[odb-announcements] ODB 2.2.0.a3 available

[Boris Kolpackov]

Hi,

The third alpha version for the upcoming ODB 2.2.0 is now available. The
NEWS file entries so far are listed below. It also includes a large
number of other minor improvements and bug-fixes.

 * Multi-database support. It allows an application to simultaneously work
   with multiple database systems and comes in two flavors: static and
   dynamic. With static support the application uses the static database
   interfaces (that is, odb::<db>::database instead of odb::database). With
   dynamic support the same application code can access multiple databases
   via a common interface. Dynamic multi-database supports also allows the
   application to dynamically load the database support code for individual
   databases if and when necessary. For more information, refer to Chapter
   13, "Multi-Database Support" in the ODB manual.

 * Support for prepared queries. Prepared queries are a thin wrapper around
   the underlying database system's prepared statements functionality. They
   provide a way to perform potentially expensive query preparations tasks
   only once and then executing the query multiple time. For more information,
   refer to Section 4.5, "Prepared Queries" in the ODB manual as well as the
   'prepared' example in the odb-examples package.

 * Support for automatically-derived SQL name (table, column, index, etc.)
   transformations. At the higher level, it is possible to assign prefixes
   and suffixes (--table-prefix, --{index,fkey,sequence}--suffix options)
   as well as to convert to upper or lower case (--sql-name-case option).
   At the lower level, it is possible to specify transformations as regular
   expressions (--{table,column,index,fkey,sequence,sql-name}-regex options).
   For more information, refer to the SQL NAME TRANSFORMATIONS section in
   the ODB compiler command line interface documentation (man pages).

 * New options, --export-symbol and --extern-symbol, allow DLL exporting of
   the generated database support code.

 * Support for early connection release. Now the database connection is
   released when commit()/rollback() is called rather than when the
   transaction instance goes out of scope.

 * Support for SQL Server ROWVERSION-based optimistic concurrency. For more
   information, refer to Section 18.1.1, "ROWVERSION Support" in the ODB
   manual.

 * Support for specifying SQL Server transaction isolation level. For more
   information, refer to Section 18.2, "SQL Server Database Class" in the
   ODB manual.

This pre-release is available from:

http://www.codesynthesis.com/download/odb/pre-release/

The SHA1 sums for all the files in this pre-release are provided at the
end of the email.

Testing and feedback are much appreciated.

Enjoy,
	Boris

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