googleapis/mcp-toolbox · error

unable to retrieve rows column name: %w

Error message

unable to retrieve rows column name: %w

What it means

Error "unable to retrieve rows column name: %w" thrown in googleapis/mcp-toolbox.

Source

Thrown at internal/sources/mysql/mysql.go:141

func (s *Source) RetrieveSourceVersion(ctx context.Context) (string, error) {
	var version string
	if err := s.MySQLPool().QueryRowContext(ctx, "SELECT VERSION()").Scan(&version); err != nil {
		return "", err
	}
	return version, nil
}

func (s *Source) RunSQL(ctx context.Context, statement string, params []any) (any, error) {
	statement = sqlcommenter.PrependComment(ctx, statement, SourceType, s.SQLCommenter)
	results, err := s.MySQLPool().QueryContext(ctx, statement, params...)
	if err != nil {
		return nil, fmt.Errorf("unable to execute query: %w", err)
	}
	defer results.Close()

	cols, err := results.Columns()
	if err != nil {
		return nil, fmt.Errorf("unable to retrieve rows column name: %w", err)
	}

	// create an array of values for each column, which can be re-used to scan each row
	rawValues := make([]any, len(cols))
	values := make([]any, len(cols))
	for i := range rawValues {
		values[i] = &rawValues[i]
	}

	colTypes, err := results.ColumnTypes()
	if err != nil {
		return nil, fmt.Errorf("unable to get column types: %w", err)
	}

	out := []any{}
	for results.Next() {
		err := results.Scan(values...)
		if err != nil {

View on GitHub (pinned to 8cc6e09de2)

When it happens

Trigger: Thrown at internal/sources/mysql/mysql.go:141 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of googleapis/mcp-toolbox@8cc6e09de2 (2026-09-05). Data as JSON: /api/errors/461d17e25bf344e7. Report an issue: GitHub.