UPDATES.TXT



This file contains a description of modifications made to CDB For
Windows since its inception.


Version 0.90    (released 04/22/91)
============

- Initial release.


Version 0.91    (released 05/06/91)
============

- The documentation has been enhanced.

- The sample source files have been modified to support the Zortech
  C/C++ compiler.  Zortech C/C++ does not have a memory.h header file.

- Internal key pages were modified to be non write-through.  Before
  this modification, all CDB database calls would flush modified
  pages to disk before returning to the calling function.  This
  change will greatly enhance the speed at which database records
  can be added, modified and deleted.  To ensure that data is written
  to disk, call the DbFlush function.  This function has been modified
  to write all 'dirty' pages to disk.

- The DBSERVER.EXE 'cdb' function, a common entry point for all cdb
  calls, has been modified to be ANSI C compatible.  This function
  takes a variable number of arguments.  The argument list is now being
  retrieved via the 'va_start', 'va_arg' ANSI C function calls.


Version 0.92    (released 05/16/91)
============

- The documentation has been enhanced.

- The dbtalk library source files and the sample program source files
  have been modified to support the Borland C++ v2.0 compiler.  The
  dbtalk libraries included have been compiled with Microsoft C but
  are compatible with Borland & Zortech C++.


Version 1.00    (released 06/26/91)
============

- The documentation has been enhanced.

- Converted DBTALK library to a DLL.

- Changed DbOpen database HANDLE parameter (hDb) to LPHANDLE.  See
  documentation.

- Added DbGetNbrClients function call.  This function returns the
  number of applications that have opened a particular database.

- Added file locking capabilities.  More than one application can
  access the same database concurrently.  New functions added include;
  DbFileLock, DbFileUnlock, and DbFileGetLockStatus.  This feature does
  not provide LAN access capabilities.  Multiple applications running
  under Windows on a single CPU can access a database concurrently.

- Modified the database server (DBSERVER.EXE) to be displayed as an
  icon.

- Fixed problem with DDLP.EXE.  DDLP would not accept a type double
  declared as an array.  Example: double test[8];


Version 1.01    (released 9/16/91)
============

- Created a WINHELP compatible CDBW help file.  This replaces
  CDBW.WRI.

- Modified DbOpen function.  Added a hide parameter.  This parameter
  is set to TRUE if you wish to hide the DbServer icon.  See the
  documentation for more info.

- Modified the WEP() DBTALK.DLL function to close all open
  DBSERVER's if the DLL is being removed from memory.

- Modified DbRecordDelete function to check for 'records owning' or
  'records owned by' the record about to be deleted.  If either of
  the forementioned exist, an error is returned.  E_HASOWNER and
  E_HASMEMBER respectively.

- Modified DBSERVER.C to handle the WM_CLOSE message.  If a WM_CLOSE
  message is received and an application has the database open (most
  likely a UAE occured and the database was left open), the database
  is closed.

- Modified DDLP (Data Defintion Language Parser) to create Visual
  Basic compatible header files.  Use the -vb flag.  It will create
  a .TXT file instead of a .H file when this flag is used.


Version 1.02    (released 10/18/91)
============

- Fixed bug with DbRecordGetCurrent and XDbRecordGetCurrent.  A UAE
  would occur occasionally during these function calls because of a
  bad parameter passed.

- Fixed bug with DbRecordGetByKey and XDbRecordGetByKey.  When
  an E_NEXTGUESS value was returned, the target structure passed
  did not contain the 'Next Guess' record.


Version 1.03    (released 11/04/91)
============

- Fixed bug with DbFlush function call.  The DbFlush function closes
  all open files and then proceeds to reopen them.  The path used
  for reopening was invalid.  This problem would mostly occur with
  PREFIX's (in the DDL file) declared with greater than 3 characters.

- Fixed bug in internal page flushing.  When a handle in the LRU
  table was closed, the associated pages with this handle were not
  being flushed to disk.  This problem would only be visible if
  you had a large number of record types declared in the DDL.