Sequel is a lightweight database access toolkit for Ruby.

* Sequel provides thread safety, connection pooling and a concise
  DSL for constructing SQL queries and table schemas.
* Sequel includes a comprehensive ORM layer for mapping records to
  Ruby objects and handling associated records.
* Sequel supports advanced database features such as prepared
  statements, bound variables, stored procedures, savepoints,
  two-phase commit, transaction isolation, master/slave
  configurations, and database sharding.
* Sequel currently has adapters for ADO, Amalgalite, CUBRID,
  DataObjects, DB2, DBI, Firebird, IBM_DB, Informix, JDBC, MySQL,
  Mysql2, ODBC, OpenBase, Oracle, PostgreSQL, SQLAnywhere, SQLite3,
  Swift, and TinyTDS.

Sequel 4.5.0 has been released!

= New Features

* An mssql_optimistic_locking plugin has been added.  This is similar
  to the regular optimistic_locking plugin, but instead of using an
  integer lock column, it uses a timestamp/rowversion lock column.

* Database#create_table with the :temp=>true option on PostgreSQL now
  supports an :on_commit option.  This option can be set to :drop or
  :delete_rows to either drop or empty the temporary table on
  transaction commit.

= Other Improvements

* Dataset#insert no longer errors on PostgreSQL if the related table
  is a placeholder literal string.

* Unique constraints are now copied when emulating alter_table
  operations on SQLite.

* Clob column values are no longer returned as SQL::Blob instances
  by the db2 and ibmdb adapters unless use_clob_as_blob is true.

* SQL::Blob objects now work correctly as prepared statement
  arguments in the jdbc/db2 adapter if use_clob_as_blob is false.

= Backwards Compatibility

* The Model.primary_key array for models with composite keys is now
  frozen.

* On DB2, use_clob_as_blob now defaults to false instead of true.

* Sequel no longer uses RubyForge. The Sequel website is now located
  at http://sequel.jeremyevans.net.

Thanks,
Jeremy

* {Website}[http://sequel.jeremyevans.net]
* {Source code}[http://github.com/jeremyevans/sequel]
* {Blog}[http://sequel.heroku.com]
* {Bug tracking}[http://github.com/jeremyevans/sequel/issues]
* {Google group}[http://groups.google.com/group/sequel-talk]
* {RDoc}[http://sequel.jeremyevans.net/rdoc]

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