[odb-announcements] ODB 1.6.0 released

Tue Oct 4 03:59:34 EDT 2011

Hi,

We have released ODB 1.6.0. The NEWS file entries for this release are
as follows:

  * New concept, view, is a C++ class that embodies a light-weight, read-
    only projection of one or more persistent objects or database tables
    or the result of a native SQL query execution. Some of the common
    applications of views include loading a subset of data members from
    objects or columns from database tables, executing and handling
    results of arbitrary SQL queries, including aggregate queries, as
    well as joining multiple objects and/or database tables using object
    relationships or custom join conditions. For more information refer
    to Chapter 9, "Views" in the ODB manual as well as the 'view' example
    in the odb-examples package.

  * New function, database::erase_query(), allows the deletion of the
    database state of multiple objects matching certain criteria. It uses
    the same query expression as the database::query() function. For more
    information, refer to Section 3.10, "Deleting Persistent Objects" in
    the ODB manual.

  * Support for value wrappers. An ODB value wrapper is a class template
    that wraps a value type or a container. Common examples of wrappers
    are smart pointers, holders, and "optional value" containers such as
    boost::optional. A wrapper can be transparent or it can handle the
    NULL semantics. To allow the easy conversion of value types that do
    not support the NULL semantics into the ones that do, the odb::nullable
    class template has been added. ODB now also includes built-in support for
    std::auto_ptr and std::tr1::shared_ptr smart pointers as value wrappers
    as well as for boost::shared_ptr and QSharedPointer via the Boost and Qt
    profiles. Currently, the NULL semantics is only supported for simple
    values but smart pointers can still be used with composite values and
    containers. For more information, refer to Section 7.3, "NULL Value
    Semantics" in the ODB manual.

  * Support for the boost::optional container in the Boost profile. A data
    member of the boost::optional type is mapped to a column that can have
    a NULL value. For more information, refer to Section 15.3 "Optional
    Library" in the ODB manual.

  * Support for mapping std::vector<char> to the BLOB (or equivalent) types.
    For more information, refer to Chapters 11 (for MySQL), 12 (for SQLite)
    and 13 (for PostgreSQL) in the ODB manual.

  * New option, --table-prefix, allows the specification of a prefix that
    is added to table and index names. For more information, refer to the
    ODB compiler command line interface documentation (man pages).

  * New ODB runtime library interface, odb::connection, represents a
    connection to the database. The primary use case for a connection is to
    execute native statements outside of a transaction. For more information,
    refer to Section 3.5, "Connections" in the ODB manual.

  * Support for multiplexing several transactions on the same thread. For
    more information, refer to Section 3.4, "Transactions" in the ODB
    manual.

  * All the concrete connection classes now have a second constructor which
    allows the creation of a connection instance from an already established
    underlying connection handle. The connection_pool_factory and, in case of
    SQLite, single_connection_factory now have a virtual create() function
    that can be overridden to implement custom connection establishment and
    configuration.

  * The query expression syntax for object pointers and composite values has
    changed. Now, instead of using the scope resolution operator ('::'), the
    member access via a pointer operator (->) is used for object pointers and
    the member access operator (.) is used for composite values. Examples of
    old and new syntax for pointers, old: query<employee>::employer::name,
    new: query<employee>::employer->name. For composites values, old:
    query<employee>::name::first, new: query<employee>::name.first.

  * SQLite ODB runtime now enables foreign key constraints checking by
    default. While this should not affect correct applications, due to
    bugs in SQLite DDL foreign keys support, you may need to temporarily
    disable foreign key constraints checking when re-creating the database
    schema (the sign that you may need to do so is the "foreign key
    constraint failed" exception thrown by the commit() function after the
    call to schema_catalog::create_schema()). For more information, refer
    to Section 12.5.3, "Foreign Key Constraints" in the ODB manual.

  * Support for specifying the client character set for the MySQL database.
    For more information, refer to Section 11.2, "MySQL Database Class" in
    the ODB manual.

  * Object cache maintained by a session no longer distinguishes between
    const and non-const objects. Instead, const objects are treated as
    non-const by casting away constness. For more information on this new
    behavior, refer to Section 9.1, "Object Cache" in the ODB manual.

This version has also been tested with the recently released PostgreSQL 9.1.

We would like to thank everyone who reported bugs, shared test results, or
helped test one of the alpha releases.

Source code and pre-compiled binary packages for this release are available
from the ODB download page:

http://www.codesynthesis.com/products/odb/download.xhtml

SHA1 checksums for the files in this release are as follows:

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Enjoy,
	Boris