sqlx: initial commit w/ todos example

Cargo.toml

@@ -19,6 +19,8 @@ members = [
   "libsql-wal",
   "libsql-storage",
   "libsql-storage-server",
+  "sqlx-libsql",
+  "sqlx-libsql/examples/todos"
 ]
 
 exclude = [

sqlx-libsql/Cargo.toml

@@ -0,0 +1,11 @@
+[package]
+name = "sqlx-libsql"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+libsql = { version = "0.6", path = "../libsql" }
+sqlx-core = "=0.8.2"
+futures-core = "0.3"
+futures-util = "0.3"
+log = "0.4"

sqlx-libsql/examples/todos/Cargo.toml

@@ -0,0 +1,14 @@
+[package]
+name = "sqlx-example-sqlite-todos"
+version = "0.1.0"
+edition = "2021"
+publish = false
+workspace = "../../../"
+
+[dependencies]
+anyhow = "1.0"
+futures = "0.3"
+sqlx = { version = "0.8", features = [ "runtime-tokio", "tls-native-tls" ] }
+sqlx-libsql = { path = "../.." }
+clap = { version = "4", features = ["derive"] }
+tokio = { version = "1.20.0", features = ["rt", "macros"]}

sqlx-libsql/examples/todos/README.md

@@ -0,0 +1,41 @@
+# TODOs Example
+
+## Setup
+
+1. Declare the database URL
+
+    ```
+    export DATABASE_URL="sqlite:todos.db"
+    ```
+
+2. Create the database.
+
+    ```
+    $ sqlx db create
+    ```
+
+3. Run sql migrations
+
+    ```
+    $ sqlx migrate run
+    ```
+
+## Usage
+
+Add a todo 
+
+```
+cargo run -- add "todo description"
+```
+
+Complete a todo.
+
+```
+cargo run -- done <todo id>
+```
+
+List all todos
+
+```
+cargo run
+```

sqlx-libsql/examples/todos/migrations/20200718111257_todos.sql

@@ -0,0 +1,6 @@
+CREATE TABLE IF NOT EXISTS todos
+(
+    id          INTEGER PRIMARY KEY NOT NULL,
+    description TEXT                NOT NULL,
+    done        BOOLEAN             NOT NULL DEFAULT 0
+);

sqlx-libsql/examples/todos/src/main.rs

@@ -0,0 +1,101 @@
+use clap::{Parser, Subcommand};
+use sqlx_libsql::LibsqlPool;
+use std::env;
+
+#[derive(Parser)]
+struct Args {
+    #[command(subcommand)]
+    cmd: Option<Command>,
+}
+
+#[derive(Subcommand)]
+enum Command {
+    Add { description: String },
+    Done { id: i64 },
+}
+
+#[tokio::main(flavor = "current_thread")]
+async fn main() -> anyhow::Result<()> {
+    let args = Args::parse();
+    let pool = LibsqlPool::connect(&env::var("DATABASE_URL")?).await?;
+
+    match args.cmd {
+        Some(Command::Add { description }) => {
+            println!("Adding new todo with description '{description}'");
+            let todo_id = add_todo(&pool, description).await?;
+            println!("Added new todo with id {todo_id}");
+        }
+        Some(Command::Done { id }) => {
+            println!("Marking todo {id} as done");
+            if complete_todo(&pool, id).await? {
+                println!("Todo {id} is marked as done");
+            } else {
+                println!("Invalid id {id}");
+            }
+        }
+        None => {
+            println!("Printing list of all todos");
+            list_todos(&pool).await?;
+        }
+    }
+
+    Ok(())
+}
+
+async fn add_todo(pool: &LibsqlPool, description: String) -> anyhow::Result<i64> {
+    let mut conn = pool.acquire().await?;
+
+    // Insert the task, then obtain the ID of this row
+    let id = sqlx::query(
+        r#"
+INSERT INTO todos ( description )
+VALUES ( ?1 )
+        "#,
+    )
+    .bind(description)
+    .execute(&mut *conn)
+    .await?
+    .last_insert_rowid();
+
+    Ok(id)
+}
+
+async fn complete_todo(pool: &LibsqlPool, id: i64) -> anyhow::Result<bool> {
+    let rows_affected = sqlx::query(
+        r#"
+UPDATE todos
+SET done = TRUE
+WHERE id = ?1
+        "#,
+    )
+    .bind(id)
+    .execute(pool)
+    .await?
+    .rows_affected();
+
+    Ok(rows_affected > 0)
+}
+
+async fn list_todos(pool: &LibsqlPool) -> anyhow::Result<()> {
+    let recs = sqlx::query(
+        r#"
+SELECT id, description, done
+FROM todos
+ORDER BY id
+        "#,
+    )
+    .fetch_all(pool)
+    .await?;
+
+    for _rec in recs {
+        // TODO(lucio): impl this
+        // println!(
+        //     "- [{}] {}: {}",
+        //     if rec.done { "x" } else { " " },
+        //     rec.id,
+        //     &rec.description,
+        // );
+    }
+
+    Ok(())
+}