowPlatform.Contains("Linux") ){
         shorthrootPlatform->Fill(Platform_0,1);
      } else if ( rowPlatform.Contains("source") ){
         shorthrootPlatform->Fill(Platform_1,1);
      } else if ( rowPlatform.Contains("macosx64") ){
         shorthrootPlatform->Fill(Platform_2,1);
      } else if ( rowPlatform.Contains("IRIX64") ){
         shorthrootPlatform->Fill(Platform_1,1);
      }
 
      hrootPlatform->Fill(Platform,1);
 
      delete row;
   }
 
   TCanvas *PlatformDistributionHistogram = new TCanvas();
 
   hrootPlatform->GetXaxis()->LabelsOption("a");
   hrootPlatform->LabelsDeflate("X");
   hrootPlatform->Draw();
 
   TCanvas *shortPlatformDistributionHistogram = new TCanvas();
 
   shorthrootPlatform->GetXaxis()->LabelsOption("a");
   shorthrootPlatform->LabelsDeflate("X");
   shorthrootPlatform->Draw();
}

Author

Alexandra-Maria Dobrescu 08/2018

Definition in file SQLitePlatformDistribution.C.