jackc/pgx · error

expected %d arguments, got %d

Error message

expected %d arguments, got %d

What it means

Error "expected %d arguments, got %d" thrown in jackc/pgx.

Source

Thrown at conn.go:826

	}

	c.eqb.reset()
	rows := c.getRows(ctx, sql, args)

	var err error
	sd, explicitPreparedStatement := c.preparedStatements[sql]
	switch {
	case sd != nil || mode == QueryExecModeCacheStatement || mode == QueryExecModeCacheDescribe || mode == QueryExecModeDescribeExec:
		if sd == nil {
			sd, err = c.getStatementDescription(ctx, mode, sql)
			if err != nil {
				rows.fatal(err)
				return rows, err
			}
		}

		if len(sd.ParamOIDs) != len(args) {
			rows.fatal(fmt.Errorf("expected %d arguments, got %d", len(sd.ParamOIDs), len(args)))
			return rows, rows.err
		}

		rows.sql = sd.SQL

		err = c.eqb.Build(c.typeMap, sd, args)
		if err != nil {
			rows.fatal(err)
			return rows, rows.err
		}

		if resultFormatsByOID != nil {
			resultFormats = make([]int16, len(sd.Fields))
			for i := range resultFormats {
				resultFormats[i] = resultFormatsByOID[sd.Fields[i].DataTypeOID]
			}
		}

View on GitHub (pinned to ec1a0befd2)

When it happens

Trigger: Thrown at conn.go:826 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/32642c108e738433.json. Report an issue: GitHub.