Log Message:
Update ruby-sequel to 3.42.0.

=== 3.42.0 (2012-12-03)

* If an exception occurs while committing a transaction, attempt to rollback \ 
(jeremyevans)

* Support setting default string column sizes on a per-Database basis via \ 
default_string_column_size (jeremyevans)

* Reset Model.instance_dataset when extending the model's dataset (jeremyevans)

* Make the force_encoding plugin work with frozen strings (jeremyevans)

* Add Database#do on PostgreSQL for using the DO anonymous code block execution \ 
statement (jeremyevans)

* Remove Model.dataset_methods (jeremyevans)

* Allow subset to be called inside a dataset_module block (jeremyevans)

* Make Dataset#avg, #interval, #min, #max, #range, and #sum accept virtual row \ 
blocks (jeremyevans)

* Make Dataset#count use a subselect when the dataset has an offset without a \ 
limit (jeremyevans) (#587)

* Dump deferrable status of unique indexes on PostgreSQL (radford) (#583)

* Extend deferrable constraint support to all types of constraints, not just \ 
foreign keys (radford, jeremyevans) (#583)

* Support Database#copy_table and #copy_into on jdbc/postgres (bdon) (#580)

* Make Dataset#update not use a limit (TOP) on Microsoft SQL Server 2000 \ 
(jeremyevans) (#578)

=== 3.41.0 (2012-11-01)

* Add bin/sequel usage guide (jeremyevans)

* Make Dataset#reverse and #reverse_order accept virtual row blocks (jeremyevans)

* Add Sequel.delay for generic delayed evaluation (jeremyevans)

* Make uniqueness validations correctly handle nil values (jeremyevans)

* Support :unlogged option for create_table on PostgreSQL (JonathanTron) (#575)

* Add ConnectionPool#pool_type to get the type of connection pool in use \ 
(jeremyevans)

* Explicitly mark primary keys as NOT NULL on SQLite (jeremyevans)

* Add support for renaming primary key columns on MySQL (jeremyevans)

* Add connection_validator extension for automatically checking connections and \ 
transparently handling disconnects (jeremyevans)

* Add Database#valid_connection? for checking whether a given connection is \ 
valid (jeremyevans)

* Make dataset.limit(nil, nil) reset offset as well as limit (jeremyevans) (#571)

* Support IMMEDIATE/EXCLUSIVE/DEFERRED transaction modes on SQLite (Eric Wong)

* Major change in the Database <-> ConnectionPool interface (jeremyevans)

* Make touch plugin handle touching of many_*_many associations (jeremyevans)

* Make single_table_inheritance plugin handle non-bijective mappings (hannesg) (#567)

* Support foreign key parsing on MSSQL (munkyboy) (#564)

* Include SQL::AliasMethods in most pg_* extension objects (treydempsey, \ 
jeremyevans) (#563)

* Handle failure to create a prepared statement better in the postgres, mysql, \ 
and mysql2 adapters (jeremyevans) (#560)

* Treat clob columns as strings instead of blobs (jeremyevans)

=== 3.40.0 (2012-09-26)

* Add a cubrid adapter for accessing CUBRID databases via the cubrid gem \ 
(jeremyevans)

* Add a jdbc/cubrid adapter for accessing CUBRID databases via JDBC on JRuby \ 
(jeremyevans)

* Return OCI8::CLOB values as ruby Strings in the Oracle adapter (jeremyevans)

* Use clob for String :text=>true types on Oracle, DB2, HSQLDB, and Derby \ 
(jeremyevans) (#555)

* Allowing marshalling of Sequel::Postgres::HStore (jeremyevans) (#556)

* Quote channel identifier names when using LISTEN/NOTIFY on PostgreSQL (jeremyevans)

* Handle nil values when formatting bound variable arguments in the pg_row \ 
extension (jeremyevans) (#548)

* Handle nil values when parsing composite types in the pg_row extension \ 
(jeremyevans) (#548)

* Add :disconnect=>:retry option to Database#transaction, for automatically \ 
retrying the transaction on disconnect (jeremyevans)

* Greatly improved support on Microsoft Access (jeremyevans)

* Support Database#{schema,tables,views,indexes,foreign_key_list} when using \ 
ado/access adapter (ericgj) (#545, #546)

* Add ado/access adapter for accessing Microsoft Access via the ado adapter \ 
(jeremyevans)

* Combine disconnect error detection for mysql and mysql2 adapters (jeremyevans)

* Update the association_pks plugin to handle composite primary keys (chanks, \ 
jeremyevans) (#544)