module Sequel::Plugins::PgXminOptimisticLocking::InstanceMethods

Source

   # File lib/sequel/plugins/pg_xmin_optimistic_locking.rb
96 def _insert_dataset
97   super.returning(WILDCARD, :xmin)
98 end

Include xmin value when inserting initial row

Calls superclass method

_save_update_all_columns_hash ()

Source

    # File lib/sequel/plugins/pg_xmin_optimistic_locking.rb
102 def _save_update_all_columns_hash
103   v = super
104   v.delete(:xmin)
105   v
106 end

Remove the xmin from the columns to update. PostgreSQL automatically updates the xmin value, and it cannot be assigned.

Calls superclass method

_update_without_checking (columns)

Source

    # File lib/sequel/plugins/pg_xmin_optimistic_locking.rb
109 def _update_without_checking(columns)
110   ds = _update_dataset
111   rows = ds.clone(ds.send(:default_server_opts, :sql=>ds.returning(:xmin).update_sql(columns).freeze)).all
112   values[:xmin] = rows.first[:xmin] unless rows.empty?
113   rows.length
114 end

Add an RETURNING clause to fetch the updated xmin when updating the row.

lock_column_instance_filter ()

Source

   # File lib/sequel/plugins/pg_xmin_optimistic_locking.rb
91 def lock_column_instance_filter
92   super if @values[:xmin]
93 end

Only set the lock column instance filter if there is an xmin value.

Calls superclass method