This plugin implements optimistic locking mechanism on Microsoft SQL Server using a timestamp/rowversion column to ensure that concurrent updates are detected and previous changes are not automatically overridden. This is best implemented by a code example:

  class Person < Sequel::Model
    plugin :mssql_optimistic_locking
  end
  p1 = Person[1]
  p2 = Person[1]
  p1.update(name: 'Jim') # works
  p2.update(name: 'Bob') # raises Sequel::NoExistingObject

In order for this plugin to work, you need to make sure that the database table has a column of timestamp or rowversion. The plugin uses a default name of timestamp for this columns, but you can override that using the :lock_column option:

    plugin :mssql_optimistic_locking, lock_column: :column_name

This plugin relies on the instance_filters plugin.