Method exist

Source/Basic/Database.cpp:90–109

}

bool DB::exist(String tableName, String schema) const {
	bool existed = false;
	_thread->runInMainSync([&]() {
		if (!schema.empty() && !existDBUnsafe(_database.get(), schema)) {
			return;
		}
		try {
			SQLite::Statement statement(*_database, schema.empty() ? "SELECT EXISTS(SELECT 1 FROM sqlite_master WHERE type='table' AND name = ?)"s : fmt::format("SELECT EXISTS(SELECT 1 FROM {}.sqlite_master WHERE type='table' AND name = ?)", schema.toString()));
			statement.bind(1, tableName.toString());
			int result = 0;
			if (statement.executeStep()) {
				result = statement.getColumn(0);
			}
			existed = result == 0 ? false : true;
		} catch (std::exception& e) {
			Warn("failed to execute DB query: {}", e.what());
		}
	});
	return existed;
}

int DB::exec(String sql) {
	int rowChanged = -1;