Solution for Student Roster DB from Schema

Student_Roster_DB_from_Schema_solution.rb

# Solution for Challenge: Student Roster DB from Schema. Started 2013-07-09T19:29:26+00:00
require 'sqlite3'

# If you want to overwrite your database you will need 
# to delete it before running this file
$db = SQLite3::Database.new "students.db"

module StudentDB
  def self.setup
    $db.execute(
      <<-SQL
        CREATE TABLE students (
          id INTEGER PRIMARY KEY AUTOINCREMENT,
          first_name VARCHAR(64) NOT NULL,
          last_name VARCHAR(64) NOT NULL,
          gender VARCHAR(64) NOT NULL,
          birthday DATE NOT NULL,
          email VARCHAR(64) NOT NULL,
          phone VARCHAR(64) NOT NULL,
          created_at DATETIME NOT NULL,
          updated_at DATETIME NOT NULL
        );
      SQL
    )
  end

  def self.seed
    # Add a few records to your database when you start
    $db.execute(
      <<-SQL
        INSERT INTO students 
          (first_name, last_name, gender, birthday, email, phone, created_at, updated_at)
        VALUES
          ('Brick','Thornton', 'male', '1983-03-13', '[email protected]', '123-456-7890', DATETIME('now'), DATETIME('now'));

        -- Create two more students who are at least as cool as this one.
      SQL
      )
  end
end


class Students
  def initialize
     @created_at = Time.now
     @updated_at = Time.now
  end

  def add_student(first_name, last_name, gender, birthday, email, phone)
    $db.execute(
      <<-SQL 
        INSERT INTO students 
        (first_name, last_name, gender, birthday, email, phone, created_at, updated_at)
        VALUES
        ("#{first_name}", "#{last_name}", "#{gender}", "#{birthday}", "#{email}", "#{phone}", "#{@created_at}", "#{@updated_at}");
      SQL
      )
  end

  def delete_student(student_id)
    $db.execute(
      <<-SQL 
        DELETE FROM students WHERE id = "#{student_id}"
      SQL
      )
  end

  def list_students
    $db.execute(
      <<-SQL 
        SELECT * FROM students 
      SQL
      )
  end

  def first_name(first_name)
   $db.execute(
      <<-SQL 
        SELECT * FROM students WHERE first_name="#{first_name}"
      SQL
      )
  end

  def by_attribute(attribute, value)
    $db.execute(
      <<-SQL 
        SELECT * FROM students WHERE "#{attribute}"="#{value}"
      SQL
      )
  end

  def birthdays_this_month
    current_month = Time.now.month.to_s
    current_month.prepend('0') if current_month.length == 1
    p current_month
    $db.execute(
      <<-SQL 
        SELECT * FROM students WHERE birthday LIKE "%-#{current_month}-%"
      SQL
      )
  end

  def list_by_birthday
    $db.execute(
      <<-SQL 
        SELECT birthday, first_name, last_name FROM students
        GROUP BY birthday
        ORDER BY birthday
      SQL
      )
  end
end


student = Students.new
student.add_student("Jake", "Myers", "male", "1979-12-01", "[email protected]", "859-457-0990")
student.add_student("Anew", "Record", "male", "1979-07-01", "[email protected]", "555-777-0888")

student.delete_student(2)
p student.list_students
p student.first_name("Jake")
p student.by_attribute("last_name", "Myers")
p student.birthdays_this_month
p student.list_by_birthday