如何在查询中动态插入列名！Rust的sqlx中的宏

use sqlx::query;

#[derive(sqlx::FromRow)]
struct User {
    id: i32,
    name: String,
    age: i32,
}

#[tokio::main]
async fn main() -> Result<(), sqlx::Error> {
    let column_name = "name"; // 动态指定的列名

    let query = query!(
        "SELECT id, $column_name as name, age FROM users",
        column_name = column_name
    );

    let pool = sqlx::PgPool::connect("postgres://username:password@localhost/database")
        .await?;

    let users: Vec<User> = query.fetch_all(&pool).await?;

    for user in users {
        println!("ID: {}, Name: {}, Age: {}", user.id, user.name, user.age);
    }

    Ok(())
}