Go Academy · Lesson

pgx: High-Performance PostgreSQL Driver

pgxpool, Copy protocol, and batch queries

pgx: High-Performance PostgreSQL Driver is a free Go Academy lesson on CoddyKit — lesson 3 of 4. You can read the complete lesson below for free — then practise it hands-on in the browser with a built-in code editor and a 24/7 AI tutor. It is part of the Go Academy learning path, one of 4 lessons in the course, and your progress syncs across the web and the CoddyKit app.

What is pgx?

github.com/jackc/pgx/v5 is a PostgreSQL-specific Go driver with a native API that supports advanced PostgreSQL features unavailable in database/sql: COPY protocol, notifications, prepared statement caching, and more.

Connecting with pgx

Use pgx's native pool or database/sql compatibility layer:

// Native pgx pool
pool, err := pgxpool.New(ctx, "postgres://user:pass@localhost/mydb")
if err != nil { log.Fatal(err) }
defer pool.Close()

pgxpool

pgxpool.New creates a managed connection pool. Configure it with a parse config:

config, _ := pgxpool.ParseConfig("postgres://...")
config.MaxConns = 10
pool, _ := pgxpool.NewWithConfig(ctx, config)

Querying with pgx

pgx uses pool.Query and pgx.CollectRows helper functions:

rows, _ := pool.Query(ctx, "SELECT id, name FROM users WHERE active=$1", true)
users, err := pgx.CollectRows(rows, pgx.RowToStructByName[User])

RowToStructByName

pgx.RowToStructByName maps column names to struct fields using lowercase field names or db tags, similar to sqlx Select.

Scanning a single row

Use pool.QueryRow for single-row queries:

var name string
err := pool.QueryRow(ctx, "SELECT name FROM users WHERE id=$1", id).Scan(&name)

Batch queries

pgx supports sending multiple queries in a single network round trip using pool.SendBatch:

batch := &pgx.Batch{}
batch.Queue("SELECT name FROM users WHERE id=$1", 1)
batch.Queue("SELECT name FROM users WHERE id=$1", 2)
results := pool.SendBatch(ctx, batch)
defer results.Close()

COPY protocol

For bulk inserts, pgx supports PostgreSQL's binary COPY protocol, which is much faster than individual INSERT statements:

conn, _ := pool.Acquire(ctx)
defer conn.Release()
conn.Conn().CopyFrom(ctx, pgx.Identifier{"users"}, []string{"name","email"}, pgx.CopyFromRows(rows))

Listen/Notify

pgx supports PostgreSQL's LISTEN/NOTIFY for real-time pub/sub within the DB:

conn, _ := pool.Acquire(ctx)
conn.Exec(ctx, "LISTEN events")
notification, _ := conn.Conn().WaitForNotification(ctx)
fmt.Println(notification.Payload)

pgx with database/sql

Use pgx as a database/sql driver for compatibility with existing sql-based code:

import pgxstdlib "github.com/jackc/pgx/v5/stdlib"
db := sql.OpenDB(pgxstdlib.OpenDBFromPool(pool))

pgconn for low-level

pgconn is pgx's low-level connection library exposing the raw PostgreSQL wire protocol. Use it for custom protocol work or admin tools.

Quick Check

Why is pgx's COPY protocol faster than multiple INSERT statements?

Recap: pgx

Key points:

pgxpool for managed connection pool; configure with MaxConns
CollectRows + RowToStructByName for ergonomic scanning
SendBatch for multiple queries in one round trip
CopyFrom for high-throughput bulk inserts

Frequently asked questions

Is the “pgx: High-Performance PostgreSQL Driver” lesson free?

Yes — the full text of “pgx: High-Performance PostgreSQL Driver” is free to read here on the web, and the Go Academy course includes 4 lessons in total. To practise it interactively (a built-in code editor and a 24/7 AI tutor) and unlock the rest of the Go Academy course, upgrade to CoddyKit PRO.

What will I learn in “pgx: High-Performance PostgreSQL Driver”?

pgxpool, Copy protocol, and batch queries You practise Go Academy with hands-on code you run directly in the browser, and a 24/7 AI tutor answers your questions as you work through the lesson.

Do I need any experience to start Go Academy?

No prior experience is required. Go Academy on CoddyKit is structured for beginners through advanced learners; this is — lesson 3 of 4, so you can start here or from the beginning and move at your own pace.

How long does the “pgx: High-Performance PostgreSQL Driver” lesson take?

Most CoddyKit lessons take about 5–10 minutes. Each one is bite-sized and interactive, so you make steady progress and pick up exactly where you left off across the web and the app.

Can I write and run code in this Go Academy lesson?

Yes. Every Go Academy lesson includes a built-in code editor, so you write and run real code right in your browser and get instant AI feedback — no local setup required.

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