github.com/jackc/pgx/v5 v5.10.0: Batch

Clean-room public code sample — generation instructions

Write a brand-new, minimal, self-contained code sample in this clean-room directory.
Do not copy, paraphrase, or reference any existing project source. Work only from this spec.

A csx.json manifest scaffold already exists. Do not recreate it from memory. Preserve its case.goal, packages and symbols; fill its empty case.contract with exact assertions and correct its environment, commands and verifierAdapter for the files you generate.

Goal: verify github.com/jackc/pgx/v5.Batch in pkg:golang/github.com/jackc/pgx/v5@v5.10.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/github.com/jackc/pgx/v5@v5.10.0
Demonstrate these symbols/APIs:
  - github.com/jackc/pgx/v5.Batch

Rules:
  - One focused purpose; the smallest project that proves the goal.
  - Include a contract test (test/contract.*) that runs OFFLINE and exits 0 exactly when the goal behavior works.
  - Pin every dependency with a lockfile so resolution is reproducible.
  - No secrets, credentials, or tokens. No real URLs (only example.com or localhost). No absolute paths.
  - No personal names, emails, company names, or project identifiers of any kind.
  - No binaries and no generated output (node_modules, dist, target, venv, .git, .env).
  - Keep it under 200 files and 256KB packed.

{"case":{"caseId":"case:sha256:f8cb54e15a1fc31020cf21403f63d301c0c729b741e282e2e0f22f1c17ccf3ed","contract":["pgx.Batch initializes with zero length","b.Queue queues a statement without arguments and returns QueuedQuery","b.Queue queues a parameterized statement with arguments","b.Queue increments batch length with each queued statement"],"goal":"verify github.com/jackc/pgx/v5.Batch in pkg:golang/github.com/jackc/pgx/v5@v5.10.0","kind":"HOW","packages":["pkg:golang/github.com/jackc/pgx/v5@v5.10.0"],"schemaVersion":1,"symbols":["github.com/jackc/pgx/v5.Batch"]},"contractCommand":["go","run","./test"],"environment":{"arch":"x64","ecosystem":"golang","os":"windows","osVersionBucket":"11","packageManager":"go","schemaVersion":1},"license":"MIT-0","packages":["pkg:golang/github.com/jackc/pgx/v5@v5.10.0"],"schemaVersion":1,"symbols":["github.com/jackc/pgx/v5.Batch"],"verifierAdapter":"golang@1"}

module sample

go 1.25.0

require github.com/jackc/pgx/v5 v5.10.0

require (
	github.com/jackc/pgpassfile v1.0.0 // indirect
	github.com/jackc/pgservicefile v0.0.0-20240606120523-5a60cdf6a761 // indirect
	golang.org/x/text v0.29.0 // indirect
)

github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/jackc/pgpassfile v1.0.0 h1:/6Hmqy13Ss2zCq62VdNG8tM1wchn8zjSGOBJ6icpsIM=
github.com/jackc/pgpassfile v1.0.0/go.mod h1:CEx0iS5ambNFdcRtxPj5JhEz+xB6uRky5eyVu/W2HEg=
github.com/jackc/pgservicefile v0.0.0-20240606120523-5a60cdf6a761 h1:iCEnooe7UlwOQYpKFhBabPMi4aNAfoODPEFNiAnClxo=
github.com/jackc/pgservicefile v0.0.0-20240606120523-5a60cdf6a761/go.mod h1:5TJZWKEWniPve33vlWYSoGYefn3gLQRzjfDlhSJ9ZKM=
github.com/jackc/pgx/v5 v5.10.0 h1:VhSvgU2jSli8o3AqIEOTJr7rZwAEUVo4E4XhR94Zfr0=
github.com/jackc/pgx/v5 v5.10.0/go.mod h1:mal1tBGAFfLHvZzaYh77YS/eC6IX9OWbRV1QIIM0Jn4=
github.com/jackc/puddle/v2 v2.2.2 h1:PR8nw+E/1w0GLuRFSmiioY6UooMp6KJv0/61nB7icHo=
github.com/jackc/puddle/v2 v2.2.2/go.mod h1:vriiEXHvEE654aYKXXjOvZM39qJ0q+azkZFrfEOc3H4=
github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
github.com/stretchr/testify v1.11.1 h1:7s2iGBzp5EwR7/aIZr8ao5+dra3wiQyKjjFuvgVKu7U=
github.com/stretchr/testify v1.11.1/go.mod h1:wZwfW3scLgRK+23gO65QZefKpKQRnfz6sD981Nm4B6U=
golang.org/x/sync v0.17.0 h1:l60nONMj9l5drqw6jlhIELNv9I0A4OFgRsG9k2oT9Ug=
golang.org/x/sync v0.17.0/go.mod h1:9KTHXmSnoGruLpwFjVSX0lNNA75CykiMECbovNTZqGI=
golang.org/x/text v0.29.0 h1:1neNs90w9YzJ9BocxfsQNHKuAT4pkghyXc4nhZ6sJvk=
golang.org/x/text v0.29.0/go.mod h1:7MhJOA9CD2qZyOKYazxdYMF85OwPdEr9jTtBpO7ydH4=
gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

{
  "schemaVersion": 1,
  "goal": "verify github.com/jackc/pgx/v5.Batch in pkg:golang/github.com/jackc/pgx/v5@v5.10.0",
  "kind": "HOW",
  "packages": [
    "pkg:golang/github.com/jackc/pgx/v5@v5.10.0"
  ],
  "symbols": [
    "github.com/jackc/pgx/v5.Batch"
  ]
}

package main

import (
	"fmt"
	"os"

	"github.com/jackc/pgx/v5"
)

func main() {
	// 1. Verify pgx.Batch initialization and initial length
	var b pgx.Batch
	if b.Len() != 0 {
		fmt.Fprintf(os.Stderr, "expected initial batch length 0, got %d\n", b.Len())
		os.Exit(1)
	}

	// 2. Verify b.Queue queues a query without arguments and returns QueuedQuery
	q1 := b.Queue("SELECT 1")
	if q1 == nil {
		fmt.Fprintf(os.Stderr, "expected non-nil QueuedQuery from Queue\n")
		os.Exit(1)
	}
	if q1.SQL != "SELECT 1" {
		fmt.Fprintf(os.Stderr, "expected SQL 'SELECT 1', got '%s'\n", q1.SQL)
		os.Exit(1)
	}
	if len(q1.Arguments) != 0 {
		fmt.Fprintf(os.Stderr, "expected 0 arguments, got %d\n", len(q1.Arguments))
		os.Exit(1)
	}
	if b.Len() != 1 {
		fmt.Fprintf(os.Stderr, "expected batch length 1, got %d\n", b.Len())
		os.Exit(1)
	}

	// 3. Verify b.Queue queues a parameterized query with arguments
	q2 := b.Queue("INSERT INTO items (name, count) VALUES ($1, $2)", "widget", 10)
	if q2 == nil {
		fmt.Fprintf(os.Stderr, "expected non-nil QueuedQuery for parameterized query\n")
		os.Exit(1)
	}
	if q2.SQL != "INSERT INTO items (name, count) VALUES ($1, $2)" {
		fmt.Fprintf(os.Stderr, "expected SQL matching queued statement, got '%s'\n", q2.SQL)
		os.Exit(1)
	}
	if len(q2.Arguments) != 2 || q2.Arguments[0] != "widget" || q2.Arguments[1] != 10 {
		fmt.Fprintf(os.Stderr, "expected arguments ['widget', 10], got %v\n", q2.Arguments)
		os.Exit(1)
	}
	if b.Len() != 2 {
		fmt.Fprintf(os.Stderr, "expected batch length 2, got %d\n", b.Len())
		os.Exit(1)
	}

	// 4. Verify b.Queue increments batch length with each queued statement
	q3 := b.Queue("UPDATE items SET count = count - $1 WHERE name = $2", 2, "widget")
	if q3 == nil {
		fmt.Fprintf(os.Stderr, "expected non-nil QueuedQuery\n")
		os.Exit(1)
	}
	if b.Len() != 3 {
		fmt.Fprintf(os.Stderr, "expected batch length 3, got %d\n", b.Len())
		os.Exit(1)
	}

	fmt.Println("github.com/jackc/pgx/v5.Batch contract verified successfully")
}