jackc/pgx · error

unknown format code %d

Error message

unknown format code %d

What it means

Error "unknown format code %d" thrown in jackc/pgx.

Source

Thrown at pgtype/range_codec.go:365

	}

	return rangeScanner.SetBoundTypes(utr.LowerType, utr.UpperType)
}

func (c *RangeCodec) DecodeDatabaseSQLValue(m *Map, oid uint32, format int16, src []byte) (driver.Value, error) {
	if src == nil {
		return nil, nil
	}

	switch format {
	case TextFormatCode:
		return string(src), nil
	case BinaryFormatCode:
		buf := make([]byte, len(src))
		copy(buf, src)
		return buf, nil
	default:
		return nil, fmt.Errorf("unknown format code %d", format)
	}
}

func (c *RangeCodec) DecodeValue(m *Map, oid uint32, format int16, src []byte) (any, error) {
	if src == nil {
		return nil, nil
	}

	var r Range[any]
	err := c.PlanScan(m, oid, format, &r).Scan(src, &r)
	return r, err
}

View on GitHub (pinned to ec1a0befd2)

When it happens

Trigger: Thrown at pgtype/range_codec.go:365 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of jackc/pgx@ec1a0befd2 (2026-08-04). Data as JSON: /data/errors/8a0561f393ddc8d6.json. Report an issue: GitHub.