Add postgresql support

src/database/sqlite3_engine.cpp

@@ -0,0 +1,93 @@
+#include <database/sqlite3_engine.hpp>
+
+#include <database/sqlite3_statement.hpp>
+
+#include <utils/tolower.hpp>
+#include <logger/logger.hpp>
+#include <vector>
+
+Sqlite3Engine::Sqlite3Engine(sqlite3* db):
+    db(db)
+{
+}
+
+Sqlite3Engine::~Sqlite3Engine()
+{
+  sqlite3_close(this->db);
+}
+
+std::set<std::string> Sqlite3Engine::get_all_columns_from_table(const std::string& table_name)
+{
+  std::set<std::string> result;
+  char* errmsg;
+  std::string query{"PRAGMA table_info(" + table_name + ")"};
+  int res = sqlite3_exec(this->db, query.data(), [](void* param, int columns_nb, char** columns, char**) -> int {
+    constexpr int name_column = 1;
+    std::set<std::string>* result = static_cast<std::set<std::string>*>(param);
+    if (name_column < columns_nb)
+      result->insert(utils::tolower(columns[name_column]));
+    return 0;
+  }, &result, &errmsg);
+
+  if (res != SQLITE_OK)
+    {
+      log_error("Error executing ", query, ": ", errmsg);
+      sqlite3_free(errmsg);
+    }
+
+  log_debug("List of columns in table ", table_name, ":");
+  for (const auto& c: result)
+    log_debug(c);
+  return result;
+}
+
+std::unique_ptr<DatabaseEngine> Sqlite3Engine::open(const std::string& filename)
+{
+  sqlite3* new_db;
+  auto res = sqlite3_open_v2(filename.data(), &new_db, SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE, nullptr);
+  if (res != SQLITE_OK)
+    {
+      log_error("Failed to open database file ", filename, ": ", sqlite3_errmsg(new_db));
+      sqlite3_close(new_db);
+      throw std::runtime_error("");
+    }
+  return std::make_unique<Sqlite3Engine>(new_db);
+}
+
+std::tuple<bool, std::string> Sqlite3Engine::raw_exec(const std::string& query)
+{
+  char* error;
+  const auto result = sqlite3_exec(db, query.data(), nullptr, nullptr, &error);
+  if (result != SQLITE_OK)
+    {
+      std::string err_msg(error);
+      sqlite3_free(error);
+      return std::make_tuple(false, err_msg);
+    }
+  return std::make_tuple(true, std::string{});
+}
+
+std::unique_ptr<Statement> Sqlite3Engine::prepare(const std::string& query)
+{
+  sqlite3_stmt* stmt;
+  log_debug("SQLITE3: ", query);
+  auto res = sqlite3_prepare(db, query.data(), static_cast<int>(query.size()) + 1,
+                             &stmt, nullptr);
+  if (res != SQLITE_OK)
+    {
+      log_error("Error preparing statement: ", sqlite3_errmsg(db));
+      return nullptr;
+    }
+  return std::make_unique<Sqlite3Statement>(stmt);
+}
+
+void Sqlite3Engine::extract_last_insert_rowid(Statement& statement)
+{
+  this->last_inserted_rowid = sqlite3_last_insert_rowid(this->db);
+  log_debug("extracted inserted ID: ", this->last_inserted_rowid);
+}
+
+std::string Sqlite3Engine::id_column_type()
+{
+  return "INTEGER PRIMARY KEY AUTOINCREMENT";
+}