feat: implement db provider

src/engine/core/engine.cpp

@@ -84,3 +84,13 @@ MscEngineModule &MscEngine::getModule(const std::string &name)
 
   throw std::runtime_error("Module not found: " + name);
 }
+
+std::unique_ptr<MscEngineDBProvider> MscEngine::createDBProvider()
+{
+  return std::make_unique<MscEngineDBProvider>();
+}
+
+std::unique_ptr<MscEngineDBProvider> MscEngine::createDBProvider(const std::string &filepath)
+{
+  return std::make_unique<MscEngineDBProvider>(filepath);
+}

src/engine/core/engine_db_provider.cpp

@@ -0,0 +1,45 @@
+#include <engine/core/engine_db_provider.hpp>
+#include <stdexcept>
+
+MscEngineDBProvider::MscEngineDBProvider() : MscEngineDBProvider(":memory:")
+{
+}
+
+MscEngineDBProvider::MscEngineDBProvider(const std::string &filepath)
+{
+    const int result = sqlite3_open(filepath.c_str(), &_db);
+    if (result != SQLITE_OK)
+    {
+        const std::string message = _db != nullptr
+                                        ? sqlite3_errmsg(_db)
+                                        : "unknown SQLite error";
+
+        if (_db != nullptr)
+        {
+            sqlite3_close(_db);
+            _db = nullptr;
+        }
+
+        throw std::runtime_error("Failed to open SQLite database: " + message);
+    }
+}
+
+MscEngineDBProvider::~MscEngineDBProvider()
+{
+    if (_db != nullptr)
+        sqlite3_close(_db);
+}
+
+void MscEngineDBProvider::execute(const std::string &sql)
+{
+    char *errorMessage = nullptr;
+    const int result = sqlite3_exec(_db, sql.c_str(), nullptr, nullptr, &errorMessage);
+
+    if (result == SQLITE_OK)
+        return;
+
+    std::string message(errorMessage);
+    sqlite3_free(errorMessage);
+
+    throw std::runtime_error("Failed to execute SQL: " + message);
+}