From 33fbe778e731ddd3b9ded36efa2d8b4e9c1fd188 Mon Sep 17 00:00:00 2001
From: mace <safemind@posteo.net>
Date: Fri, 31 Mar 2023 18:14:48 +0200
Subject: [PATCH] first working version

---
 Cargo.lock             | 1659 ++++++++++++++++++++++++++++++++++++++++
 Cargo.toml             |    4 +
 src/config/database.rs |   60 ++
 src/config/mod.rs      |    1 +
 src/main.rs            |   57 +-
 5 files changed, 1779 insertions(+), 2 deletions(-)
 create mode 100644 Cargo.lock
 create mode 100644 src/config/database.rs
 create mode 100644 src/config/mod.rs

diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..5e1d81b
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,1659 @@
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diff --git a/Cargo.toml b/Cargo.toml
index 81bf9a6..47979fe 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -6,3 +6,7 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+directories = "5.0.0"
+dotenv = "0.15.0"
+mysql = "23.0.1"
+sprintf = "0.1.3"
diff --git a/src/config/database.rs b/src/config/database.rs
new file mode 100644
index 0000000..df3c75f
--- /dev/null
+++ b/src/config/database.rs
@@ -0,0 +1,60 @@
+use mysql::{Pool, PooledConn, Opts};
+use sprintf::sprintf;
+use std::{env, path::PathBuf};
+
+use directories::BaseDirs;
+
+#[derive(Debug)]
+pub struct Db {
+    location: String,
+    user: String,
+    port: String,
+    password: String,
+    db_name: String,
+}
+
+impl Db {
+    pub fn initialize() -> Self {
+        let base_dir: BaseDirs = match BaseDirs::new() {
+            Some(dirs) => dirs,
+            None => panic!("No config folder found."),
+        };
+
+        let config_file_path: PathBuf = base_dir.config_dir().join("rcc/.env");
+
+        match dotenv::from_path(config_file_path.as_path()) {
+            Ok(env) => env,
+            Err(_) => panic!("Could not load .env file {:?}", config_file_path.as_path()),
+        };
+
+        Db {
+            location: env::var("LOCATION").unwrap_or_else(|_| "localhost".to_string()),
+            user: env::var("USERNAME").unwrap(),
+            port: env::var("PORT").unwrap_or_else(|_| "3306".to_string()),
+            password: env::var("PASSWORD").unwrap(),
+            db_name: env::var("DB").unwrap_or_else(|_| "efulfilment".to_string()),
+        }
+    }
+
+    pub fn get_connection(&self) -> PooledConn {
+        let url = sprintf!(
+            "mysql://%s:%s@%s:%s/%s",
+            self.user,
+            self.password,
+            self.location,
+            self.port,
+            self.db_name
+        ).unwrap();
+
+        let pool = match Pool::new(Opts::from_url(&url).unwrap()) {
+            Ok(p) => p,
+            Err(e) => panic!("Cannot initialiaz pool: {e}"),
+        };
+        let conn: PooledConn = match pool.get_conn() {
+            Ok(db) => db,
+            Err(_) => panic!("Cannot connect to DB"),
+        };
+
+        conn
+    }
+}
diff --git a/src/config/mod.rs b/src/config/mod.rs
new file mode 100644
index 0000000..8fd0a6b
--- /dev/null
+++ b/src/config/mod.rs
@@ -0,0 +1 @@
+pub mod database;
diff --git a/src/main.rs b/src/main.rs
index e7a11a9..2e14583 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,3 +1,56 @@
-fn main() {
-    println!("Hello, world!");
+use config::database::Db;
+use mysql::{prelude::Queryable, PooledConn, params};
+
+pub mod config;
+
+#[derive(Debug, PartialEq, Eq)]
+struct Payment {
+    customer_id: i32,
+    amount: i32,
+    account_name: Option<String>,
+}
+
+fn main() -> std::result::Result<(), Box<dyn std::error::Error>> {
+    let db = Db::initialize();
+
+    let mut conn: PooledConn = db.get_connection();
+    conn.query_drop(
+        r"CREATE TEMPORARY TABLE payment (
+            customer_id int not null,
+            amount int not null,
+            account_name text
+        )")?;
+
+    let payments = vec![
+        Payment { customer_id: 1, amount: 2, account_name: None },
+        Payment { customer_id: 3, amount: 4, account_name: Some("foo".into()) },
+        Payment { customer_id: 5, amount: 6, account_name: None },
+        Payment { customer_id: 7, amount: 8, account_name: None },
+        Payment { customer_id: 9, amount: 10, account_name: Some("bar".into()) },
+    ];
+
+    // Now let's insert payments to the database
+    conn.exec_batch(
+        r"INSERT INTO payment (customer_id, amount, account_name)
+          VALUES (:customer_id, :amount, :account_name)",
+        payments.iter().map(|p| params! {
+            "customer_id" => p.customer_id,
+            "amount" => p.amount,
+            "account_name" => &p.account_name,
+        })
+    )?;
+
+    // Let's select payments from database. Type inference should do the trick here.
+    let selected_payments = conn
+        .query_map(
+            "SELECT customer_id, amount, account_name from payment",
+            |(customer_id, amount, account_name)| {
+                Payment { customer_id, amount, account_name }
+            },
+        )?;
+    for payment in selected_payments {
+        println!("{:?}", payment);
+    }
+
+    Ok(())
 }