basic.rs (3-89)
- use statements @3
- User @8 [pub] # User account with basic information.
   #[derive(Debug, Clone)]
   pub struct User {
       …
- DatabaseManager @15 [pub] # Database connection manager.
   pub struct DatabaseManager {
       …
- DatabaseManager @20
  - new (connection_string: String) -> Self @22 [pub] # Create a new database manager.
     pub fn new(connection_string: String) -> Self {
         Self {
       …
  - connect (&mut self) -> Result<(), String> @30 [pub] # Connect to the database.
     pub fn connect(&mut self) -> Result<(), String> {
         println!("Connecting to {}", self.connection_string);
         Ok(())
  - query (&self, sql: &str) -> Vec<String> @36 [pub] # Execute a SQL query.
     pub fn query(&self, sql: &str) -> Vec<String> {
         vec![]
- UserService @42 [pub] # Service for user operations.
   pub struct UserService {
       …
- UserService @46
  - create_user (&self, name: String, email: String) -> Result<u64, String> @48 [pub] # Create a user.
     pub fn create_user(&self, name: String, email: String) -> Result<u64, String> {
         Ok(1)
  - get_user (&self, user_id: u64) -> Option<User> @53 [pub] # Get user by ID.
     pub fn get_user(&self, user_id: u64) -> Option<User> {
         …
  - delete_user (&self, user_id: u64) -> bool @58 [pub] # Delete a user.
     pub fn delete_user(&self, user_id: u64) -> bool {
         …
- Validate @64 [pub] # Trait for objects that can be validated.
   pub trait Validate {
       …
       fn validate(&self) -> Result<(), String>;
- Validate for User @69
  - validate (&self) -> Result<(), String> @70
     fn validate(&self) -> Result<(), String> {
         if self.email.contains('@') {
       …
         } else {
       …
- validate_email (email: &str) -> bool @80 [pub] # Validate an email address.
   pub fn validate_email(email: &str) -> bool {
       email.contains('@')
- main () @85 # Entry point for the application.
   fn main() {
       let mut db = DatabaseManager::new("postgresql://localhost/mydb".to_string());
       db.connect().unwrap();
       println!("Application started");
