diff --git a/packages/sqflite/sqflite_aurora/aurora/CMakeLists.txt b/packages/sqflite/sqflite_aurora/aurora/CMakeLists.txt
index a4cdaf0..ca1f6e2 100644
--- a/packages/sqflite/sqflite_aurora/aurora/CMakeLists.txt
+++ b/packages/sqflite/sqflite_aurora/aurora/CMakeLists.txt
@@ -19,10 +19,11 @@ pkg_check_modules(FlutterEmbedder REQUIRED IMPORTED_TARGET flutter-embedder)
 pkg_check_modules(SQLite REQUIRED IMPORTED_TARGET sqlite3)
 
 add_library(${PLUGIN_NAME} SHARED
-    lib/asynq.cpp
+    lib/async_queue.cpp
     lib/database.cpp
     lib/logger.cpp
-    lib/sqflite_aurora_plugin.cpp)
+    lib/sqflite_aurora_plugin.cpp
+    lib/utils.cpp)
 
 set_target_properties(${PLUGIN_NAME} PROPERTIES CXX_VISIBILITY_PRESET hidden)
 target_link_libraries(${PLUGIN_NAME} PRIVATE PkgConfig::FlutterEmbedder PkgConfig::SQLite)
diff --git a/packages/sqflite/sqflite_aurora/aurora/include/sqflite_aurora/asynq.h b/packages/sqflite/sqflite_aurora/aurora/include/sqflite_aurora/async_queue.h
similarity index 81%
rename from packages/sqflite/sqflite_aurora/aurora/include/sqflite_aurora/asynq.h
rename to packages/sqflite/sqflite_aurora/aurora/include/sqflite_aurora/async_queue.h
index 7c801d9..1b46375 100644
--- a/packages/sqflite/sqflite_aurora/aurora/include/sqflite_aurora/asynq.h
+++ b/packages/sqflite/sqflite_aurora/aurora/include/sqflite_aurora/async_queue.h
@@ -8,14 +8,10 @@
 #include <condition_variable>
 #include <functional>
 #include <mutex>
-#include <thread>
 #include <queue>
+#include <thread>
 
-#ifdef PLUGIN_IMPL
-#define PLUGIN_EXPORT __attribute__((visibility("default")))
-#else
-#define PLUGIN_EXPORT
-#endif
+#include <sqflite_aurora/globals.h>
 
 class PLUGIN_EXPORT AsyncQueue final
 {
@@ -26,7 +22,7 @@ public:
     AsyncQueue();
     ~AsyncQueue();
 
-    void Push(const Task &task);
+    void push(const Task &task);
 
 private:
     void run();
diff --git a/packages/sqflite/sqflite_aurora/aurora/include/sqflite_aurora/constants.h b/packages/sqflite/sqflite_aurora/aurora/include/sqflite_aurora/constants.h
index ba3f905..39c7a03 100644
--- a/packages/sqflite/sqflite_aurora/aurora/include/sqflite_aurora/constants.h
+++ b/packages/sqflite/sqflite_aurora/aurora/include/sqflite_aurora/constants.h
@@ -7,55 +7,55 @@
 
 #include <string>
 
-const std::string METHOD_GET_PLATFORM_VERSION = "getPlatformVersion";
-const std::string METHOD_GET_DATABASES_PATH = "getDatabasesPath";
-const std::string METHOD_DEBUG = "debug";
-const std::string METHOD_OPTIONS = "options";
-const std::string METHOD_OPEN_DATABASE = "openDatabase";
-const std::string METHOD_CLOSE_DATABASE = "closeDatabase";
-const std::string METHOD_INSERT = "insert";
-const std::string METHOD_EXECUTE = "execute";
-const std::string METHOD_QUERY = "query";
-const std::string METHOD_QUERY_CURSOR_NEXT = "queryCursorNext";
-const std::string METHOD_UPDATE = "update";
-const std::string METHOD_BATCH = "batch";
-const std::string METHOD_DELETE_DATABASE = "deleteDatabase";
-const std::string METHOD_DATABASE_EXISTS = "databaseExists";
+const inline std::string METHOD_GET_PLATFORM_VERSION = "getPlatformVersion";
+const inline std::string METHOD_GET_DATABASES_PATH = "getDatabasesPath";
+const inline std::string METHOD_DEBUG = "debug";
+const inline std::string METHOD_OPTIONS = "options";
+const inline std::string METHOD_OPEN_DATABASE = "openDatabase";
+const inline std::string METHOD_CLOSE_DATABASE = "closeDatabase";
+const inline std::string METHOD_INSERT = "insert";
+const inline std::string METHOD_EXECUTE = "execute";
+const inline std::string METHOD_QUERY = "query";
+const inline std::string METHOD_QUERY_CURSOR_NEXT = "queryCursorNext";
+const inline std::string METHOD_UPDATE = "update";
+const inline std::string METHOD_BATCH = "batch";
+const inline std::string METHOD_DELETE_DATABASE = "deleteDatabase";
+const inline std::string METHOD_DATABASE_EXISTS = "databaseExists";
 
-const std::string ARG_ID = "id";
-const std::string ARG_PATH = "path";
-const std::string ARG_READ_ONLY = "readOnly";
-const std::string ARG_SINGLE_INSTANCE = "singleInstance";
-const std::string ARG_LOG_LEVEL = "logLevel";
-const std::string ARG_TRANSACTION_ID = "transactionId";
-const std::string ARG_IN_TRANSACTION = "inTransaction";
-const std::string ARG_RECOVERED = "recovered";
-const std::string ARG_RECOVERED_IN_TRANSACTION = "recoveredInTransaction";
-const std::string ARG_SQL = "sql";
-const std::string ARG_SQL_ARGUMENTS = "arguments";
-const std::string ARG_NO_RESULT = "noResult";
-const std::string ARG_CONTINUE_ON_ERROR = "continueOnError";
-const std::string ARG_COLUMNS = "columns";
-const std::string ARG_ROWS = "rows";
-const std::string ARG_DATABASES = "databases";
-const std::string ARG_COMMAND = "cmd";
-const std::string ARG_OPERATIONS = "operations";
-const std::string ARG_METHOD = "method";
-const std::string ARG_RESULT = "result";
-const std::string ARG_ERROR = "error";
-const std::string ARG_ERROR_CODE = "code";
-const std::string ARG_ERROR_MESSAGE = "message";
-const std::string ARG_ERROR_DATA = "data";
-const std::string ARG_CURSOR_PAGE_SIZE = "cursorPageSize";
-const std::string ARG_CURSOR_ID = "cursorId";
-const std::string ARG_CANCEL = "cancel";
+const inline std::string ARG_ID = "id";
+const inline std::string ARG_PATH = "path";
+const inline std::string ARG_READ_ONLY = "readOnly";
+const inline std::string ARG_SINGLE_INSTANCE = "singleInstance";
+const inline std::string ARG_LOG_LEVEL = "logLevel";
+const inline std::string ARG_TRANSACTION_ID = "transactionId";
+const inline std::string ARG_IN_TRANSACTION = "inTransaction";
+const inline std::string ARG_RECOVERED = "recovered";
+const inline std::string ARG_RECOVERED_IN_TRANSACTION = "recoveredInTransaction";
+const inline std::string ARG_SQL = "sql";
+const inline std::string ARG_SQL_ARGUMENTS = "arguments";
+const inline std::string ARG_NO_RESULT = "noResult";
+const inline std::string ARG_CONTINUE_ON_ERROR = "continueOnError";
+const inline std::string ARG_COLUMNS = "columns";
+const inline std::string ARG_ROWS = "rows";
+const inline std::string ARG_DATABASES = "databases";
+const inline std::string ARG_COMMAND = "cmd";
+const inline std::string ARG_OPERATIONS = "operations";
+const inline std::string ARG_METHOD = "method";
+const inline std::string ARG_RESULT = "result";
+const inline std::string ARG_ERROR = "error";
+const inline std::string ARG_ERROR_CODE = "code";
+const inline std::string ARG_ERROR_MESSAGE = "message";
+const inline std::string ARG_ERROR_DATA = "data";
+const inline std::string ARG_CURSOR_PAGE_SIZE = "cursorPageSize";
+const inline std::string ARG_CURSOR_ID = "cursorId";
+const inline std::string ARG_CANCEL = "cancel";
 
-const std::string ERROR_SQFLITE = "sqlite_error";
-const std::string ERROR_OPEN = "open_failed";
-const std::string ERROR_CLOSE = "close_failed";
-const std::string ERROR_CLOSED = "database_closed";
-const std::string ERROR_BAD_PARAM = "bad_param";
-const std::string ERROR_BAD_ARGS = "bad_arguments";
-const std::string ERROR_INTERNAL = "internal";
+const inline std::string ERROR_SQFLITE = "sqlite_error";
+const inline std::string ERROR_OPEN = "open_failed";
+const inline std::string ERROR_CLOSE = "close_failed";
+const inline std::string ERROR_CLOSED = "database_closed";
+const inline std::string ERROR_BAD_PARAM = "bad_param";
+const inline std::string ERROR_BAD_ARGS = "bad_arguments";
+const inline std::string ERROR_INTERNAL = "internal";
 
 #endif /* FLUTTER_PLUGIN_SQFLITE_CONSTANTS_H */
diff --git a/packages/sqflite/sqflite_aurora/aurora/include/sqflite_aurora/database.h b/packages/sqflite/sqflite_aurora/aurora/include/sqflite_aurora/database.h
index a067a7a..76bd1ac 100644
--- a/packages/sqflite/sqflite_aurora/aurora/include/sqflite_aurora/database.h
+++ b/packages/sqflite/sqflite_aurora/aurora/include/sqflite_aurora/database.h
@@ -8,21 +8,16 @@
 #include <flutter/encodable.h>
 #include <flutter/method-call.h>
 
+#include <sqflite_aurora/globals.h>
 #include <sqflite_aurora/logger.h>
+#include <sqflite_aurora/utils.h>
 
 #include <functional>
-#include <optional>
 #include <sqlite3.h>
 #include <string>
 #include <unordered_map>
 #include <queue>
 
-#ifdef PLUGIN_IMPL
-#define PLUGIN_EXPORT __attribute__((visibility("default")))
-#else
-#define PLUGIN_EXPORT
-#endif
-
 class PLUGIN_EXPORT Database final
 {
 public:
@@ -46,70 +41,64 @@ public:
     };
 
 public:
-    Database(int id, const std::string &path, bool singleton, const Logger &logger);
+    Database(int id, const std::string &path, bool singleInstance, const Logger &logger);
     ~Database();
 
 public:
-    std::optional<std::string> Open();
-    std::optional<std::string> OpenReadOnly();
-    std::optional<std::string> Close();
-    std::optional<std::string> Execute(const std::string &sql, const Encodable::List &args);
-    std::optional<std::string> QueryCursorNext(int cursorID, bool cancel, Encodable::Map &result);
-    std::optional<std::string> Query(const std::string &sql,
-                                     const Encodable::List &args,
-                                     Encodable::Map &result);
-    std::optional<std::string> QueryWithPageSize(const std::string &sql,
-                                                 const Encodable::List &args,
-                                                 int64_t pageSize,
-                                                 Encodable::Map &result);
-    std::optional<std::string> Insert(const std::string &sql,
-                                      const Encodable::List &args,
-                                      int &insertID);
-    std::optional<std::string> Update(const std::string &sql,
-                                      const Encodable::List &args,
-                                      int &updated);
-    std::optional<std::string> Batch(const std::vector<Operation> &operations,
-                                     bool continueOnError,
-                                     Encodable::List &results);
-
-    void EnterInTransaction();
-    void LeaveTransaction();
-    int CurrentTransactionID();
+    utils::error open();
+    utils::error openReadOnly();
+    utils::error close();
+    utils::error execute(const std::string &sql, const Encodable::List &args);
+    utils::error queryCursorNext(int cursorID, bool cancel, Encodable::Map &result);
+    utils::error query(const std::string &sql, const Encodable::List &args, Encodable::Map &result);
+    utils::error queryWithPageSize(const std::string &sql,
+                                   const Encodable::List &args,
+                                   int64_t pageSize,
+                                   Encodable::Map &result);
+    utils::error insert(const std::string &sql, const Encodable::List &args, int &insertID);
+    utils::error update(const std::string &sql, const Encodable::List &args, int &updated);
+    utils::error batch(const std::vector<Operation> &operations,
+                       bool continueOnError,
+                       Encodable::List &results);
+
+    void enterInTransaction();
+    void leaveTransaction();
+    int currentTransactionID();
 
     typedef std::function<void()> SqlCommandCallback;
-    void ProcessSqlCommand(int transactionID, const SqlCommandCallback &callback);
+    void processSqlCommand(int transactionID, const SqlCommandCallback &callback);
 
 public:
-    bool IsOpen() const;
-    bool IsSingleInstance() const;
-    bool IsInTransaction() const;
-    bool IsInMemory() const;
-    bool IsReadOnly() const;
+    bool isOpen() const;
+    bool isSingleInstance() const;
+    bool isInTransaction() const;
+    bool isInMemory() const;
+    bool isReadOnly() const;
 
-    const std::string &Path() const;
-    int64_t ID() const;
-    Logger::Level LogLevel() const;
+    const std::string &path() const;
+    int64_t id() const;
+    Logger::Level logLevel() const;
 
 private:
     std::string currentErrorMessage();
-    std::optional<std::string> createParentDir();
-    std::optional<std::string> bindStmtArgs(sqlite3_stmt *stmt, const Encodable::List &args);
+    utils::error createParentDir();
+    utils::error bindStmtArgs(sqlite3_stmt *stmt, const Encodable::List &args);
 
     void closeCursor(const Cursor &cursor);
-    std::optional<std::string> resultFromCursor(const Cursor &cursor, Encodable::Map &result);
+    utils::error resultFromCursor(const Cursor &cursor, Encodable::Map &result);
 
 private:
-    int64_t id;
-    std::string path;
-    bool isSingleInstance;
-    bool isReadOnly;
-    Logger logger;
-    int transactionID;
-    int currentTransactionID;
-    std::queue<SqlCommandCallback> pendingSqlCallbacks;
-    int64_t cursorID;
-    std::unordered_map<int64_t, Cursor> cursors;
-    sqlite3 *db;
+    int64_t m_id;
+    std::string m_path;
+    bool m_isSingleInstance;
+    bool m_isReadOnly;
+    Logger m_logger;
+    int m_transactionID;
+    int m_currentTransactionID;
+    std::queue<SqlCommandCallback> m_pendingSqlCallbacks;
+    int64_t m_cursorID;
+    std::unordered_map<int64_t, Cursor> m_cursors;
+    sqlite3 *m_db;
 };
 
 #endif /* FLUTTER_PLUGIN_SQFLITE_DATABASE_H */
diff --git a/packages/sqflite/sqflite_aurora/aurora/include/sqflite_aurora/globals.h b/packages/sqflite/sqflite_aurora/aurora/include/sqflite_aurora/globals.h
new file mode 100644
index 0000000..45d7824
--- /dev/null
+++ b/packages/sqflite/sqflite_aurora/aurora/include/sqflite_aurora/globals.h
@@ -0,0 +1,10 @@
+#ifndef FLUTTER_PLUGIN_SQFLITE_GLOBALS_H
+#define FLUTTER_PLUGIN_SQFLITE_GLOBALS_H
+
+#ifdef PLUGIN_IMPL
+#define PLUGIN_EXPORT __attribute__((visibility("default")))
+#else
+#define PLUGIN_EXPORT
+#endif
+
+#endif /* FLUTTER_PLUGIN_SQFLITE_GLOBALS_H */
diff --git a/packages/sqflite/sqflite_aurora/aurora/include/sqflite_aurora/logger.h b/packages/sqflite/sqflite_aurora/aurora/include/sqflite_aurora/logger.h
index aefcd7a..3d16fc5 100644
--- a/packages/sqflite/sqflite_aurora/aurora/include/sqflite_aurora/logger.h
+++ b/packages/sqflite/sqflite_aurora/aurora/include/sqflite_aurora/logger.h
@@ -6,14 +6,9 @@
 #define FLUTTER_PLUGIN_SQFLITE_LOGGER_H
 
 #include <flutter/logger.h>
+#include <sqflite_aurora/globals.h>
 #include <string>
 
-#ifdef PLUGIN_IMPL
-#define PLUGIN_EXPORT __attribute__((visibility("default")))
-#else
-#define PLUGIN_EXPORT
-#endif
-
 class PLUGIN_EXPORT Logger final
 {
 public:
@@ -26,19 +21,19 @@ public:
 public:
     Logger(Level level, const std::string &tag);
 
-    Level LogLevel() const;
-    void SetLogLevel(Level level);
+    Level logLevel() const;
+    void setLogLevel(Level level);
 
-    std::string Tag() const;
-    void SetTag(const std::string &tag);
+    std::string tag() const;
+    void setTag(const std::string &tag);
 
     std::ostream &verb();
     std::ostream &sql();
 
 private:
-    Level level;
-    std::string tag;
-    std::ostream devnull;
+    Level m_level;
+    std::string m_tag;
+    std::ostream m_devnull;
 };
 
 #endif /* FLUTTER_PLUGIN_SQFLITE_LOGGER_H */
diff --git a/packages/sqflite/sqflite_aurora/aurora/include/sqflite_aurora/sqflite_aurora_plugin.h b/packages/sqflite/sqflite_aurora/aurora/include/sqflite_aurora/sqflite_aurora_plugin.h
index 2390334..7620948 100644
--- a/packages/sqflite/sqflite_aurora/aurora/include/sqflite_aurora/sqflite_aurora_plugin.h
+++ b/packages/sqflite/sqflite_aurora/aurora/include/sqflite_aurora/sqflite_aurora_plugin.h
@@ -7,19 +7,14 @@
 
 #include <flutter/plugin-interface.h>
 
-#include <sqflite_aurora/asynq.h>
+#include <sqflite_aurora/async_queue.h>
 #include <sqflite_aurora/database.h>
+#include <sqflite_aurora/globals.h>
 
 #include <memory>
 #include <mutex>
 #include <unordered_map>
 
-#ifdef PLUGIN_IMPL
-#define PLUGIN_EXPORT __attribute__((visibility("default")))
-#else
-#define PLUGIN_EXPORT
-#endif
-
 class PLUGIN_EXPORT SqfliteAuroraPlugin final : public PluginInterface
 {
 public:
@@ -49,23 +44,23 @@ private:
     void databaseRemove(std::shared_ptr<Database> db);
     void databaseAdd(std::shared_ptr<Database> db);
 
-    void success(const MethodCall &call, const Encodable &result = nullptr);
-    void error(const MethodCall &call,
-               const std::string &error,
-               const std::string &message,
-               const std::string &desc = "",
-               const Encodable &details = nullptr);
+    void sendSuccess(const MethodCall &call, const Encodable &result = nullptr);
+    void sendError(const MethodCall &call,
+                   const std::string &error,
+                   const std::string &message,
+                   const std::string &desc = "",
+                   const Encodable &details = nullptr);
 
     Encodable::Map makeOpenResult(int64_t dbID, bool recovered, bool recoveredInTransaction);
 
 private:
-    std::mutex mutex;
-    std::unordered_map<std::string, std::shared_ptr<Database>> singletonDatabases;
-    std::unordered_map<int64_t, std::shared_ptr<Database>> databases;
-    int64_t dbID = 0;
-    Logger logger;
-    bool queryAsMapList = false;
-    AsyncQueue asynq;
+    std::mutex m_mutex;
+    std::unordered_map<std::string, std::shared_ptr<Database>> m_singleInstanceDatabases;
+    std::unordered_map<int64_t, std::shared_ptr<Database>> m_databases;
+    int64_t m_dbID = 0;
+    Logger m_logger;
+    bool m_queryAsMapList = false;
+    AsyncQueue m_asyncQueue;
 };
 
 #endif /* FLUTTER_PLUGIN_SQFLITE_H */
diff --git a/packages/sqflite/sqflite_aurora/aurora/include/sqflite_aurora/utils.h b/packages/sqflite/sqflite_aurora/aurora/include/sqflite_aurora/utils.h
new file mode 100644
index 0000000..810de0e
--- /dev/null
+++ b/packages/sqflite/sqflite_aurora/aurora/include/sqflite_aurora/utils.h
@@ -0,0 +1,30 @@
+/*
+ * Copyright (c) 2023. Open Mobile Platform LLC.
+ * License: Proprietary.
+ */
+#ifndef FLUTTER_PLUGIN_SQFLITE_UTILS_H
+#define FLUTTER_PLUGIN_SQFLITE_UTILS_H
+
+#include <optional>
+#include <string>
+
+namespace utils {
+
+class error final
+{
+public:
+    explicit error(std::string message);
+    error() = default;
+
+    explicit operator bool() const;
+    const std::string &message() const;
+
+    static error none();
+
+private:
+    std::optional<std::string> m_message;
+};
+
+} /* namespace utils */
+
+#endif /* FLUTTER_PLUGIN_SQFLITE_UTILS_H */
diff --git a/packages/sqflite/sqflite_aurora/aurora/lib/asynq.cpp b/packages/sqflite/sqflite_aurora/aurora/lib/async_queue.cpp
similarity index 90%
rename from packages/sqflite/sqflite_aurora/aurora/lib/asynq.cpp
rename to packages/sqflite/sqflite_aurora/aurora/lib/async_queue.cpp
index 7731ce9..d9171c9 100644
--- a/packages/sqflite/sqflite_aurora/aurora/lib/asynq.cpp
+++ b/packages/sqflite/sqflite_aurora/aurora/lib/async_queue.cpp
@@ -2,7 +2,7 @@
  * Copyright (c) 2023. Open Mobile Platform LLC.
  * License: Proprietary.
  */
-#include <sqflite_aurora/asynq.h>
+#include <sqflite_aurora/async_queue.h>
 
 AsyncQueue::AsyncQueue()
     : m_running(false)
@@ -15,7 +15,7 @@ AsyncQueue::~AsyncQueue()
     m_thread.join();
 }
 
-void AsyncQueue::Push(const Task &task)
+void AsyncQueue::push(const Task &task)
 {
     if (!m_running) {
         m_running = true;
@@ -38,8 +38,8 @@ void AsyncQueue::run()
 
         const auto task = m_tasks.front();
         m_tasks.pop();
-        lock.unlock();
 
+        lock.unlock();
         task();
     }
 }
diff --git a/packages/sqflite/sqflite_aurora/aurora/lib/database.cpp b/packages/sqflite/sqflite_aurora/aurora/lib/database.cpp
index 8d95a65..15d6123 100644
--- a/packages/sqflite/sqflite_aurora/aurora/lib/database.cpp
+++ b/packages/sqflite/sqflite_aurora/aurora/lib/database.cpp
@@ -10,11 +10,13 @@
 
 namespace {
 
-void addError(Encodable::List &results, const std::string &error)
+void addError(Encodable::List &results, const utils::error &error)
 {
-    results.emplace_back(Encodable::Map{
-        {"error", Encodable::Map{{"message", error}}},
-    });
+    if (error) {
+        results.emplace_back(Encodable::Map{
+            {"error", Encodable::Map{{"message", error.message()}}},
+        });
+    }
 }
 
 template<typename T>
@@ -25,72 +27,72 @@ void addResult(Encodable::List &results, const T &result)
 
 } /* namespace */
 
-Database::Database(int id, const std::string &path, bool singleton, const Logger &logger)
-    : id(id)
-    , path(path)
-    , isSingleInstance(singleton)
-    , logger(logger.LogLevel(), logger.Tag() + "-db-" + std::to_string(id))
-    , transactionID(0)
-    , currentTransactionID(TransactionID::None)
-    , cursorID(0)
-    , db(nullptr)
+Database::Database(int id, const std::string &path, bool singleInstance, const Logger &logger)
+    : m_id(id)
+    , m_path(path)
+    , m_isSingleInstance(singleInstance)
+    , m_logger(logger.logLevel(), logger.tag() + "-db-" + std::to_string(id))
+    , m_transactionID(0)
+    , m_currentTransactionID(TransactionID::None)
+    , m_cursorID(0)
+    , m_db(nullptr)
 {}
 
 Database::~Database()
 {
-    Close();
+    close();
 }
 
-std::optional<std::string> Database::Open()
+utils::error Database::open()
 {
-    const auto error = this->createParentDir();
+    const auto error = createParentDir();
     if (error)
         return error;
 
-    int result_code = sqlite3_open_v2(this->path.c_str(),
-                                      &this->db,
+    int result_code = sqlite3_open_v2(m_path.c_str(),
+                                      &m_db,
                                       SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE,
                                       nullptr);
     if (result_code != SQLITE_OK)
-        return this->currentErrorMessage();
+        return utils::error(currentErrorMessage());
 
-    this->isReadOnly = false;
-    return std::nullopt;
+    m_isReadOnly = false;
+    return utils::error::none();
 }
 
-std::optional<std::string> Database::OpenReadOnly()
+utils::error Database::openReadOnly()
 {
-    const auto error = this->createParentDir();
+    const auto error = createParentDir();
     if (error)
         return error;
 
-    int result_code = sqlite3_open_v2(this->path.c_str(), &this->db, SQLITE_OPEN_READONLY, nullptr);
+    int result_code = sqlite3_open_v2(m_path.c_str(), &m_db, SQLITE_OPEN_READONLY, nullptr);
     if (result_code != SQLITE_OK)
-        return this->currentErrorMessage();
+        return utils::error(currentErrorMessage());
 
-    this->isReadOnly = true;
-    return std::nullopt;
+    m_isReadOnly = true;
+    return utils::error::none();
 }
 
-std::optional<std::string> Database::Close()
+utils::error Database::close()
 {
-    if (sqlite3_close_v2(this->db) != SQLITE_OK)
-        return this->currentErrorMessage();
+    if (sqlite3_close_v2(m_db) != SQLITE_OK)
+        return utils::error(currentErrorMessage());
 
-    this->db = nullptr;
-    this->pendingSqlCallbacks = {};
+    m_db = nullptr;
+    m_pendingSqlCallbacks = {};
 
-    return std::nullopt;
+    return utils::error::none();
 }
 
-std::optional<std::string> Database::Execute(const std::string &sql, const Encodable::List &args)
+utils::error Database::execute(const std::string &sql, const Encodable::List &args)
 {
     sqlite3_stmt *stmt = nullptr;
 
-    if (sqlite3_prepare_v2(this->db, sql.c_str(), -1, &stmt, nullptr) != SQLITE_OK)
-        return this->currentErrorMessage();
+    if (sqlite3_prepare_v2(m_db, sql.c_str(), -1, &stmt, nullptr) != SQLITE_OK)
+        return utils::error(currentErrorMessage());
 
-    const auto error = this->bindStmtArgs(stmt, args);
+    const auto error = bindStmtArgs(stmt, args);
 
     if (error) {
         sqlite3_finalize(stmt);
@@ -107,23 +109,23 @@ std::optional<std::string> Database::Execute(const std::string &sql, const Encod
             break;
 
         sqlite3_finalize(stmt);
-        return this->currentErrorMessage();
+        return utils::error(currentErrorMessage());
     }
 
     sqlite3_finalize(stmt);
-    return std::nullopt;
+    return utils::error::none();
 }
 
-std::optional<std::string> Database::Query(const std::string &sql,
+utils::error Database::query(const std::string &sql,
                                            const Encodable::List &args,
                                            Encodable::Map &result)
 {
     sqlite3_stmt *stmt = nullptr;
 
-    if (sqlite3_prepare_v2(this->db, sql.c_str(), -1, &stmt, nullptr) != SQLITE_OK)
-        return this->currentErrorMessage();
+    if (sqlite3_prepare_v2(m_db, sql.c_str(), -1, &stmt, nullptr) != SQLITE_OK)
+        return utils::error(currentErrorMessage());
 
-    const auto error = this->bindStmtArgs(stmt, args);
+    const auto error = bindStmtArgs(stmt, args);
 
     if (error) {
         sqlite3_finalize(stmt);
@@ -184,206 +186,206 @@ std::optional<std::string> Database::Query(const std::string &sql,
             break;
 
         sqlite3_finalize(stmt);
-        return this->currentErrorMessage();
+        return utils::error(currentErrorMessage());
     }
 
     result = Encodable::Map{{"columns", columns}, {"rows", rows}};
 
     sqlite3_finalize(stmt);
-    return std::nullopt;
+    return utils::error::none();
 }
 
-std::optional<std::string> Database::QueryWithPageSize(const std::string &sql,
+utils::error Database::queryWithPageSize(const std::string &sql,
                                                        const Encodable::List &args,
                                                        int64_t pageSize,
                                                        Encodable::Map &result)
 {
     sqlite3_stmt *stmt = nullptr;
 
-    if (sqlite3_prepare_v2(this->db, sql.c_str(), -1, &stmt, nullptr) != SQLITE_OK)
-        return this->currentErrorMessage();
+    if (sqlite3_prepare_v2(m_db, sql.c_str(), -1, &stmt, nullptr) != SQLITE_OK)
+        return utils::error(currentErrorMessage());
 
-    const auto error = this->bindStmtArgs(stmt, args);
+    const auto error = bindStmtArgs(stmt, args);
 
     if (error)
         return error;
 
-    this->cursorID += 1;
-    this->cursors[cursorID] = Cursor{this->cursorID, stmt, pageSize};
+    m_cursorID += 1;
+    m_cursors[m_cursorID] = Cursor{m_cursorID, stmt, pageSize};
 
-    return resultFromCursor(this->cursors[cursorID], result);
+    return resultFromCursor(m_cursors[m_cursorID], result);
 }
 
-std::optional<std::string> Database::QueryCursorNext(int cursorID,
+utils::error Database::queryCursorNext(int cursorID,
                                                      bool cancel,
                                                      Encodable::Map &result)
 {
-    this->logger.verb() << "querying cursor next (ID=" << cursorID << "; CANCEL=" << cancel << ")"
-                        << std::endl;
+    m_logger.verb() << "querying cursor next (ID=" << cursorID << "; CANCEL=" << cancel << ")"
+                    << std::endl;
 
-    if (!this->cursors.count(cursorID))
-        return "cursor not found";
+    if (!m_cursors.count(cursorID))
+        return utils::error("cursor not found");
 
-    const Cursor &cursor = this->cursors[cursorID];
+    const Cursor &cursor = m_cursors[cursorID];
 
     if (cancel) {
-        this->closeCursor(cursor);
-        return std::nullopt;
+        closeCursor(cursor);
+        return utils::error::none();
     }
 
-    return this->resultFromCursor(cursor, result);
+    return resultFromCursor(cursor, result);
 }
 
-std::optional<std::string> Database::Insert(const std::string &sql,
+utils::error Database::insert(const std::string &sql,
                                             const Encodable::List &args,
                                             int &insertID)
 {
-    if (this->isReadOnly)
-        return "database is readonly";
+    if (m_isReadOnly)
+        return utils::error("database is readonly");
 
-    const auto error = this->Execute(sql, args);
+    const auto error = execute(sql, args);
 
     if (error)
         return error;
 
-    const int updated = sqlite3_changes(this->db);
+    const int updated = sqlite3_changes(m_db);
 
-    this->logger.sql() << "rows updated: " << updated << std::endl;
+    m_logger.sql() << "rows updated: " << updated << std::endl;
 
     if (updated == 0) {
         insertID = 0;
-        return std::nullopt;
+        return utils::error::none();
     }
 
-    insertID = sqlite3_last_insert_rowid(this->db);
-    this->logger.sql() << "last inserted row id: " << insertID << std::endl;
+    insertID = sqlite3_last_insert_rowid(m_db);
+    m_logger.sql() << "last inserted row id: " << insertID << std::endl;
 
-    return std::nullopt;
+    return utils::error::none();
 }
 
-std::optional<std::string> Database::Update(const std::string &sql,
+utils::error Database::update(const std::string &sql,
                                             const Encodable::List &args,
                                             int &updated)
 {
-    if (this->isReadOnly)
-        return "database is readonly";
+    if (m_isReadOnly)
+        return utils::error("database is readonly");
 
-    const auto error = this->Execute(sql, args);
+    const auto error = execute(sql, args);
 
     if (error)
         return error;
 
-    updated = sqlite3_changes(this->db);
-    this->logger.sql() << "rows updated: " << updated << std::endl;
+    updated = sqlite3_changes(m_db);
+    m_logger.sql() << "rows updated: " << updated << std::endl;
 
-    return std::nullopt;
+    return utils::error::none();
 }
 
-void Database::ProcessSqlCommand(int transactionID, const SqlCommandCallback &callback)
+void Database::processSqlCommand(int transactionID, const SqlCommandCallback &callback)
 {
-    if (this->currentTransactionID == TransactionID::None) {
+    if (m_currentTransactionID == TransactionID::None) {
         callback();
         return;
     }
 
-    if (transactionID == this->currentTransactionID || transactionID == TransactionID::Force) {
+    if (transactionID == m_currentTransactionID || transactionID == TransactionID::Force) {
         callback();
 
-        if (this->currentTransactionID == TransactionID::None) {
-            while (!this->pendingSqlCallbacks.empty() && this->IsOpen()) {
-                const auto &pendingCallback = this->pendingSqlCallbacks.front();
+        if (m_currentTransactionID == TransactionID::None) {
+            while (!m_pendingSqlCallbacks.empty() && isOpen()) {
+                const auto &pendingCallback = m_pendingSqlCallbacks.front();
                 pendingCallback();
-                this->pendingSqlCallbacks.pop();
+                m_pendingSqlCallbacks.pop();
             }
         }
 
         return;
     }
 
-    this->pendingSqlCallbacks.push(callback);
+    m_pendingSqlCallbacks.push(callback);
 }
 
-void Database::EnterInTransaction()
+void Database::enterInTransaction()
 {
-    this->transactionID += 1;
-    this->currentTransactionID = this->transactionID;
+    m_transactionID += 1;
+    m_currentTransactionID = m_transactionID;
 }
 
-void Database::LeaveTransaction()
+void Database::leaveTransaction()
 {
-    this->currentTransactionID = TransactionID::None;
+    m_currentTransactionID = TransactionID::None;
 }
 
-int Database::CurrentTransactionID()
+int Database::currentTransactionID()
 {
-    return this->currentTransactionID;
+    return m_currentTransactionID;
 }
 
-bool Database::IsOpen() const
+bool Database::isOpen() const
 {
-    return this->db != nullptr;
+    return m_db != nullptr;
 }
 
-const std::string &Database::Path() const
+const std::string &Database::path() const
 {
-    return this->path;
+    return m_path;
 }
 
-bool Database::IsSingleInstance() const
+bool Database::isSingleInstance() const
 {
-    return this->isSingleInstance;
+    return m_isSingleInstance;
 }
 
-bool Database::IsReadOnly() const
+bool Database::isReadOnly() const
 {
-    return this->isReadOnly;
+    return m_isReadOnly;
 }
 
-bool Database::IsInTransaction() const
+bool Database::isInTransaction() const
 {
-    return this->currentTransactionID != TransactionID::None;
+    return m_currentTransactionID != TransactionID::None;
 }
 
-int64_t Database::ID() const
+int64_t Database::id() const
 {
-    return this->id;
+    return m_id;
 }
 
-Logger::Level Database::LogLevel() const
+Logger::Level Database::logLevel() const
 {
-    return this->logger.LogLevel();
+    return m_logger.logLevel();
 }
 
-bool Database::IsInMemory() const
+bool Database::isInMemory() const
 {
-    return this->path.empty() || this->path == ":memory:";
+    return m_path.empty() || m_path == ":memory:";
 }
 
 std::string Database::currentErrorMessage()
 {
-    const auto message = sqlite3_errmsg(this->db);
-    const auto code = sqlite3_extended_errcode(this->db);
+    const auto message = sqlite3_errmsg(m_db);
+    const auto code = sqlite3_extended_errcode(m_db);
 
     return std::string(message) + " (" + std::to_string(code) + ")";
 }
 
-std::optional<std::string> Database::createParentDir()
+utils::error Database::createParentDir()
 {
-    if (this->IsInMemory())
-        return std::nullopt;
+    if (isInMemory())
+        return utils::error::none();
 
-    const auto parentDir = std::filesystem::path(this->path).parent_path();
+    const auto parentDir = std::filesystem::path(m_path).parent_path();
 
     if (std::filesystem::exists(parentDir))
-        return std::nullopt;
+        return utils::error::none();
 
     if (std::filesystem::create_directories(parentDir))
-        return std::nullopt;
+        return utils::error::none();
 
-    return "couldn't create parent directory";
+    return utils::error("couldn't create parent directory");
 }
 
-std::optional<std::string> Database::bindStmtArgs(sqlite3_stmt *stmt, const Encodable::List &args)
+utils::error Database::bindStmtArgs(sqlite3_stmt *stmt, const Encodable::List &args)
 {
     int result = SQLITE_OK;
 
@@ -451,12 +453,12 @@ std::optional<std::string> Database::bindStmtArgs(sqlite3_stmt *stmt, const Enco
 
             for (const auto &entry : arg.GetList()) {
                 if (!entry.IsInt())
-                    return "only list of bytes is supported for statement parameter";
+                    return utils::error("only list of bytes is supported for statement parameter");
 
                 const auto value = entry.GetInt();
 
                 if (value < 0 || value > 255)
-                    return "only list of bytes is supported for statement parameter";
+                    return utils::error("only list of bytes is supported for statement parameter");
 
                 container.push_back(static_cast<uint8_t>(value));
             }
@@ -467,25 +469,25 @@ std::optional<std::string> Database::bindStmtArgs(sqlite3_stmt *stmt, const Enco
                                        container.size(),
                                        SQLITE_TRANSIENT);
         } else {
-            return "statement parameter has invalid type";
+            return utils::error("statement parameter has invalid type");
         }
 
         if (result != SQLITE_OK)
-            return this->currentErrorMessage();
+            return utils::error(currentErrorMessage());
     }
 
-    this->logger.sql() << sqlite3_expanded_sql(stmt) << std::endl;
-    return std::nullopt;
+    m_logger.sql() << sqlite3_expanded_sql(stmt) << std::endl;
+    return utils::error::none();
 }
 
 void Database::closeCursor(const Cursor &cursor)
 {
-    logger.verb() << "closing cursor (ID=" << cursor.id << ")" << std::endl;
+    m_logger.verb() << "closing cursor (ID=" << cursor.id << ")" << std::endl;
     sqlite3_finalize(cursor.stmt);
-    this->cursors.erase(cursor.id);
+    m_cursors.erase(cursor.id);
 }
 
-std::optional<std::string> Database::resultFromCursor(const Cursor &cursor, Encodable::Map &result)
+utils::error Database::resultFromCursor(const Cursor &cursor, Encodable::Map &result)
 {
     Encodable::List columns;
 
@@ -540,12 +542,12 @@ std::optional<std::string> Database::resultFromCursor(const Cursor &cursor, Enco
         }
 
         if (status == SQLITE_DONE) {
-            this->closeCursor(cursor);
+            closeCursor(cursor);
             break;
         }
 
-        this->closeCursor(cursor);
-        return this->currentErrorMessage();
+        closeCursor(cursor);
+        return utils::error(currentErrorMessage());
     }
 
     result = Encodable::Map{{"columns", columns}, {"rows", rows}};
@@ -553,10 +555,10 @@ std::optional<std::string> Database::resultFromCursor(const Cursor &cursor, Enco
     if (status != SQLITE_DONE)
         result.insert({ARG_CURSOR_ID, cursor.id});
 
-    return std::nullopt;
+    return utils::error::none();
 }
 
-std::optional<std::string> Database::Batch(const std::vector<Operation> &operations,
+utils::error Database::batch(const std::vector<Operation> &operations,
                                            bool continueOnError,
                                            Encodable::List &results)
 {
@@ -565,13 +567,13 @@ std::optional<std::string> Database::Batch(const std::vector<Operation> &operati
 
         if (method == METHOD_INSERT) {
             int insertID = 0;
-            const auto error = this->Insert(operation.sql, operation.arguments, insertID);
+            const auto error = insert(operation.sql, operation.arguments, insertID);
 
             if (error) {
                 if (!continueOnError)
                     return error;
 
-                addError(results, *error);
+                addError(results, error);
                 continue;
             }
 
@@ -584,13 +586,13 @@ std::optional<std::string> Database::Batch(const std::vector<Operation> &operati
         }
 
         if (method == METHOD_EXECUTE) {
-            const auto error = this->Execute(operation.sql, operation.arguments);
+            const auto error = execute(operation.sql, operation.arguments);
 
             if (error) {
                 if (!continueOnError)
                     return error;
 
-                addError(results, *error);
+                addError(results, error);
                 continue;
             }
 
@@ -600,13 +602,13 @@ std::optional<std::string> Database::Batch(const std::vector<Operation> &operati
 
         if (method == METHOD_QUERY) {
             Encodable::Map result;
-            const auto error = this->Query(operation.sql, operation.arguments, result);
+            const auto error = query(operation.sql, operation.arguments, result);
 
             if (error) {
                 if (!continueOnError)
                     return error;
 
-                addError(results, *error);
+                addError(results, error);
                 continue;
             }
 
@@ -616,13 +618,13 @@ std::optional<std::string> Database::Batch(const std::vector<Operation> &operati
 
         if (method == METHOD_UPDATE) {
             int updated = 0;
-            const auto error = this->Update(operation.sql, operation.arguments, updated);
+            const auto error = update(operation.sql, operation.arguments, updated);
 
             if (error) {
                 if (!continueOnError)
                     return error;
 
-                addError(results, *error);
+                addError(results, error);
                 continue;
             }
 
@@ -631,5 +633,5 @@ std::optional<std::string> Database::Batch(const std::vector<Operation> &operati
         }
     }
 
-    return std::nullopt;
+    return utils::error::none();
 }
diff --git a/packages/sqflite/sqflite_aurora/aurora/lib/logger.cpp b/packages/sqflite/sqflite_aurora/aurora/lib/logger.cpp
index ef13340..7355880 100644
--- a/packages/sqflite/sqflite_aurora/aurora/lib/logger.cpp
+++ b/packages/sqflite/sqflite_aurora/aurora/lib/logger.cpp
@@ -6,43 +6,43 @@
 #include <sqflite_aurora/logger.h>
 
 Logger::Logger(Level level, const std::string &tag)
-    : level(level)
-    , tag(tag)
-    , devnull(0)
+    : m_level(level)
+    , m_tag(tag)
+    , m_devnull(0)
 {}
 
-Logger::Level Logger::LogLevel() const
+Logger::Level Logger::logLevel() const
 {
-    return this->level;
+    return m_level;
 }
 
-void Logger::SetLogLevel(Level level)
+void Logger::setLogLevel(Level level)
 {
-    this->level = level;
+    m_level = level;
 }
 
-std::string Logger::Tag() const
+std::string Logger::tag() const
 {
-    return this->tag;
+    return m_tag;
 }
 
-void Logger::SetTag(const std::string &tag)
+void Logger::setTag(const std::string &tag)
 {
-    this->tag = tag;
+    m_tag = tag;
 }
 
 std::ostream &Logger::verb()
 {
-    if (this->level >= Level::Verbose)
-        return loginfo << (this->tag.empty() ? "" : "[" + this->tag + "] ");
+    if (m_level >= Level::Verbose)
+        return loginfo << (m_tag.empty() ? "" : "[" + m_tag + "] ");
 
-    return this->devnull;
+    return m_devnull;
 }
 
 std::ostream &Logger::sql()
 {
-    if (this->level >= Level::Sql)
-        return loginfo << (this->tag.empty() ? "" : "[" + this->tag + "] ");
+    if (m_level >= Level::Sql)
+        return loginfo << (m_tag.empty() ? "" : "[" + m_tag + "] ");
 
-    return this->devnull;
+    return m_devnull;
 }
diff --git a/packages/sqflite/sqflite_aurora/aurora/lib/sqflite_aurora_plugin.cpp b/packages/sqflite/sqflite_aurora/aurora/lib/sqflite_aurora_plugin.cpp
index ed6a83b..c60d17c 100644
--- a/packages/sqflite/sqflite_aurora/aurora/lib/sqflite_aurora_plugin.cpp
+++ b/packages/sqflite/sqflite_aurora/aurora/lib/sqflite_aurora_plugin.cpp
@@ -13,7 +13,7 @@
 
 namespace {
 
-int64_t GetTransactionID(const Encodable &args)
+int64_t getTransactionID(const Encodable &args)
 {
     if (!args.HasKey(ARG_TRANSACTION_ID))
         return static_cast<int64_t>(Database::TransactionID::None);
@@ -27,7 +27,7 @@ int64_t GetTransactionID(const Encodable &args)
     return args[ARG_TRANSACTION_ID].GetInt();
 }
 
-Encodable::List GetSqlArguments(const Encodable &args)
+Encodable::List getSqlArguments(const Encodable &args)
 {
     if (!args.HasKey(ARG_SQL_ARGUMENTS))
         return Encodable::List{};
@@ -44,15 +44,15 @@ Encodable::List GetSqlArguments(const Encodable &args)
 } /* namespace */
 
 SqfliteAuroraPlugin::SqfliteAuroraPlugin()
-    : dbID(0)
-    , logger(Logger::Level::None, "sqflite")
+    : m_dbID(0)
+    , m_logger(Logger::Level::None, "sqflite")
 {}
 
 void SqfliteAuroraPlugin::RegisterWithRegistrar(PluginRegistrar &registrar)
 {
     registrar.RegisterMethodChannel("com.tekartik.sqflite",
                                     MethodCodecType::Standard,
-                                    [this](const MethodCall &call) { this->onMethodCall(call); });
+                                    [this](const MethodCall &call) { onMethodCall(call); });
 }
 
 void SqfliteAuroraPlugin::onMethodCall(const MethodCall &call)
@@ -60,76 +60,76 @@ void SqfliteAuroraPlugin::onMethodCall(const MethodCall &call)
     const auto &method = call.GetMethod();
 
     if (method == METHOD_GET_PLATFORM_VERSION) {
-        this->onPlatformVersionCall(call);
+        onPlatformVersionCall(call);
         return;
     }
 
     if (method == METHOD_OPEN_DATABASE) {
-        this->onOpenDatabaseCall(call);
+        onOpenDatabaseCall(call);
         return;
     }
 
     if (method == METHOD_CLOSE_DATABASE) {
-        this->onCloseDatabaseCall(call);
+        onCloseDatabaseCall(call);
         return;
     }
 
     if (method == METHOD_DELETE_DATABASE) {
-        this->onDeleteDatabaseCall(call);
+        onDeleteDatabaseCall(call);
         return;
     }
 
     if (method == METHOD_DATABASE_EXISTS) {
-        this->onDatabaseExistsCall(call);
+        onDatabaseExistsCall(call);
         return;
     }
 
     if (method == METHOD_GET_DATABASES_PATH) {
-        this->onGetDatabasesPathCall(call);
+        onGetDatabasesPathCall(call);
         return;
     }
 
     if (method == METHOD_OPTIONS) {
-        this->onOptionsCall(call);
+        onOptionsCall(call);
         return;
     }
 
     if (method == METHOD_DEBUG) {
-        this->onDebugCall(call);
+        onDebugCall(call);
         return;
     }
 
     if (method == METHOD_EXECUTE) {
-        this->onExecuteCall(call);
+        onExecuteCall(call);
         return;
     }
 
     if (method == METHOD_QUERY) {
-        this->onQueryCall(call);
+        onQueryCall(call);
         return;
     }
 
     if (method == METHOD_QUERY_CURSOR_NEXT) {
-        this->onQueryCursorNextCall(call);
+        onQueryCursorNextCall(call);
         return;
     }
 
     if (method == METHOD_UPDATE) {
-        this->onUpdateCall(call);
+        onUpdateCall(call);
         return;
     }
 
     if (method == METHOD_INSERT) {
-        this->onInsertCall(call);
+        onInsertCall(call);
         return;
     }
 
     if (method == METHOD_BATCH) {
-        this->onBatchCall(call);
+        onBatchCall(call);
         return;
     }
 
-    this->success(call);
+    sendSuccess(call);
 }
 
 void SqfliteAuroraPlugin::onPlatformVersionCall(const MethodCall &call)
@@ -141,122 +141,114 @@ void SqfliteAuroraPlugin::onPlatformVersionCall(const MethodCall &call)
         if (line.rfind("VERSION_ID=") != 0)
             continue;
 
-        this->success(call, "Aurora " + line.substr(11));
+        sendSuccess(call, "Aurora " + line.substr(11));
         return;
     }
 
-    this->success(call, "Aurora");
+    sendSuccess(call, "Aurora");
 }
 
 void SqfliteAuroraPlugin::onOpenDatabaseCall(const MethodCall &call)
 {
-    const auto &args = call.GetArguments();
-
-    const auto dbPath = args[ARG_PATH].GetString();
-    const auto readOnly = args.HasKey(ARG_READ_ONLY) ? args[ARG_READ_ONLY].GetBoolean() : false;
+    const auto dbPath = call.GetArgument<Encodable::String>(ARG_PATH);
+    const auto readOnly = call.GetArgument<Encodable::Boolean>(ARG_READ_ONLY, false);
 
     const auto inMemory = dbPath.empty() || dbPath == ":memory:";
-    const auto singleton = args[ARG_SINGLE_INSTANCE].GetBoolean() && !inMemory;
+    const auto isSingleInstance = call.GetArgument<Encodable::Boolean>(ARG_SINGLE_INSTANCE)
+                                  && !inMemory;
 
-    if (singleton) {
-        const auto db = this->databaseByPath(dbPath);
+    if (isSingleInstance) {
+        const auto db = databaseByPath(dbPath);
 
         if (db) {
-            if (db->IsOpen()) {
-                this->logger.verb() << "re-opened single instance database"
-                                    << (db->IsInTransaction() ? "(in transaction) " : "")
-                                    << db->ID() << " " << db->Path() << std::endl;
+            if (db->isOpen()) {
+                m_logger.verb() << "re-opened single instance database"
+                                << (db->isInTransaction() ? "(in transaction) " : "") << db->id()
+                                << " " << db->path() << std::endl;
 
-                this->success(call, makeOpenResult(db->ID(), true, db->IsInTransaction()));
+                sendSuccess(call, makeOpenResult(db->id(), true, db->isInTransaction()));
                 return;
             }
 
-            this->logger.verb() << "single instance database " << db->Path() << " not opened"
-                                << std::endl;
+            m_logger.verb() << "single instance database " << db->path() << " not opened"
+                            << std::endl;
         }
     }
 
-    const auto db = std::make_shared<Database>(++dbID, dbPath, singleton, logger);
+    const auto db = std::make_shared<Database>(++m_dbID, dbPath, isSingleInstance, m_logger);
 
-    this->asynq.Push([this, db, readOnly, call] {
-        this->logger.sql() << "open database " + db->Path() + " (ID=" << db->ID() << ")"
-                           << std::endl;
+    m_asyncQueue.push([this, db, readOnly, call] {
+        m_logger.sql() << "open database " + db->path() + " (ID=" << db->id() << ")" << std::endl;
 
-        const auto error = readOnly ? db->OpenReadOnly() : db->Open();
+        const auto error = readOnly ? db->openReadOnly() : db->open();
         if (error) {
-            this->error(call, ERROR_OPEN, db->Path(), *error);
+            sendError(call, ERROR_OPEN, db->path(), error.message());
             return;
         }
 
-        this->databaseAdd(db);
-        this->success(call, makeOpenResult(db->ID(), false, false));
+        databaseAdd(db);
+        sendSuccess(call, makeOpenResult(db->id(), false, false));
     });
 }
 
 void SqfliteAuroraPlugin::onCloseDatabaseCall(const MethodCall &call)
 {
-    const auto &args = call.GetArguments();
-    const auto dbID = args[ARG_ID].GetInt();
-
+    const auto dbID = call.GetArgument<Encodable::Int>(ARG_ID);
     const auto db = databaseByID(dbID);
 
-    this->asynq.Push([this, db, dbID, call] {
+    m_asyncQueue.push([this, db, dbID, call] {
         if (!db) {
-            this->error(call, ERROR_CLOSED, "database closed", "ID=" + std::to_string(dbID) + ")");
+            sendError(call, ERROR_CLOSED, "database closed", "ID=" + std::to_string(dbID) + ")");
             return;
         }
 
-        this->logger.sql() << "closing database with ID=" << db->ID() << std::endl;
+        m_logger.sql() << "closing database with ID=" << db->id() << std::endl;
 
-        const auto error = db->Close();
+        const auto error = db->close();
         if (error) {
-            this->error(call, ERROR_CLOSE, db->Path(), *error);
+            sendError(call, ERROR_CLOSE, db->path(), error.message());
             return;
         }
 
-        this->databaseRemove(db);
-        this->success(call);
+        databaseRemove(db);
+        sendSuccess(call);
     });
 }
 
 void SqfliteAuroraPlugin::onDeleteDatabaseCall(const MethodCall &call)
 {
-    const auto &args = call.GetArguments();
-    const auto dbPath = args[ARG_PATH].GetString();
-
+    const auto dbPath = call.GetArgument<Encodable::String>(ARG_PATH);
     const auto db = databaseByPath(dbPath);
 
-    this->asynq.Push([this, db, dbPath, call] {
+    m_asyncQueue.push([this, db, dbPath, call] {
         if (db) {
-            if (db->IsOpen()) {
-                this->logger.verb()
-                    << "close database " << db->Path() << " (ID=" << db->ID() << ")" << std::endl;
+            if (db->isOpen()) {
+                m_logger.verb() << "close database " << db->path() << " (ID=" << db->id() << ")"
+                                << std::endl;
 
-                const auto error = db->Close();
+                const auto error = db->close();
                 if (error) {
-                    this->error(call, ERROR_CLOSE, db->Path(), *error);
+                    sendError(call, ERROR_CLOSE, db->path(), error.message());
                     return;
                 }
             }
 
-            this->databaseRemove(db);
+            databaseRemove(db);
         }
 
         if (std::filesystem::exists(dbPath)) {
-            this->logger.verb() << "delete not opened database " << dbPath << std::endl;
+            m_logger.verb() << "delete not opened database " << dbPath << std::endl;
             std::filesystem::remove(dbPath);
         }
 
-        this->success(call);
+        sendSuccess(call);
     });
 }
 
 void SqfliteAuroraPlugin::onDatabaseExistsCall(const MethodCall &call)
 {
-    const auto &args = call.GetArguments();
-    const auto dbPath = args[ARG_PATH].GetString();
-
-    this->success(call, std::filesystem::exists(dbPath));
+    const auto dbPath = call.GetArgument<Encodable::String>(ARG_PATH);
+    sendSuccess(call, std::filesystem::exists(dbPath));
 }
 
 void SqfliteAuroraPlugin::onGetDatabasesPathCall(const MethodCall &call)
@@ -264,48 +256,46 @@ void SqfliteAuroraPlugin::onGetDatabasesPathCall(const MethodCall &call)
     const auto home = std::getenv("HOME");
 
     if (home == nullptr) {
-        this->error(call, ERROR_INTERNAL, "environment variable $HOME not found");
+        sendError(call, ERROR_INTERNAL, "environment variable $HOME not found");
         return;
     }
 
     const auto [orgname, appname] = Application::GetID();
     const auto directory = std::filesystem::path(home) / ".local/share" / orgname / appname;
 
-    this->success(call, directory.generic_string());
+    sendSuccess(call, directory.generic_string());
 }
 
 void SqfliteAuroraPlugin::onOptionsCall(const MethodCall &call)
 {
-    const auto &args = call.GetArguments();
-    const auto level = args[ARG_LOG_LEVEL].GetInt();
+    const auto level = call.GetArgument<Encodable::Int>(ARG_LOG_LEVEL);
+    m_logger.setLogLevel(static_cast<Logger::Level>(level));
 
-    this->logger.SetLogLevel(static_cast<Logger::Level>(level));
-    this->success(call);
+    sendSuccess(call);
 }
 
 void SqfliteAuroraPlugin::onDebugCall(const MethodCall &call)
 {
-    const auto &args = call.GetArguments();
-    const auto cmd = args[ARG_COMMAND].GetString();
+    const auto cmd = call.GetArgument<Encodable::String>(ARG_COMMAND);
 
-    std::lock_guard<std::mutex> lock(this->mutex);
+    std::lock_guard<std::mutex> lock(m_mutex);
     Encodable::Map result;
 
     if (cmd == "get") {
-        if (this->logger.LogLevel() > Logger::Level::None)
-            result.emplace(ARG_LOG_LEVEL, static_cast<Encodable::Int>(this->logger.LogLevel()));
+        if (m_logger.logLevel() > Logger::Level::None)
+            result.emplace(ARG_LOG_LEVEL, static_cast<Encodable::Int>(m_logger.logLevel()));
 
-        if (!this->databases.empty()) {
+        if (!m_databases.empty()) {
             Encodable::Map databases;
 
-            for (const auto &[id, db] : this->databases) {
+            for (const auto &[id, db] : m_databases) {
                 Encodable::Map info;
 
-                info.emplace(ARG_PATH, db->Path());
-                info.emplace(ARG_SINGLE_INSTANCE, db->IsSingleInstance());
+                info.emplace(ARG_PATH, db->path());
+                info.emplace(ARG_SINGLE_INSTANCE, db->isSingleInstance());
 
-                if (db->LogLevel() > Logger::Level::None)
-                    info.emplace(ARG_LOG_LEVEL, static_cast<Encodable::Int>(db->LogLevel()));
+                if (db->logLevel() > Logger::Level::None)
+                    info.emplace(ARG_LOG_LEVEL, static_cast<Encodable::Int>(db->logLevel()));
 
                 databases.emplace(std::to_string(id), info);
             }
@@ -314,211 +304,197 @@ void SqfliteAuroraPlugin::onDebugCall(const MethodCall &call)
         }
     }
 
-    this->success(call, result);
+    sendSuccess(call, result);
 }
 
 void SqfliteAuroraPlugin::onExecuteCall(const MethodCall &call)
 {
-    const auto &args = call.GetArguments();
-
-    const auto dbID = args[ARG_ID].GetInt();
-    const auto sql = args[ARG_SQL].GetString();
-    const auto sqlArgs = GetSqlArguments(args);
-    const auto inTransactionChange = args.HasKey(ARG_IN_TRANSACTION)
-                                         ? args[ARG_IN_TRANSACTION].GetBoolean()
-                                         : false;
-    const auto transactionID = GetTransactionID(args);
+    const auto dbID = call.GetArgument<Encodable::Int>(ARG_ID);
+    const auto sql = call.GetArgument<Encodable::String>(ARG_SQL);
+    const auto inTransactionChange = call.GetArgument<Encodable::Boolean>(ARG_IN_TRANSACTION, false);
+
+    const auto sqlArgs = getSqlArguments(call.GetArguments());
+    const auto transactionID = getTransactionID(call.GetArguments());
     const auto enteringTransaction = inTransactionChange == true
                                      && transactionID == Database::TransactionID::None;
 
     const auto db = databaseByID(dbID);
 
     if (!db) {
-        this->error(call, ERROR_CLOSED, "database closed", "ID=" + std::to_string(dbID) + ")");
+        sendError(call, ERROR_CLOSED, "database closed", "ID=" + std::to_string(dbID) + ")");
         return;
     }
 
-    this->asynq.Push(
-        [this, db, sql, sqlArgs, inTransactionChange, enteringTransaction, transactionID, call] {
-            db->ProcessSqlCommand(
-                transactionID,
-                [this, db, sql, sqlArgs, inTransactionChange, enteringTransaction, call] {
-                    if (enteringTransaction)
-                        db->EnterInTransaction();
-
-                    const auto error = db->Execute(sql, sqlArgs);
-
-                    if (error) {
-                        db->LeaveTransaction();
-                        this->error(call, ERROR_INTERNAL, *error);
-                        return;
-                    }
-
-                    if (enteringTransaction) {
-                        this->success(call,
-                                      Encodable::Map{
-                                          {ARG_TRANSACTION_ID, db->CurrentTransactionID()},
-                                      });
-                        return;
-                    }
-
-                    if (inTransactionChange == false)
-                        db->LeaveTransaction();
-
-                    this->success(call);
-                });
+    m_asyncQueue.push([this,
+                       db,
+                       sql,
+                       sqlArgs,
+                       inTransactionChange,
+                       enteringTransaction,
+                       transactionID,
+                       call] {
+        db->processSqlCommand(transactionID, [this, db, sql, sqlArgs, inTransactionChange, enteringTransaction, call] {
+            if (enteringTransaction)
+                db->enterInTransaction();
+
+            const auto error = db->execute(sql, sqlArgs);
+
+            if (error) {
+                db->leaveTransaction();
+                sendError(call, ERROR_INTERNAL, error.message());
+                return;
+            }
+
+            if (enteringTransaction) {
+                sendSuccess(call, Encodable::Map{{ARG_TRANSACTION_ID, db->currentTransactionID()}});
+                return;
+            }
+
+            if (inTransactionChange == false)
+                db->leaveTransaction();
+
+            sendSuccess(call);
         });
+    });
 }
 
 void SqfliteAuroraPlugin::onQueryCall(const MethodCall &call)
 {
-    const auto &args = call.GetArguments();
-
-    const auto dbID = args[ARG_ID].GetInt();
-    const auto sql = args[ARG_SQL].GetString();
-    const auto sqlArgs = GetSqlArguments(args);
-    const auto transactionID = GetTransactionID(args);
-    const auto pageSize = args.HasKey(ARG_CURSOR_PAGE_SIZE) ? args[ARG_CURSOR_PAGE_SIZE].GetInt()
-                                                            : -1;
+    const auto dbID = call.GetArgument<Encodable::Int>(ARG_ID);
+    const auto sql = call.GetArgument<Encodable::String>(ARG_SQL);
+    const auto pageSize = call.GetArgument<Encodable::Int>(ARG_CURSOR_PAGE_SIZE, -1);
+
+    const auto sqlArgs = getSqlArguments(call.GetArguments());
+    const auto transactionID = getTransactionID(call.GetArguments());
     const auto db = databaseByID(dbID);
 
     if (!db) {
-        this->error(call, ERROR_CLOSED, "database closed", "ID=" + std::to_string(dbID) + ")");
+        sendError(call, ERROR_CLOSED, "database closed", "ID=" + std::to_string(dbID) + ")");
         return;
     }
 
-    this->asynq.Push([this, db, sql, sqlArgs, transactionID, pageSize, call] {
-        db->ProcessSqlCommand(transactionID, [this, db, sql, sqlArgs, pageSize, call] {
+    m_asyncQueue.push([this, db, sql, sqlArgs, transactionID, pageSize, call] {
+        db->processSqlCommand(transactionID, [this, db, sql, sqlArgs, pageSize, call] {
             Encodable::Map result;
-            std::optional<std::string> error;
+            utils::error error;
 
             if (pageSize <= 0)
-                error = db->Query(sql, sqlArgs, result);
+                error = db->query(sql, sqlArgs, result);
             else
-                error = db->QueryWithPageSize(sql, sqlArgs, pageSize, result);
+                error = db->queryWithPageSize(sql, sqlArgs, pageSize, result);
 
             if (error) {
-                this->error(call, ERROR_INTERNAL, *error);
+                sendError(call, ERROR_INTERNAL, error.message());
                 return;
             }
 
-            this->success(call, result);
+            sendSuccess(call, result);
         });
     });
 }
 
 void SqfliteAuroraPlugin::onQueryCursorNextCall(const MethodCall &call)
 {
-    const auto &args = call.GetArguments();
-
-    const auto dbID = args[ARG_ID].GetInt();
-    const auto cursorID = args[ARG_CURSOR_ID].GetInt();
-    const auto closeCursor = args.HasKey(ARG_CANCEL) ? args[ARG_CANCEL].GetBoolean() : false;
-    const auto transactionID = GetTransactionID(args);
+    const auto dbID = call.GetArgument<Encodable::Int>(ARG_ID);
+    const auto cursorID = call.GetArgument<Encodable::Int>(ARG_CURSOR_ID);
+    const auto closeCursor = call.GetArgument<Encodable::Boolean>(ARG_CANCEL, false);
 
+    const auto transactionID = getTransactionID(call.GetArguments());
     const auto db = databaseByID(dbID);
 
     if (!db) {
-        this->error(call, ERROR_CLOSED, "database closed", "ID=" + std::to_string(dbID) + ")");
+        sendError(call, ERROR_CLOSED, "database closed", "ID=" + std::to_string(dbID) + ")");
         return;
     }
 
-    this->asynq.Push([this, db, cursorID, closeCursor, transactionID, call] {
-        db->ProcessSqlCommand(transactionID, [this, db, cursorID, closeCursor, call] {
+    m_asyncQueue.push([this, db, cursorID, closeCursor, transactionID, call] {
+        db->processSqlCommand(transactionID, [this, db, cursorID, closeCursor, call] {
             Encodable::Map result;
-            const auto error = db->QueryCursorNext(cursorID, closeCursor, result);
+            const auto error = db->queryCursorNext(cursorID, closeCursor, result);
 
             if (error) {
-                this->error(call, ERROR_INTERNAL, *error);
+                sendError(call, ERROR_INTERNAL, error.message());
                 return;
             }
 
-            this->success(call, result);
+            sendSuccess(call, result);
         });
     });
 }
 
 void SqfliteAuroraPlugin::onUpdateCall(const MethodCall &call)
 {
-    const auto &args = call.GetArguments();
-
-    const auto dbID = args[ARG_ID].GetInt();
-    const auto sql = args[ARG_SQL].GetString();
-    const auto sqlArgs = GetSqlArguments(args);
-    const auto transactionID = GetTransactionID(args);
+    const auto dbID = call.GetArgument<Encodable::Int>(ARG_ID);
+    const auto sql = call.GetArgument<Encodable::String>(ARG_SQL);
 
+    const auto sqlArgs = getSqlArguments(call.GetArguments());
+    const auto transactionID = getTransactionID(call.GetArguments());
     const auto db = databaseByID(dbID);
 
     if (!db) {
-        this->error(call, ERROR_CLOSED, "database closed", "ID=" + std::to_string(dbID) + ")");
+        sendError(call, ERROR_CLOSED, "database closed", "ID=" + std::to_string(dbID) + ")");
         return;
     }
 
-    this->asynq.Push([this, db, sql, sqlArgs, transactionID, call] {
-        db->ProcessSqlCommand(transactionID, [this, db, sql, sqlArgs, call] {
+    m_asyncQueue.push([this, db, sql, sqlArgs, transactionID, call] {
+        db->processSqlCommand(transactionID, [this, db, sql, sqlArgs, call] {
             int updated = 0;
-            const auto error = db->Update(sql, sqlArgs, updated);
+            const auto error = db->update(sql, sqlArgs, updated);
 
             if (error) {
-                this->error(call, ERROR_INTERNAL, *error);
+                sendError(call, ERROR_INTERNAL, error.message());
                 return;
             }
 
-            this->success(call, updated);
+            sendSuccess(call, updated);
         });
     });
 }
 
 void SqfliteAuroraPlugin::onInsertCall(const MethodCall &call)
 {
-    const auto &args = call.GetArguments();
-
-    const auto dbID = args[ARG_ID].GetInt();
-    const auto sql = args[ARG_SQL].GetString();
-    const auto sqlArgs = GetSqlArguments(args);
-    const auto transactionID = GetTransactionID(args);
+    const auto dbID = call.GetArgument<Encodable::Int>(ARG_ID);
+    const auto sql = call.GetArgument<Encodable::String>(ARG_SQL);
 
+    const auto sqlArgs = getSqlArguments(call.GetArguments());
+    const auto transactionID = getTransactionID(call.GetArguments());
     const auto db = databaseByID(dbID);
 
     if (!db) {
-        this->error(call, ERROR_CLOSED, "database closed", "ID=" + std::to_string(dbID) + ")");
+        sendError(call, ERROR_CLOSED, "database closed", "ID=" + std::to_string(dbID) + ")");
         return;
     }
 
-    this->asynq.Push([this, db, sql, sqlArgs, transactionID, call] {
-        db->ProcessSqlCommand(transactionID, [this, db, sql, sqlArgs, call] {
+    m_asyncQueue.push([this, db, sql, sqlArgs, transactionID, call] {
+        db->processSqlCommand(transactionID, [this, db, sql, sqlArgs, call] {
             int insertID = 0;
-            const auto error = db->Insert(sql, sqlArgs, insertID);
+            const auto error = db->insert(sql, sqlArgs, insertID);
 
             if (error) {
-                this->error(call, ERROR_INTERNAL, *error);
+                sendError(call, ERROR_INTERNAL, error.message());
                 return;
             }
 
             if (insertID == 0)
-                this->success(call);
+                sendSuccess(call);
             else
-                this->success(call, insertID);
+                sendSuccess(call, insertID);
         });
     });
 }
 
 void SqfliteAuroraPlugin::onBatchCall(const MethodCall &call)
 {
-    const auto &args = call.GetArguments();
-
-    const auto dbID = args[ARG_ID].GetInt();
-    const auto &operations = args[ARG_OPERATIONS].GetList();
-    const auto noResult = args.HasKey(ARG_NO_RESULT) ? args[ARG_NO_RESULT].GetBoolean() : false;
-    const auto continueOnError = args.HasKey(ARG_CONTINUE_ON_ERROR)
-                                     ? args[ARG_CONTINUE_ON_ERROR].GetBoolean()
-                                     : false;
-    const auto transactionID = GetTransactionID(args);
+    const auto dbID = call.GetArgument<Encodable::Int>(ARG_ID);
+    const auto &operations = call.GetArgument<Encodable::List>(ARG_OPERATIONS);
+    const auto noResult = call.GetArgument<Encodable::Boolean>(ARG_NO_RESULT, false);
+    const auto continueOnError = call.GetArgument<Encodable::Boolean>(ARG_CONTINUE_ON_ERROR, false);
 
+    const auto transactionID = getTransactionID(call.GetArguments());
     const auto db = databaseByID(dbID);
 
     if (!db) {
-        this->error(call, ERROR_CLOSED, "database closed", "ID=" + std::to_string(dbID) + ")");
+        sendError(call, ERROR_CLOSED, "database closed", "ID=" + std::to_string(dbID) + ")");
         return;
     }
 
@@ -527,80 +503,80 @@ void SqfliteAuroraPlugin::onBatchCall(const MethodCall &call)
     for (const auto &operation : operations) {
         const auto method = operation[ARG_METHOD].GetString();
         const auto sql = operation[ARG_SQL].GetString();
-        const auto sqlArgs = GetSqlArguments(operation);
+        const auto sqlArgs = getSqlArguments(operation);
 
         dbOperations.emplace_back(Database::Operation{method, sql, sqlArgs});
     }
 
-    this->asynq.Push([this, db, dbOperations, transactionID, continueOnError, noResult, call] {
+    m_asyncQueue.push([this, db, dbOperations, transactionID, continueOnError, noResult, call] {
         const auto command = [this, db, dbOperations, continueOnError, noResult, call] {
             Encodable::List results;
-            const auto error = db->Batch(dbOperations, continueOnError, results);
+            const auto error = db->batch(dbOperations, continueOnError, results);
             if (error) {
-                this->error(call, ERROR_INTERNAL, *error);
+                sendError(call, ERROR_INTERNAL, error.message());
                 return;
             }
 
             if (noResult)
-                this->success(call);
+                sendSuccess(call);
             else
-                this->success(call, results);
+                sendSuccess(call, results);
         };
 
-        db->ProcessSqlCommand(transactionID, command);
+        db->processSqlCommand(transactionID, command);
     });
 }
 
 std::shared_ptr<Database> SqfliteAuroraPlugin::databaseByPath(const std::string &path)
 {
-    std::lock_guard<std::mutex> lock(this->mutex);
+    std::lock_guard<std::mutex> lock(m_mutex);
 
-    if (!this->singletonDatabases.count(path))
+    if (!m_singleInstanceDatabases.count(path))
         return nullptr;
 
-    return this->singletonDatabases.at(path);
+    return m_singleInstanceDatabases.at(path);
 }
 
 std::shared_ptr<Database> SqfliteAuroraPlugin::databaseByID(int64_t id)
 {
-    std::lock_guard<std::mutex> lock(this->mutex);
+    std::lock_guard<std::mutex> lock(m_mutex);
 
-    if (!this->databases.count(id))
+    if (!m_databases.count(id))
         return nullptr;
 
-    return this->databases.at(id);
+    return m_databases.at(id);
 }
 
 void SqfliteAuroraPlugin::databaseRemove(std::shared_ptr<Database> db)
 {
-    std::lock_guard<std::mutex> lock(this->mutex);
+    std::lock_guard<std::mutex> lock(m_mutex);
 
-    if (db->IsSingleInstance())
-        this->singletonDatabases.erase(db->Path());
+    if (db->isSingleInstance())
+        m_singleInstanceDatabases.erase(db->path());
 
-    this->databases.erase(db->ID());
+    m_databases.erase(db->id());
 }
 
 void SqfliteAuroraPlugin::databaseAdd(std::shared_ptr<Database> db)
 {
-    std::lock_guard<std::mutex> lock(this->mutex);
+    std::lock_guard<std::mutex> lock(m_mutex);
 
-    if (db->IsSingleInstance())
-        this->singletonDatabases.emplace(db->Path(), db);
+    if (db->isSingleInstance())
+        m_singleInstanceDatabases.emplace(db->path(), db);
 
-    this->databases.emplace(db->ID(), db);
+    m_databases.emplace(db->id(), db);
 }
 
-void SqfliteAuroraPlugin::success(const MethodCall &call, const Encodable &result)
+void SqfliteAuroraPlugin::sendSuccess(const MethodCall &call, const Encodable &result)
 {
     call.SendSuccessResponse(result);
 }
 
-void SqfliteAuroraPlugin::error(const MethodCall &call,
-                                const std::string &error,
-                                const std::string &message,
-                                const std::string &desc,
-                                const Encodable &details)
+void SqfliteAuroraPlugin::sendError(const MethodCall &call,
+                                    const std::string &error,
+                                    const std::string &message,
+                                    const std::string &desc,
+                                    const Encodable &details)
 {
     call.SendErrorResponse(ERROR_SQFLITE,
                            error + ": " + message + (desc.empty() ? "" : " (" + desc + ")"),
diff --git a/packages/sqflite/sqflite_aurora/aurora/lib/utils.cpp b/packages/sqflite/sqflite_aurora/aurora/lib/utils.cpp
new file mode 100644
index 0000000..d825ac4
--- /dev/null
+++ b/packages/sqflite/sqflite_aurora/aurora/lib/utils.cpp
@@ -0,0 +1,28 @@
+/*
+ * Copyright (c) 2023. Open Mobile Platform LLC.
+ * License: Proprietary.
+ */
+#include <sqflite_aurora/utils.h>
+
+namespace utils {
+
+error::error(std::string message)
+    : m_message(std::move(message))
+{}
+
+utils::error error::none()
+{
+    return {};
+}
+
+error::operator bool() const
+{
+    return m_message.has_value();
+}
+
+const std::string &error::message() const
+{
+    return m_message.value();
+}
+
+} /* namespace utils */