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
-
#lock ⇒ Object
readonly
Returns the value of attribute lock.
-
#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
:nodoc:.
-
#case_sensitive_comparison(table, attribute, column, value) ⇒ Object
:nodoc:.
-
#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:.
-
#columns(table_name) ⇒ Object
Returns an array of
Column
objects for the table specified bytable_name
. - #combine_bind_parameters(from_clause: [], join_clause: [], where_clause: [], having_clause: [], limit: nil, offset: nil) ⇒ Object
-
#default_index_type?(index) ⇒ Boolean
:nodoc:.
-
#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_foreign_keys? ⇒ Boolean
Does this adapter support creating foreign key constraints?.
-
#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
:nodoc:.
-
#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
:nodoc:.
-
#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?.
-
#supports_virtual_columns? ⇒ Boolean
Does this adapter support virtual columns?.
-
#type_map ⇒ Object
:nodoc:.
- #unprepared_statement ⇒ Object
-
#valid_type?(type) ⇒ Boolean
:nodoc:.
-
#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, #quote, #quote_column_name, #quote_default_expression, #quote_string, #quote_table_name, #quote_table_name_for_assignment, #quoted_binary, #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, #query, #query_value, #query_values, #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_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?, #indexes, #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 97 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 @lock = ActiveSupport::Concurrency::LoadInterlockAwareMonitor.new 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
#lock ⇒ Object (readonly)
Returns the value of attribute lock.
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# File 'lib/active_record/connection_adapters/abstract_adapter.rb', line 78 def lock @lock end |
#logger ⇒ Object (readonly)
Returns the value of attribute logger.
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# File 'lib/active_record/connection_adapters/abstract_adapter.rb', line 78 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 78 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 77 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 78 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 78 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 77 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 89 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 81 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 397 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 230 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
:nodoc:
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# File 'lib/active_record/connection_adapters/abstract_adapter.rb', line 461 def case_insensitive_comparison(table, attribute, column, value) # :nodoc: if can_perform_case_insensitive_comparison_for?(column) table[attribute].lower.eq(table.lower(value)) else table[attribute].eq(value) end end |
#case_sensitive_comparison(table, attribute, column, value) ⇒ Object
:nodoc:
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# File 'lib/active_record/connection_adapters/abstract_adapter.rb', line 457 def case_sensitive_comparison(table, attribute, column, value) # :nodoc: table[attribute].eq(value) 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 428 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 475 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 493 def column_name_for_operation(operation, node) # :nodoc: visitor.accept(node, collector).value end |
#columns(table_name) ⇒ Object
Returns an array of Column
objects for the table specified by table_name
.
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# File 'lib/active_record/connection_adapters/abstract_adapter.rb', line 165 def columns(table_name) # :nodoc: table_name = table_name.to_s column_definitions(table_name).map do |field| new_column_from_field(table_name, field) end 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 497 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 |
#default_index_type?(index) ⇒ Boolean
:nodoc:
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# File 'lib/active_record/connection_adapters/abstract_adapter.rb', line 515 def default_index_type?(index) # :nodoc: index.using.nil? 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 354 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 388 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 410 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 358 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 194 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 376 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 365 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 381 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 173 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 489 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 485 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 267 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 453 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 403 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 372 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 433 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 421 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 209 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 260 def supports_advisory_locks? false end |
#supports_bulk_alter? ⇒ Boolean
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# File 'lib/active_record/connection_adapters/abstract_adapter.rb', line 250 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 334 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 339 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 324 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 246 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 287 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 282 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 297 def supports_extensions? false end |
#supports_foreign_keys? ⇒ Boolean
Does this adapter support creating foreign key constraints?
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# File 'lib/active_record/connection_adapters/abstract_adapter.rb', line 308 def supports_foreign_keys? 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 272 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 329 def supports_json? false end |
#supports_migrations? ⇒ Boolean
:nodoc:
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# File 'lib/active_record/connection_adapters/abstract_adapter.rb', line 234 def supports_migrations? # :nodoc: true 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 344 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 277 def supports_partial_index? false end |
#supports_primary_key? ⇒ Boolean
:nodoc:
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# File 'lib/active_record/connection_adapters/abstract_adapter.rb', line 239 def supports_primary_key? # :nodoc: true end |
#supports_savepoints? ⇒ Boolean
Does this adapter support savepoints?
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# File 'lib/active_record/connection_adapters/abstract_adapter.rb', line 255 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 292 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 319 def supports_views? false end |
#supports_virtual_columns? ⇒ Boolean
Does this adapter support virtual columns?
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# File 'lib/active_record/connection_adapters/abstract_adapter.rb', line 349 def supports_virtual_columns? false end |
#type_map ⇒ Object
:nodoc:
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# File 'lib/active_record/connection_adapters/abstract_adapter.rb', line 479 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 221 def unprepared_statement old_prepared_statements, @prepared_statements = @prepared_statements, false yield ensure @prepared_statements = old_prepared_statements end |
#valid_type?(type) ⇒ Boolean
:nodoc:
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# File 'lib/active_record/connection_adapters/abstract_adapter.rb', line 156 def valid_type?(type) # :nodoc: !native_database_types[type].nil? 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 440 def verify!(*ignored) if ignored.size > 0 ActiveSupport::Deprecation.warn("Passing arguments to #verify method of the connection has no effect and has been deprecated. Please remove all arguments from the #verify method call.") end reconnect! unless active? end |