class AbstractAdapter

Ruby on Rails 3.0.20

Since v2.2.3

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

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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 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 SchemaStatement are very useful.

Inherits from

Object

Includes

Methods (defined here)

Used by

Subclasses (3)

Methods (inherited)

From ActiveRecord::ConnectionAdapters::DatabaseLimits (10)

From ActiveRecord::ConnectionAdapters::QueryCache (6)

From ActiveSupport::Callbacks (2)

# callback
# run_callbacks

From Object (26)

From ActiveSupport::Concern (3)

From ActiveSupport::DescendantsTracker (6)

From Benchmark (1)

self. ms