Mockup for the core database classes.

core/database.cpp

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+#include "database.h"
+
+Database::Database() {
+}
+
+Database::~Database() {
+}

core/database.h

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+#ifndef DATABASE_H
+#define DATABASE_H
+
+#include <string>
+
+enum QueryErrorCode {
+	OK,
+	ERROR
+};
+
+class QueryResult {
+public:
+};
+
+class Database {
+public:
+	//probably needs refcount, depending on what db engines do, todo
+	virtual QueryResult *query(const std::string &sql);
+	virtual QueryResult *query_async(const std::string &sql);
+	//or
+	virtual QueryErrorCode query(QueryResult *result, const std::string &sql);
+	virtual QueryErrorCode query_async(QueryResult *result, const std::string &sql);
+
+	//also
+	//virtual QueryResult *query_prepared(const std::string &sql, param1, param2, ...);
+
+	Database();
+	~Database();
+};
+
+#endif

core/database_manager.cpp

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+#include "database_manager.h"
+
+void DatabaseManager::load() {
+    //go thourgh settings, and create all the defined db backends
+}
+
+DatabaseManager *DatabaseManager::get_singleton() {
+    return _instance;
+}
+
+DatabaseManager::DatabaseManager() {
+	_instance = this;
+}
+
+DatabaseManager::~DatabaseManager() {
+	_instance = nullptr;
+
+    for (uint32_t i = 0; i < databases.size(); ++i) {
+        delete databases[i];
+    }
+}
+
+DatabaseManager *DatabaseManager::_instance = nullptr;

core/database_manager.h

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+#ifndef DATABASE_MANAGER_H
+#define DATABASE_MANAGER_H
+
+#include <vector>
+
+#include "database.h"
+
+class DatabaseManager {
+public:
+    std::vector<Database *> databases;
+
+    void load();
+
+    DatabaseManager *get_singleton();
+
+    DatabaseManager();
+    ~DatabaseManager();
+
+private:
+    static DatabaseManager * _instance;
+};
+
+#endif