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Bump version to 3.41.0

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1 parent 79bd0c4 commit a08763d510b47ebf6a124c35fc49ad816972e310 @jeremyevans committed Nov 1, 2012
Showing with 157 additions and 2 deletions.
  1. +1 −1 CHANGELOG
  2. +155 −0 doc/release_notes/3.41.0.txt
  3. +1 −1 lib/sequel/version.rb
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@@ -1,4 +1,4 @@
-=== HEAD
+=== 3.41.0 (2012-11-01)
* Add bin/sequel usage guide (jeremyevans)
@@ -0,0 +1,155 @@
+= New Features
+
+* A connection_validator extension has been added, which
+ automatically determines if connections checked out from the pool
+ are still valid. If they are not valid, the connection is
+ disconnected and another connection is used automatically,
+ transparent to user code.
+
+ Checking if connections are valid requires a query, so this
+ extension causes a performance hit. For that reason, connections
+ are only checked by default if they have been inactive for more than
+ a configured amount of time (1 hour by default). You can choose to
+ validate connections on every checkout via:
+
+ DB.pool.connection_validation_timeout = -1
+
+ However, this can cause a substantial performance hit unless you are
+ purposely using coarse connection checkouts via manual calls to
+ Database#synchronize (for example, in a Rack middleware). Using
+ coarse checkouts can greatly reduce the amount of concurrency that
+ Sequel supports (for example, limiting the number of concurrent
+ requests to the number of database connections), so this method is
+ not without its tradeoffs.
+
+* Sequel.delay has been added for a generic form of delayed
+ evaluation. This method takes a block and delays evaluating it
+ until query literalization. By default, Sequel evaluates most
+ arguments immediately:
+
+ foo = 1
+ ds = DB[:bar].where(:baz=>foo)
+ # SELECT * FROM bar WHERE (baz = 1)
+ foo = 2
+ ds
+ # SELECT * FROM bar WHERE (baz = 1)
+
+ Using Sequel.delay, you can delay the evaluation:
+
+ foo = 1
+ ds = DB[:bar].where(:baz=>Sequel.delay{foo})
+ # SELECT * FROM bar WHERE (baz = 1)
+ foo = 2
+ ds
+ # SELECT * FROM bar WHERE (baz = 2)
+
+* Sequel now supports the :unlogged option when creating tables on
+ PostgreSQL, to create an UNLOGGED table.
+
+* On SQLite, Database#transaction now supports a :mode option for
+ setting up IMMEDIATE/EXCLUSIVE SQLite transactions. Sequel also
+ supports a Database#transaction_mode accessor for setting the
+ default transaction mode on SQLite.
+
+* Most pg_* extension objects (e.g. PGArray) now support the #as
+ method for creating an SQL::AliasedExpression object.
+
+* The single_table_inheritance plugin now supports non-bijective
+ mappings. In lay terms, this means that a one-to-one mapping
+ of column values to classes is no longer required. You can now
+ have multiple column values that map to a single class in the
+ :model_map option, and specify a :key_chooser option to choose
+ which column value to use for the given model class.
+
+* The touch plugin now handles the touching of many_to_many
+ associations, and other associations that use joined datasets.
+
+* ConnectionPool#pool_type has been added. It returns a symbol
+ representing the type of connection pool in use (similar to
+ Database#database_type).
+
+* Database#valid_connection? has been added for checking if a given
+ connection is still valid.
+
+* Database#disconnect_connection is now part of the public API, and
+ can be used to disconnect a given connection.
+
+= Other Improvements
+
+* Uniqueness validation now correctly handles nil values.
+ Previously, it checked the underlying table for other rows where
+ the column IS NULL, but that is incorrect behavior. Sequel's new
+ (correct) behavior is to skip the uniqueness check if the column
+ is nil.
+
+* Foreign key parsing is now supported on Microsoft SQL Server.
+
+* Dataset#reverse and #reverse_order now accept virtual row blocks.
+
+* Changing the name of the primary key column, and possibly other
+ schema changes on the primary key column, are now supported on
+ MySQL.
+
+* Primary key columns are now specifically marked as NOT NULL on
+ SQLite, as non-integer primary keys on SQLite are not considered
+ NOT NULL by default.
+
+* Failure to create a native prepared statement is now handled
+ better in the postgres, mysql, and mysql2 adapters.
+
+* Firebird now emulates selecting data without an underlying table
+ (e.g. DB.get(1)).
+
+* Finding the name of the constraint that sets column defaults on
+ Microsoft SQL Server now works correctly on JRuby 1.7.
+
+* An additional type of disconnect error is now recognized in the
+ jdbc/sqlserver adapter.
+
+* Many adapters have been fixed so that they don't raise an exception
+ if trying to disconnect an already disconnected connection.
+
+* Many adapters have been fixed so that
+ Database#log_connection_execute logs and executes the given SQL
+ on the connection.
+
+* Many adapters have been fixed so that
+ Database#database_error_classes returns an array of database
+ exception classes for that adapter.
+
+* Database#log_exception now handles a nil exception message.
+
+* Dataset#limit(nil, nil) now resets offset in addition to limit, but
+ you should still use Dataset#unlimited instead.
+
+* A bin/sequel usage quide has been added to the documentation.
+
+= Backwards Compatibility
+
+* Sequel now treats clob columns as strings instead of blobs
+ (except on DB2 when use_clob_as_blob = true). This can make it
+ so the values are returned as strings instead of SQL::Blob values.
+ Since SQL::Blob is a String subclass, this generally will
+ not affect user code unless you are passing the values as input
+ to a separate blob column.
+
+* The Database <-> ConnectionPool interface was completely changed.
+ Sequel no longer supports custom connection procs or disconnection
+ procs in the connection pools. The :disconnection_proc Database
+ option is no longer respected, and blocks passed to Database.new
+ are now ignored.
+
+ This change should not be user-visible, but if you had any code
+ that was monkeying with the connection pool internals, you may
+ need to modify it.
+
+* Code that was using the uniqueness check to also check for presence
+ should add a separate check for presence. Such code was broken,
+ as it only worked if there was already a NULL column value in the
+ table. If you were relying on this broken behavior, you should
+ clean up the NULL data in the column and then mark the database
+ column as NOT NULL.
+
+* If you have code that specifically abuses the fact that non-integer
+ primary keys on SQLite allow NULL values by default, it will no
+ longer work.
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@@ -3,7 +3,7 @@ module Sequel
MAJOR = 3
# The minor version of Sequel. Bumped for every non-patch level
# release, generally around once a month.
- MINOR = 40
+ MINOR = 41
# The tiny version of Sequel. Usually 0, only bumped for bugfix
# releases that fix regressions from previous versions.
TINY = 0

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