SQLx + PostgreSQL v17 Development Guide

Compile-time Checked Queries

// query_as! (type-safe)
let user = sqlx::query_as!(
    User,
    r#"SELECT id, name, email, role as "role: UserRole" FROM users WHERE id = $1"#,
    id
).fetch_one(&pool).await?;

// Single column
let count = sqlx::query_scalar!("SELECT COUNT(*) FROM users WHERE active = true")
    .fetch_one(&pool).await?;