>
> The query is on a visits table from a google chrome history database. The
> query seems to work OK if a single bit is set, but fails (a blank string is
> returned) when multiple bits are set. Any ideas why?
>
It's because none of the WHEN 0x... cases, except 0xC0..., have multiple
bits set.
In response to this SO question:
http://stackoverflow.com/questions/28377210/how-to-retrieve-rank-based-on-total-mark-in-sqlite-table
I tried to formulate a query without temp tables using an ordinary CTE, but
received an error "misuse of aggregate: sum()".
This works:
sqlite> with tt (S_id,
>
> > In response to this SO question:
> >
> >
> http://stackoverflow.com/questions/28377210/how-to-retrieve-rank-based-on-total-mark-in-sqlite-table
> >
> > I tried to formulate a query without temp tables using an ordinary
> > CTE, but received an error "misuse of aggregate: sum()".
>
tonypdmtr
For those interested in the initial "misuse of aggregate" issue of this
thread, there is now a ticket:
http://www.sqlite.org/src/tktview?name=2f7170d73b
e
On Mon, Feb 9, 2015 at 9:19 AM, Keith Medcalf wrote:
>
> Not exactly since aggregates are implemented as functions.
Thank you, Richard. It works for me now.
e
On Mon, Feb 9, 2015 at 1:30 PM, Richard Hipp <d...@sqlite.org> wrote:
> On 2/7/15, Doug Currie <doug.cur...@gmail.com> wrote:
> > In response to this SO question:
> >
> >
> http://stackoverflow.com/questions
Well, if TERM_VNULL is 0, then the code is truly unreachable, so I wouldn't
call it a compiler bug.
e
On Thu, Feb 12, 2015 at 9:26 AM, Richard Hipp wrote:
> Dan is right. I think I'd calling this a clang bug.
> On Feb 12, 2015 9:06 AM, "Dan Kennedy"
On Thu, Feb 12, 2015 at 1:35 PM, R.Smith wrote:
>
> Now one could argue the warning should not be issued for it, or some
> warnings are fine as information. Personally I prefer zero unneeded
> warnings/clutter but that's just my pedantism.
>
My pedantism is to prefer the
Suraj,
Don't use the same database connection in multiple threads. Each thread
should use its own connection. Then last insert rowid is predictable.
e
On Wed, Apr 1, 2015 at 1:10 PM, Kumar Suraj wrote:
> Hi Richard.. this wont work for me due to following reason.
>
> If a separate thread
Paul Bainter wrote:
> >
> > Not sure what happened to this post previously, so I guess I'll try it
> > again with some additional information
>
GMail considered these messages spam for some reason. Check your spam
folder.
e
___
sqlite-users mailing
On Nov 24, 2013, at 6:47 AM, Alek Paunov wrote:
>
> BTW, I see the term "deterministic" in the SQL99 BNFs:
> …
> but different in PostgreSQL ("immutable", "stable", etc):
There is value in compatibility, but those adjectives are awful. In computer
science we have
On Dec 5, 2013, at 8:55 PM, Warren Young wrote:
> On 12/5/2013 17:00, Scott Robison wrote:
>> Might there be a way to implement a custom VFS for Mac to deal with this?
>
> Wouldn't it be a lot simpler to just put the DB file into a Mac package (i.e.
> directory) so the
> There is this range of negative
> values smack in the middle of an otherwise uniformly increasing sequence of
> positive numbers. That negative range seems discombobulating.
Why are hex literals interpreted as signed at all? You could simply
consider all hex literals as unsigned values. If
> Why are hex literals interpreted as signed at all? You could simply
> > consider all hex literals as unsigned values. If you need a negative
> value,
> > prefix it with the - operator, e.g., -0x77.
> >
> > With this approach (a) there is no discombobulating segment, (b) all 64
> bit
> >
>
> > Here's an analogy: a sequence of decimal digits is unsigned; it only
> > becomes negative when you put a "-" in front of it.
> >
> > Why shouldn't hex work the same way? (to eliminate the discombobulating
> > segment)
> >
>
> Because then you would not be able to write (in hex) a 64-bit
On Mar 31, 2011, at 2:27 PM, Mike Rychener wrote:
> I have tried the latest Explorer and it gets a syntax error on STDEV.
> However, that function works in Eclipse just fine, to take the standard
> deviation of a column (like min, max, avg). Is there a workaround or
> other fix available?
On May 26, 2011, at 2:54 AM, Jan Hudec wrote:
> Gotcha! No, it's not. -1-x is equivalent, but -x-1 is not:
>
>sqlite> select -1-(1<<63), -(1<<63)-1;
>9223372036854775807|9.22337203685478e+18
>
> Besides my point was not that it's not possible, but that it would
> be more readable with
On Jun 17, 2011, at 2:56 PM, john darnell wrote:
> I am attempting to open an SQLite database on the Mac (OSX Snow Leopard) and
> am getting an error. This is the code I am using:
>
> char DBEnginePath[1000];
>
> strcpy(DBEnginePath, "Macintosh HD:Applications:Adobe InDesign
>
On Jul 27, 2011, at 9:22 AM, Baruch Burstein wrote:
> Is there an easier way to get a single value (for instance "select
> last_insert_rowid();" ) then prepare -> step -> column -> finalize?
http://www.sqlite.org/capi3ref.html#sqlite3_last_insert_rowid
e
On Aug 10, 2011, at 12:39 PM, NOCaut wrote:
> I work in VS2008 c++
> i create data base my.db and wont use U N I C O D E function from this DLL
> i find class or unit for connect to my base from VS2008
> http://sqlite.org/download.html - this link help me?
>
> you understand me?
No, but
On Sep 23, 2011, at 9:17 PM, Richard Hipp wrote:
> paper above completely ignores this issue. It is as if the authors had
> never heard of short-circuit evaluation. Or, perhaps they are familiar with
> the problem but could not reach agreement on its solution so simply didn't
> bring it up.
On Oct 24, 2011, at 11:07 AM, Dilip Ranganathan wrote:
> But as you all know, this doesn't work:
>
> select datetime(time) from table where time >=
> julianday(datetime(max(time)),'-2 hour','localtime') order by time desc
Try replacing datetime(max(time)) with (select datetime(max(time)) from
On Oct 25, 2011, at 10:59 AM, Sébastien Escudier wrote:
> CREATE TRIGGER my_trigger INSTEAD OF INSERT ON my_view
> BEGIN
> INSERT INTO table1(type) VALUES(NEW.table1.type);
> INSERT INTO table2(type) VALUES(NEW.table2.type);
> END;
>
> ...
>
> Why this syntax does not work anymore ?
You
The PIC32MX664F064L has
64 KiB Program Memory Size
32 KiB RAM
SQLite as it presently stands will not fit within these constraints.
e
On Nov 9, 2011, at 7:47 AM, Parthiv Shah wrote:
> Respected Sir,
>
> We want to use DB SQLite in our product.
>
> We are using PIC32MX664F064L
On Nov 9, 2011, at 11:39 PM, Bhautik Kothadia wrote:
> Is there any Operating System Required for that?
See: http://www.sqlite.org/custombuild.html
especially section 5.0 Porting SQLite To A New Operating System
> If not then How much Memory is required?
See:
On Wed, Mar 2, 2016 at 4:42 PM, R Smith wrote:
>
>
> Personally, unless your space is constrained, I would simply save the
> numbers as strings, perhaps Hex or BCD with leading chars and convert as
> needed. This would sort correctly without tricks and not do much worse for
> space. (Base64 would
> Is it possible to tell if SQLite has a database file locked? Not through
> OS tools, but from System.Data.SQlite?
If you can execute
BEGIN EXCLUSIVE TRANSACTION
and get back SQLITE_OK
then there were no locks on the database.
Of course you will then need to ROLLBACK.
Note that this
when multiple threads are waiting on the event;
they all wake up and compete for the resource again. For better
solutions, see: http://world.std.com/~jmhart/batons.htm
e
--
Doug Currie
Londonderry, NH, USA
-
To unsubscribe,
ts.
Of course, if you expect there to be intervals when there are no
waiting threads, and you can afford to wait for that interval for a
synchronization point, and you don't care the order in which the
inserts are performed, the Automatic Reset event might work.
e
> On 6/1/07, Doug Currie
eless, there are ways to print floating point numbers
readably. http://portal.acm.org/citation.cfm?id=93559
e
--
Doug Currie
Londonderry, NH, USA
-
To unsubscribe, send email to [EMAIL PROTECTED]
-
lest
number of digits necessary to reconstruct the number. This will be the
number of digits that Serena expects.
e
--
Doug Currie
Londonderry, NH, USA
-
To unsubscribe, send email to [EMAIL PROTECTED]
-
gcc, but I don't know what version.
However, if I compile from sources, I get
C:\Dev\sqlite\sqlite-3.4.2\bld>.\sqlite3
SQLite version 3.4.2
Enter ".help" for instructions
sqlite> select round(98926650.5, 1);
98926650.5
I am using:
$ gc
ons, and so
results between Microsoft Visual C++ compiled and gcc compiled
versions of sqlite3 are bound to produce different results.
Why my gcc 3.4.5 compiled sqlite3.exe and the one from the sqlite.org
downloads page produce different results is still a mystery to me.
e
--
Doug Currie
L
g and
double; that's why I keep harping on Steele and White's (and
Clinger's) PLDI 1990 papers. What I don't know is why this bug appears
in the binary from sqlite.org but not in the version I build myself
with gcc 3.4.5 from SQLite version 3.4.2 source.
e
--
D
On Wednesday, September 05, 2007 Arjen Markus wrote:
> Doug Currie wrote:
>>I suspect the bug is in the functions that convert between string and
>>double; that's why I keep harping on Steele and White's (and
>>Clinger's) PLDI 1990 papers. What I don't know is
hereas gcc uses 96 bits (64 bit mantissa). Note that
realvalue above is declared as LONGDOUBLE_TYPE (long double).
http://msdn2.microsoft.com/en-us/library/9c3yd98k(VS.80).aspx
http://msdn2.microsoft.com/en-us/l
e pad character is a
> .
So, using this terminology, the SQLite default collating sequence has
the NO PAD attribute, and the pad character is NUL.
Jeff, can you solve your problem with a custom collating sequence?
e
--
Doug Currie
Londonderry, NH, USA
> This mailing-list business is becoming a royal pain in the derriere.
> Every other mailing list behaves differently... some default to the
> list, others to the OP. Why can't we all get along.
> Please set the list so default reply is to the list.
http://www.unicom.com
p=BlueSky the shadow pager.
> Note, I'm not suggesting that you should implement anything like this
> in SQLite...
Me neither. ;-)
e
--
Doug Currie
Londonderry, NH
Monday, September 25, 2006, 1:46:12 PM, David Champagne wrote:
> and then I execute a query
> SELECT * FROM License WHERE FORM = "form";
> I get all rows returned
Try:
SELECT * FROM License WHERE FORM = 'form';
e
--
Doug Cur
have escaped the notice of users on non-posix systems.
>>
>> One can register a Ctrl-C handler on Windows with SetConsoleCtrlHandler.
>> But the handler is invoked on a background thread created by the system
>> specifically for this purpose, so sqlite3_interrupt couldn't be used
is hardly ever a reason to do this
since gcc will link against the DLL directly.
e
--
Doug Currie
Londonderry, NH, USA
-
To unsubscribe, send email to [EMAIL PROTECTED]
-
21388.0
sqlite> Select julianday('0001-11-24 12:00:00');
1721753.0
There is no year 0. The calendar goes from -1 BCE to 1 CE. -11-24
is 1 BCE. So, if you want November 24, 4714 B.C. you need to say
sqlite> Select julianday('-4713-11-24 12:00:00');
0.0
e
were first published in 1974 by Don Chamberlin and Ray
Boyce at the ACM–SIGFIDET Workshop on Data Description, whereas "ess
cue ell" is used for subsequent standardized versions of the language.
e
--
Doug Currie
Londonderry, NH, USA
--
On Jun 1, 2010, at 2:24 PM, Gilles Ganault wrote:
> Actually, it's a Blackfin processor, and since it's an embedded
> environment, RAM and storage (NAND) are an issue.
You may find eLua interesting. http://www.eluaproject.net/
The supported platforms are heavily ARM based, but in the same
On Aug 19, 2010, at 4:00 PM, David Bicking wrote:
> I haven't tried RAISE(ROLLBACK... as that seems to severe.
> RAISE(ABORT... removes the initial insert to Table1, which I want to avoid.
> RAISE(FAIL.. on lets say the fourth record inserted in to Table2, would leave
> the first three there,
On Aug 24, 2010, at 10:57 AM, Nikolaus Rath wrote:
> Nikolaus Rath writes:
>> Still no one able to clarify the issues raised in this thread?
>>
>> Let me try to summarize what I still don't understand:
>>
>> - Will SQLite acquire and release an EXCLUSIVE
On Nov 28, 2010, at 11:18 AM, Rick Regan wrote:
> Michael,
> Thanks for the very thorough analysis.
This is a difficult problem; fortunately it was solved 20 years ago...
http://www.mail-archive.com/sqlite-users@sqlite.org/msg09529.html
e
___
On Nov 28, 2010, at 5:37 PM, Rick Regan wrote:
> On Sun, Nov 28, 2010 at 4:01 PM, Doug Currie <doug.cur...@gmail.com> wrote:
>
>> On Nov 28, 2010, at 11:18 AM, Rick Regan wrote:
>>
>>> Michael,
>>> Thanks for the very thorough analysis.
>&
On Nov 28, 2010, at 6:19 PM, Rick Regan wrote:
> On Sun, Nov 28, 2010 at 5:52 PM, Doug Currie <doug.cur...@gmail.com> wrote:
>
>>
>> There is a new publication on this subject that may be of interest to those
>> looking at providing solutions:
>>
>
On Nov 29, 2010, at 9:37 AM, Rick Regan wrote:
> "For IEEE 754 double-precision numbers and 64-bit integers roughly
> 99.4% of all numbers can be processed efficiently. The remaining 0.6% are
> rejected and need to be printed by a slower complete algorithm."
>
> Hmmm. What's involved in the
On Dec 7, 2010, at 10:49 AM, Csom Gyula wrote:
> It clarified the situation, that is backup-restore seems to be the best
> choice:) Just one more question. As you put backup-restore is based upon data
> pages (that could be binary a format I guess) not on plain SQL/data records.
> After all:
he reason an import library isn't included is because you need a
> different one for each compiler you use to link.
Right, and with gcc on Windows (mingw/msys or cygwin), you don't need
an import library at all; gcc will link against the DLL itself.
e
On Aug 10, 2008, at 2:12 PM, CAVALO SCHMIDT wrote:
> salutations, using VC++ in WinXP.
>
> I would like to know if it's possible to import and use the
> sqlite3.dll file and/or the sqlite database file as a resource in a
> C++ project, so that it will be integrated to the final Win32
>
On Nov 12, 2008, at 10:31 PM, henry wrote:
> my app, I opened a database handler, insert some records, delete some
> records, then closed the database handler. The problem is the next
> time
> when I connect the Sqlite, the actions I did last time has all gone
> away, it did not take any
On Nov 18, 2008, at 5:10 AM, Roshan Sullad wrote:
> [...]
> I have another Visual studio test application where I am using this
> Sqlite3.dll functionality, I have linked statically to Sqlite3.dll by
> including *sqlite3.c,sqlite3.h,sqlite3ext.h* , files in to my test
> application project. And
On Nov 25, 2008, at 1:44 PM, Igor Augusto Guzzo wrote:
> I get an ARM based embedded system (AT91SAM9260 - ATMEL), linux based,
> with uclibc library and my code, developed in C with the sqlite3
> library, runs fine only in my host linux (Fedora).
>
> Firstly, I compiled the code on Makefile
On Mar 12, 2009, at 12:01 AM, jonwood wrote:
> PaymentDate=2009/01/05
Note the '/'s
> And then I ran the following query:
>
> SELECT * FROM Payments WHERE FK_CustomerID=5 AND DATE(PaymentDate) >=
> DATE('2009-01-01') AND DATE(PaymentDate) <= DATE('2009-03-11')
Note the '-'s.
'2009/' >
On Mar 12, 2009, at 12:08 AM, jonwood wrote:
> Doug Currie-2 wrote:
>>
>> Note the '/'s
>>
>
> What does this mean? What does DATE('2009-1-1') or DATE('2009/1/1')
> return?
> Does DATE() simply have no effect whatsoever?
Sorry to be cryptic.
sqlite> select
On Apr 22, 2009, at 4:38 PM, Pavel Ivanov wrote:
> I've tried to set pragma synchronous = on (it's off by default for
> me), but it makes application to work 5 times slower which is not
> acceptable for me. I would be happy if there was some solution in
> between that, i.e. for example just a
On May 15, 2009, at 9:07 AM, Sam Carleton wrote:
> I would like CURRENT_TIMESTAMP to be more accurate than just one
> second, any suggestions on how I might do that once? My solution is
> all a C/C++ interface, so all features are open to me.
Option 1 - use: julianday('now') instead of
On May 18, 2009, at 5:32 PM, Allen Fowler wrote:
>>> The simple solution would just create a race condition... i think:
>>>
>>> 1) INSERT INTO status_table FROM SELECT oldest task in queue
>>> 2) DELETE oldest task in queue
>>>
>>> Right?
>>
>> It might work fine if you wrap it in an exclusive
On May 19, 2009, at 10:05 AM, Jean-Denis Muys wrote:
> On 5/19/09 2:44 PM, "Igor Tandetnik" wrote:
>>
>> Wikipedia gives a definition different from yours, for what it's
>> worth:
>>
>> http://en.wikipedia.org/wiki/Remainder#The_case_of_general_integers
>
> Also to
On Jun 12, 2009, at 3:46 PM, Allen Fowler wrote:
> sqlite>
> select *, min((strftime('%s', end) - strftime('%s', start))) as
> length
> from
> ...> events where
> ...> start < datetime('now', '+1 day','start of day',
> '+9 hours','+30 minutes')
> ...> and end > datetime('now', '+1
On Jul 7, 2009, at 4:36 PM, nixonron wrote:
> conn = sqlite3.connect('c:\Ujimadata\aid.sqlite')
Perhaps you meant
conn = sqlite3.connect('c:\\Ujimadata\\aid.sqlite')
or
conn = sqlite3.connect('c:/Ujimadata/aid.sqlite')
e
___
sqlite-users mailing
On Jul 24, 2009, at 8:44 AM, D. Richard Hipp wrote:
> SQLite database files are cross-platform. All you have to do is copy
> the file to the new machine. There is no separate "external format".
> The same database file format work on all platforms.
Just make sure that if you are moving to a
On Jul 27, 2009, at 10:33 AM, CityDev wrote:
> It's true that Codd and Date used the term 'relational' (They
> championed the
> N-ary Relational Model - others were around at the same time) but
> it's not
> easy to track the origin of the term in mathematics.
On Aug 23, 2009, at 6:46 AM, Chris Dew wrote:
> Note: this is not for production code, just an experiment in keeping a
> history of application 'state', allowing current state to be
> recalculated if an historic input is received 'late'. See
>
Tuesday, July 19, 2005, 12:19:48 PM, Aaron wrote:
> We are inserting records into SQLite databases, and in our testing
> have discovered that in some circumstances it is possible to be
> inserting records inside a transaction, yet not have the fact that
> the database journal file is growing
Wednesday, August 10, 2005, 5:57:50 AM, Ivo wrote:
IK> Hello,
IK> It seems that at least under windows there are rounding problems with the
IK> milliseconds:
IK> sqlite> select strftime("%f", "2005-01-01 12:34:55.122");
IK> 55.121
IK> [...]
IK> Is this maybe a problem of the underlying
See http://lists.debian.org/debian-arm/2003/10/msg00030.html
ARM has at least two FL formats.
> from the ARM Architecture Reference Manual, Page C2-4:
>
> "The word order [for DP format] defined here for the VFP architecture
> differs from that of the earlier FPA floating-point architecture. In
Thursday, August 18, 2005, 3:18:56 PM, Frank wrote:
> I repeated the test using the value 1.2345678 in order to be
> able to identify the position of each byte:
> linux i386:
> 1bde8342cac0f33f
> 0100
> linux arm:
> cac0f33f1bde8342
> 0100
> So, it indeed looks like
KW> I downloaded the raw source and ran 'configure' and 'make' from a
KW> separate folder. The resulting output I copied to /usr/lib/sqlite. In
KW> it a see the bunch of .lo, .o and the two .la files (libsqlite3.la,
KW> libtclsqlite3.la)
KW> I am use to a Visual Studio build environment, but
heme
have rationals as well as real, complex, and arbitrary precision
integer numbers. http://mathworld.wolfram.com/RationalNumber.html
--
Doug Currie
Londonderry, NH
oduce a new static type, called
DYNAMIC, that permits any value. Summarizing and seconding Dennis
Cote's suggestion, perhaps columns that have no type declared, or that
are declared DYNAMIC, behave as SQLite does today, and columns that
have static declarations behave as if they are statically typed
A brief report on building sqlite-3.3.4 with MinGW/MSYS and tcl84 on
WinXP...
1. After configure, a small edit was necessary to the Makefile; for
some reason libtool doesn't put .lo objects into .libs subdirectory
anymore; there was also an issue reported on the mailing list with
stripping the
e);
> create index source_idx on Media (key,source);
> create index key_source_val_idx on Media (key,source,value);
I wonder what effect
create table Media (id INTEGER PRIMARY KEY, key, value, source integer);
would have on your query time. This would use the already built-in
BTree index.
e
--
improved.
> I couldn't agree more with you.
> Thanks for the help!
> Regards,
> -- Tito
--
Doug Currie
Londonderry, NH
Thursday, May 4, 2006, 1:27:49 PM, Dennis Cote wrote:
> More mysteries. To investigate this low insert performance under WinXP I
> wrote a simple test program that loops writing one character to a file
> and then flushing the file. The strange thing is that it seems to
> alternate between two
On Oct 30, 2009, at 10:14 AM, P Kishor wrote:
> Actually, there can be one bad effect of Darren's suggestion, now that
> I think of it, and that would be for those who don't care for strong
> typing. They will end up getting strong typing for all non-UNIVERSAL
> columns whether they like it or
On Nov 5, 2009, at 5:15 PM, Beau Wilkinson wrote:
> I really think this warrants further discussion. Perhaps the correct
> answer (that ARMs implement a non-standard FP type which is
> incompatible with Sqlite) is already out there, but I think the
> issues I raised with that answer should
On Dec 13, 2009, at 3:16 PM, Alexey Pechnikov wrote:
> As we can see, the unique index can check equlity of REAL values
> but the "=" operator can not. it's fantastic I think :-)
The problem is not the "=" operator...
sqlite> create table test (save_date REAL unique);
sqlite> insert into test
On Jan 4, 2010, at 6:35 AM, sasikuma...@tcs.com wrote:
> I'm using SQLite DB version 3.6.12. I recently read about the feature of
> In-Memory Database and tried to implement it. I was able to create a new
> DB connection in memory, able to create a table and insert some set of
> records into
On Feb 15, 2010, at 1:43 PM, Roger Binns wrote:
> Shane Harrelson wrote:
>> I'm looking at how this can be improved.
>
> It seems that everyone else is converging on using David Gay's dtoa.c
We've been "converging" for a few years!
On May 18, 2010, at 4:14 AM, Sylvain Pointeau wrote:
> but is it 64 bits? or do I have to add a special option?
Last time I built a Universal Binary sqlite3 on OS X (March 2010 3.6.22) I had
to
CFLAGS='-arch i686 -arch x86_64' LDFLAGS='-arch i686 -arch x86_64' ./configure
On Oct 23, 2012, at 4:58 PM, Igor Korot wrote:
> 1. I know on Mac I need to build an application bundle. Where do I
> store the .db file relative to the bundle?
> Inside it? Home directory? Somewhere on the hard drive? What is the
> usual place for it?
If the database is
On Mar 7, 2013, at 11:07 AM, Ryan Johnson wrote:
>
> That does leave the question of what to do with cast ('1.0' as integer),
> though. Without the prefix-based matching that would now return NULL rather
> than 1, even though cast(1.0 as integer) would still
> I'm unable to reproduce the problem using C. Maybe it is in lsqlite3.
Yes, lsqlite3 still uses the old sqlite3_prepare() API to maintain
compatibility with some legacy systems. It is long past time that it should
have changed to use sqlite3_prepare_v2().
Running Richard's example with
On Sep 10, 2013, at 6:23 PM, Scott Robison wrote:
> I think I prefer something along the lines of "unlikely" or "likely". The
> problem with a term like "selective" (at least in my brain) is that it
> doesn't imply (for the single argument version) in what way it is
> Your suggestion was to reconstruct the index from original
> table data on a rollback. For a large transaction that touches
> most pages of the index, this can give (at best) a 2:1 speedup.
> But the other side, the potential slowdown is extreme.
Yeah, there is that drawback. Other DBMSs avoid
My uses of SQLite are multithreaded (mostly) single process. So, an
approach that would appeal to me is "client-server" where the server
is a thread in my process, and the clients are other threads. Adding
a lock manager to the server thread would permit fine grained locking
with ACID properties.
> Please, give me some examples of the kinds of things you are
> doing which could benefit from improved concurrency.
One typical application for me is data recording for regulatory
compliance (FDA 21 CFR 11). Instruments are polled or issue data
frequently, say once a second. Data from several
It looks to me that several users are (a) in a uniprocess environment,
and (b) inventing their own SQLite db access synchronization code. An
SQLite fine grained lock manager for threads in a single process would
address these same issues, with better concurrency as well.
Jay said:
> All database
Thursday, November 27, 2003, 10:19:22 PM, Dennis Volodomanov wrote:
>> and sqlite_decode_binary() wants an unsigned char. Can you help me
>> and tell me what to do in order to supply sqlite_decode_binary()
>> with the data it wants in a correct fashion?
> Well, I did just cast it to an unsigned
I had to change test4.c line 18, adding "OS_UNIX==1"...
#if defined(OS_UNIX) && OS_UNIX==1 && defined(THREADSAFE) && THREADSAFE==1
After that change, it built and the test ran (although it didn't run
any thread test cases, just skipped them). This is on Windows with
mingw/msys.
e
Friday,
Eugene,
> create table test(a int, b datetime);
> insert into test values(1,'2004/1/3');
> select * from test where date(b)='2004/1/3'
> The SELECT statement returns no record.
But this works:
sqlite> select * from test where b='2004/1/3';
1|2004/1/3
The date is not encoded properly in the
See: http://sqlzoo.net/
A Gentle Introduction to SQL
e
Wednesday, January 14, 2004, 2:22:23 PM, you wrote:
> Been all through the wiki and didn't find any
> first-time-get-you-started-basic-how-to. Thanks though.
-
To
Monday, March 22, 2004, 1:46:00 PM, Mark wrote:
>> I have run experiments to see how much faster SQLite might
>> work if it didn't invalidate its cache so quickly. The
>> answer is about 15%. So it is probably worth looking into
>> someday. Note that such a change will be backwards but
>> not
Thursday, March 25, 2004, 1:33:03 AM, Rohit wrote:
> I was going thru the pager source code ( pager.c ). The comments include
> references to "Journal", "Transaction Journal", "Checkpoint Journal". What
> is the difference between the three? Am I missing something?
There is only one journal
Here is what I did to try to recreate your problem after building the
sqlite dll with the usual ../sqlite/configure make procedure.
I downloaded the C/C++ magazine March example file, and extracted
Owen.txt. I cut example 'Listing 2: C API example' and commented out
the redundnant defintion of
> way, the mapping table would be the responsibility
> of the pager layer which (up until now) has known
> nothing about the btree layer. But with this approach,
> the pager layer would need to call the btree layer
> recursively. Thinking about that is starting to
> make my head spin.
> Does
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