feat(query): Debug Query as SQL string.

Allow to print the current SQL query,
whether it's bound or not.

Useful for logging and diagnostics.

Author: pravic

src/query.rs

@@ -1,5 +1,6 @@
 use hyper::{header::CONTENT_LENGTH, Method, Request};
 use serde::Deserialize;
+use std::fmt;
 use url::Url;
 
 use crate::headers::with_request_headers;
@@ -22,6 +23,12 @@ pub struct Query {
     sql: SqlBuilder,
 }
 
+impl fmt::Debug for Query {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "{sql}", sql = self.sql)
+    }
+}
+
 impl Query {
     pub(crate) fn new(client: &Client, template: &str) -> Self {
         Self {

tests/it/query.rs

@@ -214,3 +214,14 @@ async fn overrides_client_options() {
     // should override the client options
     assert_eq!(value, override_value);
 }
+
+#[tokio::test]
+async fn prints_query() {
+    let client = prepare_database!();
+
+    let q = client.query("SELECT ?fields FROM test WHERE a = ? AND b < ?");
+    assert_eq!(
+        format!("{q:?}"),
+        "SELECT ?fields FROM test WHERE a = ? AND b < ?"
+    );
+}