Implement our own database ORM, and update the whole code to use it

Entirely replace LiteSQL

fix #3271

src/database/row.hpp

@@ -0,0 +1,75 @@
+#pragma once
+
+#include <database/insert_query.hpp>
+#include <logger/logger.hpp>
+
+#include <type_traits>
+
+#include <sqlite3.h>
+
+template <typename ColumnType, typename... T>
+typename std::enable_if<!std::is_same<std::decay_t<ColumnType>, Id>::value, void>::type
+update_id(std::tuple<T...>&, sqlite3*)
+{}
+
+template <typename ColumnType, typename... T>
+typename std::enable_if<std::is_same<std::decay_t<ColumnType>, Id>::value, void>::type
+update_id(std::tuple<T...>& columns, sqlite3* db)
+{
+  auto&& column = std::get<ColumnType>(columns);
+  log_debug("Found an autoincrement col.");
+  auto res = sqlite3_last_insert_rowid(db);
+  log_debug("Value is now: ", res);
+  column.value = res;
+}
+
+template <std::size_t N, typename... T>
+typename std::enable_if<N < sizeof...(T), void>::type
+update_autoincrement_id(std::tuple<T...>& columns, sqlite3* db)
+{
+  using ColumnType = typename std::remove_reference<decltype(std::get<N>(columns))>::type;
+  update_id<ColumnType>(columns, db);
+  update_autoincrement_id<N+1>(columns, db);
+}
+
+template <std::size_t N, typename... T>
+typename std::enable_if<N == sizeof...(T), void>::type
+update_autoincrement_id(std::tuple<T...>&, sqlite3*)
+{}
+
+template <typename... T>
+struct Row
+{
+    Row(std::string name):
+    table_name(std::move(name))
+    {}
+
+    template <typename Type>
+    auto& col()
+    {
+      auto&& col = std::get<Type>(this->columns);
+      return col.value;
+    }
+
+    template <typename Type>
+    const auto& col() const
+    {
+      auto&& col = std::get<Type>(this->columns);
+      return col.value;
+    }
+
+    void save(sqlite3* db)
+    {
+      InsertQuery query(this->table_name);
+      query.insert_col_names(this->columns);
+      query.insert_values(this->columns);
+      log_debug(query.body);
+
+      query.execute(this->columns, db);
+
+      update_autoincrement_id<0>(this->columns, db);
+    }
+
+    std::tuple<T...> columns;
+    std::string table_name;
+};