chore: import upstream snapshot with attribution

testing/postgres-client-tests/rust/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "sqlx_exists_demo"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+tokio = { version = "1", features = ["macros", "rt-multi-thread"] }
+sqlx = { version = "0.8", features = ["runtime-tokio", "postgres", "tls-native-tls", "uuid", "chrono"] }

testing/postgres-client-tests/rust/src/main.rs

@@ -0,0 +1,75 @@
+use sqlx::postgres::PgPoolOptions;
+use sqlx::types::Uuid;
+use sqlx::types::chrono::Utc;
+use sqlx::types::chrono::DateTime;
+use sqlx::types::chrono::NaiveDate;
+
+#[derive(sqlx::FromRow)]
+struct Event {
+	id: sqlx::types::Uuid,
+	created_at: DateTime<Utc>,
+	event_date: Option<NaiveDate>,
+}
+
+#[tokio::main]
+async fn main() -> Result<(), Box<dyn std::error::Error>> {
+	let mut args = std::env::args();
+	let program = args.next().unwrap_or_else(|| "app".to_string());
+	let user = args.next().ok_or_else(|| {
+		format!("Usage: {program} <USER> <PORT>")
+	})?;
+	let port: u16 = args.next().ok_or_else(|| {
+		format!("Usage: {program} <USER> <PORT>")
+	})?.parse()?;
+	let database_url = format!("postgresql://{user}:password@localhost:{port}/postgres");
+	let pool = PgPoolOptions::new()
+		.max_connections(5)
+		.connect(&database_url)
+		.await?;
+ 
+	let exists: bool = sqlx::query_scalar("SELECT EXISTS(SELECT 1 FROM pg_catalog.pg_tables WHERE tablename = $1);")
+		.bind("test_table")
+		.fetch_one(&pool)
+		.await?;
+	println!("exists={exists}");
+
+	sqlx::query("DROP TABLE IF EXISTS users, events;")
+		.execute(&pool)
+		.await?;
+
+	sqlx::query("CREATE TABLE users (id uuid default gen_random_uuid(), name text, email text);")
+		.execute(&pool)
+		.await?;
+
+	sqlx::query("INSERT INTO users (name, email) VALUES ($1, $2)")
+		.bind("Alice")
+		.bind("alice@example.com")
+		.execute(&pool)
+		.await?;
+
+	let some_uuid: Uuid = sqlx::query_scalar("SELECT id FROM users WHERE email = $1 LIMIT 1")
+		.bind("alice@example.com")
+		.fetch_one(&pool)
+		.await?;
+
+	sqlx::query("UPDATE users SET name = $1 WHERE id = $2")
+		.bind("Bob")
+		.bind(some_uuid)
+		.execute(&pool)
+		.await?;
+
+	sqlx::query("CREATE TABLE events (id UUID PRIMARY KEY, created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(), event_date DATE);")
+		.execute(&pool)
+		.await?;
+
+	let some_id: Uuid = sqlx::query_scalar("INSERT INTO events (id, event_date) VALUES (gen_random_uuid(), '2026-02-12') RETURNING id;")
+		.fetch_one(&pool)
+		.await?;
+
+	let __event = sqlx::query_as::<_, Event>("SELECT * FROM events WHERE id = $1")
+		.bind(some_id)
+		.fetch_one(&pool)
+		.await?;
+
+	Ok(())
+}