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 4.4.0 has been released!
= New Features
* Sequel now supports Sybase SQLAnywhere, via the sqlanywhere and
jdbc/sqlanywhere adapters.
* The filter by associations support now handles cases where the
association has :conditions or a block (as long as the block
does not rely on instance-specific behavior). This allows
you to handle the following:
Album.many_to_many :popular_tags, :class=>:Tag do |ds|
ds.where{tags__popularity > 9000}
end
Album.where(:popular_tags=>[Tag[1], Tag[2]])
This will return all albums whose popular_tags would include
at least one of those two tags. Previously, the block would
be ignored, returning albums containing one those tags even if
the tags weren't popular.
* A table_select plugin has been added that changes the default
selection for models from * to table.*. This is useful for
people who want ActiveRecord-like behavior instead of SQL-like
behavior, where joining tables doesn't automatically include
columns in the other table.
This can fix issues where joining another table that has columns
with the same name as columns in the model table without
specifying an explicit selection results in model objects being
returned where the values in the model object are the values
from the joined table instead of the model table.
* Dataset#offset has been added, for specifying offset separately
from limit. Previous this was possible via:
ds.limit(nil, offset)
but this is a friendlier API.
* The jdbc adapter now has support for foreign key parsing. This
is used if there is no specific support for the underlying
database.
* Foreign key parsing is now supported on Oracle.
= Other Improvements
* Association add_*/remove_*/remove_all_* methods for
pg_array_to_many associations now work on unsaved model objects.
* In the constraint_validations extension, deletes from the
metadata table are now processed before inserts, so that dropping
an existing constraint and readding a constraint with the same
name now works correctly.
* Cloning an association now copies the :eager_block option
correctly from the source association if it was passed as
the block to the source association method.
* Cloning a cloned association now copies the block for the
association.
* The descendants method in the tree plugin no longer modifies an
array it is iterating over.
* The jdbc/postgresql adapter now supports PostgreSQL-specific types,
with pretty much the same support as the postgres adapter. When
using the pg_* extensions, the dataset will now handle the
PostgreSQL types correctly and return instances of the correct
Ruby classes (e.g. hstore is returned as Sequel::Postgres::HStore).
You should no longer need to use the typecast_on_load or
pg_typecast_on_load plugins when using model objects that use these
types when using the jdbc/postgresql adapter.
* Offset emulation on Oracle now handles cases where selected
columns can't be ordered.
* Offset emulation on DB2 no longer automatically orders on all
columns if the dataset itself is unordered.
* Types containing spaces are now returning correctly when
parsing the schema in the oracle adapter.
* Database#tables no longer returns tables in the recycle bin on
Oracle.
* add_foreign_key now works correctly on HSQLDB, by splitting the
column addition and constraint addition into two separate
statements.
* add_primary_key now works correctly on H2.
Thanks,
Jeremy
* {Website}[http://sequel.rubyforge.org]
* {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.rubyforge.org/rdoc]
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