fix(examples): compilation errors, warnings in preferred-crates

Author: abonander

examples/postgres/preferred-crates/src/main.rs

@@ -34,7 +34,7 @@ async fn main() -> anyhow::Result<()> {
     uses_rust_decimal::create_table(&mut conn).await?;
     uses_time::create_table(&mut conn).await?;
 
-    let user_id = sqlx::query!(
+    let user_id = sqlx::query_scalar!(
         "insert into users(username, password_hash) values($1, $2) returning id",
         "user_foo",
         "<pretend this is a password hash>",
@@ -46,6 +46,8 @@ async fn main() -> anyhow::Result<()> {
         .fetch_one(&mut conn)
         .await?;
 
+    println!("Created user: {user:?}");
+
     let session =
         uses_time::create_session(&mut conn, SessionData { user_id }, SESSION_DURATION).await?;
 
@@ -62,5 +64,7 @@ async fn main() -> anyhow::Result<()> {
         .await?
         .expect("expected purchase");
 
+    println!("Created purchase: {purchase:?}");
+
     Ok(())
 }

examples/postgres/preferred-crates/uses-rust-decimal/src/lib.rs

@@ -1,8 +1,8 @@
 use chrono::{DateTime, Utc};
 use sqlx::PgExecutor;
 
-#[derive(sqlx::FromRow)]
-struct Purchase {
+#[derive(sqlx::FromRow, Debug)]
+pub struct Purchase {
     pub id: Uuid,
     pub user_id: Uuid,
     pub amount: Decimal,