Remove example playground and add a small example, a todo cli

Cargo.toml

@@ -1,3 +1,9 @@
+[workspace]
+members = [
+    ".",
+    "examples/todo"
+]
+
 [package]
 name = "sqlx"
 version = "0.0.0"
@@ -22,5 +28,4 @@ memchr = "2.2.1"
 runtime = { version = "=0.3.0-alpha.6", default-features = false }
 
 [dev-dependencies]
-env_logger = "0.6.2"
+runtime = { version = "=0.3.0-alpha.6", default-features = true }
-runtime-tokio = { version = "=0.3.0-alpha.5" }

examples/postgres.rs

@@ -1,71 +0,0 @@
-#![feature(async_await)]
-
-use futures::{future, TryStreamExt};
-use sqlx::{postgres::Connection, ConnectOptions};
-use std::{collections::HashMap, io};
-
-// TODO: Connection strings ala postgres@localhost/sqlx_dev
-
-#[runtime::main(runtime_tokio::Tokio)]
-async fn main() -> io::Result<()> {
-    env_logger::init();
-
-    let mut conn = Connection::establish(
-        ConnectOptions::new()
-            .host("127.0.0.1")
-            .port(5432)
-            .user("postgres")
-            .database("sqlx__dev"),
-    )
-    .await?;
-
-    println!(" :: create schema");
-
-    conn.prepare(
-        r#"
-CREATE TABLE IF NOT EXISTS users (
-    id BIGSERIAL PRIMARY KEY,
-    name TEXT NOT NULL,
-    password TEXT
-);
-        "#,
-    )
-    .execute()
-    .await?;
-
-    println!(" :: insert");
-
-    let user_id: i64 = conn
-        .prepare("INSERT INTO users (name) VALUES ($1) RETURNING id")
-        .bind("Joe")
-        .get()
-        .await?;
-
-    println!("insert {:?}", user_id);
-
-    println!(" :: select");
-
-    // Iterate through each row, one-by-one
-    conn.prepare("SELECT id, name, password FROM users")
-        .select()
-        .try_for_each(|(id, name, password): (i64, String, Option<String>)| {
-            println!("select {} -> {} (password = {:?})", id, name, password);
-
-            future::ok(())
-        })
-        .await?;
-
-    // Get a map of id -> name of users with a name of JOE
-    let map: HashMap<i64, String> = conn
-        .prepare("SELECT id, name FROM users WHERE name = $1")
-        .bind("Joe")
-        .select()
-        .try_collect()
-        .await?;
-
-    println!(" :: users\n{:#?}\n", map);
-
-    conn.close().await?;
-
-    Ok(())
-}

examples/todo/Cargo.toml

@@ -0,0 +1,13 @@
+[package]
+name = "todo"
+version = "0.1.0"
+edition = "2018"
+
+[dependencies]
+sqlx = { path = "../.." }
+failure = "0.1.5"
+env_logger = "0.6.2"
+runtime = { version = "=0.3.0-alpha.6", default-features = false }
+runtime-tokio = { version = "=0.3.0-alpha.5" }
+futures-preview = "=0.3.0-alpha.17"
+structopt = "0.2.18"

examples/todo/src/main.rs

@@ -0,0 +1,131 @@
+#![feature(async_await)]
+
+use failure::Fallible;
+use futures::{future, TryStreamExt};
+use sqlx::postgres::Connection;
+use structopt::StructOpt;
+
+#[derive(StructOpt, Debug)]
+struct Options {
+    #[structopt(subcommand)]
+    cmd: Option<Command>
+}
+
+#[derive(StructOpt, Debug)]
+enum Command {
+    #[structopt(name = "add")]
+    Add {
+        text: String,
+    },
+
+    #[structopt(name = "done")]
+    MarkAsDone { id: i64 }
+}
+
+#[runtime::main(runtime_tokio::Tokio)]
+async fn main() -> Fallible<()> {
+    env_logger::try_init()?;
+
+    let opt = Options::from_args();
+
+    let mut conn = Connection::establish(
+        sqlx::ConnectOptions::new()
+            .host("127.0.0.1")
+            .port(5432)
+            .user("postgres")
+            .database("sqlx__dev__tasks"),
+    )
+    .await?;
+
+    ensure_schema(&mut conn).await?;
+
+    match opt.cmd {
+        Some(Command::Add { text }) => {
+            add_task(&mut conn, &text).await?;
+        }
+
+        Some(Command::MarkAsDone { id }) => {
+            mark_task_as_done(&mut conn, id).await?;
+        }
+
+        None => {
+            print_all_tasks(&mut conn).await?;
+        }
+    }
+
+    Ok(())
+}
+
+async fn ensure_schema(conn: &mut Connection) -> Fallible<()> {
+    conn.prepare("BEGIN").execute().await?;
+
+    // language=sql
+    conn.prepare(
+        r#"
+CREATE TABLE IF NOT EXISTS tasks (
+    id BIGSERIAL PRIMARY KEY,
+    text TEXT NOT NULL,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
+    done_at TIMESTAMPTZ
+)
+        "#,
+    )
+    .execute()
+    .await?;
+
+    conn.prepare("COMMIT").execute().await?;
+
+    Ok(())
+}
+
+async fn print_all_tasks(conn: &mut Connection) -> Fallible<()> {
+    // language=sql
+    conn.prepare(
+        r#"
+SELECT id, text
+FROM tasks
+WHERE done_at IS NULL
+        "#,
+    )
+    .select()
+    .try_for_each(|(id, text): (i64, String)| {
+        // language=text
+        println!("{:>5} | {}", id, text);
+
+        future::ok(())
+    })
+    .await?;
+
+    Ok(())
+}
+
+async fn add_task(conn: &mut Connection, text: &str) -> Fallible<()> {
+    // language=sql
+    conn.prepare(
+        r#"
+INSERT INTO tasks ( text )
+VALUES ( $1 )
+        "#,
+    )
+        .bind(text)
+        .execute()
+        .await?;
+
+    Ok(())
+}
+
+async fn mark_task_as_done(conn: &mut Connection, id: i64) -> Fallible<()> {
+    // language=sql
+    conn.prepare(
+        r#"
+UPDATE tasks
+SET done_at = now()
+WHERE id = $1
+        "#,
+    )
+        .bind(id)
+        .execute()
+        .await?;
+
+    Ok(())
+}