ri > ActiveRecord::ConnectionAdapters::AbstractAdapter

= ActiveRecord::ConnectionAdapters::AbstractAdapter < Object

------------------------------------------------------------------------
= Includes:
(from /home/chedong/.local/share/rdoc)
  ActiveSupport::Callbacks
  DatabaseLimits
  QueryCache
  Savepoints

(from /home/chedong/.local/share/rdoc)
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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(
rdoc-ref:ConnectionHandling#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.
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= Constants:

ADAPTER_NAME:
  [not documented]

COMMENT_REGEX:
  [not documented]

SIMPLE_INT:
  [not documented]


= Class methods:

  database_exists?
  type_cast_config_to_boolean
  type_cast_config_to_integer

= Instance methods:

  active?
  adapter_name
  clear_cache!
  close
  disable_extension
  disable_referential_integrity
  discard!
  disconnect!
  enable_extension
  expire
  extensions
  in_use?
  index_algorithms
  lease
  lock
  log
  logger
  owner
  pool
  prefetch_primary_key?
  prepared_statements
  prepared_statements?
  preventing_writes?
  raw_connection
  reconnect!
  replica?
  requires_reloading?
  reset!
  schema_cache
  schema_cache=
  supports_advisory_locks?
  supports_bulk_alter?
  supports_check_constraints?
  supports_comments?
  supports_comments_in_create?
  supports_common_table_expressions?
  supports_datetime_with_precision?
  supports_ddl_transactions?
  supports_explain?
  supports_expression_index?
  supports_extensions?
  supports_foreign_keys?
  supports_foreign_tables?
  supports_index_sort_order?
  supports_indexes_in_create?
  supports_insert_conflict_target?
  supports_insert_on_duplicate_skip?
  supports_insert_on_duplicate_update?
  supports_insert_returning?
  supports_json?
  supports_lazy_transactions?
  supports_materialized_views?
  supports_optimizer_hints?
  supports_partial_index?
  supports_partitioned_indexes?
  supports_savepoints?
  supports_transaction_isolation?
  supports_validate_constraints?
  supports_views?
  supports_virtual_columns?
  throw_away!
  unprepared_statement
  use_metadata_table?
  verify!
  visitor

= Attributes:

  attr_accessor pool
  attr_reader in_use?
  attr_reader lock
  attr_reader logger
  attr_reader owner
  attr_reader visitor