How to Use Prepared Statements in Rust

Rust does not have built-in prepared statements; you must use a database driver like sqlx or diesel to execute parameterized queries safely. Use the driver's query builder to bind variables to placeholders, preventing SQL injection without manual string concatenation.

use sqlx::SqlitePool;

async fn get_user(pool: &SqlitePool, user_id: i32) -> Result<Option<String>, sqlx::Error> {
    let name = sqlx::query_scalar::<_, String>("SELECT name FROM users WHERE id = ?")
        .bind(user_id)
        .fetch_optional(pool)
        .await?;
    Ok(name)
}

Prepared statements are a safety feature that separates your code from the data you send to a database. Think of it like filling out a form where the questions are fixed, but your answers can change; this prevents hackers from tricking the system by typing code instead of answers. In Rust, you rely on external libraries to handle this separation automatically.