module Sequel::Plugins::PreparedStatementsAssociations::InstanceMethods
Private Instance Methods
Use a prepared statement if possible to load the associated object, unless a dynamic callback is given.
# File lib/sequel/plugins/prepared_statements_associations.rb, line 87 def _load_associated_object(opts, dynamic_opts) if !dynamic_opts[:callback] && (bv = association_bound_variables(opts)) && (ps ||= association_prepared_statement(opts, bv)) ps.call(bv) else super end end
Use a prepared statement if possible to load the associated objects, unless a dynamic callback is given.
# File lib/sequel/plugins/prepared_statements_associations.rb, line 107 def _load_associated_object_array(opts, dynamic_opts) if !dynamic_opts[:callback] && (bv = association_bound_variables(opts)) && (ps ||= association_prepared_statement(opts, bv)) ps.call(bv) else super end end
Use a prepared statement if possible to load the associated object, unless the associated model uses caching.
# File lib/sequel/plugins/prepared_statements_associations.rb, line 97 def _load_associated_object_via_primary_key(opts) if !opts.associated_class.respond_to?(:cache_get_pk) && (bv = association_bound_variables(opts)) && (ps ||= association_prepared_statement(opts, bv)) ps.call(bv) else super end end
Return a bound variable hash that maps the keys in ks
(qualified by the table
) to the values of the results of
sending the methods in vs
.
# File lib/sequel/plugins/prepared_statements_associations.rb, line 30 def association_bound_variable_hash(table, ks, vs) Hash[*ks.zip(vs).map{|k, v| [:"#{table}.#{k}", get_column_value(v)]}.flatten] end
Given an association reflection, return a bound variable hash for the given association for this instance's values.
# File lib/sequel/plugins/prepared_statements_associations.rb, line 36 def association_bound_variables(opts) case opts[:type] when :many_to_one association_bound_variable_hash(opts.associated_class.table_name, opts.primary_keys, opts[:keys]) when :one_to_many, :one_to_one association_bound_variable_hash(opts.associated_class.table_name, opts[:keys], opts[:primary_keys]) when :many_to_many, :one_through_one association_bound_variable_hash(opts.join_table_alias, opts[:left_keys], opts[:left_primary_keys]) when :many_through_many, :one_through_many association_bound_variable_hash(opts.final_reverse_edge[:alias], Array(opts[:left_key]), opts[:left_primary_keys]) end end
Given an association reflection, return and cache a prepared statement for this association such that, given appropriate bound variables, the prepared statement will work correctly for any instance. Return false if such a prepared statement cannot be created.
# File lib/sequel/plugins/prepared_statements_associations.rb, line 52 def association_prepared_statement(opts, assoc_bv) return unless model.cache_associations opts.send(:cached_fetch, :prepared_statement) do unless opts[:instance_specific] ds, bv = _associated_dataset(opts, {}).unbind f = ds.opts[:from] if f && f.length == 1 s = ds.opts[:select] if ds.opts[:join] if opts.eager_loading_use_associated_key? && s && s.length == 1 && s.first.is_a?(SQL::ColumnAll) table = s.first.table ds = ds.select(*opts.associated_class.columns.map{|c| Sequel.identifier(c).qualify(table)}) end elsif !s || s.empty? ds = ds.select(*opts.associated_class.columns.map{|c| Sequel.identifier(c)}) end end if bv.length != assoc_bv.length h = {} bv.each do |k,v| h[k] = v unless assoc_bv.has_key?(k) end ds = ds.bind(h) end ps = ds.prepare(opts.returns_array? ? :select : :first, :"smpsap_#{NEXT.call}") ps.log_sql = true ps end end end