Class: Spider::Model::Mappers::DbMapper
- Inherits:
-
Spider::Model::Mapper
- Object
- Spider::Model::Mapper
- Spider::Model::Mappers::DbMapper
- Includes:
- Storage::Db
- Defined in:
- lib/spiderfw/model/mappers/db_mapper.rb
Instance Attribute Summary
Attributes inherited from Spider::Model::Mapper
Class Method Summary collapse
-
.write? ⇒ Boolean
:nodoc:.
Instance Method Summary collapse
-
#alter_table(name, schema, attributes, force = nil) ⇒ Object
Returns an alter table structure description.
-
#assign_primary_keys(obj) ⇒ Object
Empty hook to set primary keys in the model before insert.
- #base_type(type) ⇒ Object
-
#before_save(obj, mode) ⇒ Object
Save (insert and update) #.
-
#bulk_update(values, condition) ⇒ Object
Updates according to a condition, storing the values, which must passed as a Hash.
-
#can_join?(element) ⇒ Boolean
Returns true if an element can be loaded joined-in.
-
#collect_real_keys(element, path = []) ⇒ Object
Returns an array of all keys, “dereferencing” model keys.
- #compute_foreign_key_constraints ⇒ Object
-
#count(condition_or_query) ⇒ Object
Implements the Mapper#count method doing a count SQL query.
-
#create_table(table_name, schema, attributes) ⇒ Object
Returns a create table structure description.
-
#define_schema(&proc) ⇒ Object
Define schema.
-
#do_delete(condition, force = false) ⇒ Object
:nodoc:.
-
#do_insert(obj) ⇒ Object
:nodoc:.
-
#do_update(obj) ⇒ Object
:nodoc:.
- #execute_action(action, object, params = {}) ⇒ Object
-
#fetch(query) ⇒ Object
Implements the Mapper#fetch method.
-
#find_by_sql(sql, *bind_vars) ⇒ Object
Finds objects by SQL, mapping back the storage result.
-
#generate_schema(schema = nil) ⇒ Object
Autogenerates schema.
-
#get_deep_join(dotted_element) ⇒ Object
Returns the joins needed for an element down the tree, expressed in dotted notation.
-
#get_dependencies(task) ⇒ Object
UnitOfWork dependencies.
-
#get_join(element, join_type = :inner) ⇒ Object
Figures out a join for element.
- #get_join_info(model, condition) ⇒ Object
-
#get_schema ⇒ Object
Returns the schema, as defined or autogenerated.
-
#have_references?(element) ⇒ Boolean
Checks if the schema has some key to reach element.
-
#initialize(model, storage) ⇒ DbMapper
constructor
A new instance of DbMapper.
-
#lock(obj = nil, mode = :exclusive) ⇒ Object
Lock db – FIXME.
-
#map(request, result, obj_or_model) ⇒ Object
Implements the Mapper#map method.
- #map_back_value(type, value) ⇒ Object
-
#map_type(type) ⇒ Object
Returns a type accepted by the storage for type.
-
#map_value(type, value, mode = nil) ⇒ Object
Converts a value in one accepted by the storage.
-
#max(element, condition = nil) ⇒ Object
Aggregates #.
- #pk ⇒ Object
-
#prepare_condition(condition, options = {}) ⇒ Object
Generates a storage description for the condition Returns a list of three elements, composed of * conditions: an hash { :conj => ‘and’|‘or’, :values => an array of [field, comparison, value] triplets } * joins: an array of structures as returned by #get_join * remaining_condition: part of the condition which can’t be passed to the storage – TODO: better name for :values.
-
#prepare_expression(expr) ⇒ Object
Takes a Spider::QueryFuncs::Expression, and associates the fields to the corresponding elements Returns an array of needed joins.
-
#prepare_insert(obj) ⇒ Object
Insert preprocessing.
-
#prepare_joins(joins) ⇒ Object
– FIXME: document.
-
#prepare_order(query) ⇒ Object
Returns a pair composed of * fields, an array of [field, direction] couples; and * joins, joins needed for the order, if any.
-
#prepare_query_request(request, obj = nil) ⇒ Object
:nodoc:.
- #prepare_queryfunc(func) ⇒ Object
-
#prepare_save(obj, save_mode) ⇒ Object
Save preprocessing.
-
#prepare_select(query) ⇒ Object
Generates a select hash description based on the query.
-
#prepare_update(obj) ⇒ Object
Update preprocessing.
-
#schema ⇒ Object
Returns @schema, or creates one.
-
#sequence_next(name) ⇒ Object
Next value for the named sequence.
- #someone_have_references?(element) ⇒ Boolean
-
#sql_execute(sql, *values) ⇒ Object
Execute SQL directly, returning raw db results.
- #storage_column_attributes(type, attributes) ⇒ Object
- #storage_column_type(type, attributes) ⇒ Object
-
#sync_schema(force = false, options = {}) ⇒ Object
Modifies the storage according to the schema.
- #truncate! ⇒ Object
-
#with_schema(&proc) ⇒ Object
Extend schema.
Methods inherited from Spider::Model::Mapper
#after_delete, #after_save, #associate_external, #association_elements, #basic_preprocess, #before_delete, #before_insert, #before_update, #children_for_unit_of_work, #delete, #delete_all!, #delete_element_associations, #determine_save_mode, #expand_request, #find, #find_with_superclass, #get_external, #get_external_element, #insert, #load, #load_element, #load_element!, #map_condition_value, #map_elements, #map_save_value, #mapped?, #merge_object, #no_map, #normalize, #prepare_delete_condition, #prepare_query, #preprocess_condition, #queryset_siblings, #save, #save_all, #save_associations, #save_done, #save_element_associations, #save_extended_models, #save_integrated, #set_pks_condition, #sortable?, #split_condition_polymorphs, #storage_value_to_mapper, #update
Constructor Details
#initialize(model, storage) ⇒ DbMapper
Returns a new instance of DbMapper.
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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 10 def initialize(model, storage) super @type = :db end |
Class Method Details
.write? ⇒ Boolean
:nodoc:
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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 15 def self.write? #:nodoc: true end |
Instance Method Details
#alter_table(name, schema, attributes, force = nil) ⇒ Object
Returns an alter table structure description
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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 1184 def alter_table(name, schema, attributes, force=nil) # :nodoc: current = @storage.describe_table(name) current_fields = current[:columns] add_fields = [] alter_fields = [] all_fields = [] unsafe = [] fields = schema[:columns] schema[:fields_order].each do |f| field = f.name field_hash = { :name => field, :type => fields[field][:type], :attributes => fields[field][:attributes] } all_fields << field_hash if (!current_fields[field]) add_fields << field_hash else type = fields[field][:type] field_attributes = fields[field][:attributes] field_attributes ||= {} if (!@storage.schema_field_equal?(current_fields[field], fields[field])) # Spider.logger.debug("DIFFERENT: #{field}") # Spider.logger.debug(current_fields[field]) # Spider.logger.debug(fields[field]) unless @storage.safe_schema_conversion?(current_fields[field], fields[field]) || force unsafe << field next end alter_fields << field_hash end end end alter_attributes = {} if (current[:primary_keys] != attributes[:primary_keys]) alter_attributes[:primary_keys] = attributes[:primary_keys] end if (attributes[:foreign_key_constraints]) end alter_attributes[:foreign_key_constraints] = attributes[:foreign_key_constraints] @storage.alter_table({ :table => name, :add_fields => add_fields, :alter_fields => alter_fields, :all_fields => all_fields, :attributes => alter_attributes, :current => current }) raise SchemaSyncUnsafeConversion.new(unsafe) unless unsafe.empty? end |
#assign_primary_keys(obj) ⇒ Object
Empty hook to set primary keys in the model before insert. Override if needed.
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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 845 def assign_primary_keys(obj) # may be implemented in model through the 'with_mapper' method end |
#base_type(type) ⇒ Object
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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 984 def base_type(type) if type <= Spider::DataTypes::PK Fixnum else super end end |
#before_save(obj, mode) ⇒ Object
Save (insert and update) #
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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 41 def before_save(obj, mode) #:nodoc: super end |
#bulk_update(values, condition) ⇒ Object
Updates according to a condition, storing the values, which must passed as a Hash.
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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 155 def bulk_update(values, condition) db_values = {} joins = [] integrated = {} condition = preprocess_condition(condition) values.each do |key, val| element = @model.elements[key] if (element.integrated?) integrated[element.integrated_from] ||= {} integrated[element.integrated_from][key] = val next end next if !mapped?(element) next if element.model? && val != nil store_key = schema.field(element.name) next unless store_key if (val.is_a?(Spider::QueryFuncs::Expression)) joins += prepare_expression(val) db_values[store_key] = val else db_values[store_key] = map_save_value(element.type, val, :update) end end integrated.each do |i_el, i_values| next unless condition[i_el.name] i_el.mapper.bulk_update(i_values, condition[i_el.name]) # FIXME? end return if db_values.empty? save = {:table => schema.table, :values => db_values} condition, c_joins = prepare_condition(condition) joins += c_joins save[:condition] = condition save[:joins] = prepare_joins(joins) sql, bind_vars = @storage.sql_update(save) return @storage.execute(sql, *bind_vars) end |
#can_join?(element) ⇒ Boolean
Returns true if an element can be loaded joined-in.
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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 310 def can_join?(element) return false if element.storage != @storage return true end |
#collect_real_keys(element, path = []) ⇒ Object
Returns an array of all keys, “dereferencing” model keys.
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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 1099 def collect_real_keys(element, path=[]) # :nodoc: real_keys = [] element.type.primary_keys.each do |key| if (key.model?) real_keys += schema_collect_real_keys(key, path<<element.name) else real_keys << [key, path<<element.name] end end return real_keys end |
#compute_foreign_key_constraints ⇒ Object
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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 1074 def compute_foreign_key_constraints @model.each_element do |element| foreign_key_constraints = {} next if element.integrated? next unless mapped?(element) next if element.attributes[:added_reverse] && element.has_single_reverse? next unless element.model? next if element.multiple? next unless element.type.mapper.storage == @storage element.type.primary_keys.each do |key| column = self.schema.foreign_key_field(element.name, key.name) column_name = column.name next if !key.integrated? && !element.type.mapper.schema.column(key.name) # FIXME foreign_key_constraints[column_name] = key.integrated? ? \ element.type.mapper.schema.foreign_key_field(key.integrated_from.name, key.integrated_from_element).name : \ element.type.mapper.schema.column(key.name).name end unless foreign_key_constraints.empty? name = element.attributes[:db_foreign_key_name] || "FK_#{schema.table.name}_#{element.name}" self.schema.set_foreign_key_constraint(name, element.type.mapper.schema.table.name, foreign_key_constraints) end end end |
#count(condition_or_query) ⇒ Object
Implements the Mapper#count method doing a count SQL query.
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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 209 def count(condition_or_query) if (condition_or_query.is_a?(Query)) q = condition_or_query.clone else q = Query.new(condition_or_query, @model.primary_keys) end prepare_query(q) storage_query = prepare_select(q) storage_query[:query_type] = :count storage_query.delete(:order) storage_query.delete(:limit) return @storage.query(storage_query) end |
#create_table(table_name, schema, attributes) ⇒ Object
Returns a create table structure description.
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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 1167 def create_table(table_name, schema, attributes) # :nodoc: fields = schema[:fields_order].uniq.map do |f| details = schema[:columns][f.name] { :name => f.name, :type => details[:type], :attributes => details[:attributes] } end @storage.create_table({ :table => table_name, :fields => fields, :attributes => attributes }) end |
#define_schema(&proc) ⇒ Object
Define schema. Given block will be instance_eval’d before schema auto generation. See also #with_schema.
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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 947 def define_schema(&proc) @schema_define_procs ||= [] @schema_define_procs << proc end |
#do_delete(condition, force = false) ⇒ Object
:nodoc:
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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 63 def do_delete(condition, force=false) #:nodoc: #delete = prepare_delete(obj) del = {} del[:condition], del[:joins] = prepare_condition(condition) del[:table] = schema.table sql, values = storage.sql_delete(del, force) storage.execute(sql, *values) end |
#do_insert(obj) ⇒ Object
:nodoc:
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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 46 def do_insert(obj) #:nodoc: if (obj.model.managed? || !obj.primary_keys_set?) assign_primary_keys(obj) end sql, values = prepare_insert(obj) if (sql) @storage.execute(sql, *values) end end |
#do_update(obj) ⇒ Object
:nodoc:
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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 56 def do_update(obj) #:nodoc: sql, values = prepare_update(obj) if (sql) storage.execute(sql, *values) end end |
#execute_action(action, object, params = {}) ⇒ Object
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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 927 def execute_action(action, object, params={}) return super unless action == :delete_associations el = object.class.elements[params[:element]] delete_element_associations(object, el) end |
#fetch(query) ⇒ Object
Implements the Mapper#fetch method.
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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 224 def fetch(query) # Spider.logger.debug("Fetching model #{@model} query:") # Spider.logger.debug(query) storage_query = prepare_select(query) if (storage_query) result = @storage.query(storage_query) result.total_rows = @storage.total_rows if (query.request.total_rows) end return result end |
#find_by_sql(sql, *bind_vars) ⇒ Object
Finds objects by SQL, mapping back the storage result.
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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 236 def find_by_sql(sql, *bind_vars) result = storage.execute(sql, *bind_vars) set = QuerySet.new(@model) result.each do |row| set << map(nil, row, @model) end set.modified = false return set end |
#generate_schema(schema = nil) ⇒ Object
Autogenerates schema. Returns a DbSchema.
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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 993 def generate_schema(schema=nil) had_schema = schema ? true : false schema ||= DbSchema.new n = @model.name.sub('::Models', '') n.sub!(@model.app.name, @model.app.short_prefix) if @model.app.short_prefix schema.table ||= @model.attributes[:db_table] || @storage.table_name(n) integrated_pks = [] @model.each_element do |element| if element.integrated? integrated_pks << [element.integrated_from.name, element.integrated_from_element] if (element.primary_key?) end end @model.each_element do |element| next if element.integrated? next unless mapped?(element) next if had_schema && schema.pass[element.name] next if element.attributes[:added_reverse] && element.has_single_reverse? if (!element.model?) column = schema.columns[element.name] storage_type = base_type(element.type) db_attributes = column.attributes if column if (!db_attributes || db_attributes.empty?) db_attributes = storage_column_attributes(storage_type, element.attributes) db_attributes.merge(element.attributes[:db]) if (element.attributes[:db]) if (element.attributes[:autoincrement] && !db_attributes[:autoincrement]) schema.set_sequence(element.name, @storage.sequence_name("#{schema.table}_#{element.name}")) end end column_type = element.attributes[:db_column_type] || storage_column_type(storage_type, element.attributes) unless column column_name = element.attributes[:db_column_name] || @storage.column_name(element.name) column = Field.new(schema.table, column_name, column_type) end column.type ||= column_type column.attributes = db_attributes column.primary_key = true if element.primary_key? schema.set_column(element.name, column) elsif (true) # FIXME: must have condition element.storage == @storage in some of the subcases if (!element.multiple? && !element.attributes[:junction] && !element.attributes[:condition]) # 1/n <-> 1 current_schema = schema.foreign_keys[element.name] || {} foreign_key_constraints = {} el_mapper = element.type.mapper element.type.primary_keys.each do |key| if key.model? # fixme: only works with single primary key model (after the first) curr_key = key curr_key = curr_key.model.primary_keys[0] while curr_key.model? && curr_key.model.primary_keys.length == 1 next if curr_key.model key_type = curr_key.type key_attributes = curr_key.attributes else key_type = key.type key_attributes = key.attributes end #key_column = element.mapper.schema.column(key.name) key_attributes = { :length => key_attributes[:length], :precision => key_attributes[:precision] } column = current_schema[key.name] key_storage_type = el_mapper.base_type(key_type) column_type = element.attributes[:db_column_type] || storage_column_type(key_storage_type, key_attributes) unless column column_name = element.attributes[:db_column_name] || @storage.column_name("#{element.name}_#{key.name}") column_attributes = @storage.column_attributes(key_type, key_attributes) column = Field.new(schema.table, column_name, column_type, column_attributes) end column.type ||= column_type column.primary_key = true if (element.primary_key? || integrated_pks.include?([element.name, key.name])) schema.set_foreign_key(element.name, key.name, column) end end end end @model.sequences.each do |name| schema.set_sequence(name, @storage.sequence_name("#{schema.table}_#{name}")) end return schema end |
#get_deep_join(dotted_element) ⇒ Object
Returns the joins needed for an element down the tree, expressed in dotted notation. Returns a triplet composed of
-
joins
-
final model called
-
final element called
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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 714 def get_deep_join(dotted_element) #return [[], @model, @model.elements[dotted_element]] unless dotted_element.is_a?(String) parts = dotted_element.to_s.split('.').map{ |el| el.to_sym } current_model = @model joins = [] el = nil # Spider::Logger.debug("GETTING DEEP JOIN TO #{dotted_element} (#{@model})") parts.each do |part| el = current_model.elements[part] raise "Can't find element #{part} in model #{current_model}" unless el if (el.integrated?) joins << current_model.mapper.get_join(el.integrated_from) current_model = el.integrated_from.type el = current_model.elements[el.integrated_from_element] end if (el.model? && can_join?(el)) joins << current_model.mapper.get_join(el) current_model = el.model end end while (el.integrated?) joins << current_model.mapper.get_join(el.integrated_from) # joins << current_model.integrated_from.mapper.get_join(el.integrated_from_element) current_model = el.integrated_from.type el = current_model.elements[el.integrated_from_element] end return [joins, current_model, el] end |
#get_dependencies(task) ⇒ Object
UnitOfWork dependencies.
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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 855 def get_dependencies(task) deps = [] obj = task.object action = task.action deps = [] case action when :keys deps << [task, MapperTask.new(obj, :save)] unless obj.primary_keys_set? || (!obj.mapper || !obj.mapper.class.write?) when :save @model.primary_keys.each do |key| if key.integrated? && !obj.element_has_value?(key) obj.get(key.integrated_from) # ensure super object is instantiated, so it gets processed later end end elements = @model.elements.select{ |n, el| !el.integrated? && el.model? && obj.element_has_value?(el) && obj.element_modified?(el)} elements.each do |name, element| if have_references?(element) el_obj = obj.send(element.name) sub_task = MapperTask.new(el_obj, :keys) deps << [task, sub_task] else if element.type.mapper && element.type.mapper.class.write? el_val = obj.send(element.name) if element.multiple? set = el_val if element.junction? && !element.attributes[:keep_junction] set = obj.send("#{element.name}_junction") end delete_ass = nil if set.modified # queryset modified delete_ass = MapperTask.new(obj, :delete_associations, :element => element.name) deps << [task, delete_ass] end prev_task = nil set.each do |set_obj| sub_task = MapperTask.new(set_obj, :save) if set_obj.class.attributes[:sub_model] && delete_ass set_obj.class.primary_keys.each{ |pk| set_obj.set(pk, nil) } end if prev_task deps << [sub_task, prev_task] else deps << [sub_task, task] end if delete_ass del_dep = set_obj if element.reverse set_obj.set_modified(element.reverse) el = set_obj.class.elements[element.reverse] # ensure the real owner is added as a dependency while el.integrated? del_dep = set_obj.get(el.integrated_from) el = del_dep.class.elements[el.integrated_from_element] end end deps << [MapperTask.new(del_dep, :save), delete_ass] end prev_task = sub_task end else el_val.set_modified(element.reverse) deps << [task, MapperTask.new(el_val, :save)] end end end end end return deps end |
#get_join(element, join_type = :inner) ⇒ Object
Figures out a join for element. Returns join hash description, i.e. :
join = {
:type => :inner|:outer|...,
:from => 'table1',
:to => 'table2',
:keys => hash of key pairs,
:condition => join condition
}
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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 643 def get_join(element, join_type = :inner) return unless element.model? #Spider::Logger.debug("Getting join for model #{@model} to element #{element}") #Spider::Logger.debug(@model.primary_keys.map{|k| k.name}) element_table = element.mapper.schema.table if (schema.has_foreign_fields?(element.name)) #Spider::Logger.debug("JOIN A from #{@model} to #{element.name}") keys = {} element.model.primary_keys.each do |key| if (key.integrated?) # FIXME raise "Unimplemented join dereference for multiple primary keys" if key.integrated_from.model.primary_keys.length > 1 el_field = element.mapper.schema.foreign_key_field(key.integrated_from.name, key.integrated_from.model.primary_keys[0].name) else el_field = element.mapper.schema.field(key.name) end fk = schema.foreign_key_field(element.name, key.name) keys[fk] = el_field # FIXME: works with models as primary keys through a hack in the field method of db_schema, # assuming the model has only one key. the correct way would be to get another join end if (element.condition) condition, condition_joins, condition_remaining = element.mapper.prepare_condition(element.condition) end as = nil if (element.model == @model) as = "#{schema.table}_#{element.name}" end join = { :type => join_type, :from => schema.table, :to => element.mapper.schema.table, :keys => keys, :condition => condition, :as => as } elsif (element.has_single_reverse? && element.mapper.schema.has_foreign_fields?(element.reverse)) # n/1 <-> n #Spider::Logger.debug("JOIN B from #{@model} to #{element.name}") keys = {} @model.primary_keys.each do |key| our_field = nil if (key.integrated?) our_field = schema.foreign_key_field(key.integrated_from.name, key.integrated_from_element) else our_field = schema.field(key.name) end keys[our_field] = element.mapper.schema.foreign_key_field(element.reverse, key.name) end if (element.condition) condition, condition_joins, condition_remaining = element.mapper.prepare_condition(element.condition) end join = { :type => join_type, :from => schema.table, :to => element.mapper.schema.table, :keys => keys, :condition => condition } else # n <-> n # no need to handle n <-> n end # FIXME: add element conditions! return join end |
#get_join_info(model, condition) ⇒ Object
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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 498 def get_join_info(model, condition) join_info = {} condition.each_with_comparison do |k, v, comp| next unless k.respond_to?(:to_sym) element = model.elements[k.to_sym] next unless element next unless model.mapper.mapped?(element) next unless element.model? join_info[k.to_s] = true if !v.nil? || (comp != '=' && comp != 'like' && comp != 'ilike') if v.is_a?(Spider::Model::Condition) el_join_info = get_join_info(element.model, v) el_join_info.each do |jk, jv| join_info["#{k}.#{jk}"] = jv end end end condition.subconditions.each do |sub_cond| sub_join_info = get_join_info(model, sub_cond) if condition.conjunction == :or join_info.each_key do |k| join_info.delete(k) unless sub_join_info[k] end else join_info.merge!(sub_join_info) end end join_info end |
#get_schema ⇒ Object
Returns the schema, as defined or autogenerated.
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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 959 def get_schema schema = @model.superclass.mapper.get_schema() if (@model.attributes[:inherit_storage]) if @schema_define_procs schema = DbSchema.new @schema_define_procs.each do |schema_proc| schema.instance_eval(&schema_proc) end end schema = generate_schema(schema) if @schema_procs @schema_procs.each do |schema_proc| schema.instance_eval(&schema_proc) end end return schema end |
#have_references?(element) ⇒ Boolean
Checks if the schema has some key to reach element.
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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 24 def have_references?(element) #:nodoc: element = @model.elements[element] unless element.is_a?(Element) schema.has_foreign_fields?(element.name) || schema.field(element.name) end |
#lock(obj = nil, mode = :exclusive) ⇒ Object
Lock db – FIXME
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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 195 def lock(obj=nil, mode=:exclusive) #:nodoc: return storage.lock(@schema.table) unless obj end |
#map(request, result, obj_or_model) ⇒ Object
Implements the Mapper#map method. Converts a DB result row to an object.
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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 248 def map(request, result, obj_or_model) if (!request || request == true) request = Request.new @model.elements_array.each{ |el| request.request(el.name) } end model = obj_or_model.is_a?(Class) ? obj_or_model : obj_or_model.model data = {} request.keys.each do |element_name| element = @model.elements[element_name] result_value = nil next if !element || element.integrated? || !have_references?(element) if (element.model? && schema.has_foreign_fields?(element.name)) pks = {} keys_set = true element.model.primary_keys.each do |key| key_val = result[schema.foreign_key_field(element_name, key.name).name] keys_set = false unless key_val pks[key.name] = map_back_value(key.type, key_val) end # begin data[element_name] = keys_set ? Spider::Model.get(element.model, pks, true) : nil # rescue IdentityMapperException # null keys, nothing to set # end elsif !element.model? data[element_name] = map_back_value(element.type, result[schema.field(element_name).name]) end end begin obj = Spider::Model.get(model, data, true) rescue IdentityMapperException => exc # This should not happen Spider::Logger.warn("Row in DB without primary keys for model #{model}; won't be mapped:") Spider::Logger.warn(data) return nil end data.keys.each{ |el| obj.element_loaded(el) } if (request.polymorphs) request.polymorphs.each do |model, polym_request| polym_result = {} polym_request.keys.each do |element_name| field = model.mapper.schema.field(element_name).name res_field = "#{model.mapper.schema.table}_#{field}" polym_result[field] = result[res_field] if result[res_field] end if (!polym_result.empty?) polym_obj = model.new polym_obj = polym_obj.mapper.map(polym_request, polym_result, polym_obj) polym_obj.set_loaded_value(model.extended_models[@model], obj) obj = polym_obj break end end end return obj end |
#map_back_value(type, value) ⇒ Object
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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 830 def map_back_value(type, value) case type.name when 'Spider::DataTypes::Bool' return value if value.nil? return value == 1 ? true : false end return super end |
#map_type(type) ⇒ Object
Returns a type accepted by the storage for type.
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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 806 def map_type(type) st = type return Fixnum if st <= Spider::DataTypes::PK while (st && !storage.class.base_types.include?(st)) st = Model.simplify_type(st) end return type unless st return st end |
#map_value(type, value, mode = nil) ⇒ Object
Converts a value in one accepted by the storage.
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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 817 def map_value(type, value, mode=nil) return value if value.nil? case type.name when 'Spider::DataTypes::Bool' value = value ? 1 : 0 else value = super end return value end |
#max(element, condition = nil) ⇒ Object
Aggregates #
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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 1242 def max(element, condition=nil) element = @model.elements[element] if element.is_a?(Symbol) schema = element.integrated? ? @model.elements[element.integrated_from.name].model.mapper.schema : self.schema max = {} max[:condition], joins = prepare_condition(condition) if condition max[:tables] = [schema.table] max[:field] = schema.field(element.name) joins ||= [] max[:joins] = prepare_joins(joins) sql, values = storage.sql_max(max) res = storage.execute(sql, *values) return res[0] && res[0]['M'] ? res[0]['M'] : 0 end |
#pk ⇒ Object
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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 19 def pk [Fixnum, {:autoincrement => true}] end |
#prepare_condition(condition, options = {}) ⇒ Object
Generates a storage description for the condition Returns a list of three elements, composed of
-
conditions: an hash
{ :conj => 'and'|'or', :values => an array of [field, comparison, value] triplets }
-
joins: an array of structures as returned by #get_join
-
remaining_condition: part of the condition which can’t be passed to the storage
– TODO: better name for :values
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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 485 def prepare_condition(condition, ={}) model = condition.polymorph ? condition.polymorph : @model model_schema = model.mapper.schema cond = {} bind_values = [] joins = [:joins] || [] remaining_condition = Condition.new # TODO: implement cond[:conj] = condition.conjunction.to_s cond[:values] = [] def get_join_info(model, condition) join_info = {} condition.each_with_comparison do |k, v, comp| next unless k.respond_to?(:to_sym) element = model.elements[k.to_sym] next unless element next unless model.mapper.mapped?(element) next unless element.model? join_info[k.to_s] = true if !v.nil? || (comp != '=' && comp != 'like' && comp != 'ilike') if v.is_a?(Spider::Model::Condition) el_join_info = get_join_info(element.model, v) el_join_info.each do |jk, jv| join_info["#{k}.#{jk}"] = jv end end end condition.subconditions.each do |sub_cond| sub_join_info = get_join_info(model, sub_cond) if condition.conjunction == :or join_info.each_key do |k| join_info.delete(k) unless sub_join_info[k] end else join_info.merge!(sub_join_info) end end join_info end join_info = [:join_info] join_info ||= get_join_info(@model, condition) condition.each_with_comparison do |k, v, comp| if k.is_a?(QueryFuncs::Function) field = prepare_queryfunc(k) cond[:values] << [field, comp, v] joins += field.joins next end element = model.elements[k.to_sym] next unless model.mapper.mapped?(element) if (element.model?) el_join_info = {} join_info.each do |jk, jv| if jk.index(k.to_s+'.') == 0 el_join_info[jk[k.to_s.length..-1]] = jv end end if (v && model.mapper.have_references?(element.name) && v.select{ |key, value| !element.model.elements[key] || !element.model.elements[key].primary_key? }.empty?) # 1/n <-> 1 with only primary keys element_cond = {:conj => 'AND', :values => []} v.each_with_comparison do |el_k, el_v, el_comp| field = model_schema.qualified_foreign_key_field(element.name, el_k) el_comp ||= '=' op = el_comp field_cond = [field, op, map_condition_value(element.model.elements[el_k.to_sym].type, el_v)] element_cond[:values] << field_cond end cond[:values] << element_cond else if (element.storage == model.mapper.storage) join_type = join_info[element.name.to_s] ? :inner : :left sub_join = model.mapper.get_join(element, join_type) # FIXME! cleanup, and apply the check to joins acquired in other places, too (maybe pass the current joins to get_join) existent = joins.select{ |j| j[:to] == sub_join[:to] } j_cnt = nil had_join = false existent.each do |j| if sub_join[:to] == j[:to] && sub_join[:keys] == j[:keys] && sub_join[:conditions] == j[:conditions] j[:type] = :left if sub_join[:type] == :left sub_join = j had_join = true break else j_cnt ||= 0; j_cnt += 1 end end sub_join[:as] = "#{sub_join[:to]}#{j_cnt}" if j_cnt joins << sub_join unless had_join if v.nil? && comp == '=' el_model_schema = model_schema element_cond = {:conj => 'AND', :values => []} if model.mapper.have_references?(element.name) el_name = element.name el_model = element.model else el_model = element.type el_model_schema = element.model.mapper.schema el_name = element.attributes[:junction_their_element] end el_model.primary_keys.each do |k| field = el_model_schema.qualified_foreign_key_field(el_name, k.name) field_cond = [field, comp, map_condition_value(element.model.elements[k.name].type, nil)] element_cond[:values] << field_cond end cond[:values] << element_cond elsif v v = element.model.mapper.preprocess_condition(v) sub_condition, sub_joins = element.mapper.prepare_condition(v, :table => sub_join[:as], :joins => joins, :join_info => el_join_info) sub_condition[:table] = sub_join[:as] if sub_join[:as] joins = sub_joins cond[:values] << sub_condition end else remaining_condition ||= Condition.new remaining_condition.set(k, comp, v) end end elsif(model_schema.field(element.name)) field = model_schema.qualified_field(element.name, [:table]) op = comp ? comp : '=' if (v.is_a?(Spider::QueryFuncs::Expression)) v_joins = prepare_expression(v) joins += v_joins cond[:values] << [field, op, v] else cond[:values] << [field, op, map_condition_value(model.elements[k.to_sym].type, v)] end end end sub_sqls = [] sub_bind_values = [] condition.subconditions.each do |sub| sub_res = self.prepare_condition(sub, :joins => joins, :join_info => join_info) cond[:values] << sub_res[0] joins = sub_res[1] remaining_condition += sub_res[2] end return [cond, joins, remaining_condition] end |
#prepare_expression(expr) ⇒ Object
Takes a Spider::QueryFuncs::Expression, and associates the fields to the corresponding elements Returns an array of needed joins
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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 757 def prepare_expression(expr) joins = [] expr.each_element do |v_el| v_joins, j_model, j_el = get_deep_join(v_el) db_field = j_model.mapper.schema.qualified_field(j_el.name) joins += v_joins expr[v_el] = db_field end return joins end |
#prepare_insert(obj) ⇒ Object
Insert preprocessing
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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 132 def prepare_insert(obj) #:nodoc: save = prepare_save(obj, :insert) return nil unless save[:values].length > 0 save[:table] = @schema.table return @storage.sql_insert(save) end |
#prepare_joins(joins) ⇒ Object
– FIXME: document
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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 437 def prepare_joins(joins) # :nodoc: h = {} left_joins = [] joins.each do |join| h[join[:from]] ||= {} cur = (h[join[:from]][join[:to]] ||= []) has_join = false cur.each do |cur_join| if (cur_join[:keys] == join[:keys] && cur_join[:conditions] == join[:conditions]) cur_join[:type] = :left if join[:type] == :left has_join = true break end end left_joins << join if join[:type] == :left h[join[:from]][join[:to]] << join unless has_join end while left_joins.length > 0 new_left_joins = [] left_joins.each do |lj| if h[lj[:to]] h[lj[:to]].each_key do |to| h[lj[:to]][to].each do |j| unless j[:type] == :left new_left_joins << j j[:type] = :left end end end end end left_joins = new_left_joins end return h end |
#prepare_order(query) ⇒ Object
Returns a pair composed of
-
fields, an array of [field, direction] couples; and
-
joins, joins needed for the order, if any
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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 771 def prepare_order(query) joins = [] fields = [] query.order.each do |order| order_element, direction = order el_model = @model if (order_element.is_a?(QueryFuncs::Function)) field = prepare_queryfunc(order_element) joins += field.joins fields << [field, direction] else el_joins, el_model, el = get_deep_join(order_element) if (el.model?) # FIXME: integrated elements if el.model.storage != storage el.model.primary_keys.each do |pk| fields << [el_model.mapper.schema.foreign_key_field(el.name, pk.name), direction] end else el.model.primary_keys.each do |pk| fields << [el.model.mapper.schema.field(pk.name), direction] end end else raise "Order on unmapped element #{el_model.name}.#{el.name}" unless el_model.mapper.mapped?(el) field = el_model.mapper.schema.field(el.name) fields << [field, direction] end joins += el_joins end end return [fields, joins] end |
#prepare_query_request(request, obj = nil) ⇒ Object
:nodoc:
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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 305 def prepare_query_request(request, obj=nil) #:nodoc: super(request, obj) end |
#prepare_queryfunc(func) ⇒ Object
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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 743 def prepare_queryfunc(func) joins = [] func_elements = func.inner_elements func_elements.each do |el_name, owner_func| el_joins, el_model, el = get_deep_join(el_name) joins += el_joins owner_func.mapper_fields ||= {} owner_func.mapper_fields[el.name] = el_model.mapper.schema.field(el.name) end return FieldFunction.new(storage.function(func), schema.table, joins) end |
#prepare_save(obj, save_mode) ⇒ Object
Save preprocessing
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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 87 def prepare_save(obj, save_mode) #:nodoc: values = {} obj.no_autoload do @model.each_element do |element| next if !mapped?(element) || element.integrated? next if save_mode == :update && !obj.element_modified?(element) if (save_mode == :insert) if element.attributes[:autoincrement] && !schema.attributes(element.name)[:autoincrement] obj.set(element.name, @storage.sequence_next(schema.sequence(element.name))) end end if (!element.multiple?) next if (save_mode == :update && element.primary_key?) next if (element.model? && !schema.has_foreign_fields?(element.name)) element_val = obj.get(element) # next if (element.model? && (!(element_val = obj.get(element)) || !)) next if (element.integrated?) element_val = nil if element.model? && element_val.is_a?(BaseModel) && !element_val.primary_keys_set? if (element.model?) element.model.primary_keys.each do |key| # FIXME! only works with one primary key if (key.model?) key_type = key.model.primary_keys[0].type key_value = element_val ? element_val.get(key.name).get(key.model.primary_keys[0]) : nil else key_type = key.model? ? key.model.primary_keys[0].type : key.type key_value = element_val ? element_val.get(key.name) : nil end store_key = schema.foreign_key_field(element.name, key.name) next if store_key.is_a?(FieldExpression) values[store_key] = map_save_value(key_type, key_value, save_mode) end else store_key = schema.field(element.name) values[store_key] = map_save_value(element.type, element_val, save_mode) end end end end return { :values => values } end |
#prepare_select(query) ⇒ Object
Generates a select hash description based on the query.
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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 316 def prepare_select(query) #:nodoc: condition, joins = prepare_condition(query.condition) elements = query.request.keys.select{ |k| mapped?(k) } keys = [] primary_keys = [] types = {} if (query.limit && query.order.empty? && !query.only_one?) @model.primary_keys.each do |key| elements << key.name unless elements.include?(key.name) query.order_by(key.name, :asc) end end order, order_joins = prepare_order(query) cnt = 0 order_joins.each do |oj| oj[:as] ||= "ORD#{cnt+=1}" if joins.select{ |j| j[:to] == oj[:to] }.length > 0 end joins += order_joins if order_joins seen_fields = {} model_pks = [] @model.primary_keys.each do |pk| if (pk.integrated?) model_pks << pk.integrated_from.name else model_pks << pk.name end end elements.each do |el| element = @model.elements[el.to_sym] next if !element || !element.type || element.integrated? if !element.model? field = schema.field(el) primary_keys << field if model_pks.include?(el) unless seen_fields[field.name] keys << field seen_fields[field.name] = true end elsif !element.attributes[:junction] if schema.has_foreign_fields?(el) element.model.primary_keys.each do |key| field = schema.foreign_key_field(el, key.name) raise "Can't find a foreign key field for key #{key.name} of element #{el} of model #{@model}" unless field primary_keys << field if model_pks.include?(el) unless seen_fields[field.name] keys << field seen_fields[field.name] = true end end end sub_request = query.request[element.name] # if (can_join?(element) && sub_request.is_a?(Request) && # sub_request.select{|k, v| !element.model.elements[k].primary_key?}.length > 0) # sub_request = element.mapper.prepare_query_request(sub_request).reject{ |name, req| element.reverse == name } # sub_select = element.mapper.prepare_select(Query.new(nil, sub_request)) # keys += sub_select[:keys] # joins << get_join(element) # end end end if (query.request.polymorphs? || !query.condition.polymorphs.empty?) only_conditions = {:conj => 'or', :values => []} if (query.request.only_polymorphs?) polymorphs = (query.request.polymorphs.keys + query.condition.polymorphs).uniq polymorphs.each do |model| polym_request = query.request.polymorphs[model] || Request.new extension_element = model.extended_models[@model] model.mapper.prepare_query_request(polym_request) polym_request.reject!{|k, v| model.elements[k].integrated? && model.elements[k].integrated_from.name == extension_element } polym_only = {:conj => 'and', :values => []} if (query.request.only_polymorphs?) model.elements_array.select{ |el| el.attributes[:local_pk] }.each do |el| polym_request[el.name] = true if (query.request.only_polymorphs?) polym_only[:values] << [model.mapper.schema.qualified_field(el.name), '<>', nil] end end only_conditions[:values] << polym_only if query.request.only_polymorphs? polym_select = model.mapper.prepare_select(Query.new(nil, polym_request)) # FIXME! polym_select[:keys].map!{ |key| "#{key} AS #{key.to_s.gsub('.', '_')}"} keys += polym_select[:keys] join_fields = {} @model.primary_keys.each do |key| from_field = @schema.field(key.name) to_field = model.mapper.schema.foreign_key_field(extension_element, key.name) join_fields[from_field] = to_field end # FIXME: move to get_join join = { :type => :left, :from => @schema.table, :to => model.mapper.schema.table, :keys => join_fields } joins << join end end if (only_conditions) if (condition[:conj].downcase != 'and') condition = {:conj => 'and', :values => [condition]} end condition[:values] << only_conditions end tables = [schema.table] joins = prepare_joins(joins) return nil if (keys.empty?) return { :query_type => :select, :keys => keys, :primary_keys => primary_keys.uniq, :tables => tables, :condition => condition, :joins => joins, :order => order, :offset => query.offset, :limit => query.limit } end |
#prepare_update(obj) ⇒ Object
Update preprocessing
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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 140 def prepare_update(obj) #:nodoc: save = prepare_save(obj, :update) return nil unless save[:values].length > 0 condition = Condition.and @model.primary_keys.each do |key| condition[key.name] = obj.get(key) end preprocess_condition(condition) save[:condition], save[:joins] = prepare_condition(condition) save[:joins] = prepare_joins(save[:joins]) save[:table] = @schema.table return @storage.sql_update(save) end |
#schema ⇒ Object
Returns @schema, or creates one.
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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 953 def schema @schema ||= get_schema() return @schema end |
#sequence_next(name) ⇒ Object
Next value for the named sequence
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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 200 def sequence_next(name) return storage.sequence_next(schema.sequence(name)) end |
#someone_have_references?(element) ⇒ Boolean
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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 29 def someone_have_references?(element) element = @model.elements[element] unless element.is_a?(Element) if (element.integrated?) return element.model.someone_have_references?(element.attributes[:integrated_from_element]) end return have_references?(element) end |
#sql_execute(sql, *values) ⇒ Object
Execute SQL directly, returning raw db results.
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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 82 def sql_execute(sql, *values) storage.execute(sql, *values) end |
#storage_column_attributes(type, attributes) ⇒ Object
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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 980 def storage_column_attributes(type, attributes) @storage.column_attributes(type, attributes) end |
#storage_column_type(type, attributes) ⇒ Object
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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 976 def storage_column_type(type, attributes) @storage.column_type(type, attributes) end |
#sync_schema(force = false, options = {}) ⇒ Object
Modifies the storage according to the schema.
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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 1112 def sync_schema(force=false, ={}) compute_foreign_key_constraints unless [:no_foreign_key_constraints] || !storage.supports?(:foreign_keys) schema_description = schema.get_schemas sequences = {} sequences[schema.table] = schema.sequences @model.elements_array.select{ |el| el.attributes[:anonymous_model] }.each do |el| next if el.model.mapper.class != self.class el.model.mapper.compute_foreign_key_constraints schema_description.merge!(el.model.mapper.schema.get_schemas) sequences[el.model.mapper.schema.table] ||= {} sequences[el.model.mapper.schema.table].merge!(el.model.mapper.schema.sequences) # Spider::Logger.debug("MERGING SEQUENCES:") # Spider::Logger.debug(el.model.mapper.schema.sequences) # sequences.merge!(el.model.mapper.schema.sequences) end schema_description.each do |table_name, table_schema| table_attributes = { :primary_keys => table_schema[:attributes][:primary_keys] } unless [:no_foreign_key_constraints] || !storage.supports?(:foreign_keys) table_attributes[:foreign_key_constraints] = table_schema[:attributes][:foreign_key_constraints] || [] end if @storage.table_exists?(table_name) alter_table(table_name, table_schema, table_attributes, force) else create_table(table_name, table_schema, table_attributes) end if ([:drop_fields]) current = @storage.describe_table(table_name)[:columns] current.each_key do |cur| @storage.drop_field(table_name, cur) if (!table_schema[:columns][cur]) end end end seen = {} sequences.each do |sequence_table, table_sequences| table_sequences.each do |element_name, db_name| next if seen[db_name] if storage.sequence_exists?(db_name) if ([:update_sequences]) sql = "SELECT MAX(#{schema.field(element_name).name}) AS M FROM #{sequence_table}" res = @storage.execute(sql) max = res[0]['M'].to_i storage.update_sequence(db_name, max+1) end else storage.create_sequence(db_name) end seen[db_name] = true end end end |
#truncate! ⇒ Object
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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 72 def truncate! sql = storage.sql_truncate(schema.table) storage.execute(sql) end |
#with_schema(&proc) ⇒ Object
Extend schema. Given block will be instance_eval’d after schema auto generation. See also #define_schema.
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# File 'lib/spiderfw/model/mappers/db_mapper.rb', line 940 def with_schema(&proc) @schema_procs ||= [] @schema_procs << proc end |