4bdf703ab2
This release upgrades Instiki to Rails 2.3.4, which patches two security holes in Rails. See http://weblog.rubyonrails.org/2009/9/4/ruby-on-rails-2-3-4 There are also some new features, and the usual boatload of bugfixes. See the CHANGELOG for details.
242 lines
7.8 KiB
Ruby
Executable file
242 lines
7.8 KiB
Ruby
Executable file
require 'benchmark'
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require 'date'
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require 'bigdecimal'
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require 'bigdecimal/util'
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# TODO: Autoload these files
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require 'active_record/connection_adapters/abstract/schema_definitions'
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require 'active_record/connection_adapters/abstract/schema_statements'
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require 'active_record/connection_adapters/abstract/database_statements'
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require 'active_record/connection_adapters/abstract/quoting'
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require 'active_record/connection_adapters/abstract/connection_pool'
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require 'active_record/connection_adapters/abstract/connection_specification'
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require 'active_record/connection_adapters/abstract/query_cache'
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module ActiveRecord
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module ConnectionAdapters # :nodoc:
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# ActiveRecord supports multiple database systems. AbstractAdapter and
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# related classes form the abstraction layer which makes this possible.
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# An AbstractAdapter represents a connection to a database, and provides an
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# abstract interface for database-specific functionality such as establishing
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# a connection, escaping values, building the right SQL fragments for ':offset'
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# and ':limit' options, etc.
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#
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# All the concrete database adapters follow the interface laid down in this class.
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# ActiveRecord::Base.connection returns an AbstractAdapter object, which
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# you can use.
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#
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# Most of the methods in the adapter are useful during migrations. Most
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# notably, the instance methods provided by SchemaStatement are very useful.
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class AbstractAdapter
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include Quoting, DatabaseStatements, SchemaStatements
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include QueryCache
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include ActiveSupport::Callbacks
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define_callbacks :checkout, :checkin
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@@row_even = true
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def initialize(connection, logger = nil) #:nodoc:
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@connection, @logger = connection, logger
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@runtime = 0
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@last_verification = 0
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@query_cache_enabled = false
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end
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# Returns the human-readable name of the adapter. Use mixed case - one
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# can always use downcase if needed.
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def adapter_name
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'Abstract'
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end
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# Does this adapter support migrations? Backend specific, as the
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# abstract adapter always returns +false+.
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def supports_migrations?
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false
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end
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# Can this adapter determine the primary key for tables not attached
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# to an ActiveRecord class, such as join tables? Backend specific, as
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# the abstract adapter always returns +false+.
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def supports_primary_key?
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false
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end
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# Does this adapter support using DISTINCT within COUNT? This is +true+
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# for all adapters except sqlite.
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def supports_count_distinct?
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true
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end
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# Does this adapter support DDL rollbacks in transactions? That is, would
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# CREATE TABLE or ALTER TABLE get rolled back by a transaction? PostgreSQL,
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# SQL Server, and others support this. MySQL and others do not.
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def supports_ddl_transactions?
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false
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end
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# Does this adapter support savepoints? PostgreSQL and MySQL do, SQLite
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# does not.
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def supports_savepoints?
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false
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end
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# Should primary key values be selected from their corresponding
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# sequence before the insert statement? If true, next_sequence_value
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# is called before each insert to set the record's primary key.
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# This is false for all adapters but Firebird.
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def prefetch_primary_key?(table_name = nil)
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false
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end
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def reset_runtime #:nodoc:
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rt, @runtime = @runtime, 0
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rt
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end
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# QUOTING ==================================================
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# Override to return the quoted table name. Defaults to column quoting.
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def quote_table_name(name)
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quote_column_name(name)
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end
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# REFERENTIAL INTEGRITY ====================================
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# Override to turn off referential integrity while executing <tt>&block</tt>.
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def disable_referential_integrity(&block)
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yield
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end
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# CONNECTION MANAGEMENT ====================================
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# Checks whether the connection to the database is still active. This includes
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# checking whether the database is actually capable of responding, i.e. whether
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# the connection isn't stale.
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def active?
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@active != false
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end
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# Disconnects from the database if already connected, and establishes a
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# new connection with the database.
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def reconnect!
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@active = true
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end
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# Disconnects from the database if already connected. Otherwise, this
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# method does nothing.
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def disconnect!
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@active = false
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end
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# Reset the state of this connection, directing the DBMS to clear
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# transactions and other connection-related server-side state. Usually a
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# database-dependent operation.
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#
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# The default implementation does nothing; the implementation should be
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# overridden by concrete adapters.
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def reset!
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# this should be overridden by concrete adapters
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end
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# Returns true if its safe to reload the connection between requests for development mode.
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def requires_reloading?
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true
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end
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# Checks whether the connection to the database is still active (i.e. not stale).
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# This is done under the hood by calling <tt>active?</tt>. If the connection
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# is no longer active, then this method will reconnect to the database.
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def verify!(*ignored)
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reconnect! unless active?
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end
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# Provides access to the underlying database driver for this adapter. For
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# example, this method returns a Mysql object in case of MysqlAdapter,
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# and a PGconn object in case of PostgreSQLAdapter.
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#
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# This is useful for when you need to call a proprietary method such as
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# PostgreSQL's lo_* methods.
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def raw_connection
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@connection
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end
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def open_transactions
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@open_transactions ||= 0
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end
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def increment_open_transactions
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@open_transactions ||= 0
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@open_transactions += 1
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end
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def decrement_open_transactions
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@open_transactions -= 1
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end
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def transaction_joinable=(joinable)
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@transaction_joinable = joinable
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end
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def create_savepoint
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end
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def rollback_to_savepoint
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end
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def release_savepoint
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end
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def current_savepoint_name
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"active_record_#{open_transactions}"
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end
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def log_info(sql, name, ms)
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if @logger && @logger.debug?
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name = '%s (%.1fms)' % [name || 'SQL', ms]
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@logger.debug(format_log_entry(name, sql.squeeze(' ')))
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end
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end
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protected
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def log(sql, name)
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if block_given?
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result = nil
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ms = Benchmark.ms { result = yield }
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@runtime += ms
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log_info(sql, name, ms)
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result
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else
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log_info(sql, name, 0)
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nil
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end
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rescue Exception => e
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# Log message and raise exception.
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# Set last_verification to 0, so that connection gets verified
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# upon reentering the request loop
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@last_verification = 0
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message = "#{e.class.name}: #{e.message}: #{sql}"
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log_info(message, name, 0)
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raise ActiveRecord::StatementInvalid, message
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end
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def format_log_entry(message, dump = nil)
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if ActiveRecord::Base.colorize_logging
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if @@row_even
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@@row_even = false
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message_color, dump_color = "4;36;1", "0;1"
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else
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@@row_even = true
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message_color, dump_color = "4;35;1", "0"
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end
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log_entry = " \e[#{message_color}m#{message}\e[0m "
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log_entry << "\e[#{dump_color}m%#{String === dump ? 's' : 'p'}\e[0m" % dump if dump
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log_entry
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else
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"%s %s" % [message, dump]
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end
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end
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end
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end
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end
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