export a database schema in rust

To export the database schema in Rust, we can use the diesel print-schema command. This command generates the table definitions and their relationships in Rust code format.

Firstly, add the diesel and dotenv crates to the dependencies in the project's Cargo.toml file:


[dependencies]
diesel = { version = "1.4.5", features = ["postgres"] }
dotenv = "0.15.0"
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Then, create a .env file in the root of your project directory, and add the database URL:


main.rs
DATABASE_URL=postgres://user:password@localhost/database_name
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The following Rust code will print the schema to the console:


main.rs
use diesel::prelude::*;
use diesel::pg::PgConnection;
use dotenv::dotenv;
use std::env;

fn main() {
    dotenv().ok();
    let database_url = env::var("DATABASE_URL").expect("DATABASE_URL must be set");
    let connection = PgConnection::establish(&database_url).expect(&format!("Error connecting to {}", database_url));

    diesel::print_schema().set(&connection);
}
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Once you run this code, it will print the database schema to the console in Rust code format, which can be copied to a file or used directly in your application.

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