# Example usage

Set a string value:
  MysqlKv::write('hello', 'world')
  MysqlKv::read('hello')

Set an integer:
  MysqlKv::write('int', 123)
  MysqlKv::read('int')

Set a boolean:
  MysqlKv::write('bool', true)
  MysqlKv::read('bool')

Fetch a value, and set it if not already set:
  MysqlKv::fetch('fetchable') {
    'value'
  }

Set an expiring value:
  MysqlKv::write('expiring', 123, :expires_in => 1.second)

Old keys will automatically be expired when retrieved from the database.
If you would like to expire them without retrieving them, try:
  MysqlKv::expire

Increment a key:
  MysqlKv::incr('my_incr', 2) # => 2
  MysqlKv::incr('my_incr', 1) # => 3
Note that if the value is not currently an integer, it will be destroyed
and then created as an int.
  MysqlKv::write('my_incr', 'string') # => string
  MysqlKv::incr('my_incr', 1) # => 1

Delete a key:
  MysqlKv::write('deleteable', 'value')
  MysqlKv::delete('deleteable')

Delete keys by prefix:
  [*1..9].each { |prefix| MysqlKv::write("prefix_#{prefix}", true) }
  MysqlKv::delete_starts_with('prefix_')