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Anson Biggs 2025-05-09 19:01:08 -06:00
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1
.env Normal file
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DATABASE_URL=postgres://postgres:mysecretpassword@localhost:5432/postgres

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.gitignore vendored Normal file
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/target

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Cargo.lock generated Normal file
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# This file is automatically @generated by Cargo.
# It is not intended for manual editing.
version = 4
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Cargo.toml Normal file
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[package]
name = "diesel_demo"
version = "0.1.0"
edition = "2024"
[dependencies]
diesel = { version = "2.2.0", features = ["postgres"] }
# build libpq and openssl as part of the build process
# uncomment these lines if you run into setup issues
pq-sys = { version = "0.6", features = ["bundled"] }
openssl-sys = { version = "0.9.100", features = ["vendored"] }
dotenvy = "0.15"

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diesel.toml Normal file
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# For documentation on how to configure this file,
# see https://diesel.rs/guides/configuring-diesel-cli
[print_schema]
file = "src/schema.rs"
custom_type_derives = ["diesel::query_builder::QueryId", "Clone"]
[migrations_directory]
dir = "/Users/ansonbiggs/Coding/diesel_demo/migrations"

0
migrations/.keep Normal file
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migrations/00000000000000_diesel_initial_setup/down.sql Normal file
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-- This file was automatically created by Diesel to setup helper functions
-- and other internal bookkeeping. This file is safe to edit, any future
-- changes will be added to existing projects as new migrations.
DROP FUNCTION IF EXISTS diesel_manage_updated_at(_tbl regclass);
DROP FUNCTION IF EXISTS diesel_set_updated_at();

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migrations/00000000000000_diesel_initial_setup/up.sql Normal file
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-- This file was automatically created by Diesel to setup helper functions
-- and other internal bookkeeping. This file is safe to edit, any future
-- changes will be added to existing projects as new migrations.
-- Sets up a trigger for the given table to automatically set a column called
-- `updated_at` whenever the row is modified (unless `updated_at` was included
-- in the modified columns)
--
-- # Example
--
-- ```sql
-- CREATE TABLE users (id SERIAL PRIMARY KEY, updated_at TIMESTAMP NOT NULL DEFAULT NOW());
--
-- SELECT diesel_manage_updated_at('users');
-- ```
CREATE OR REPLACE FUNCTION diesel_manage_updated_at(_tbl regclass) RETURNS VOID AS $$
BEGIN
EXECUTE format('CREATE TRIGGER set_updated_at BEFORE UPDATE ON %s
FOR EACH ROW EXECUTE PROCEDURE diesel_set_updated_at()', _tbl);
END;
$$ LANGUAGE plpgsql;
CREATE OR REPLACE FUNCTION diesel_set_updated_at() RETURNS trigger AS $$
BEGIN
IF (
NEW IS DISTINCT FROM OLD AND
NEW.updated_at IS NOT DISTINCT FROM OLD.updated_at
) THEN
NEW.updated_at := current_timestamp;
END IF;
RETURN NEW;
END;
$$ LANGUAGE plpgsql;

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migrations/2025-05-10-003345_create_posts/down.sql Normal file
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-- This file should undo anything in `up.sql`
DROP TABLE posts

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migrations/2025-05-10-003345_create_posts/up.sql Normal file
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-- Your SQL goes here
CREATE TABLE posts (
id SERIAL PRIMARY KEY,
title VARCHAR NOT NULL,
body TEXT NOT NULL,
published BOOLEAN NOT NULL DEFAULT FALSE
)

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migrations/2025-05-10-003713_create_posts/down.sql Normal file
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-- This file should undo anything in `up.sql`

2
migrations/2025-05-10-003713_create_posts/up.sql Normal file
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-- Your SQL goes here

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src/bin/show_posts.rs Normal file
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use self::models::*;
use diesel::prelude::*;
use diesel_demo::*;
fn main() {
use self::schema::posts::dsl::*;
let connection = &mut establish_connection();
let results = posts
.filter(published.eq(true))
.limit(5)
.select(Post::as_select())
.load(connection)
.expect("Error loading posts");
println!("Displaying {} posts", results.len());
for post in results {
println!("{}", post.title);
println!("-----------\n");
println!("{}", post.body);
}
}

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src/lib.rs Normal file
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use diesel::prelude::*;
use dotenvy::dotenv;
use std::env;
pub mod models;
pub mod schema;
pub fn establish_connection() -> PgConnection {
dotenv().ok();
let database_url = env::var("DATABASE_URL").expect("DATABASE_URL must be set");
PgConnection::establish(&database_url).unwrap_or_else(
|_| panic!("Error connecting to {}", database_url)
)
}

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src/models.rs Normal file
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use diesel::prelude::*;
#[derive(Queryable, Selectable)]
#[diesel(table_name = crate::schema::posts)]
#[diesel(check_for_backend(diesel::pg::Pg))]
pub struct Post {
pub id: i32,
pub title: String,
pub body: String,
pub published: bool,
}

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src/schema.rs Normal file
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// @generated automatically by Diesel CLI.
diesel::table! {
posts (id) {
id -> Int4,
title -> Varchar,
body -> Text,
published -> Bool,
}
}