It's not just the SQL. There's also the mapping code between your objects and the SQL. for instance, for a select query: select first_name, last_name, logi

It's not just the SQL. There's also the mapping code between your objects and the SQL. for instance, for a select query: select first_name, last_name, login, email from users where id = 5; Depending on the language and ORM you use, you'll need to write code that resembles this: result = execute(query); User u = new User(); u.firstName = result.get("first_name); u.lastName = result.get("last_name); u.login = result.get("login); u.email = result.get("email); The mapping part may also involve data conversion between SQL types and you language types. The same also applies to the other direction: when you want to generate an SQL query that updates/inserts an object of yours into the database. ORMs also handle (I didn't say well) relations between objects (1..1, 1..n, n..n).