jackc/pgx · error

cannot scan %T

Error message

cannot scan %T

What it means

Error "cannot scan %T" thrown in jackc/pgx.

Source

Thrown at pgtype/text.go:49

}

// Scan implements the [database/sql.Scanner] interface.
func (dst *Text) Scan(src any) error {
	if src == nil {
		*dst = Text{}
		return nil
	}

	switch src := src.(type) {
	case string:
		*dst = Text{String: src, Valid: true}
		return nil
	case []byte:
		*dst = Text{String: string(src), Valid: true}
		return nil
	}

	return fmt.Errorf("cannot scan %T", src)
}

// Value implements the [database/sql/driver.Valuer] interface.
func (src Text) Value() (driver.Value, error) {
	if !src.Valid {
		return nil, nil
	}
	return src.String, nil
}

// MarshalJSON implements the [encoding/json.Marshaler] interface.
func (src Text) MarshalJSON() ([]byte, error) {
	if !src.Valid {
		return []byte("null"), nil
	}

	return json.Marshal(src.String)
}

View on GitHub (pinned to ec1a0befd2)

When it happens

Trigger: Thrown at pgtype/text.go:49 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/455b2d49e755e549.json. Report an issue: GitHub.