Class: ActiveRecord::ConnectionAdapters::AbstractAdapter
- Inherits:
-
Object
- Object
- ActiveRecord::ConnectionAdapters::AbstractAdapter
- Includes:
- ColumnDumper, DatabaseLimits, DatabaseStatements, QueryCache, Quoting, Savepoints, SchemaStatements, ActiveSupport::Callbacks
- Defined in:
- lib/active_record/connection_adapters/abstract_adapter.rb,
lib/active_record/connection_adapters/abstract/schema_creation.rb
Overview
Active Record supports multiple database systems. AbstractAdapter and related classes form the abstraction layer which makes this possible. An AbstractAdapter represents a connection to a database, and provides an abstract interface for database-specific functionality such as establishing a connection, escaping values, building the right SQL fragments for :offset
and :limit
options, etc.
All the concrete database adapters follow the interface laid down in this class. ActiveRecord::Base.connection returns an AbstractAdapter object, which you can use.
Most of the methods in the adapter are useful during migrations. Most notably, the instance methods provided by SchemaStatements are very useful.
Direct Known Subclasses
Defined Under Namespace
Classes: BindCollector, SQLString, SchemaCreation, Version
Constant Summary collapse
- ADAPTER_NAME =
"Abstract".freeze
- SIMPLE_INT =
/\A\d+\z/
Instance Attribute Summary collapse
-
#logger ⇒ Object
readonly
Returns the value of attribute logger.
-
#owner ⇒ Object
(also: #in_use?)
readonly
Returns the value of attribute owner.
-
#pool ⇒ Object
Returns the value of attribute pool.
-
#prepared_statements ⇒ Object
readonly
Returns the value of attribute prepared_statements.
-
#schema_cache ⇒ Object
Returns the value of attribute schema_cache.
-
#visitor ⇒ Object
Returns the value of attribute visitor.
Attributes included from QueryCache
#query_cache, #query_cache_enabled
Attributes included from DatabaseStatements
Class Method Summary collapse
Instance Method Summary collapse
-
#active? ⇒ Boolean
Checks whether the connection to the database is still active.
-
#adapter_name ⇒ Object
Returns the human-readable name of the adapter.
-
#arel_visitor ⇒ Object
:nodoc:.
- #case_insensitive_comparison(table, attribute, column, value) ⇒ Object
- #case_sensitive_comparison(table, attribute, column, value) ⇒ Object
-
#clear_cache! ⇒ Object
Clear any caching the database adapter may be doing, for example clearing the prepared statement cache.
-
#close ⇒ Object
Check the connection back in to the connection pool.
- #collector ⇒ Object
-
#column_name_for_operation(operation, node) ⇒ Object
:nodoc:.
- #combine_bind_parameters(from_clause: [], join_clause: [], where_clause: [], having_clause: [], limit: nil, offset: nil) ⇒ Object
-
#disable_extension(name) ⇒ Object
This is meant to be implemented by the adapters that support extensions.
-
#disable_referential_integrity ⇒ Object
Override to turn off referential integrity while executing
&block
. -
#disconnect! ⇒ Object
Disconnects from the database if already connected.
-
#enable_extension(name) ⇒ Object
This is meant to be implemented by the adapters that support extensions.
-
#expire ⇒ Object
this method must only be called while holding connection pool’s mutex.
-
#extensions ⇒ Object
A list of extensions, to be filled in by adapters that support them.
-
#get_advisory_lock(lock_id) ⇒ Object
This is meant to be implemented by the adapters that support advisory locks.
-
#index_algorithms ⇒ Object
A list of index algorithms, to be filled by adapters that support them.
-
#initialize(connection, logger = nil, config = {}) ⇒ AbstractAdapter
constructor
:nodoc:.
-
#lease ⇒ Object
this method must only be called while holding connection pool’s mutex.
-
#lookup_cast_type(sql_type) ⇒ Object
:nodoc:.
-
#new_column(name, default, sql_type_metadata, null, table_name, default_function = nil, collation = nil) ⇒ Object
:nodoc:.
-
#prefetch_primary_key?(table_name = nil) ⇒ Boolean
Should primary key values be selected from their corresponding sequence before the insert statement? If true, next_sequence_value is called before each insert to set the record’s primary key.
-
#raw_connection ⇒ Object
Provides access to the underlying database driver for this adapter.
-
#reconnect! ⇒ Object
Disconnects from the database if already connected, and establishes a new connection with the database.
-
#release_advisory_lock(lock_id) ⇒ Object
This is meant to be implemented by the adapters that support advisory locks.
-
#requires_reloading? ⇒ Boolean
Returns true if its required to reload the connection between requests for development mode.
-
#reset! ⇒ Object
Reset the state of this connection, directing the DBMS to clear transactions and other connection-related server-side state.
- #schema_creation ⇒ Object
-
#steal! ⇒ Object
this method must only be called while holding connection pool’s mutex (and a desire for segfaults).
-
#supports_advisory_locks? ⇒ Boolean
Does this adapter support application-enforced advisory locking?.
- #supports_bulk_alter? ⇒ Boolean
-
#supports_comments? ⇒ Boolean
Does this adapter support metadata comments on database objects (tables, columns, indexes)?.
-
#supports_comments_in_create? ⇒ Boolean
Can comments for tables, columns, and indexes be specified in create/alter table statements?.
-
#supports_datetime_with_precision? ⇒ Boolean
Does this adapter support datetime with precision?.
-
#supports_ddl_transactions? ⇒ Boolean
Does this adapter support DDL rollbacks in transactions? That is, would CREATE TABLE or ALTER TABLE get rolled back by a transaction?.
-
#supports_explain? ⇒ Boolean
Does this adapter support explain?.
-
#supports_expression_index? ⇒ Boolean
Does this adapter support expression indices?.
-
#supports_extensions? ⇒ Boolean
Does this adapter support database extensions?.
-
#supports_index_sort_order? ⇒ Boolean
Does this adapter support index sort order?.
-
#supports_json? ⇒ Boolean
Does this adapter support json data type?.
-
#supports_migrations? ⇒ Boolean
Does this adapter support migrations?.
-
#supports_multi_insert? ⇒ Boolean
Does this adapter support multi-value insert?.
-
#supports_partial_index? ⇒ Boolean
Does this adapter support partial indices?.
-
#supports_primary_key? ⇒ Boolean
Can this adapter determine the primary key for tables not attached to an Active Record class, such as join tables?.
-
#supports_savepoints? ⇒ Boolean
Does this adapter support savepoints?.
-
#supports_transaction_isolation? ⇒ Boolean
Does this adapter support setting the isolation level for a transaction?.
-
#supports_views? ⇒ Boolean
Does this adapter support views?.
-
#type_map ⇒ Object
:nodoc:.
- #unprepared_statement ⇒ Object
- #valid_type?(type) ⇒ Boolean
-
#verify!(*ignored) ⇒ Object
Checks whether the connection to the database is still active (i.e. not stale).
Methods included from Savepoints
#create_savepoint, #current_savepoint_name, #exec_rollback_to_savepoint, #release_savepoint
Methods included from ColumnDumper
#column_spec, #column_spec_for_primary_key, #migration_keys, #prepare_column_options
Methods included from QueryCache
#cache, #clear_query_cache, dirties_query_cache, #disable_query_cache!, #enable_query_cache!, included, #select_all, #uncached
Methods included from DatabaseLimits
#allowed_index_name_length, #column_name_length, #columns_per_multicolumn_index, #columns_per_table, #in_clause_length, #index_name_length, #indexes_per_table, #joins_per_query, #sql_query_length, #table_alias_length, #table_name_length
Methods included from Quoting
#fetch_type_metadata, #lookup_cast_type_from_column, #prepare_binds_for_database, #quote, #quote_column_name, #quote_default_expression, #quote_string, #quote_table_name, #quote_table_name_for_assignment, #quoted_date, #quoted_false, #quoted_time, #quoted_true, #type_cast, #type_cast_from_column, #type_casted_binds, #unquoted_false, #unquoted_true
Methods included from DatabaseStatements
#add_transaction_record, #begin_db_transaction, #begin_isolated_db_transaction, #cacheable_query, #commit_db_transaction, #default_sequence_name, #delete, #empty_insert_statement_value, #exec_delete, #exec_insert, #exec_query, #exec_rollback_db_transaction, #exec_update, #execute, #insert, #insert_fixture, #join_to_update, #reset_sequence!, #reset_transaction, #rollback_db_transaction, #rollback_to_savepoint, #sanitize_limit, #select_all, #select_one, #select_rows, #select_value, #select_values, #supports_statement_cache?, #to_sql, #transaction, #transaction_isolation_levels, #transaction_open?, #transaction_state, #truncate, #update
Methods included from SchemaStatements
#add_column, #add_foreign_key, #add_index, #add_index_options, #add_reference, #add_timestamps, #assume_migrated_upto_version, #change_column, #change_column_comment, #change_column_default, #change_column_null, #change_table, #change_table_comment, #column_exists?, #columns, #columns_for_distinct, #create_join_table, #create_table, #data_source_exists?, #data_sources, #drop_join_table, #drop_table, #dump_schema_information, #foreign_key_column_for, #foreign_key_exists?, #foreign_key_for, #foreign_key_for!, #foreign_key_options, #foreign_keys, #index_exists?, #index_name, #index_name_exists?, #initialize_internal_metadata_table, #initialize_schema_migrations_table, #insert_versions_sql, #internal_string_options_for_primary_key, #native_database_types, #options_include_default?, #primary_key, #remove_column, #remove_columns, #remove_foreign_key, #remove_index, #remove_reference, #remove_timestamps, #rename_column, #rename_index, #rename_table, #table_alias_for, #table_comment, #table_exists?, #table_options, #tables, #type_to_sql, #update_table_definition, #view_exists?, #views
Constructor Details
#initialize(connection, logger = nil, config = {}) ⇒ AbstractAdapter
:nodoc:
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# File 'lib/active_record/connection_adapters/abstract_adapter.rb', line 98 def initialize(connection, logger = nil, config = {}) # :nodoc: super() @connection = connection @owner = nil @instrumenter = ActiveSupport::Notifications.instrumenter @logger = logger @config = config @pool = nil @schema_cache = SchemaCache.new self @quoted_column_names, @quoted_table_names = {}, {} @visitor = arel_visitor if self.class.type_cast_config_to_boolean(config.fetch(:prepared_statements) { true }) @prepared_statements = true @visitor.extend(DetermineIfPreparableVisitor) else @prepared_statements = false end end |
Instance Attribute Details
#logger ⇒ Object (readonly)
Returns the value of attribute logger.
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# File 'lib/active_record/connection_adapters/abstract_adapter.rb', line 77 def logger @logger end |
#owner ⇒ Object (readonly) Also known as: in_use?
Returns the value of attribute owner.
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# File 'lib/active_record/connection_adapters/abstract_adapter.rb', line 77 def owner @owner end |
#pool ⇒ Object
Returns the value of attribute pool.
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# File 'lib/active_record/connection_adapters/abstract_adapter.rb', line 76 def pool @pool end |
#prepared_statements ⇒ Object (readonly)
Returns the value of attribute prepared_statements.
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# File 'lib/active_record/connection_adapters/abstract_adapter.rb', line 96 def prepared_statements @prepared_statements end |
#schema_cache ⇒ Object
Returns the value of attribute schema_cache.
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# File 'lib/active_record/connection_adapters/abstract_adapter.rb', line 77 def schema_cache @schema_cache end |
#visitor ⇒ Object
Returns the value of attribute visitor.
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# File 'lib/active_record/connection_adapters/abstract_adapter.rb', line 76 def visitor @visitor end |
Class Method Details
.type_cast_config_to_boolean(config) ⇒ Object
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# File 'lib/active_record/connection_adapters/abstract_adapter.rb', line 88 def self.type_cast_config_to_boolean(config) if config == "false" false else config end end |
.type_cast_config_to_integer(config) ⇒ Object
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# File 'lib/active_record/connection_adapters/abstract_adapter.rb', line 80 def self.type_cast_config_to_integer(config) if config =~ SIMPLE_INT config.to_i else config end end |
Instance Method Details
#active? ⇒ Boolean
Checks whether the connection to the database is still active. This includes checking whether the database is actually capable of responding, i.e. whether the connection isn’t stale.
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# File 'lib/active_record/connection_adapters/abstract_adapter.rb', line 379 def active? end |
#adapter_name ⇒ Object
Returns the human-readable name of the adapter. Use mixed case - one can always use downcase if needed.
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# File 'lib/active_record/connection_adapters/abstract_adapter.rb', line 222 def adapter_name self.class::ADAPTER_NAME end |
#arel_visitor ⇒ Object
:nodoc:
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# File 'lib/active_record/connection_adapters/abstract_adapter.rb', line 152 def arel_visitor # :nodoc: Arel::Visitors::ToSql.new(self) end |
#case_insensitive_comparison(table, attribute, column, value) ⇒ Object
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# File 'lib/active_record/connection_adapters/abstract_adapter.rb', line 444 def case_insensitive_comparison(table, attribute, column, value) if can_perform_case_insensitive_comparison_for?(column) table[attribute].lower.eq(table.lower(Arel::Nodes::BindParam.new)) else table[attribute].eq(Arel::Nodes::BindParam.new) end end |
#case_sensitive_comparison(table, attribute, column, value) ⇒ Object
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# File 'lib/active_record/connection_adapters/abstract_adapter.rb', line 436 def case_sensitive_comparison(table, attribute, column, value) if value.nil? table[attribute].eq(value) else table[attribute].eq(Arel::Nodes::BindParam.new) end end |
#clear_cache! ⇒ Object
Clear any caching the database adapter may be doing, for example clearing the prepared statement cache. This is database specific.
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# File 'lib/active_record/connection_adapters/abstract_adapter.rb', line 410 def clear_cache! # this should be overridden by concrete adapters end |
#close ⇒ Object
Check the connection back in to the connection pool
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# File 'lib/active_record/connection_adapters/abstract_adapter.rb', line 458 def close pool.checkin self end |
#collector ⇒ Object
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# File 'lib/active_record/connection_adapters/abstract_adapter.rb', line 144 def collector if prepared_statements SQLString.new else BindCollector.new end end |
#column_name_for_operation(operation, node) ⇒ Object
:nodoc:
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# File 'lib/active_record/connection_adapters/abstract_adapter.rb', line 476 def column_name_for_operation(operation, node) # :nodoc: visitor.accept(node, collector).value end |
#combine_bind_parameters(from_clause: [], join_clause: [], where_clause: [], having_clause: [], limit: nil, offset: nil) ⇒ Object
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# File 'lib/active_record/connection_adapters/abstract_adapter.rb', line 480 def combine_bind_parameters( from_clause: [], join_clause: [], where_clause: [], having_clause: [], limit: nil, offset: nil ) # :nodoc: result = from_clause + join_clause + where_clause + having_clause if limit result << limit end if offset result << offset end result end |
#disable_extension(name) ⇒ Object
This is meant to be implemented by the adapters that support extensions
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# File 'lib/active_record/connection_adapters/abstract_adapter.rb', line 336 def disable_extension(name) end |
#disable_referential_integrity ⇒ Object
Override to turn off referential integrity while executing &block
.
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# File 'lib/active_record/connection_adapters/abstract_adapter.rb', line 370 def disable_referential_integrity yield end |
#disconnect! ⇒ Object
Disconnects from the database if already connected. Otherwise, this method does nothing.
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# File 'lib/active_record/connection_adapters/abstract_adapter.rb', line 392 def disconnect! clear_cache! reset_transaction end |
#enable_extension(name) ⇒ Object
This is meant to be implemented by the adapters that support extensions
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# File 'lib/active_record/connection_adapters/abstract_adapter.rb', line 340 def enable_extension(name) end |
#expire ⇒ Object
this method must only be called while holding connection pool’s mutex
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# File 'lib/active_record/connection_adapters/abstract_adapter.rb', line 186 def expire if in_use? if @owner != Thread.current raise ActiveRecordError, "Cannot expire connection, " << "it is owned by a different thread: #{@owner}. " << "Current thread: #{Thread.current}." end @owner = nil else raise ActiveRecordError, 'Cannot expire connection, it is not currently leased.' end end |
#extensions ⇒ Object
A list of extensions, to be filled in by adapters that support them.
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# File 'lib/active_record/connection_adapters/abstract_adapter.rb', line 358 def extensions [] end |
#get_advisory_lock(lock_id) ⇒ Object
This is meant to be implemented by the adapters that support advisory locks
Return true if we got the lock, otherwise false
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# File 'lib/active_record/connection_adapters/abstract_adapter.rb', line 347 def get_advisory_lock(lock_id) # :nodoc: end |
#index_algorithms ⇒ Object
A list of index algorithms, to be filled by adapters that support them.
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# File 'lib/active_record/connection_adapters/abstract_adapter.rb', line 363 def index_algorithms {} end |
#lease ⇒ Object
this method must only be called while holding connection pool’s mutex
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# File 'lib/active_record/connection_adapters/abstract_adapter.rb', line 165 def lease if in_use? msg = 'Cannot lease connection, ' if @owner == Thread.current msg << 'it is already leased by the current thread.' else msg << "it is already in use by a different thread: #{@owner}. " << "Current thread: #{Thread.current}." end raise ActiveRecordError, msg end @owner = Thread.current end |
#lookup_cast_type(sql_type) ⇒ Object
:nodoc:
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# File 'lib/active_record/connection_adapters/abstract_adapter.rb', line 472 def lookup_cast_type(sql_type) # :nodoc: type_map.lookup(sql_type) end |
#new_column(name, default, sql_type_metadata, null, table_name, default_function = nil, collation = nil) ⇒ Object
:nodoc:
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# File 'lib/active_record/connection_adapters/abstract_adapter.rb', line 468 def new_column(name, default, , null, table_name, default_function = nil, collation = nil) # :nodoc: Column.new(name, default, , null, table_name, default_function, collation) end |
#prefetch_primary_key?(table_name = nil) ⇒ Boolean
Should primary key values be selected from their corresponding sequence before the insert statement? If true, next_sequence_value is called before each insert to set the record’s primary key.
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# File 'lib/active_record/connection_adapters/abstract_adapter.rb', line 260 def prefetch_primary_key?(table_name = nil) false end |
#raw_connection ⇒ Object
Provides access to the underlying database driver for this adapter. For example, this method returns a Mysql2::Client object in case of Mysql2Adapter, and a PG::Connection object in case of PostgreSQLAdapter.
This is useful for when you need to call a proprietary method such as PostgreSQL’s lo_* methods.
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# File 'lib/active_record/connection_adapters/abstract_adapter.rb', line 432 def raw_connection @connection end |
#reconnect! ⇒ Object
Disconnects from the database if already connected, and establishes a new connection with the database. Implementors should call super if they override the default implementation.
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# File 'lib/active_record/connection_adapters/abstract_adapter.rb', line 385 def reconnect! clear_cache! reset_transaction end |
#release_advisory_lock(lock_id) ⇒ Object
This is meant to be implemented by the adapters that support advisory locks.
Return true if we released the lock, otherwise false
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# File 'lib/active_record/connection_adapters/abstract_adapter.rb', line 354 def release_advisory_lock(lock_id) # :nodoc: end |
#requires_reloading? ⇒ Boolean
Returns true if its required to reload the connection between requests for development mode.
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# File 'lib/active_record/connection_adapters/abstract_adapter.rb', line 415 def requires_reloading? false end |
#reset! ⇒ Object
Reset the state of this connection, directing the DBMS to clear transactions and other connection-related server-side state. Usually a database-dependent operation.
The default implementation does nothing; the implementation should be overridden by concrete adapters.
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# File 'lib/active_record/connection_adapters/abstract_adapter.rb', line 403 def reset! # this should be overridden by concrete adapters end |
#schema_creation ⇒ Object
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# File 'lib/active_record/connection_adapters/abstract_adapter.rb', line 160 def schema_creation SchemaCreation.new self end |
#steal! ⇒ Object
this method must only be called while holding connection pool’s mutex (and a desire for segfaults)
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# File 'lib/active_record/connection_adapters/abstract_adapter.rb', line 201 def steal! # :nodoc: if in_use? if @owner != Thread.current pool.send :remove_connection_from_thread_cache, self, @owner @owner = Thread.current end else raise ActiveRecordError, 'Cannot steal connection, it is not currently leased.' end end |
#supports_advisory_locks? ⇒ Boolean
Does this adapter support application-enforced advisory locking?
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# File 'lib/active_record/connection_adapters/abstract_adapter.rb', line 253 def supports_advisory_locks? false end |
#supports_bulk_alter? ⇒ Boolean
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# File 'lib/active_record/connection_adapters/abstract_adapter.rb', line 243 def supports_bulk_alter? false end |
#supports_comments? ⇒ Boolean
Does this adapter support metadata comments on database objects (tables, columns, indexes)?
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# File 'lib/active_record/connection_adapters/abstract_adapter.rb', line 321 def supports_comments? false end |
#supports_comments_in_create? ⇒ Boolean
Can comments for tables, columns, and indexes be specified in create/alter table statements?
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# File 'lib/active_record/connection_adapters/abstract_adapter.rb', line 326 def supports_comments_in_create? false end |
#supports_datetime_with_precision? ⇒ Boolean
Does this adapter support datetime with precision?
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# File 'lib/active_record/connection_adapters/abstract_adapter.rb', line 311 def supports_datetime_with_precision? false end |
#supports_ddl_transactions? ⇒ Boolean
Does this adapter support DDL rollbacks in transactions? That is, would CREATE TABLE or ALTER TABLE get rolled back by a transaction?
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# File 'lib/active_record/connection_adapters/abstract_adapter.rb', line 239 def supports_ddl_transactions? false end |
#supports_explain? ⇒ Boolean
Does this adapter support explain?
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# File 'lib/active_record/connection_adapters/abstract_adapter.rb', line 280 def supports_explain? false end |
#supports_expression_index? ⇒ Boolean
Does this adapter support expression indices?
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# File 'lib/active_record/connection_adapters/abstract_adapter.rb', line 275 def supports_expression_index? false end |
#supports_extensions? ⇒ Boolean
Does this adapter support database extensions?
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# File 'lib/active_record/connection_adapters/abstract_adapter.rb', line 290 def supports_extensions? false end |
#supports_index_sort_order? ⇒ Boolean
Does this adapter support index sort order?
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# File 'lib/active_record/connection_adapters/abstract_adapter.rb', line 265 def supports_index_sort_order? false end |
#supports_json? ⇒ Boolean
Does this adapter support json data type?
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# File 'lib/active_record/connection_adapters/abstract_adapter.rb', line 316 def supports_json? false end |
#supports_migrations? ⇒ Boolean
Does this adapter support migrations?
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# File 'lib/active_record/connection_adapters/abstract_adapter.rb', line 227 def supports_migrations? false end |
#supports_multi_insert? ⇒ Boolean
Does this adapter support multi-value insert?
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# File 'lib/active_record/connection_adapters/abstract_adapter.rb', line 331 def supports_multi_insert? true end |
#supports_partial_index? ⇒ Boolean
Does this adapter support partial indices?
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# File 'lib/active_record/connection_adapters/abstract_adapter.rb', line 270 def supports_partial_index? false end |
#supports_primary_key? ⇒ Boolean
Can this adapter determine the primary key for tables not attached to an Active Record class, such as join tables?
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# File 'lib/active_record/connection_adapters/abstract_adapter.rb', line 233 def supports_primary_key? false end |
#supports_savepoints? ⇒ Boolean
Does this adapter support savepoints?
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# File 'lib/active_record/connection_adapters/abstract_adapter.rb', line 248 def supports_savepoints? false end |
#supports_transaction_isolation? ⇒ Boolean
Does this adapter support setting the isolation level for a transaction?
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# File 'lib/active_record/connection_adapters/abstract_adapter.rb', line 285 def supports_transaction_isolation? false end |
#supports_views? ⇒ Boolean
Does this adapter support views?
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# File 'lib/active_record/connection_adapters/abstract_adapter.rb', line 306 def supports_views? false end |
#type_map ⇒ Object
:nodoc:
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# File 'lib/active_record/connection_adapters/abstract_adapter.rb', line 462 def type_map # :nodoc: @type_map ||= Type::TypeMap.new.tap do |mapping| initialize_type_map(mapping) end end |
#unprepared_statement ⇒ Object
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# File 'lib/active_record/connection_adapters/abstract_adapter.rb', line 213 def unprepared_statement old_prepared_statements, @prepared_statements = @prepared_statements, false yield ensure @prepared_statements = old_prepared_statements end |
#valid_type?(type) ⇒ Boolean
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# File 'lib/active_record/connection_adapters/abstract_adapter.rb', line 156 def valid_type?(type) false end |
#verify!(*ignored) ⇒ Object
Checks whether the connection to the database is still active (i.e. not stale). This is done under the hood by calling #active?. If the connection is no longer active, then this method will reconnect to the database.
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# File 'lib/active_record/connection_adapters/abstract_adapter.rb', line 422 def verify!(*ignored) reconnect! unless active? end |