client: print errors and warnings to stderr

src/client/commands.rs

@@ -202,7 +202,7 @@ pub async fn print_authorization_owner_hint(
         response => return erroneous_server_response(response),
     };
 
-    println!(
+    eprintln!(
         "Note: You are allowed to manage databases and users with the following prefixes:\n{}",
         response.into_iter().map(|p| format!(" - {}", p)).join("\n")
     );

src/client/commands/drop_db.rs

@@ -53,8 +53,11 @@ pub async fn drop_databases(
             ))
             .interact()?;
 
+        //
         if !confirmation {
+            // TODO: should we return with an error code here?
             println!("Aborting drop operation.");
+            server_connection.send(Request::Exit).await?;
             return Ok(());
         }
     }

src/client/commands/drop_user.rs

@@ -54,7 +54,9 @@ pub async fn drop_users(
             .interact()?;
 
         if !confirmation {
+            // TODO: should we return with an error code here?
             println!("Aborting drop operation.");
+            server_connection.send(Request::Exit).await?;
             return Ok(());
         }
     }

src/client/mysql_admutils_compatibility/mysql_useradm.rs

@@ -292,7 +292,7 @@ async fn show_users(
         Some(Ok(Response::ListAllUsers(result))) => match result {
             Ok(users) => users,
             Err(err) => {
-                println!("Failed to list users: {:?}", err);
+                eprintln!("Failed to list users: {:?}", err);
                 return Ok(());
             }
         },