Check out example codes for "how to define a save method in ruby for sqlite3 databases". It will help you in understanding the concepts better.

Code Example 1

def save
    sql = <<-SQL
      INSERT INTO songs (name, album) 
      VALUES (?, ?)
    SQL
 
    DB[:conn].execute(sql, self.name, self.album)
 
    @id = DB[:conn].execute("SELECT last_insert_rowid() FROM songs")[0][0]
 
  end

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