func()

in connection_go18.go [30:60]

• 27 lines of code
• 10 McCabe index (conditional complexity)

func (c *conn) BeginTx(ctx context.Context, opts driver.TxOptions) (driver.Tx, error) {

	if opts.ReadOnly {
		return nil, errors.New("read-only transactions are not supported")
	}

	var isolation isoLevel

	switch sql.IsolationLevel(opts.Isolation) {
	case sql.LevelDefault:
		isolation = isolationUseCurrent
	case sql.LevelReadUncommitted:
		isolation = isolationReadUncommitted
	case sql.LevelReadCommitted:
		isolation = isolationReadComitted
	case sql.LevelWriteCommitted:
		return nil, errors.New("LevelWriteCommitted isolation level is not supported")
	case sql.LevelRepeatableRead:
		isolation = isolationRepeatableRead
	case sql.LevelSnapshot:
		return nil, errors.New("LevelSnapshot isolation level is not supported")
	case sql.LevelSerializable:
		isolation = isolationSerializable
	case sql.LevelLinearizable:
		return nil, errors.New("LevelLinearizable isolation level is not supported")
	default:
		return nil, fmt.Errorf("unsupported transaction isolation level: %d", opts.Isolation)
	}

	return c.begin(ctx, isolation)
}