Basic demonstrator

Works fine but can be slow, especially because of heavy IO.

create.cpp

@@ -0,0 +1,97 @@
+#include <cstdlib>
+#include <ctime>
+#include <iostream>
+#include <sqlite3.h>
+#include <string>
+#include <sstream>
+
+#include "db_info.h"
+#include "LicenceOperations.h"
+
+constexpr int totalLicences = 50'000'000;
+constexpr float offenceRate = 0.2;
+
+/// Generate a random string of numbers and letters
+/// ASCII letters are contiguous so juste add a random offset to 'a'.
+std::string createRandomID() {
+    char newID[IDLength];
+    for (char& idChar : newID) {
+        if (rand() % 2) {
+            idChar = 'a' + rand() % 26;
+        } else {
+            idChar = '0' + rand() % 10;
+        }
+    }
+    return newID;
+}
+
+int main()
+{
+    srand(time(nullptr));
+
+    sqlite3* db;
+    char* errorMessage = nullptr;
+    int errorCode;
+
+    errorCode = sqlite3_open(dbName.c_str(), &db);
+//    errorCode = sqlite3_open("TestDB.sqlite3", &db);
+    if (errorCode) {
+        std::cerr << "Error opening database" << std::endl << sqlite3_errmsg(db) << std::endl;
+        sqlite3_close(db);
+        return -1;
+    }
+
+    errorCode = sqlite3_exec(db, ("CREATE TABLE IF NOT EXISTS " + pointsTable + "("
+                                  + keyColumn +               " UNSIGNED BIG INT PRIMARY KEY NOT NULL,"
+                                  + idColumn +                " TEXT                         NOT NULL,"
+                                  + pointsColumn +            " INT                          NOT NULL,"
+                                  + countdownColumn +         " INT                          NOT NULL,"
+                                  + onePointCountdownColumn + " INT                          NOT NULL,"
+                                  + tenYearsCountdownColumn + " INT                          NOT NULL,"
+                                  + graveOffenceColumn +      " INT                          NOT NULL);").c_str(),
+                             nullptr, nullptr,  &errorMessage);
+
+    if (errorCode) {
+        dbError("Error creating table " + pointsTable, errorMessage);
+        sqlite3_close(db);
+        return -1;
+    }
+
+    // Batch all inits
+    errorCode = sqlite3_exec(db, "BEGIN TRANSACTION;", nullptr, nullptr, &errorMessage);
+    if (errorCode) {
+        dbError("Error while beginning transaction", errorMessage);
+        sqlite3_close(db);
+        return -1;
+    }
+
+    std::ios::sync_with_stdio(false);
+    std::time_t startTime = std::time(nullptr);
+    for (int i = 0; i < totalLicences; i++) {
+        const std::string& ID = createRandomID();
+        errorCode = addNewLicence(db, ID);
+        if (rand() < RAND_MAX * offenceRate) {
+            applyOffence(db, ID, rand() % 6 + 1, (offenceClass)(rand() % 5 + 1));
+        }
+
+        if (!(i % 10000)) {
+            std::cout << "Created " << i << " licences" << std::endl;
+        }
+
+        if (errorCode) {
+            break;
+        }
+    }
+
+    errorCode = sqlite3_exec(db, "END TRANSACTION;", nullptr, nullptr, &errorMessage);
+    if (errorCode) {
+        dbError("Error while closing transaction", errorMessage);
+        sqlite3_close(db);
+        return -1;
+    }
+
+    std::cout << "Db created successfully !" << std::endl;
+    std::cout << totalLicences << " licences created in " << std::time(nullptr) - startTime << std::endl;
+    sqlite3_close(db);
+    return 0;
+}