Created
May 7, 2013 18:50
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| require_relative "university" | |
| University.open_db | |
| student = University::Student.new('Tanner Welsh') | |
| student.save | |
| student = University::Student.new('Mike Busch') | |
| student.save | |
| University::Student.find_by_id(1) |
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| -- --- | |
| -- Table 'students' | |
| -- | |
| -- --- | |
| DROP TABLE IF EXISTS `students`; | |
| CREATE TABLE `students` ( | |
| `id` INTEGER PRIMARY KEY AUTOINCREMENT, | |
| `name` VARCHAR NULL DEFAULT NULL | |
| ); | |
| -- --- | |
| -- Table 'classes' | |
| -- | |
| -- --- | |
| DROP TABLE IF EXISTS `classes`; | |
| CREATE TABLE `classes` ( | |
| `id` INTEGER PRIMARY KEY AUTOINCREMENT, | |
| `title` VARCHAR NULL DEFAULT NULL, | |
| `department_id` INTEGER NULL DEFAULT NULL | |
| ); | |
| -- --- | |
| -- Table 'teachers' | |
| -- | |
| -- --- | |
| DROP TABLE IF EXISTS `teachers`; | |
| CREATE TABLE `teachers` ( | |
| `id` INTEGER PRIMARY KEY AUTOINCREMENT, | |
| `name` VARCHAR NULL DEFAULT NULL | |
| ); | |
| -- --- | |
| -- Table 'attendance' | |
| -- | |
| -- --- | |
| DROP TABLE IF EXISTS `attendance`; | |
| CREATE TABLE `attendance` ( | |
| `id` INTEGER PRIMARY KEY AUTOINCREMENT, | |
| `student_id` INTEGER NULL DEFAULT NULL, | |
| `section_id` INTEGER NULL DEFAULT NULL, | |
| `grade` CHAR(1) NULL DEFAULT NULL | |
| ); | |
| -- --- | |
| -- Table 'sections' | |
| -- | |
| -- --- | |
| DROP TABLE IF EXISTS `sections`; | |
| CREATE TABLE `sections` ( | |
| `id` INTEGER PRIMARY KEY AUTOINCREMENT, | |
| `start_time` INTEGER NULL DEFAULT NULL, | |
| `end_time` INTEGER NULL DEFAULT NULL, | |
| `days_of_week` VARCHAR(4) NULL DEFAULT NULL, | |
| `class_id` INTEGER NULL DEFAULT NULL, | |
| `teacher_id` INTEGER NULL DEFAULT NULL | |
| ); | |
| -- --- | |
| -- Table 'departments' | |
| -- | |
| -- --- | |
| DROP TABLE IF EXISTS `departments`; | |
| CREATE TABLE `departments` ( | |
| `id` INTEGER PRIMARY KEY AUTOINCREMENT, | |
| `title` VARCHAR NULL DEFAULT NULL | |
| ); |
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| require 'sqlite3' | |
| module University | |
| DB_FILE = 'university.db' | |
| SCHEMA = 'schema.sql' | |
| def self.open_db | |
| load_schema unless File.exists? DB_FILE | |
| $db = SQLite3::Database.new(DB_FILE) | |
| end | |
| def self.load_schema | |
| system "sqlite3 #{DB_FILE} < #{SCHEMA}" | |
| end | |
| class Student | |
| attr_reader :name | |
| attr_accessor :id | |
| def initialize(name) | |
| @name = name | |
| end | |
| def save | |
| $db.execute("INSERT INTO students (name) VALUES (?);", self.name) | |
| end | |
| def self.find_by_id(id) | |
| record = $db.execute("SELECT * FROM students WHERE id = ? LIMIT 1;", id).first | |
| id, name = record | |
| found_student = self.new(name) | |
| found_student.id = id | |
| found_student | |
| end | |
| end | |
| end |
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