Change Log for DBD::Informix for DBI

- Written by Alligator Descartes <descarte@arcana.co.uk>
- Rewritten by Jonathan Leffler <johnl@informix.com>

0.57 Release
------------
97-10-19: Handle the 'esql -libs' process rather differently, because of
          the bug in older versions of the esql script which do not echo
          the name of the netstub library when necessary (a problem found
          by Rodger Anderson <rodger@hpbs2245.boi.hp.com> in July, but only
          now resolved).  Record information about compiling with c4gl only
          in Informix.Licence, after answering questions from Paul Falbe
          <paul@cassens.com>.
97-10-08: Change the name of the sqlca element of imp_dbh to ix_sqlca to
          avoid the macro renaming used in threaded versions of ESQL/C such
          as on Windows 95 and Windows NT.  This change and success with a
          Windows 95 and Windows NT port reported by Harald Ums
          <Harald.Ums@sevensys.de>.  Also a change to esqlc.h, triggered by
          the need to use sqlproto.h, and use io.h in place of unistd.h in
          ixblob.ec, and do not release 'unreleased' blobs...  Makefile.PL
          still to be upgraded.
97-10-08: Record Informix ESQL/C's ability to change the environment
          without Perl knowing about it, after the problem found by Jay
          Ludoviconi <jludovic@paging.mot.com> was tracked down.
97-10-03: Add Working.Versions file after a suggestion by Nuno Carneiro de
          Moura <ncmoura@net.mailcom.pt>
97-08-13: Add file hints/static.build with info about building statically
          linked Perl executables from Kent S Gordon <kgor@inetspace.com>.
          Clean up function entry and exit reporting.
97-08-01: Add _tables and _columns metadata methods.
97-07-29: Update to use the templates from DBI v0.89, etc.  Amend README
          after Kent S Gordon <kgor@inetspace.com> noted that the engine
          version information could be useful.
97-07-21: Add dbd_ix_preparse() (based on code in DBD::ODBC 0.15) to
          pre-process an SQL statement, replacing Oracle-style :x notation
          with question mark place holders.  This allows DBD::Informix to
          support $sth->{NUM_PARAMS} properly, and reinstates functionality
          present in DBD::Informix 0.24 but summarily removed in version
          0.25.  Interestingly, of course, noone has complained, or even
          commented on this.
97-07-16: Kenji Hino <kenji@alcatraz.net> found that the test t/blob02.t
          failed for logged OnLine databases because of the changed
          AutoCommit handling; alter the criterion for doing $dbh->commit.
          Jason Bodnar <jcbodnar@mail.utexas.edu> found that the
          documentation for $dbh->do() was faulty; add the undef parameter
          for the unused \%attr documented by DBI.
97-07-14: Deal with the last of the deprecated attributes.  Work around the
          oddities (changes) introduced by ESQL/C 9.12.

0.56 Release
------------
97-07-10: Final clean up and testing (and workaround for problem in DBI
          0.85 when connections fail at connect time).
          Version 0.56 released.
97-07-09: Establish that DBI->connect(...,{AutoCommit=>0}) does not set the
          AutoCommit attribute until after the basic connect operation is
          complete.  DBD::Informix therefore cannot reject connections on
          unlogged databases in the basic connect operation.  Modified
          Informix.Licence after Raj Goel <frostbit@brainlink.com> needed
          to ask questions.  The difficulty with 'newbies' is that they
          quickly cease to be newbies so you need a continuous supply of
          new newbies.  Fix documentation in Informix.pm for AutoCommit,
          and behaviour of ix_InTransaction attribute.  Many thanks to Hank
          Robinson <cudau@csv.warwick.ac.uk> for his help clarifying the
          required behaviour of AutoCommit, and apologies for omitting his
          name in the original version of the 0.56 release notes.
97-07-08: Make $dbh->{ix_AutoErrorReport} a synonym for $h->{PrintError}.
97-07-07: Jason Bodnar <jcbodnar@mail.utexas.edu> pointed out that
          $sth->execute() is not returning undef when an error occurs.
97-06-25: Roderich Schupp <roderich@nodebonn.muc.bmw.de> found a similar
          problem using $dbh->do($stmt, undef, $arg1, $arg2), core dumping
          in the link code.  This could be reproduced with the as-released
          0.55 DBD::Informix but appears to be fixed, presumably by the fix
          for Fred's problem.  Also, ensure the t/dbase.t unsets both
          $ENV{DBI_DSN} and $ENV{DBI_DBNAME} to allow the implicit connect
          test to work (deduced from test output sent by Fred Arnold).
          Move comments about Solaris compiler into new file hints/solaris.
          Move README.M88K.SVR4 to hints/M88K.SVR4.
97-06-24: Found problems in DBI 0.84 where PrintError, RaiseError, ChopBlanks
          as handled by DBI cannot be unset -- Tim confirmed it is a bug in
          DBI and will be fixed in the next release.
97-06-23: Core dump problem found by Fred Arnold <ftarnol@uswest.com> in the
          code in link.c and the way it is used.  One part of the problem
          was that the IMPSET flag for a statement was not being set soon
          enough, so that DBI was not releasing the statement from the
          linked lists correctly.  The temporary fix includes a bodge that
          converts the deleted link into a single item linked list, so that
          when it is released again, it doesn't screw things up.  This
          needs to be cleaned up.  A 0.56a1 release was sent to Fred to get
          him over the immediate problem.
97-06-17: Jason Bodnar <jcbodnar@mail.utexas.edu> pointed out that BEGIN
          WORK is not being recognized via $dbh->do().  Testing showed a
          problem during disconnect on 7.1x servers (related to the B42204
          problem fixed on 97-05-30).  Fixing the disconnect was relatively
          simple.  Fixing the BEGIN WORK issues required the removal of the
          custom implementation of $dbh->do(), and some other changes.
97-06-13: Where there's one bug, there are usually others.  The other array
          attributes for statements (such as $sth->{NAME}) were not being
          mortalized and could be made to eat up memory if used inside an
          inner loop.  Upgrade non-distributed test bug001.t to catch these
          leaks too.
97-06-12: Fix trailing blanks on $sth->{NAME} attributes after problem
          reported by Roderich Schupp <roderich@nodebonn.muc.bmw.de>.  Also
          fix t/chopblanks.t not to create VARCHAR columns in SE.
97-05-30: Fix memory leak when using the $sth->{ix_sqlerrd} and
          $sth->{ix_sqlwarn} attributes repeatedly, reported by Oyvind
          Gjerstad <ogj@tglobe1.tollpost.no>.  The arrays in newSqlerrd()
          and newSqlwarn() were not being mortalized as they should be.
97-05-30: Only set -Ae on HP-UX when using cc, as reported by Nathan
          Neulinger <nneul@umr.edu> who was using gcc.  Also find and
          implement the CLOSE DATABASE workaround for bugs B42204 and
          B64926 which lead to -1800 errors when a 7.x ESQL/C application
          is talking to a 5.0x engine, also reported by Nathan.
97-05-29: Add support for $sth->rows and add simple test.
97-05-26: Add support for DBI->DataSources from DBI v0.82.  Update required
          software accordingly.
97-05-23: Fix Makefile.PL to recognize $INFORMIXDIR/bin at end of PATH,
          thanks to Paul Kulchenko <paul@mega.donetsk.ua>.
97-05-20: Change the handling of deprecated attributes per Informix.pm.
          Fix esqltest.ec when the same MODE ANSI database is used for both
          connections (thanks to Kent S Gordon <kgor@inetspace.com> for
          reporting this).

0.55 Bug-Fix Release
--------------------
97-05-20: ESQL/C Version 5.0x testing previously inadequate, and SQLSTATE
          does not exist in 5.0x, sothe compilation fails.  Also fixed the
          core dumps from t/nulls01.t and t/nulls02.t (nasty workaround)
          and the failure message in t/dbase.t.  Tested with 5.06.UC1,
          6.00.UE1, 7.22.UC2 and 9.10.UC2 on Sun Sparc 20 running Solaris
          2.5.1, using 2 Perl configurations: Perl 5.003 with GCC 2.7.2.2
          and Perl 5.004 with SUNWspro C Compiler SC3.0.1 -- all OK.
          Version 0.55 released.
97-05-19: Change the handling of deprecated attributes per Informix.pm.

0.54 Release
------------
97-05-16: Another major rework on Informix.Licence to make the requirements
          clearer to people with minimal exposure to Informix, after Honza
          Pazdziora <adelton@fi.muni.cz> had some problems with it.  Add
          notes from Anibal Jodorcovsky <anibal@nortel.ca> about
          compilation on Motorola M88K SVR4 machines in README.M88K.SVR4.
          Version 0.54 released.
97-05-15: ChopBlanks code added and tested.  VARCHAR was bad!  Statement
          level ChopBlanks attribute not tested (probably not operational;
          attribute probably remains as it was when the statement was
          prepared).
97-05-13: Finish adding driver fetch function, and consequential changes.
          SQLSTATE now available via DBI::state!
97-05-05: Revise ixblob.ec to use ixblob.h and transfer to general library.
          Eliminate BLOB_DUMMY_VALUE and BLOB_NULL_VALUE (can't think what
          they were to be used for!).  Consequential changes.
97-04-24: Add fix in Makefile.PL for DEC OSF/1 and ESQL/C 7.22 from Andrew
          Hunt <andy@toolshed.com>.  Reverse order of updates in ChangeLog.
          DEC OSF/1 changes also reported later by Debbie Ingram
          <djingram@mindspring.com>.
97-04-08: Add attribute $sth->{ix_Fetchable} to determine whether the
          statement needs data fetching or not.  Add this to sqlcmd.sh, which
          enables basic simulation of the full SQLCMD program.  Still need
          better Getopt module which allows for multiple occurrences of a
          single option on the command line (eg: multiple -e or -f options).
          Also need better handling of filenames versus commands in the rest
          of the arguments.  Note that the build process does not (yet) do
          anything with the source code of sqlcmd.sh.
97-04-01: Add '-Ae' for HP-UX unless $Config{ccflags} includes -Aa or -Ae,
          per information from Oyvind Gjerstad <ogj@tglobe1.tollpost.no>.
          Include $Config{ccflags} in the command line when building the
          ESQL/C test program.
97-03-28: Correct the handling of $dbase2 in multiple connections tests when
          DBD_INFORMIX_DATABASE2 is not set.  Fix required after John C
          Hossfeld <john@netpub.com> had problems.  Also report which database
          is being connected to!  Problem (and solution) also subsequently
          reported by James F Miner <jfm@winternet.com>.
97-03-26: Add ODBC type handling.
97-03-20: Update Makefile.PL to handle relocated DBIXS.h header, again.
97-03-18: Change the handling of deprecated attributes per Informix.PM.

0.53 Release
------------
97-03-06: Change the handling of deprecated attributes per Informix.PM.
          Update the README file to spell out the pre-requisites better.
          Update Makefile.PL with 0.53a1 version number, and so that it
          insists that $INFORMIXDIR is set, and that $INFORMIXDIR/bin is in
          $PATH.  Update tests to use the non-deprecated attributes.  Add the
          test program esqltest.ec to check that the ESQL/C environment is OK
          before creating the Makefile.
97-03-10: No changes over the weekend - the skiing at Squaw was fabulous!
          Update the POD to encourage the use of DBI->connect() in preference
          to $drh = DBI->install_driver().  Add two new, but fore-shadowed,
          driver attributes, ix_CurrentConnection and ix_ActiveConnections,
          though they're currently only set when the driver is loaded.
97-03-17: Update Informix.Licence to contain more comprehensive information
          on licencing and Netscape's LiveWire Pro.  Update t/updcursor.t so
          it passes on a logged (non-MODE ANSI) database.  Fix the problem
          with nulls found by Oyvind Gjerstad <ogj@tglobe1.tollpost.no> and
          now immortalized in the test case t/nulls02.t.  Change version to
          0.53 and release.

0.52 Release
------------
97-03-05: Add ESQL/C => DBD::Informix statement mapping to POD in Informix.PM,
          after suggestion by Bill Mitlyng <Bill.Mitlyng@abnamro.com>.
97-03-03: Use $DBI::VERSION to determine where DBIXS.h should be found.
97-03-02: Split attribute handling code from dbdimp.ec into dbdattr.ec.
          Add dbd_ix_module() function.  Revise the interface to the functions
          dbd_st_{FETCH|STORE} to match dbd_db_{FETCH|STORE} (they now take a
          pointer to imp_sth_t argument instead of a pointer to SV).
97-02-28: Add the Informix.Licence file to explain the licencing issues for
          Informix-ESQL/C.  Update the README file.  Fix the caching of
          attributes.  Add 'deprecated' warning to the system, and a way of
          turning the deprecated warnings off.  Use this method in
          InformixTest.pm.  Add the attribute handling of ix_XyZ as well as
          deprecating the corresponding XyZ attribute.  Fix the handling of
          SQLCA so that the inserted serial number is available, etc.  Version
          bumped to 0.52.

0.51 Release
------------
97-02-26: Add $sth->{CursorName} and $dbh->{ConnectionName}.  Add test
          updcursor.t to check that you can do 'UPDATE ... WHERE CURRENT OF'.
          Add ".DEFAULT." as an explicit way of making the default connection.
          Release version 0.51, and a patch, version 0.51p1.
97-02-25: Version bumped to 0.51.  Nulls on SELECT handled correctly.  Test
          nulls01.t added.  Notes on access to the SQLCA record added to the
          POD in Informix.PM, after this omission was noted by Torsten Stein
          <stein@cls.de>.
97-01-23: Fix InformixTest.pm so it works with perldoc.  It seems that perldoc
          does not like lines which start with a single quote.  Thanks to
          Jason Bodnar <jcbodnar@mail.utexas.edu> for pointing this problem
          out. Add and use stmt_err to report errors or warnings, and document
          it.

0.50 Release
------------
97-02-13: Version 0.50 released.  Handle null database names on connect so
          that CREATE DATABASE, etc, can be used.  ESQL/C 5.0x has to handle
          this by doing nothing (successfully) in dbd_ix_database(), but the
          disconnect code needs to know that there is no database so it
          doesn't try to close the current database.  This requires interface
          changes for dbd_ix_database() and dbd_ix_connect().  Add testing.
          Thanks to Serge Davidov <serge@fcmc.com> for finding the problem.
          You can also use DBI->connect('@server','','','Informix'), which
          actually worked in v0.25.  DBD::Informix is still confused, in
          general, by statements such as CLOSE DATABASE.
97-01-12: Version bumped to 0.50p1, for consistency with documented intentions
          when 0.25 release was made.

0.26 Release
------------
97-01-12: Use cursors WITH HOLD when a MODE ANSI database is working with
          AutoCommit set On.  Make transaction tests more sensitive.
          This release never made public.
97-01-09: Updated copyright messages.  Improved documentation.  Fixed tests.
          Add $dbh->{InTransaction} query.  Clean up dbdimp.ec so that
          AutoCommit works better. Etc.  Version 0.26a2.
96-12-20: Get transaction stuff to work, more or less, with AutoCommit On or
          Off, in MODE ANSI or Logged databases.  Tests t/transact0[123].t
          added, but these still need to be more formally verified.  They
          pass with OnLine and any type of database.  Clean up various tests
          so that they pass on MODE ANSI databases.  Add select_some_data
          and select_zero_data functions to InformixTest.pm. Etc.  Version
          0.26a1.  Use bug-fixed version of decsci.c (ouch!).
96-12-19: Add install instructions to README file after Wes Gamble
          <wgamble@informix.com> pointed out this omission.  Add extensive
          notes to Informix.PM on transaction management.  Implement most
          of what those notes say (WITH HOLD cursors omitted at the
          moment).
96-12-18: Fix bug in patched Makefile.PL (need space before __H_LOCALEDEF).
          Updated dbd_ix_setconnection() to take connection information, and
          updated code in dbdimp.ec to ensure that the correct connection is
          set before starting work.  Simple testing more or less works.  Some
          more major revisions, such as not passing SV* to most of the code in
          dbdimp.ec (let the Informix.c code convert as much as possible to
          plain C).  Rework the 'do' function to completely override
          DBI::_::db::do, avoiding problems with the rows() function.

0.25 Patch 2
------------
96-12-13: Update Makefile.PL to help the AIX people.  Version 0.25p2 created
          but only the Makefile.PL changes sent to the dbi-users@fugue.com so
          not released officially, though available publicly.

0.25 Patch 1
------------
96-12-10: Handle 5.00 and 5.01 by supplying actual array names to GET
          DESCRIPTOR, thus bypassing the bug.  Note that it does affect 5.01
          too; edited esql5_00.h to match.  Patch sent to Jeff Rowe who
          confirms it works.  (Note to JL: 5.01 found on Godzilla; what is
          installed as 5.00 is actually 4.10 ESQL/C).  Version 0.25p1 created
          but not released officially or publicly.

0.25 Release
------------
96-12-09: Finally worked out how SQL descriptors handle blobs.  Code now works
          safely with blobs located in memory.  However, with ESQL/C 7.21.UC1
          on Solaris 2.4, there is a memory leak corresponding to the space
          allocated for the blobs for a given statement unless you manually
          release it before deallocating the descriptor.  This is nasty, and
          may not be true of other versions.  Added test t/blob02.t.  Note
          that t/blob03.t uses the data created by t/blob02.t, so it must be
          run (reasonably successfully) before t/blob03.t can be run
          successfully.  Use decsci.[ch] code (plus auxilliary function
          decgen() inside dbdimp.ec) to format FLOAT, SMALLFLOAT, DECIMAL and
          MONEY quantities.  The 5.0x and 6.0x libraries do not always handle
          these gracefully.

With Thanks to the DBD::Informix v0.25 Testing Team:
John Wang - wangj@aromat.com
Del Simmons - del@infoman.com
Dave Thomas - dave@thomases.com
Oyvind Gjerstad - ogj@tglobe1.tollpost.no
Jeff Rowe - j.p.rowe@larc.nasa.gov
Rodlyn Joseph - bluephi@sharpcomm.com
Duc Nguyen - dhn@benvolio.nova.att.com
Serge Davidov - serge@fcmc.com

96-12-05: More revisions to Makefile.PL, some putting teeth into the
          prerequisites, some more dealing with DEC OSF (there's a compiler
          flag to say set __STDC__, as there usually is).  Rename nm_* inside
          the imp_sth structure.  Redefine the type of imp_sth->blobs and
          upgrade code to match.  Test t/blob03.t passes; some work to do to
          get t/blob04.t to pass.  Improved README.  Etc.
96-12-04: Update Makefile.PL to overcome Dave Thomas problems on DEC OSF
          (version 25.13 sent to him for approval, and comments incorporated
          into version 25.14 .. 25.16).  Also finish converting the tests in
          the t directory.
96-12-03: Update Makefile.PL (and esqlcc) to use '$(FULLPERL) esqlcc' etc.
          Rename the extratests directory to t for automatic testing as
          documented in the Test::Harness module.  Create (and document)
          InformixTest.pm to help with the test programs.  Note that
          test.pl does not exploit it all that much because it has to test
          some more basic stuff.  However, the other tests do use it.
          NB: ESQL/C 5.00 and 5.01 have a bug in the SQL descriptor code
          which means that using 'char *' as a type restricts you to precisely
          3 characters of data.  This is fixed in 5.02 and above.  Dammit!
96-12-02: Release 0.25b3 with some work incomplete.  Update Makefile.PL so
          that "make perl" works.  Note that INSERT and blobs does not work!
96-12-01: Upgrade Makefile.PL to use new Perl scripts esqlcc, esqlsed and
          esqlld to protect platforms such as DEC OSF/1 where the C
          compiler is not used to link shared libraries.  Also, only use
          GCC warnings when DBD_GCC_DEBUG is set in the environment.  Also
          use $(RM_F) to remove the generated C files instead of $(RM) so
          that it works for platforms like SCO where $(RM) is not defined
          by MAKE automatically.
96-11-30: Move sqlca handling to connection (not statement).
          Fix blob handling to the extent that SELECT works.  (INSERT and
          UPDATE still need fixing.  INSERT will probably be able to adapt
          the SELECT code to handle blobs.  UPDATE will be very tricky.
          Memory leaks may (probably) occur.
          Upgrade Makefile.PL to always set INFORMIXC when compiling ESQL/C.
96-11-26: Feedback from beta testers incorporated into build process.
          Not all problems will be resolved yet.  Version 0.25b2.
96-11-25: Changes leading up to 0.25b1 release.  Add sqlca record handling
          for statements.  Add use of EXEC IMMEDIATE when feasible.
96-11-19: Rewrite of dbdimp.ec more or less complete.  The ESQL/C code
          has been almost totally rewritten; the Perl interface code is
          still similar to what was there previously.  Nearly ready to go
          into release.  5.0x ESQL/C not linking OK on Solaris; not sure
          why.  7.21 is doing fine.
96-11-01: Control transferred to Jonathan Leffler <johnl@informix.com>.

0.24 Release
------------
96-09-26: Patches from Terry arrived.  This'll be the 0.25 release.  Seems to
          work.

0.23 Release
------------
96-09-18: Wrapped in a patch to Makefile.PL from Christophe Martin.  Added
          some other Makefile.PL patches of my own.  It should now support
          cleaner builds on HP-UX (spit!) and correctly detect when dbdimp.ec
          has changed.
96-09-18: Wrapped in patches by Terry Nightingale based on Bill Hailes'
          isqlperl for supporting multi-cursors.  Cleaned the type handling
          code again.
96-09-17: Added patch for bad column names as show in George Vicherek's
          splendid test case. (extratests/primitives.pl exercises this)

0.22 Release
------------
96-09-10: Fixed all numeric types to return correctly.  CHAR fields don't
          quite behave as planned, or perhaps they do.  Added 'multicursor'
          test which proves that simultaneous multiple cursors fail miserably.
96-09-09: Added @ary = $drh->func('_ListDBs'); method for getting a list of
          extant databases on the local Informix server.  (From original code
          and suggestion by George.Vicherek@Sciatl.COM)

0.21 Release
------------
95-09-01: Fixed truncated INTEGER bug.  Other numerical types still screwed.
          Patch on the way.

Pre-Release
-----------
96-04-14: Added support for CREATE, DROP, INSERT, UPDATE and DELETE.  Fixed
          $DBI::errnum and $DBI::errstr problems.  Fixed Informix.pm to stop
          reporting MSQL_HOME errors.  Fixed Makefile.PL.  Removed hacky
          'build' file and uses Makefile.PL exclusively now.
95-10-17: After a good break of about a month and a half, back in the saddle.
          We have data from SELECTs coming back from the database!  Released
          0.20pl0 Disney on ftp.mcqueen.com.  Limited hacker release.
95-08-18: Started.  Version 0.0.0 (Totally pre-alpha!)

--------------

Jonathan Leffler <johnl@informix.com>
@(#)$Id: ChangeLog,v 57.8 1997/10/28 02:50:37 johnl Exp $
