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row.go
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/
row.go
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// Copyright 2022 Namespace Labs Inc; All rights reserved.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
package postgres
import (
"context"
"github.com/jackc/pgx/v4"
"go.opentelemetry.io/otel/trace"
)
type hasQuery interface {
Query(context.Context, string, ...any) (pgx.Rows, error)
}
func queryRow(ctx context.Context, t trace.Tracer, q hasQuery, name, sql string, args ...any) pgx.Row {
return deferredRow{ctx, t, q, name, sql, args}
}
type deferredRow struct {
ctx context.Context
t trace.Tracer
q hasQuery
name string
sql string
args []any
}
func (d deferredRow) Scan(target ...any) error {
return withSpan(d.ctx, d.t, d.name, d.sql, func(ctx context.Context) error {
rows, err := d.q.Query(ctx, d.sql, d.args...)
if err != nil {
return err
}
defer rows.Close()
for rows.Next() {
return rows.Scan(target...)
}
return pgx.ErrNoRows
})
}