[ANN] Cayenne 1.0.2 released

From: Andrus Adamchik (andru..bjectstyle.org)
Date: Mon Oct 27 2003 - 17:22:47 EST

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    1.0.2 bugfix release of Cayenne is now available:

         http://objectstyle.org/cayenne/

    It includes all the patches discussed on cayenne-user in the past
    weeks. I removed the intermediate patched versions from the
    objectstyle.org server. A few highlights from the release notes:

    1. Fixes formatting of negative byte values by QueryLogger. Note that
    the final version is improved compared to the intermediate patches,
    using the algorithm similar to the one implemented in
    Integer.toHexString().

    2. Implements a workaround for certain JDBC driver-level problems in
    handling java.lang.Short. Affected drivers are Oracle 9.1 driver for
    Mac OS X and Sybase jConnect

    3. Support for binary PKs:
           - Fixes ObjectId.hashCode() and ObjectId.equals() to work with
    binary primary keys.
           - Implements a transparent client-side binary PK generator.

    4. Fixes translating "parent qualifier" of SelectQuery (used in queries
    with derived entities).

    5. Fixes SQL generated by Postgres and Firebird adapters for CREATE
    TABLE. Original problem was that binary types ("bytea" on Postgres and
    "blob sub_type 0" on Firebird) were assigned max. length, that is not
    supported on the target database.

    A few words on binary PKs. If a primary key column in the database is
    BINARY or VARBINARY, Cayenne will automatically generate a byte[] value
    when an object is inserted to the database. The size of the byte[] will
    be equal to the max. length specified in the mapping for the column.
    Generated byte[] is a pseudo-GUID (globally unique id). It is "pseudo"
    since Java does not provide facilities to create a real GUID (there are
    some native libraries that do that if anyone cares; I believe Holger
    posted a link on cayenne-devel some time back). Also I would not rush
    switching all your existing entities to use a binary key. Whatever
    little time it saves during PK generation by not going to the database
    (not much really, considering how Cayenne caches PK sequences), will be
    too small compared to the inefficiency during subsequent selects (and
    of course it'll take more disk space in the DB). But of course some
    have to deal with existing systems implemented using binary PKs. This
    is where such feature is useful.

    Enjoy!
    Andrus



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