and provides the callback when tab is pressed. Due to
readline's licensing there is funky stuff going on on Mac.
If the above clues do not help then please send me private email and I'll
work with you to get this working for you.
Roger
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#how_to_corrupt
The chance of there being a bug in SQLite is extremely small. First of all
some of the other billions of users would have noticed. Secondly the
testing is extraordinary:
http://www.sqlite.org/testing.html
Roger
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calls are made -
VFS. However controlling when and why they are made are in the pager code.
When you work on the real SQLite source you'll find pager.c and pcache.c.
Roger
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. It would be nice if there were virtual
tables allowing dynamic introspection of SQLite.
(*) In a fit of OCD it even pays attention to what case you are using and
does completions in the same case even if you mix cases in the same word!
Roger
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the
behaviours are a little inconsistent:
http://code.google.com/p/apsw/issues/detail?id=115
Roger
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iEYEARECAAYFAk2g1JgACgkQmOOfHg372QTjRQCcDVMaLLR27OQWCVI/4R7yTVZ3
j
Mac OS X 10.6.7 MacBook Pro 2.4 GHz Intel Core 2 Duo
/Users/roger/Desktop
roger-wehages-macbook-pro:Desktop roger$ ./sqlite3_analyzer
dyld: Library not loaded: /usr/local/lib/libtcl8.6.dylib
Referenced from: /Users/roger/Desktop/./sqlite3_analyzer
Reason: image not found
Trace/BPT trap
will predominantly be sequential access.
These factors are why it is a not a trivial determination as to which is
better and why analyze helps. It is also why an index can be slower more
commonly than expected.
Roger
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it used after free.
Roger
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iEYEARECAAYFAk2K2bMACgkQmOOfHg372QTPtACffp7nZHH7jhEm9NZajdFIsC5b
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=B25D
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for sqlite3_open16 you'll see that it
converts the filename to UTF8 and then calls the normal open routine.
sqlite3_open16_v2 would just do the same thing, so you can achieve the same
affect by converting the filename to utf8 yourself and calling sqlite3_open_v2.
Roger
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://sqlite.org/support.html
Roger
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iEYEARECAAYFAk114joACgkQmOOfHg372QT31gCfWnaWAHyBxeo+kBrSuq13I8n3
SkgAnRfUN595yjeH6qU0obADpwCE+6IU
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in advance and instead just do the actual inserts then use
last_insert_rowid to find out what was assigned (everything wrapped in a
transaction to avoid concurrency issues).
That will unambiguously always give the right answer no matter how sequences
are implemented behind the scenes.
Roger
to access data in other formats then use virtual tables. There
are no issues with attach and virtual tables. In general you can make the
first parameter to your virtual table be the name of the file it should use.
Roger
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Comment
by getting it listed at the end of
http://sqlite.org/contrib where you can see a good 'extension-functions.c'
to follow. If the team see the extension being downloaded a lot then that
is a good case for migrating it into the core.
Roger
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See also http://www.sqlite.org/src/tktview?name=13137dccf3
Roger
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not
being from different VFS, but that can only be changed by additions to the
syntax and/or API so it won't help you now.
Roger
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docs:
http://lwn.net/Articles/347547/
http://code.google.com/p/seccompsandbox/wiki/overview
Roger
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iEYEARECAAYFAk1tLiMACgkQmOOfHg372QQlxgCgjEyFPKg8KT2riZitw6hcX/78
that in Unix in many years. I shipped product in 1994 that
used it extensively (a master daemon would use accept() and then pass the
new file handles to child processes as appropriate).
I_SENDFD is the magic needed. The topic is even covered in Stevens.
Roger
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initialized.
Roger
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filenames then (on Linux)
the filename could be passed as /proc/self/fd/NN. The default unix vfs
could be changed such that filename pattern is recognized and NN+1 is
treated as the journal etc.
Roger
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function. Now make
sure it is tested, kept up to date, works with the platform SQLite etc.
It will work, but it is ugly. The question is if there is a better way.
Roger
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in the sqlite3*,
That should just point to the VFS used. There is no copying or modification.
Roger
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iEYEARECAAYFAk1j6FkACgkQmOOfHg372QTR8gCgsX+dYtQFkeYRZDskwKoQRXdc
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On 02/22/2011 02:39 PM, Robert Hairgrove wrote:
On Tue, 2011-02-22 at 08:46 -0800, Roger Binns wrote:
What you think you are seeing is not happening. The documentation is
correct.
OK ... but what about that which the GDB debugger is seeing
OFFSET/LIMIT
to get the same effect.
Roger
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you have to use Javascript which is slowly becoming the
most popular language for that kind of thing including on the desktop. (Eg
see node.js and Seed.)
Roger
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the query started.
Roger
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iEYEARECAAYFAk1jMKcACgkQmOOfHg372QTfbQCgoO3rzpBFmcZIZf2FKJitXaWv
t7AAniZ//1kazi0NIXFeUoGCqTkUwKs3
=ISAF
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to
be somewhere secure and discreet and to contain valuable items.
Roger
___
sqlite-users mailing list
sqlite-users@sqlite.org
http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
administration, backups etc. It is not a good idea to defeat
those.
Alternatively provide this all SaaS style so that everything lives on
systems you control with a web interface. That way the data and the
encryption keys will not be living on an arbitrary end user system.
Roger
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.
If transactions and ACID matter then carefully research what meets your
needs and deploying using as much redundancy and backup as appropriate.
If you can't make your mind up, write a server that provides your data REST
style and make the clients use HTTP.
Roger
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is to 'CREATE
TEMP TABLE results AS ...select...'. This will also work if someone uses
ORDER BY random() or any other udf that depends on more than its arguments.
Roger
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malloc.
The application
never used more than 10MB and it is currently using 57+MB and continues
to climb.
The single most likely explanation is this is WAL in action, the memory is
from a memory mapped file and a WAL checkpoint will release it.
http://www.sqlite.org/wal.html
Roger
-BEGIN
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On 02/20/2011 06:23 PM, Jay A. Kreibich wrote:
On Sun, Feb 20, 2011 at 05:23:09PM -0800, Roger Binns scratched on the wall:
If you want to use SQL then use Postfix.
I might suggest PostgreSQL instead.
(Sorry, Roger, I couldn't resist.)
Yeah
.
Roger
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be worse. The backup API knows how to copy from a database that is
in use, so you will always get a valid output no matter what is happening to
the source.
Roger
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On 02/19/2011 09:25 PM, Frank Chang wrote:
I wanted to thank Roger Binns for solving my problem.
You are welcome :-)
I was able to determine the sqlite database was corrupted
Just to be clear for people finding this thread in the future
/testing.html
Roger
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sqlite select 1/0.0;
INSERT INTO table VALUES(NULL);
sqlite select abs(-9223372036854775808);
Error: integer overflow
Roger
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connection (same process or not).
If there should be multiple accessors then setting a busy timeout is
probably the most appropriate solution.
See also:
http://www.sqlite.org/lockingv3.html
Roger
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completion support (quite tricky to do!), colour
output, easy extensibility, nicer dumps etc. If you have APSW installed
then you can do this to run it:
python -c 'import apsw;apsw.main()' dbfilename
Roger
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will there be any problems?
Roger
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=/deb
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I would love most in SQLite is a way of providing a query
indicating it will be run a lot in the future and SQLite can do whatever it
wants to then make it go faster, such as running ANALYZE, making indices etc.
Roger
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.html
http://blogs.msdn.com/b/oldnewthing/archive/2010/09/09/10059575.aspx
http://peter-zaitsev.livejournal.com/11177.html
http://brad.livejournal.com/2116715.html
Roger
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with stat2 and run analyze, then it is unlikely
they will be able to make use of the stat2 information.
You can make ANALYZE take a numerical argument or a word such as FULL or
QUICK to explicitly choose which flavour is used.
Roger
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code from the SQLite team means it gets tested like this:
http://www.sqlite.org/testing.html
How much test code would you need to write to be at the same level? Or
maybe you can spare one I/O thread after all :-)
Roger
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and as feedback for something
official like that in SQLite.
Roger
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://en.wikipedia.org/wiki/Database_normalization
SQLite books:
http://www.sqlite.org/books.html
Roger
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iEUEARECAAYFAk1KCYcACgkQmOOfHg372QRC1gCfbaE7tCvNKFKNkq9N14tSTOzh
. The third needs to be turned into an Exception
while NOTFOUND can be appropriately handled.
Roger
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iEYEARECAAYFAk1AeRUACgkQmOOfHg372QRThgCfX1pPMMzNRdjvcxapNGKhtCdx
that indicates syncing is optional.)
Changing things that way is a little more intrusive but is a better long
term way of structuring things than the short term expedient way
SQLITE_FCNTL_SYNC has been implemented.
Roger
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.
Roger
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for this is unchanged in many revisions of SQLite but
is getting errors from the existing VFS.
Trying to track down the cause ...
Roger
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On 01/24/2011 06:05 PM, Roger Binns wrote:
I'm finding custom VFS code is no longer working at all.
The cause is a new xFileControl operation SQLITE_FCNTL_SYNC which appears to
needlessly duplicate the existing xSync method.
Additionally unlike
to blow your mind a little further, SQLite happily allows zero
length table and columns names. This works.
CREATE TABLE ( );
INSERT INTO VALUES(3);
SELECT + FROM ;
Roger
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it from a few
hundred dollars to a few thousand.
Roger
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the SQLite authors
since you know it works and gets the security right and will continue to do so.
Roger
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iEYEARECAAYFAk0p8GEACgkQmOOfHg372QShCQCgr6BIWQMXJ9ZiJvLEYKe+Js43
- they had to put in deliberate effort. Then throw in some
mountweazels:
http://en.wikipedia.org/wiki/Fictitious_entry#Motivations_for_creation
http://en.wikipedia.org/wiki/Trap_street
This would give you enough evidence to sue a competitor.
Roger
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On 01/05/2011 11:05 AM, Greg Morehead wrote:
Any insights on how this could occur would be greatly appreciated.
http://www.sqlite.org/lockingv3.html#how_to_corrupt
Roger
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last_insert_rowid();
END).fetchall()[0][0]
Roger
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behind the scenes:
with connection:
connection.execute(... whatever ...)
Roger
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iEYEARECAAYFAk0ZlVMACgkQmOOfHg372QSnYQCfUKEmiN+ZWW/DldLPz3/6dC09
index, hence xBestIndex to find the index and xFilter not needing
much extra information to work with the selected index.
You could probably do something like have the hex address of a data
structure as the string.
Roger
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the backup API and a
dumper that provides complete output. It also has a shell that you can
extend from Python. (Disclosure: I am the APSW author.)
http://apidoc.apsw.googlecode.com/hg/backup.html
http://apidoc.apsw.googlecode.com/hg/shell.html
Roger
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hole hasn't been answered.
Whatever Fossil was vulnerable to that needed this emergency fix is
something that could affect the rest of us.
Roger
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/fdiff?v1=68a30b40cb6fde3dv2=6b2674f05c467a3c
Roger
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have been nice if there had been a least little forewarning and
consultation.
Roger
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iEYEARECAAYFAkz/EuUACgkQmOOfHg372QSQ6wCgh2UNn2KQk5FWLXw62aEnBMiF
are talking about virtual tables as in the functionality builtin to
SQLite - you issue SQL queries that the SQLite query parser and optimiser
use and provide backend data:
http://www.sqlite.org/vtab.html
Roger
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) but I can't implement it without
great risk of memory corruption as I can't control what elsewhere does with
the pointer. There are also some data structures that are not reference
counted such as the VFS so you don't know if it is safe to remove or change
at any point.
Roger
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level language like Python:
http://apidoc.apsw.googlecode.com/hg/example.html#example-vtable
Roger
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iEYEARECAAYFAkzrZUwACgkQmOOfHg372QR1CQCZAaOBwSBoMuBWdM5q0vONUqCp
calls have to go via a function pointer table not directly to SQLite so
it can't simultaneously be a Python extension and a SQLite extension,
although I guess the pointer table could be faked.
Roger
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nicer dumps than the SQLite shell
(eg there are comments in it) and you can easily add your own commands if
you want to provide a more interactive experience doing the data importing.
http://apidoc.apsw.googlecode.com/hg/vtable.html
http://apidoc.apsw.googlecode.com/hg/shell.html
Roger
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this
it is a requirement that the VFS API versions match hence the message.
Roger
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that sqliteDefaultBusyCallback
tries when USLEEP is available:
{ 1, 2, 5, 10, 15, 20, 25, 25, 25, 50, 50, 100 }
Roger
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semantics be changed so that the error code and string become thread
local just like errno and GetLastError are, but DRH didn't want to do this
because there *may* be code out using SQLite that does calls in one thread
and retrieves error information in a different one.
Roger
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issues.
If that doesn't catch anything then it is likely an I/O issue (eg doing a
write and then a read of the same area doesn't give the same data back).
You can enable I/O tracing by compiling with -DSQLITE_ENABLE_IOTRACE and
doing whatever else is required for it to output the traces.
Roger
names for SQLite extensions.
My test extension has the imaginative filename under all operating
systems of testextension.sqlext.
Roger
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of virtual tables.
This is very easy to do: plug - my Python wrapper:
http://apidoc.apsw.googlecode.com/hg/vtable.html
Roger
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a dot command to set the
cautious length, make it freely available and see how many people pounce on
your new functionality :-)
Roger
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2006.
Roger
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On 11/11/2010 09:40 PM, Roger Binns wrote:
A ticket that has been open on this topic since January 2006.
Oops, forgot to paste:
http://www.sqlite.org/src/tktview?name=23b2128201
Roger
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are really arguing is that the SQLite
developers should do this work for you, then I'm sure they'd be happy to
give you a quote. Start here:
http://www.hwaci.com/sw/sqlite/prosupport.html#mods
Roger
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percentage of the
codebase it covers. Say if that is just lines or decision points (MCDC).
Say what kinds of testing there are (eg correctness, memory allocation, data
integrity etc).
Roger
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or sorting which
mainly means a collation. However it is usually better to store an
additional column with the formatted data rather than have functions
repeatedly called whenever SQLite needs to access the row.
Roger
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to do (eg sleep, retry, give up
after however many retries etc). That is hard to express in SQL.
such as pysqlite in python.
APSW has had the functionality since SQLite introduced it. pysqlite had
it added to the development code this week.
http://groups.google.com/group/python-sqlite
Roger
://www.sqlite.org/lockingv3.html#how_to_corrupt
Roger
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.
Are you aware that SQLite has an RTree extension (written by one of the
SQLite developers) that seems to substantially overlap with what you are doing?
http://www.sqlite.org/rtree.html
Roger
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the encoding as a space or cpu
optimization, but this is *very* unlikely to be the space/cpu issue with
your application.
Yes, I know about surrogate pairs and no I won't mention how they could
complicate matters.
Roger
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. However SQLite does not actually check
that it is valid UTF8 encoding. Consequently it is possible to insert
random binary data using the text APIs and for it appear to all work correctly.
The dump code stops at the first null in any text value but will correctly
output a blob value.
Roger
as is likely the
case for your situation. At the SQL level you use X prefix and hex:
insert values( X'7f3c22005d' )
using the PHP PDO API...
A Google search found these:
http://bugs.php.net/bug.php?id=41135
http://bugs.php.net/bug.php?id=42443
Roger
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that you can determine a measure of how bad the fragmentation is, and
your code can be quick and crude.
Roger
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iEYEARECAAYFAkzAU7UACgkQmOOfHg372QQRkwCfUFLhRUwAVzLb1dOUOkADKl+s
thank you for answer Igor
At once , i didn't knew if i could use restore function with sqlite corrupt
database file .It seems that if i use corrupt file or empty file, restore
function failed . With database file and table dropped it's ok
Regards
Roger
thank you
De : Igor Tandetnik itandet...@mvps.org
À : sqlite-users@sqlite.org
Envoyé le : Jeu 14 octobre 2010, 2h 28min 18s
Objet : Re: [sqlite] restore function
Roger MARTINEZ roger.martine...@yahoo.fr wrote:
restore function is not ok for me .
Before I make
---
-
0 main /home/roger/htdocs/essai/spip/config/bases/spip.save
...
sqlite.restore spip.sqlite spip.save
Error: unknown database spip.sqlite
it's the same with sqlite3.7.3 ; bug?
thank you for answer
Roger
ways it fails, error codes and any side effects.
Roger
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the database using the journal to get it back into a
correct state which involves writing. Heck even while you have it open and
idle, a writer could have started a transaction and crashed requiring recovery.
Roger
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time has no value you could code something similar
yourself if that is what your needs are.)
Roger
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iEYEARECAAYFAkyyae0ACgkQmOOfHg372QRHwACgkLVkD3Y0dWw0vzLRlKk0yeGJ
the source to work out. I guess it is too late to change
the code to avoid the destructor on error conditions so this behaviour
should be documented.
Roger
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On 10/03/2010 10:01 PM, Max Vlasov wrote:
On Sun, Oct 3, 2010 at 7:21 PM, Roger Binns rog...@rogerbinns.com wrote:
Also note that xTruncate may be called to make a file longer.
Roger, are you sure about that?
That has certainly been stated
rather than trying to glue to io::stream directly.
My documentation may also provide some insight:
http://apidoc.apsw.googlecode.com/hg/vfs.html
Roger
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also ideally make sure that if the data source is a local file then
the same file being opened by regular SQLite will be ok and not cause
corruption.
Roger
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to return an xor'd file instance and then override the latter's xRead
and xWrite to xor the data before passing to the parents xRead/xWrite.
With VFS it is good practise to punt to as much existing code as possible,
only providing overridden methods where your VFS adds value.
Roger
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implementation that is always correct.
2. If ignoring #1, prove that the network disk implementation is correct
before blaming SQLite.
3. Watch out for other background tag-a-longs causing weird behaviour on
Windows.
Roger
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networked filesystems. There isn't a
secret setting specifically disabled that when enabled would fix this
for you.
Ok, there is one and you can't use WAL and you won't get multi-client
concurrency:
http://www.sqlite.org/cvstrac/wiki?p=ProxyLocking
Roger
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transformation.
Roger
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