At 03:14 14/12/2014, you wrote:
´¯¯¯
I take the point that the only possible improvements seem to need
alteration to the file structure or added maintenance which may use up
cycles for something that just isn't that important to DB use in
general - and I have to agree, I too have zero want for
Hi Simon,
A) In that sqlite_sequence table you mentioned, as an additional
column. Always up-to-date.
But sqlite_sequence isn't always created. AFAIK it only exists when one
or more table exists with an integer primary key autoincrement.
B) In the tables prepared by SQLite ANALYZE. If
select 7,915 - 5,021
is:
select 7, 915 - 5, 021
giving
7 91021
just like
select 'a', 915 - 5, 'b'
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At 21:53 24/09/2014, you wrote:
If the default cannot be represented exactly, its rounding will be the
least of the difficulties.
Not always: in scientific applications I've had column values default
to plenty of irrational numbers: fractions of pi, sqrt(2.0) etc.
My main gripe is when
Dear forum,
MySQL does it too unless ERROR_FOR_DIVISION_BY_ZERO mode is enabled:
http://dev.mysql.com/doc/refman/5.0/en/arithmetic-functions.html
SQL Server does it too unless SET ARITHABORT is ON:
http://technet.microsoft.com/en-us/library/aa259212(v=sql.80).aspx
PostgreSQL doesn't do it,
What the SQL standard calls an exception is not necessarily exactly
the same as an exception in other programming languages.
Granted.
If SQLite were to change the division-by-zero handling, it could be
reported exactly like most other errors, by returning SQLITE_ERROR from
sqlite3_step().
This would means that if ever an SQL statement encounters divide by
zero, the application will crash with no way handle the situation
gracefully, nor to locate the source of the problem.
Seriously, what are you talking about? Why is there no way to handle
the error, gracefully otherwise?
How to improve the write speed then.
I've found that in most cases using chained insertion speeds up
things dramatically:
insert into mytable (x, y, z) values (1, 2, 3), (4, 5, 6), (7, 8, 9), ...
If you insert K rows at a time this way your total insert time can by
cut by a significant
Conversion of oversized hex into FP would break easily and reveal
hardly reproductible across many platforms. Being a support for some
languages fora I observe daily how FP inaccuracies is a real-world
problem in simple-looking code.
The only reasonable thing I can foresee is treat hex as
At 22:36 18/05/2014, you wrote:
The more I
think of it, though, I think that the solution is as simple as converting
all letters to lower(/upper) case and converting all whitespace to a
single
space each, except for within matching [ ], , ' ' or ` `. After that, I
can do a memcmp().
You're
It's how RAID5 works. Check this page docs http://baarf.com/ about it.
This is utter BS.
Serious RAID controllers perform parallel I/O on as many drives that
are making up a given array. Of course I'm talking of SAS drives here
with battery backed-up controller.
Kid sister RAID5-6
At 21:35 03/03/2014, you wrote:
´¯¯¯
RAID3-4-5 was great when disks were expensive, in 80's an 90's. Now
not. A minimal RAID5 needs 3 disks. A minimal RAID10 4. An enterprise
disk SAS 15Krpm 146 GB 6G is $350, and a not enterprise grade cheaper
and bigger. Now RAID1E and RAID10E give more
Perhaps you want:
select * from (
select * from A where x in (subselectA)
left outer join (
select * from B where y in (subselectB)
) as a
on -- something
) as A1
UNION ALL
select * from (
select * from B where y in (subselectC)
left
Dear list,
I'm trying to find the correct syntaxt for this, but I hit a syntax
error each time: either SQLite shokes on outer parenthesis or on union all.
(
select * from A where x in (subselectA)
left outer join
select * from B where y in (subselectB)
)
union all
( -- -- error
select *
At 08:45 11/12/2013, you wrote:
My case wasn't about messing anything up, but simply moving a document.
Just like moving the canvas while the artist is painting? Or is it
moving the notebook while the schoolkid writes on it?
This is prone to produce dribbles or worse, in my view. I fail to
How so? An AFTER INSERT trigger has the value in new.yourPKColumn. Can
you show a scenario where this is insufficient, and a hypothetical
last_insert_primary_key would save the day?
You're correct, there is no situation where such a thing would make sense.
At 15:45 15/11/2013, you wrote:
last_insert_rowid() is needed for autoincremented keys.
WITHOUT ROWID tables do not have an autoincrementing key. Your program
has to generate or get the key in some other way, so it knows the value
even before the record is inserted.
last_insert_primary_key
Search the Internet for an SQLite extension called unifuzz.c and see
if that does what you want in the way of character folding. I have a
copy of the code on my other computer if you cannot find the original
authors original code.
Here is the download link:
There are perhaps 2 million applications in the wild that use SQLite,
so it
will be difficult to check them all. But one can easily imagine that
one or
more of those two million applications does something like this:
SELECT current_timestamp, * FROM tab;
And then runs sqlite3_step()
There are other ways to get a consistent 'now' across an entire SQL
statement:
Of course!
This issue is sufficiently obscure that it is not worth adding (and
testing
and documenting and supporting forever) yet another pragma.
I personally wouldn't call it so obscure as it pops up
At 05:49 04/07/2013, you wrote:
´¯¯¯
But in the bigger context of this discussion, I think SQLite might
consider a row_number() function, or (my personal preference) some
type of virtual column, such as _row_number_. I suggest that term,
since that's what Oracle, MS SQL Server, and
I would like to use INTEGER PRIMARY KEY, but I would like to disable
its implicit AUTOINCREMENT feature. Namely, if INSERT specifies value
of the column, I would like uniqueness to be enforced, but if NULL is
supplied, I would like the operation to fail instead of advancing key
to a new
I've been talking with Bogdan about a change to SQLite Expert and ran
across something I did NOT expect.
I have this schema:
CREATE TABLE [tApplicationPaths] (
[AppID] INTEGER PRIMARY KEY,
[ApplicationName] CHAR,
[ApplicationMonitorPath] CHAR,
[SearchSubDirs] BOOL DEFAULT 1,
While Keith is closer to the right explanation than I was, there are a
couple of points:
default does not need a constant: a function call is valid as well,
e.g. date()
The syntax:
CREATE TABLE tApplicationPaths (
AppID INTEGER PRIMARY KEY,
ApplicationName CHAR,
ApplicationMonitorPath
For me this inserts the text 'AppID' ...
Sorry my bad, I tried a dummy table but made the type integer not char.
So it was displaying 0 but hold text indeed. It's too late here for me
to post anything, must be age!
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At 07:31 03/05/2013, you wrote:
Problem is, how do I prove to the customer/user that it is working as
expected no matter what?
There are two important points in your question.
The second (!) is prove.
The first is as expected.
Let me expand on why. For a system (irrespective of its nature
Hi Max,
The link is dead. I'd like to know more about this so can you provide
us with a live link?
Thanks.
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... so I think you must be using a really old copy.
That's correct: I downloaded this source years ago.
And yes, argc for SQLite functions has a different semantics from main().
Thanks for the heads up.
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At some point in time I needed a few math functions and tried to use
the contributed maths extension. I found a couple of mistakes, mostly
sqrt() requiring two arguments, and something else I can't remember
right now. That by itself may indicate that the math functions never
went into full
At 15:46 25/03/2013, you wrote:
´¯¯¯
The sqrt() function takes only one argument, at least.
It checks assert( argc==2 ); at line 503 AFAIK.
This library also contains several string functions, but it is meant
as a general extension library, not a math specific library.
I have my
At 23:12 23/03/2013, you wrote:
´¯¯¯
Here's how to reproduce it:
- Get the latest sqlite shell for windows:
http://www.sqlite.org/2013/sqlite-shell-win32-x86-3071600.zip
- Download and extract this database:
https://dl.dropbox.com/u/242199/db.zip
- Run this query: SELECT rowid FROM ad_text
Raymond,
So I checked some server/client solutions from
http://www.sqlite.org/cvstrac/wiki?p=SqliteNetwork. But as there wasn't a
solution that supported my script
language (Autoit) I ended up writing my own server/client solution. This
worked for me, but I still have some questions regarding
Jay A. Kreibich wrote:
I can also see situations when someone might want to run one
set or the other set of checks. Breaking it out, so that these
checks are done by a different PRAGMA (integrity_check_v2 ?) seems
like a wise idea.
Indeed; with a separate PRAGMA
Ok, but where are the large number of tools that would do that?
Features:
- very fast, very basic spreadsheet (not based on Excel or
Libre/OpenOffice)
- saves data in SQLite
- very easy to create new tables + columns
- lets the user edit rows/columns as easily as in Excel
- data can be sorted
Let's see.
100.000 licenses @ $20 = $2.000.000
Cayman S = $65.000
www.gizmag.com/porsche-cayman/25260/
= 30 cars.
Kim Dotcom! :-)
What are those $20 suppose to pay for?
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Hi, I there any application/program paid or free that will allow me to
connect to a remote shared host sqlite DB. A program which will allow
me to make changes to the db design and do backups. I have very little
control on the shared host. I am hoping for something that will let
me connect
Also it suggests that transaction was began as read-only (with a
select statement) and then there was attempt to transform it to a
writing transaction (with insert, update or delete statement) when
there was another writing transaction in progress waiting for this
transaction to finish.
and
I've downloaded and compiled icu.c according to the instructions in
the included README (though I had to add -fPIC to the compiler options).
Now, when searching a table, I'm not getting the kind of
diacritic-insensitive behavior I was expecting:
sqlite .load lib/libSQLiteICU.so
sqlite
What about if table name or column name contains that escape character?
Do I need to escape it in another way?
http://sqlite.org/faq.html#q14
This FAQ topic doesn't apply here. We're talking about schema names or
keywords, while FAQ#14 is literal escaping a single quote.
Given that we
This FAQ topic doesn't apply here. We're talking about schema
names or keywords, while FAQ#14 is literal escaping a single quote.
create table foobar ( baz );
select * from onetwo;
select * from sqlite_master;
table|foobar|foobar|9|CREATE TABLE foobar ( baz )
I knew this particular
At 13:55 16/05/2012, you wrote:
´¯¯¯
Those all work. You are getting an error because you didn't supply any
column in the table
`---
Oops, that's what happens when you try doing too many things at the
same time.
Nonetheless,
SQLite version 3.7.11 2012-03-20 11:35:50
Enter .help for
Not sure I buy your test cases.
I don't either, but for diverging reasons.
Fields containg double quotes must be in double quotes. So only one
of your examples is valid
first,second,third
I'll have to fix that one.
No, it's invalid. Apply to the same rules that apply to ' for
Hi Simon,
My test cases weren't intended to supply data, they're crash tests. I
have faith that Mike's software correctly interprets syntactically
correct cases. I was interested in making sure it didn't crash, hang
or spew on syntactic errors.
You're right.
JcD
I have a big database with timestamps and sensor readings, which I
access with SELECT to have gnuplot draw graphs. However, sometimes I
have readings every minute and want to plot several years of data, and
feeding everything to gnuplot is overkill. In these cases it would be
sufficient to
Hit Send inadvertandly, sorry.
My rowid isn't increasing with something predictable, so I can't do
something like WHERE rowid % n = 0. I can use WHERE random() % n = 0
giving me sort of what I want (better than row % n, but I still need
something better).
If your sampling is essentially
This is a good suggestion. A drawback is that the interval can't be
too small otherwise there is a risk that a sample would be missed. So
I will get more samples than I need. In you example, if there is a
sample every second more or less, I would usually get 3-4 samples
every hour instead of
But if data was added exactly in the same way/order shouldn't the
counters all count to the same end result if the process was repeated
at a later time on a another machine?
Maybe, maybe not. Since the file format specifies meaningful fields
only (my guess) it's quite possible that the
At 23:44 02/04/2012, you wrote:
I wonder whether it respects languages.
These don't, but u8_strcoll et al supposedly do, based on LC_COLLATE
locale category. Herein lies the problem: if you build an index using
these functions while running under locale A, then try to run queries
against
Do you feel that the platform - Hardware / OS / some other factor
could influence the way SQLite performed its sequence?
Instead of trying to compare the hashes of DB files themselves, you
appear to want a strict comparison of sets in the contents of the DBs.
For instance, changing the
Stephan,
Occasionally the sensor has a fault or the values are invalid (like
negative temperatures). To mark them once and for all as invalid, the
faulty values are replaced (in a C environment) by NaNs. Then the
data are
inserted into the database with a C porgram, in a loop with the
Hi Max,
Is there a way to know the number of parameters passed for user function
with undefined argument count (nArg = -1 in the Sqlite3_create_function
call).
I could not find a function specific to this task and thought that I at
least can check sqlite3_values array members for zero for my
CREATE UNIQUE INDEX IF NOT EXISTS 'userIdentityByUcgID'ON
'user_identity' (shortName ASC, ucgID ASC);
As a general rule you should reserve single quotes to string litterals.
Either leave schema names alone (no whitespace, not keyword) or use [my
pretty table], my favorite table, `my
I am using the newest version of SQLite. How do I enable support for
Cyrillic letters? Whenever I enter something in the DB with Cyrillic
letters it gets saved like this ??
This would happen if your Unicode Cyrillic text gets converted (read
emasculated) to ANSI using a non-cyrillic
You just need to convert it to UTF-8 before insert, then convert it
back when you pull the data.
UTF-16-UTF8 - insert
Select - UTF8-UTF16
There are 16-bit SQLite APIs for that, no conversion needed
actually. But of course it all depends of the wrapper you use, if any.
Me too. Either as a new standard way of working, or as something
which can be turned on and off with a PRAGMA. I accept that SQLite is
meant to be fast, but having SQLite spit out which check was violated
will result in my app running faster and more dependably than when I
build the same
At 01:08 17/01/2012, you wrote:
´¯¯¯
Richard, Simon, and you are seeing eye-to-eye on this. Earlier in the
thread (since trimmed, of course), it was stated that SQLite was
designed to be tiny so that each app could include the entire system
without draining resources significantly (this would
where `similarity` is a measure of overlap of `t` between each pair of
`c` and is calculated as the number of `t` common between a given pair
divided by the total number of unique `t` in the pair.
Just like Igor, I take unique `t` in pair to mean distinct `t` in pair.
I want the result
At 18:09 22/12/2011, you wrote:
DELETE FROM t WHERE rowid !=
(SELECT t2.rowid FROM t t2 where t2.num = t.num ORDER BY t2.date LIMIT 1);
Are you sure that date will collate correctly, as entries appear to be
in dd/mm/ format?
Dates in non_ISO format are always a pain. IMHO if dates are
If your statement is a SELECT returning 50 rows, and you've already
read 20 of them by the time you get the _BUSY, do you get the first 20
again after doing the _reset ?
I don't believe we can get _BUSY in the middle of a SELECT. Am I wrong?
Hi Simon,
Ah, so it's the first _step which does the locking, rather than the
_prepare.
That makes sense to me. If I had a serious application using, say, a
hundred of different prepared queries, I'd rather batch-prepare them
all up front then use them when needed without asking
question.
And it's convenient to be able to do the prepare during startup. I've
just never had to worry about this situation. It means you have to do
special handling for the first _step, but it's a reasonably compact
way of handling the potential problem.
I can't use prepared statements in
So I make up for it by using an 'exec' which executes only the first
command, and by hashing the command so that tampering with it would
make it fail the hash.
AFAIK sqlite3_exec will hapilly prepare and run more than one
statements in a row. I use it all the time.
But there's no reason
ID
1
2
3
4
11
12
13
14
If we have the 14 (we know to start at 14) can we select the records
14, 13, 12 and 11,
so the consecutive numbers, going down from 14?
Sure:
select id from yourtable where id = 14 limit 4 order by id desc;
so the consecutive numbers, going down from 14?
Sorry I interpreted the question in a dumb way. Igor is certainly
right (as usual).
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At 10:02 16/11/2011, you wrote:
Basically my problem is exporting the database so the time stamps
appear in
hex the data blobs appear in either text (ascii) or as a jpeg image
depending on the data in type field.
I have tried numerous sqlite browsers without success.
Looks like a job for
Loop for 61153 records start rowIndex at 0
sqlite3_prepare_v2 (SELECT id, blobdata FROM Table30KB Where id =
rowIndex)
sqlite3_step()
sqlite3_finialize()
End
Make that
sqlite3_prepare_v2 (SELECT id, blobdata FROM Table30KB)
Do
sqlite3_step() // handle errors somehow (busy, ...)
Until
SELECT name, color, Sum(price) AS price FROM key_table5 WHERE price
'2' GROUP BY color ASC ORDER BY name ASC LIMIT 50 OFFSET 0
when either ASC or DESC is used with the GROUP BY clause.
Is this a bug or a query statement inaccuracy on my part?
Looks like a documentation bug. Indeed the
Hi Pavel,
I can't answer this question. Maybe it's something like all operations
are successful but memory mapping is not actually shared between
processes. So every process sees its own copy and assumes that no
other process works with database, thus database can be corrupted in
many possible
Pavel,
This is not a local file. Even if you use your hostname as netname
file is still retrieved through network stack. And I guess SAMBA
doesn't work well with memory mapped files (in addition to all
problems with locking).
True but why did I get no error? Since MMF don't cope with network
Dear List,
If a DB in WAL mode is opened using a UNC path refering to a _local_
drive, weird things happen until the DB gets corrupted but AFAIK no
error code is thrown.
Windows doesn't seem to open the memory mapped file if it has a UNC path.
Can someone confirm?
I don't know if this
Does your path begin with 'file:' ?
No, simply
\\netname\share\path\test.db
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Is there a good practice /setting for such high rate of concurrent writes
with reads ?
I understand that multiple readers with single writer at any time t is the
model which sqlite has with various locks/states (unlocked, pending ,
shared
, reserved , exclusive).
with is a bit unclear.
To
At 21:46 05/11/2011, you wrote:
In my opinion spending $59 for the Pro version is a **no-brainer** for
many reasons.
Seconded! Time saved in few days pays back the ticket.
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On 30 Oct 2011, at 7:50pm, Abair Heart wrote:
Searching the archives implies, that sqlite expert hasn't been asked
about.
Has anyone tried it yet? Is the program safe? time-saving?
Give me the $59 and a Windows computer and I'll check it out.
Simon.
As a long-term fan user of SQLite
Fixed here:
http://www.sqlite.org/src/info/8f88cc4e61
If you use sqlite3_prepare_v2() to prepare the statement, the custom
error message will now be available after sqlite3_step() returns.
Many thanks Dan.
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Dear list,
It seems that after sqlite3_prepare_v2() and sqlite3_step() we have
that sqlite3_errcode() returns meaningful result right away when some
function invokes sqlite3_result_error() during sqlite3_step(). OK so far.
The issue is with sqlite3_errmsg(). If a function post an ad-hoc
Funny coincidence in time, I just posted on the same subject while your
post was being received!
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In my SQLite 3 Database, I have some records with Turkish characters
such as Ã, Ã, Ä° etc. When I select my values withÂ
SELECT * FROM TABLE ORDER BY COLUMN_NAMEÂ
query, the records that begin with these characters are coming at the end.
Bare bone SQLite only collates correctly on the
That is the default text for the error code, but your extension should
provide different text.
That's an half-backed solution. I know of no application which test
error codes AND THEN test error message _content_ before selecting a
way to deal with the error. Most of the times, the
Yoav Apter yo...@checkpoint.com wrote:
I have the following table:
CREATE TABLE x ('col1', 'col2', 'col3')
Create col1index on x ('col1')
When I run this query: select * from x where col1 is null I see
the index on x is used.
When I run this query: select * from x where col1 is NOT null
I have the need to use some math extension functions. While testing
them I found it very difficult to select an informative error code in
case of a domain error, like sqrt(-1).
Would it be sensible to create a new generic error code in some next
release for extension functions to report such
However, the precompiled Windows binary is currently only available as
a 32-bit library. I'd like to request that a precompiled Win64 Windows
binary be added to the list of standard build outputs and downloads
available from the sqlite.org site. This will be consistent with the
basic Win32
select * from TABLE where DATE between date('now','-7 days','Weekday 0')
and date('now','-7 days','Weekday 6');
Let me try this:
select * from TABLE where DATE between date('now','-6 days','Weekday 0')
and date('now','Weekday 6');
or compare week numbers (%W specification) [slower]
with an existing record, and a fieldname that is in a column that has
a UNIQUE INDEX, if I do sqlite_exec(UPDATE database SET
fieldname=sqlite_escape(get calculator batteries) WHERE
fieldname=sqlite_escape(get hp50g calc cells);
this code actually deletes the record. it should not. I don't
the test code can be seen at
http://www.autoitscript.com/trac/autoit/ticket/2012
Are you sure it is gone?
I'm not familiar with this API, but you appear to be finalizing the
query BEFORE you extract rows from it. In the native API, that's not
valid, making the code report no rows,
It's very easy to replace the SQLite functions with user-defined ones,
so if someone wants to go the easy way (partial support for just the
common western scripts) it's easy. And already done by many, if you
search the mailing list.
It's exactly what I'm looking for. It could be my
Most PRAGMAs, including others which modify engine behaviour like
recursive_triggers, are not stored in the database but have to be
restated every time you open the database file.
Ok, thanks, If that is the case for this PRAGMA I did not realise.
Similar to the page_count PRAGMA I would
BTW this pragma should be applicable to a list of tables or * for all
tables.
I realize I didn't state I was talking about recursive_triggers pragma.
Sorry for not having made this clear in the previous post.
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That is exactly the problem: such limits are app-specific logic, and that
3rd-party db manager cannot know about app-specific logic.
No, that is a metadata which belongs to the DB.
Forcing this pragma to always apply would in fact hinder some cases,
e.g. creating a backup copy of a table
Cool - can you please post a link to the sources?
Sure, here you are:
http://dl.dropbox.com/u/26433628/unifuzz.zip
The .c source contains all details (and all the bugs).
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Roberto,
Though I cannot use DLLs since it is an iPhone iOS (MacOSX)
operational system.
I made it DLL by default at build time since it fits my needs. You can
still compile the extension (or part of it) as a standard .o obj and
statically link it into your application.
I was hoping for a
I am using C# windows application(.Net2010) with sqlite, and i need
to change the database table.
Can you pls let me know, how to add or modify a new column/
table in
the existing Sqlite database that is in my client desktop machine.
I want the existing database to have its data, and
I try this function. Do you have Visual Studio. i show you my example.
NOCaut wrote:
char * unicode_to_1251(wchar_t *unicode_string)
Why are you converting Unicode to 1251? This is a lossy conversion in
the general case.
Work with Unicode strings end-to-end, using the UTF encoding of
Mattew,
Obviously I am not as well versed in sqlite as you are. I hate to
hate myself, but am still continuing with reading somewhat ancient
files into a somewhat cohorrent database.
Thanking you for your time and trouble,
Matthew
p.s. shame about the parsing of comma delimited
I understand that but why the same query, with the same data, return two
different result using different SQLite-based Win32 applications ?
SQL is essentially based on set theory. Sets don't have intrinsic
ordering and may be enumerated in whatever order. What you think are
distinct results
I want to make things clear. there are some rules in my system, such
as : process whose name is proc_host can see all the records, and
process whose name is proc_client1 can see all the records except
rowid 1.
First, keep away of relying on rowid values since they may change if
you don't
Michael,
Are you saying that 1 below doesn't show up in the first query result?
sqlite create table t(i int,name string);
sqlite insert into t values(1,NULL);
sqlite insert into t values(2,'two');
sqlite select * from t where i in (1,2,3,null);
i|name
1|
2|two
sqlite select * from t where i in
Cecil,
Is good enough for me. My only problem is that between reading the
data and
writing the changes, I want to be sure that no one has changed the data.
For me that is enough.
For this, a simple Begin immediate; ... Commit; embrassing you
read-modify-write block will do. Doesn't block
Cecil,
Do I understand it correctly that after a commit the database is writeable
again for others?
Yes.
In that case it is maybe better to do a:
*PRAGMA locking_mode = EXCLUSIVE;
*followed by an update of the database. As long as the application is
running, I want to be sure that
If you _need_ exclusiveaccess all along, then start app, begin
exclusive, do your stuf, commit and exit.
The 'problem' is that the application can run for the whole day.
Granted. And the 'problem' is ???
What I don't get is you later say it's a single-user, single-app
use. You don't
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