CHANGES

0.4.9
    * Support for building with msvc 2019
    * Support for mingw gcc 8.1.0
    * Support noexcept for clang 6.0
    * micro_http: use pool of worker threads
    * Support building on Ubuntu 18.04
    * Update Catch to v1.12.0
    * Switch back to sprintf for compatibility
    * Auth: Refactor micro_http a little
    * Auth: refactor HttpMessage; add Syslog support
    * Wrote a .spec file for building RPM

0.4.8
    * Fix broken DomainObj::find(); Fix warnings
    * Fix broken method Property::is_null(); More checks not to dereference NULL pointer
    * Fix possible buffer underrun
    * Sync micro_http with card-proxy
    * Fix problem with removing of non existent backup file 
    * #28: fixing defects found by Coverity Scan
    * #26: do not throw on saving a DataObject twice;
    * check if logger is present in EngineBase
    * #25: fixes for msvc
    * Fix resource exhaustion handling in main loop of micro_http listener.
    * #25: apply aliases for generated SELECT statements
    * #25: generate short mnemonic aliases for tables
    * Move the interlocked connection opening logic from drivers to SqlPool,
      make it optional 
    * #24: do not use placement new/direct destructor calls: gcc5.2.1 bug? 
    * Improve performance of operations with keys: optimized for int IDs
    * micro_http: Support setting back log size on a listening socket
    * Adjust logger format
    * Simplify logic of SqlPool
    * Logger: get/set/check the log level
    * ElementTree: easy access attributes with @ prefix
    * Update micro_http server and TcpSocket wrapper class
    * important: start a transaction on first select if explicit transaction
      is required;
    * pool: reopen a DB connection when got a DB error and no activity seen yet
      on the connection;
    * micro_http: added HttpHeaders class implementation in Auth example;
    * micro_http: analyze Content-Type more correctly;
    * micro_http: allow to set response body with no additional headers.
    * Fix XInclude processing for LibXML2
    * fix broken object construction for explicit joins;
    * rename class ObjectList -> DataObjectList
    * added test for explicit joins
    * do not thow from destructor even if a connection fails to rollback

0.4.7
    * New SQL dialect supported: MSSQL. Tested on Linux (TDS)
      and Windows (Native Client 10).
    * Explicit .select_from<>() and .join<>() modifiers for QueryObj.
    * yborm_gen can be used to manually create schema objects
      in database (--populate-schema) as well as to drop them
      (--drop-schema) in a correct order.
    * yborm_gen tools can help to extract database schema
      and store it into XML format (--extract-schema),
      there are still limited support for type mapping.
    * New layout for SqlDialect descendant classes.
    * Proper support for 'LIKE' and 'IN' operators.
    * Fix comparison of Property instances.
    * Make use of std::tuple if it's available (GCC >= 4.6, MSVC >= 2013).
    * CMake: build-system fixes to allow easy selection of Boost instance.
    * Windows: move third party components (Boost, CppUnit, LibXML2, SQLite)
      into separate folders, pack up prebuilt third party libraries
      for certain versions of MSVC and MinGW.
    * Allow to compile in SQLite3 sources into YB.ORM dll.
    * Fix Automake/CMake scripts to support building YB.ORM with Qt5
      on Linux and Windows.
    * Auth example: Fix possible endless loop in HTTP code.

0.4.6
    * New optional inline syntax for describing the mapping scheme
      within a class declaration, based on macros.
    * Porting tut2 and tut4 examples to the new declaration syntax
      instead of using XML configs.
    * Support .range() pager in queries for different SQL dialects,
      also add .first() filter based on that pager.
    * Updated documantation.
    * Simple constructor for Session that accepts the connection string.
    * It's possible now to construct the Session with a native connection,
      for example soci::session.
    * Logger can be set in Session, no need to explicitly create Engine
      object, in simple cases.
    * Schema object can export its current configuration to XML or SQL.
    * New options object for SQL generation procedure.
    * Many fixes to the build scripts.
    * Auth example: Fix TcpSocket::read*() to use select() and a buffer.

0.4.5
    * New source tree layout: separate public includes from private,
      the library source file names are now in lowercase.
    * Tested to build on Windows with MS Visual Studio 2013.
    * Enable building .dll libraries on Windows by default.
    * Fixed Autoconf/Automake scripts to build on Ubuntu 14.04,
      as well as on FreeBSD 10, Cygwin.
    * Use third party boost.m4 to detect Boost at ./configure stage.
    * Added stuff to make Debian packages.
    * Many little API improvements.
    * Basic means to create indices from schema.
    * Updated tutorials.
    * Auth example: refactor micro_http server.

0.4.0
    * New SQL driver for SOCI library (http://soci.sourceforge.net/).
      If you build with SOCI then you can use connection URL like this:
      "mysql+soci://user=test1 pass=test1_pwd host=localhost service=test1_db" -
      this example shows usage of native MySQL driver, and the following
      one shows usage of ODBC through SOCI -
      "mysql+soci_odbc://DSN=test1_dsn;UID=test1;PWD=test1_pwd".
    * Support for floating point numeric types (Value::FLOAT),
      i.e. float and double in C++.
    * Did some profiling and made significant improvements in speed,
      in particular: fixed input parameter binding; removed excessive use
      of shared pointers, replaced them with intrusive pointers, especially
      where thread-safety makes no sense; now the variant type Yb::Value
      is optimized to make fewer memory allocations.
    * Pre-built packages for Windows now make use of single 
      configuration file bin\yborm_env.bat, this is the place to set PATH
      environment variable and to specify the connection string for
      the test database.
    * Auth sample: TcpSocket::accept() now can return source address of
      incoming connection; fixed exception handing in micro_http.cpp.
    * Tested with Borland C++ Builder 6: kind of works.
      Yes, the compiler is an old piece of crap, I know.
    * NOTE: there is a new field named 'D' in test table 'T_ORM_TEST',
      so you may encounter problems in case you run tests on existing table,
      things can be altered like this (example shown for MySQL):
      mysql> alter table T_ORM_TEST add (D double precision);

0.3.4
    * Implement order-by relationship property.
    * Implement use-list='false' relationship property: useful for one-to-one relation.
    * Add Engine::create_schema(), Engine::drop_schema().
    * Basic JSON serializer from ElementTree.
    * Optimize DataObject and RelationObject structures algorithmically.
    * CodeGen: move Holder typedef into domain class.
    * Fix domain object comparison, allowing to put them in maps and sets.
    * Fix to allow actually use tables without a surrogate key
      and tables with a manually assigned surrogate key.
    * Fixes for better support of tables with compound keys.
    * Fix flushing of new keyed DataObjects.
    * Bunch of fixed typos.

0.3.3
    * refactor Engine classes hierarchy
    * refactor methods Engine::insert(), Engine::update(), Engine::delete()
    * OrderedDict implemented
    * fix finding tables and columns by name, improve speed
    * reproduce bug: Assertion failed in file
      ../../yb-orm/lib/orm/DomainObj.h:288 (!v.is_null())
    * Set fk value on linking if posible
    * Rename Filters -> Expression. Add distinct and for update flags
    * Extended logging for delete_object()
    * Schema generated DDL statements are now iterable
    * Replace method data_object() with get_data_object() in methods find() and insert().
    * Rename some files to follow common style and to better reflect contents.
    * Fixed a bug per request from nbuyvich: chained property references.
    * fix delete_object() to behave properly when deleting a row from a link-table (n-to-n relation).
    * fix yborm_gen: default value setter
    * Fixed a bug per request from nbuyvich: Make it work: pg1->parent->id.is_null()
    * Fixes to build under MacOSX.
    * Add tut4.cpp: tree structure stored in a table. Fixes to make it work.

0.3.2
    * New more intuitive syntax for filters in queries:
      it's done via operator overloading.
    * Domain classes now have static variable 'c' for convenient
      metadata referencing, useful e.g. for filtering.
    * When querying a tuple of Domain classes there will be issued
      a query with join of corresponding tables.
    * Query object now has got methods .one() and .count()
      in addition to old method .all().
    * Added Tutorial3: Querying objects.
    * Fix subtle bug with compiler reordering function calls that leads to
      wrong parameter orders.
    * Fix assertion with re-adding object into session.
    * Fix: Session must always do rollback on releasing Engine.
    * Auth sample: Improve App class, use theApp::instance().new_session()
      for creating sessions.

0.3.1
    * Integrate native SQLITE driver for use in non-QT builds.
      Now this driver is used in Windows examples by default.
      Thanx to Andrey Skobenkov.
    * Improved logging in the ORM core.
    * Support URL for specifying connection thruout the examples
      and the build system.
      Now it's possible to just use --with-test-db-url option
      and YBORM_URL environment variable.
    * Applied patches from Sebastian Lauwers,
      See closed tasks here: http://code.google.com/p/yb-orm/issues
    * Fixed Session::flush_delete(): respect the depth.
    * Fixed Engine::on_delete(): once prepare, many times exec.
    * Cleaned up MetaData classes' interfaces for sake of convenience.
      Now the generated code looks more readable.
    * New class Expression replaced old Filter class.
      This is the first step to develop a comprehensive query language.
    * For convenience added --with-yborm-root to configure script
      in Auth sample.
    * Application singleton for Auth example.

0.3.0
    * New and more convenient method of access to domain object properties:
      via property-proxy accessors, instead of old setters/getters.
      The generated domain class code becomes much cleaner.
      Property accessors are implemented for simple data types,
      as well as for object references and object collections.
      To implement recurrent object references there is DomainHolder class.
      Take a look at ProductGroup class from examples/ex2_schema.xml.
      I.e. all object references are implemented using DomainHolder, and
      therefore they must be dereferenced using arrow (->), not just dot (.).
      This change breaks the backward compatibility of the generated code.
    * The code generator utility itself is named yborm_gen now and
      and is able to produce C++ domain classes as well as SQL DDL statements.
      No more need for xsltproc tool.  See tutorial1 for example.
      Also, internally the code generator has moved to libyborm.
    * Initial support for SQLite3 dialect, via QtSql driver.
    * Construct SqlSource from URL, using simple URL parser.
      See examples below.
      1) In a QT build there are native drivers
          'sqlite+qtsql:///home/vaclav/test1_db'
          'mysql+qtsql://test1:test1_pwd@localhost:3306/test1_db'
         as well as ODBC driver (used by default)
          'mysql+qodbc3://test1:test1_pwd@test1_db'
          or 'mysql://test1:test1_pwd@test1_db'
      2) In a non-QT build there's only one ODBC driver available yet:
          'mysql+odbc://test1:test1_pwd@test1_db'
          or just 'mysql://test1:test1_pwd@test1_db'
      You can pass single environment variable YBORM_URL to Engine instance,
      instead of combination of YBORM_DBTYPE, YBORM_DRIVER, YBORM_DB,
      YBORM_USER, YBORM_PASSWD environment variables.  This is mostly
      useful for testing.

0.2.5
    * The Big Change: now you can build YB.ORM against wxWidgets or QT,
      and use their native data structures.  Boost and LibXml are not required.
      Look at the "configure" script options, please.
      On Windows cmake script is capable of building with QT from Nokia QT SDK.
    * QT build utilizes native QtSqlDriver instead of OdbcDriver.
    * query<>() function now accepts tuples of Domain classes (boost::tuple),
      useful for joining tables.
    * New method Session::commit() = Session::flush() + Engine::commit().
    * Better support for compound foreign keys.
    * Better diagnostics when yborm_gen_domain checks schema structure.
    * Now the only thread that opens and closes all connections when using
      SqlPool is the monitor thread.
    * Propagate exceptions back from the monitor thread in SqlPool to report
      about 'failed to connect' conditions immediately.
    * Rename SqlConnect -> SqlConnection.
    * Introduce SqlCursor: an SqlConnection now may have more
      than one open SqlCursor (and SqlResultSet).
    * Fix Auth example: Fix micro HTTP server in case the client connection is
      closed unexpectedly. Support POST queries, other than
      application/x-www-form-urlencoded.

0.2.4
    Add SqlPool for database connection pooling, thanx to Nikita Buyvich.
    ResultSet is now able to cache all rows, i.e. not necessary lazy.
    Support for two or more distinct relations on the same
    table using different foreign keys.
    Add support for 32bit integer SQL data type in schema.
    Build script for cmake and mingw.
    Support for Postgres dialect.
    Auth example: Allow to register the first user via link like this:
    http://localhost:9090/registration?login=medved&pass=preved&name=Medved&status=0
    Bugs fixed:
    Fix a long lasted bug with misuse of ODBC function SQLBindParameter.

0.2.3
    Simple logger implementation.
    Reimplemented xml Writer classes from scratch (not using libxml2).
    Replaced Xml::Node with more convenient class ElementTree::Element,
    still depending on libxml2, but not exposing any of its internals.
    Auth is a separate demo project contributed by Nikita Buyvich,
    the project is a minimal HTTP server, which implements a toy auth
    ptotocol using XML.  Look in examples/auth.
    Many bugfixes.

0.2.2
    Build in schema pieces into generated classes.
    Update of autogenerated code now works (AUTOGEN sections only).
    Keep smart pointers to Tables and Relations.
    Automatic registration of domain classes at DomainFactory singleton.
    Wide Unicode partial support.
    Start to work on a tutorial.
    Bugs fixed:
    TestDataObject::test_data_object_relink()
    TestDataObjectSaveLoad::test_flush_new_linked_to_existing()
    TestDataObjectSaveLoad::test_lazy_load_fail()

0.2.1
    Row becomes a vector of named values.
    Diffenetiate save() and save_or_update().
    Implement load_collection() using DataObjectResultSet with iterator.
    Three levels of lazy result sets: SqlResultSet, DataObjectResultSet and
    DomainObjectResultSet template class.

0.2.0
    The Big Change: new internal weak-typed row representation DataObject class
    replaces old RowData class.  Session class has been also rewritten from
    scratch.
    This solves old big problems with how object relations are represented and
    who shall be responsible for holding object reference.
    Now deletion (including cascading) works for objects and relations.

0.1.2
    Document XML metadata format, add 'relation' element for relations
        between classes.
    Initial support for backrefs via managed lists, to make one-to-many
        relationships more usable.