jackc/pgx · error

unsupported isolation: %v

Error message

unsupported isolation: %v

What it means

Error "unsupported isolation: %v" thrown in jackc/pgx.

Source

Thrown at stdlib/sql.go:473

func (c *Conn) BeginTx(ctx context.Context, opts driver.TxOptions) (driver.Tx, error) {
	if c.conn.IsClosed() {
		return nil, driver.ErrBadConn
	}

	var pgxOpts pgx.TxOptions
	switch sql.IsolationLevel(opts.Isolation) {
	case sql.LevelDefault:
	case sql.LevelReadUncommitted:
		pgxOpts.IsoLevel = pgx.ReadUncommitted
	case sql.LevelReadCommitted:
		pgxOpts.IsoLevel = pgx.ReadCommitted
	case sql.LevelRepeatableRead, sql.LevelSnapshot:
		pgxOpts.IsoLevel = pgx.RepeatableRead
	case sql.LevelSerializable:
		pgxOpts.IsoLevel = pgx.Serializable
	default:
		return nil, fmt.Errorf("unsupported isolation: %v", opts.Isolation)
	}

	if opts.ReadOnly {
		pgxOpts.AccessMode = pgx.ReadOnly
	}

	tx, err := c.conn.BeginTx(ctx, pgxOpts)
	if err != nil {
		return nil, err
	}

	return wrapTx{ctx: ctx, tx: tx}, nil
}

func (c *Conn) ExecContext(ctx context.Context, query string, argsV []driver.NamedValue) (driver.Result, error) {
	if c.conn.IsClosed() {
		return nil, driver.ErrBadConn
	}

View on GitHub (pinned to ec1a0befd2)

When it happens

Trigger: Thrown at stdlib/sql.go:473 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/8aeca0e4e729a155.json. Report an issue: GitHub.