libpgcommon is a new static library to allow sharing code among the
various frontend programs and backend; this lets us eliminate duplicate
implementations of common routines. We avoid libpgport, because that's
intended as a place for porting issues; per discussion, it seems better
to keep them separate.
The first use case, and the only implemented by this patch, is pg_malloc
and friends, which many frontend programs were already using.
At the same time, we can use this to provide palloc emulation functions
for the frontend; this way, some palloc-using files in the backend can
also be used by the frontend cleanly. To do this, we change palloc() in
the backend to be a function instead of a macro on top of
MemoryContextAlloc(). This was previously believed to cause loss of
performance, but this implementation has been tweaked by Tom and Andres
so that on modern compilers it provides a slight improvement over the
previous one.
This lets us clean up some places that were already with
localized hacks.
Most of the pg_malloc/palloc changes in this patch were authored by
Andres Freund. Zoltán Böszörményi also independently provided a form of
that. libpgcommon infrastructure was authored by Álvaro.
The old code was using exit_horribly or die_horribly other depending on
whether it had an ArchiveHandle on which to close the connection or not;
but there were places that were passing a NULL ArchiveHandle to
die_horribly, and other places that used exit_horribly while having an
AH available. So there wasn't all that much consistency.
Improve the situation by keeping only one of the routines, and instead
of having to pass the AH down from the caller, arrange for it to be
present for an on_exit_nicely callback to operate on.
Author: Joachim Wieland
Some tweaks by me
Per a suggestion from Robert Haas, in the ongoing "parallel pg_dump"
saga.
Parallel pg_dump wants to have multiple ArchiveHandle objects, and
therefore multiple PGconns, in play at the same time. This should
be just about the end of the refactoring that we need in order to
make that workable.
This is another round of refactoring to make things simpler for parallel
pg_dump. pg_dump.c now issues SQL queries through the relevant Archive
object, rather than relying on the global variable g_conn. This commit
isn't quite enough to get rid of g_conn entirely, but it makes a big
dent in its utilization and, along the way, manages to be slightly less
code than before.
In commit 6545a901aa, I removed the mini SQL
lexer that was in pg_backup_db.c, thinking that it had no real purpose
beyond separating COPY data from SQL commands, which purpose had been
obsoleted by long-ago fixes in pg_dump's archive file format.
Unfortunately this was in error: that code was also used to identify
command boundaries in INSERT-style table data, which is run together as a
single string in the archive file for better compressibility. As a result,
direct-to-database restores from archive files made with --inserts or
--column-inserts fail in our latest releases, as reported by Dick Visser.
To fix, restore the mini SQL lexer, but simplify it by adjusting the
calling logic so that it's only required to cope with INSERT-style table
data, not arbitrary SQL commands. This allows us to not have to deal with
SQL comments, E'' strings, or dollar-quoted strings, none of which have
ever been emitted by dumpTableData_insert.
Also, fix the lexer to cope with standard-conforming strings, which was the
actual bug that the previous patch was meant to solve.
Back-patch to all supported branches. The previous patch went back to 8.2,
which unfortunately means that the EOL release of 8.2 contains this bug,
but I don't think we're doing another 8.2 release just because of that.
pg_backup_db.c contained a mini SQL lexer with which it tried to identify
boundaries between SQL commands, but that code was not designed to cope
with standard_conforming_strings, and would get the wrong answer if a
backslash immediately precedes a closing single quote in such a string,
as per report from Julian Mehnle. The bug only affects direct-to-database
restores from archive files made with standard_conforming_strings = on.
Rather than complicating the code some more to try to fix that, let's just
rip it all out. The only reason it was needed was to cope with COPY data
embedded into ordinary archive entries, which was a layout that was used
only for about the first three weeks of the archive format's existence,
and never in any production release of pg_dump. Instead, just rely on the
archive file layout to tell us whether we're printing COPY data or not.
This bug represents a data corruption hazard in all releases in which
standard_conforming_strings can be turned on, ie 8.2 and later, so
back-patch to all supported branches.
a separate archive entry for each BLOB, and use pg_dump's standard methods
for dealing with its ownership, ACL if any, and comment if any. This means
that switches like --no-owner and --no-privileges do what they're supposed
to. Preliminary testing says that performance is still reasonable even
with many blobs, though we'll have to see how that shakes out in the field.
KaiGai Kohei, revised by me
If expand_dbname is non-zero and dbname contains an = sign, it is taken as
a conninfo string in exactly the same way as if it had been passed to
PQconnectdb. This is equivalent to the way PQsetdbLogin() works, allowing
PQconnectdbParams() to be a complete alternative.
Also improve the way the new function is called from psql and replace a
previously missed call to PQsetdbLogin() in psql. Additionally use
PQconnectdbParams() for pg_dump and friends, and the bin/scripts
command line utilities such as vacuumdb, createdb, etc.
Finally, update the documentation for the new parameter, as well as the
nuances of precedence in cases where key words are repeated or duplicated
in the conninfo string.
post-data step is run in a separate worker child (a thread on Windows, a child
process elsewhere) up to the concurrent number specified by the new pg_restore
command-line --multi-thread | -m switch.
Andrew Dunstan, with some editing by Tom Lane.
returns NULL instead of a PGresult. The former coding would fail, which
is OK, but it neglected to give you the PQerrorMessage that might tell
you why. In the oldest branches, there was another problem: it'd sometimes
report PQerrorMessage from the wrong connection.
the server version check is now always enforced. Relax the version check to
allow a server that is of pg_dump's own major version but a later minor
version; this is the only case that -i was at all safe to use in.
pg_restore already enforced only a very weak version check, so this is
really just a documentation change for it.
Per discussion.
PQconnectionNeedsPassword function that tells the right thing for whether to
prompt for a password, and improve PQconnectionUsedPassword so that it checks
whether the password used by the connection was actually supplied as a
connection argument, instead of coming from environment or a password file.
Per bug report from Mark Cave-Ayland and subsequent discussion.
error message, by using PQconnectionUsedPassword() instead. Someday
we might be able to localize that error message, but not until this
coding technique has disappeared everywhere.
o remove many WIN32_CLIENT_ONLY defines
o add WIN32_ONLY_COMPILER define
o add 3rd argument to open() for portability
o add include/port/win32_msvc directory for
system includes
Magnus Hagander
> found in a pg_dump archive. It had problems with dollar-quote tags
broken across bufferload boundaries (this may explain bug report from
Rod Taylor), also with dollar-quote literals of the form $a$a$...,
and was also confused about the rules for backslash in double quoted
identifiers (ie, they're not special). Also put in placeholder support
for E'...' literals --- this will need more work later.
using the recently added lo_create() function. The restore logic in
pg_restore is greatly simplified as well, since there's no need anymore
to try to adjust database references to match a new set of blob OIDs.
multiline command or to rerun the command easily later.
Whereas displaying the failed SQL command is a matter of fixing the
error
messages.
The latter is complicated by failed COPY commands which, with
die-on-errors
off, results in the data being processed as a command, so dumping the
command will dump all of the data.
In the case of long commands, should the whole command be dumped? eg.
(eg.
several pages of function definition).
In the case of the COPY command, I'm not sure what to do. Obviously, it
would be best to avoid sending the data, but the data and command are
combined (from memory). Also, the 'data' may be in the form of INSERT
statements.
Attached patch produces the first 125 chars of the command:
pg_restore: [archiver (db)] Error while PROCESSING TOC:
pg_restore: [archiver (db)] Error from TOC Entry 26; 1255 16449270
FUNCTION
plpgsql_call_handler() pjw
pg_restore: [archiver (db)] could not execute query: ERROR: function
"plpgsql_call_handler" already exists with same argument types
Command was: CREATE FUNCTION plpgsql_call_handler() RETURNS
language_handler
AS '/var/lib/pgsql-8.0b1/lib/plpgsql', 'plpgsql_call_han...
pg_restore: [archiver (db)] Error from TOC Entry 27; 1255 16449271
FUNCTION
plpgsql_validator(oid) pjw
pg_restore: [archiver (db)] could not execute query: ERROR: function
"plpgsql_validator" already exists with same argument types
Command was: CREATE FUNCTION plpgsql_validator(oid) RETURNS void
AS '/var/lib/pgsql-8.0b1/lib/plpgsql', 'plpgsql_validator'
LANGU...
Philip Warner
will treat any unquoted string that starts with a $ and has no preceding
identifier chars as a potential $-quote tag, it then makes sure that the
tag chars are valid. If so, it processes the $-quote.
Philip Warner
