create the config dir if it does not exist

examples/official-site/your-first-sql-website/index.sql

@@ -103,7 +103,8 @@ CREATE TABLE users ( id INTEGER PRIMARY KEY, name TEXT NOT NULL );
 Connect to a custom database
 ============================
 
-By default, SQLPage uses a [SQLite](https://www.sqlite.org/about.html) database stored in a file named `sqlpage.db` in your website''s root folder.
+By default, SQLPage uses a [SQLite](https://www.sqlite.org/about.html) database stored in a file named `sqlpage.db`
+in the `sqlpage` configuration folder.
 You can change this by creating a file named `sqlpage.json` in a folder called `sqlpage`.
 So, if your website''s root folder is `/mysite`, you should create a file at `/mysite/sqlpage/sqlpage.json`.
 

sqlpage/sqlpage.json

@@ -1,4 +1,4 @@
 {
-  "database_url": "sqlite://./sqlpage.db?mode=rwc",
+  "database_url": "sqlite://./sqlpage/sqlpage.db?mode=rwc",
   "listen_on": "localhost:8080"
 }

src/app_config.rs

@@ -100,11 +100,15 @@ fn default_database_url() -> String {
         } else if let Ok(true) = default_db_path.try_exists() {
             log::debug!("Using the default datbase file in {default_db_path:?}.");
             return prefix + default_db_path.to_str().unwrap();
-        } else if let Ok(tmp_file) = std::fs::File::create(&default_db_path) {
-            log::info!("No DATABASE_URL provided, {default_db_path:?} is writable, creating a new database file.");
-            drop(tmp_file);
-            std::fs::remove_file(&default_db_path).expect("removing temp file");
-            return prefix + default_db_path.to_str().unwrap() + "?mode=rwc";
+        } else {
+            // Create the default database file if we can
+            let _ = std::fs::create_dir_all(&default_db_path.parent().unwrap()); // may already exist
+            if let Ok(tmp_file) = std::fs::File::create(&default_db_path) {
+                log::info!("No DATABASE_URL provided, {default_db_path:?} is writable, creating a new database file.");
+                drop(tmp_file);
+                std::fs::remove_file(&default_db_path).expect("removing temp file");
+                return prefix + default_db_path.to_str().unwrap() + "?mode=rwc";
+            }
         }
     }