class AbstractAdapter

Ruby on Rails 5.2.8.1

Available in: v2.2.3 v2.3.18 v3.0.20 v3.1.12 v3.2.22.5 v4.0.13 v4.1.16 v4.2.9 v5.2.8.1 v6.0.6 v6.1.7.10 v7.0.10 v7.1.6 v7.2.3 v8.0.4 v8.1.2

Compare with: (choosing a version navigates to the comparison)

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.

Inherits from

Object

Namespace

Classes

ActiveRecord::ConnectionAdapters::AbstractAdapter::Version

Includes

Constants

Attributes

Methods (defined here)

Private methods (16)

Show private methods Implementation detail — not part of the public API.

# arel_visitor
# can_perform_case_insensitive_comparison_for?
# collector
# column_for
# extract_limit
# extract_precision
# extract_scale
# initialize_type_map
# log
# register_class_with_limit
# register_class_with_precision
# reload_type_map
# translate_exception
# translate_exception_class
# type_map
# without_prepared_statement?

Used by

Subclasses (3)

Methods (inherited)

From ActiveRecord::ConnectionAdapters::DatabaseLimits (11)

From ActiveRecord::ConnectionAdapters::QueryCache (8)

From ActiveRecord::ConnectionAdapters::Savepoints (4)

From ActiveSupport::Callbacks (1)

# run_callbacks

From Object (17)

From ActiveSupport::Concern (3)

From ActiveSupport::DescendantsTracker (7)