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Reference Guide
SQLitePlatformDistribution.C File Reference

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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();
}
virtual void LabelsOption(Option_t *option="h")
Set option(s) to draw axis with labels option can be:
Definition: TAxis.cxx:641
The Canvas class.
Definition: TCanvas.h:23
1-D histogram with a float per channel (see TH1 documentation)}
Definition: TH1.h:574
TAxis * GetXaxis()
Definition: TH1.h:319
virtual Int_t Fill(Double_t x)
Increment bin with abscissa X by 1.
Definition: TH1.cxx:3338
void Draw(Option_t *option="") override
Draw this histogram with options.
Definition: TH1.cxx:3060
virtual void LabelsDeflate(Option_t *axis="X")
Reduce the number of bins for the axis passed in the option to the number of bins having a label.
Definition: TH1.cxx:5209
virtual TSQLRow * Next()=0
virtual TSQLResult * Query(const char *sql)=0
static TSQLServer * Connect(const char *db, const char *uid, const char *pw)
The db should be of the form: <dbms>://<host>[:<port>][/<database>], e.g.: mysql://pcroot....
Definition: TSQLServer.cxx:61
Basic string class.
Definition: TString.h:136
Author
Alexandra-Maria Dobrescu 08/2018

Definition in file SQLitePlatformDistribution.C.