Hi,
I come across database file locking error while trying below case with
Update.
Case: One process is updating a Colum periodically other process is
selecting same Colum or other colum in table periodically for read.
What is the best way to handle so that Update will not get locking error?
On 08/26/2013 01:37 PM, techi eth wrote:
Hi,
I come across database file locking error while trying below case with
Update.
Case: One process is updating a Colum periodically other process is
selecting same Colum or other colum in table periodically for read.
What is the best way to handle so
Thanks.
I tried using PRAGMA jouranl_mode = WAL but still it is getting failed for
some time. Find below more details.
Process 1:
Fun_Open()
sqlite3_open(DATABASE, dbUpdate);
sqlite3_exec(dbUpdate, PRAGMA jouranl_mode = WAL, NULL, NULL, sErrMsg);
Fun_Update() on TblTest
/* Do the periodic
On Mon, 26 Aug 2013 13:32:42 +0530, techi eth techi...@gmail.com
wrote:
PRAGMA jouranl_mode = WAL
That's misspelled, both in your text and in your code.
Try:
PRAGMA journal_mode=WAL;
You only have to do this once, e.g. at database creation.
Journal mode WAL is a persistent property of the
Oppps. Apologies for my mistake.
My test is working correctly now.
Thanks a lot.
You only have to do this once, e.g. at database creation.
Journal mode WAL is a persistent property of the database file.
Every connection will respect it.
All PRAGMA Option is attached to database as a
You only have to do this once, e.g. at database creation.
Journal mode WAL is a persistent property of the database file.
Every connection will respect it.
All PRAGMA Option is attached to database as a persistent property?
No, only the ones which are persistent. Journal_mode is
Hi, Richard,
I myself wrote:
Von: sqlite-users-boun...@sqlite.org [mailto:sqlite-users-boun...@sqlite.org]
[snip]
(2) SQLite version 3.8.0 allows for longer windows pathnames up to
3*MAX_PATH bytes, which is 3x more space that was allowed before.
This is still not 32K but might be
I'm a SQL novice, and occasional sqlite user. I'm trying to do a simple
database update from a bash script. It seems to me that I should be able to
do something like this from the command line:
cat file.xml|sqlite3 database.db 'update table1 set column3=? where
column1=some name;'
That's it, I'm
Hello
Please see the source code at the bottom.
It represents custom NOCASE collation to be used with iOS, i.e. it is
registered as
int rc = sqlite3_create_collation(db, NOCASE, SQLITE_UTF8, 0,
sqlite3_collate);
Main reason for this collation is the performance. It uses ascii comparison
if
On 26 Aug 2013, at 16:14, luis montes wrote:
It seems to me that I should be able to
do something like this from the command line:
cat file.xml|sqlite3 database.db 'update table1 set column3=? where
column1=some name;'
That's it, I'm trying to update column 3 on a particular record with
On 26 Aug 2013, at 9:02am, techi eth techi...@gmail.com wrote:
Fun_Read() on TblTest**
/* Do the periodic read operation by using db handler return from above*/
How is your read done ? Do you use _exec() like you do for the PRAGMA, or
_prepare(), _step(), _finalize(), or _query() or
O'Reilly just started a 50%-off sale on all ebooks (60% on orders of $100
or more), good through Sept. 10. A good chance to pick up these or anything
else, SQL-oriented or otherwise.
The discount code* *is B2S3 (but is also shown on the website).
Gerry
*
*
On Thu, Jul 18, 2013 at 5:31 AM,
On 26 Aug 2013, at 4:44pm, Jan Slodicka j...@resco.net wrote:
int rc = sqlite3_create_collation(db, NOCASE, SQLITE_UTF8, 0,
sqlite3_collate);
As a risk, I see overriding an existing collation name as risky. If any
application makes changes to the database without the extension loaded,
Thanks, Simon.
As a risk, I see overriding an existing collation name as risky. If any
application makes changes to the database without the extension loaded,
you're going to get corrupt indexes. Can you instead make up a new
collation name ?
I did not think about this, but in our case it
I recommend this free online class from Stanford:
Introduction to Databases https://www.coursera.org/course/db
It's pretty comprehensive (but not too in-depth) if want to get started
with database theory.
Here's the syllabus copied from the website:
This course covers database design and the
Hi all,
I had downloaded the SQLite ver 3.8 code base from the
SQLite website. In the documentation they say that it supports Unix
(Linux, Mac OS-X, Android, iOS) and Windows (Win32, WinCE, WinRT). I
would like to port SQLite to uITRON RTOS. Is it possible to port the
code to an
On 8/26/2013 11:58 AM, Simon Slavin wrote:
On 26 Aug 2013, at 4:44pm, Jan Slodicka j...@resco.net wrote:
int rc = sqlite3_create_collation(db, NOCASE, SQLITE_UTF8, 0,
sqlite3_collate);
As a risk, I see overriding an existing collation name as risky. If any
application makes changes to
On 8/26/2013 11:44 AM, Jan Slodicka wrote:
if( nKey1==nKey2
((UInt8*)pKey1)[0]==((UInt8*)pKey2)[0] memcmp(pKey1,pKey2,nKey1)==0 )
return 0;
There's a problem here when comparing empty strings, that is, when nKey1
== nKey2 == 0. Why are you comparing elements at index 0 explicitly?
FWIW: If you build a database using NOCASE version 1, then try to use the
database with a different NOCASE version X where X1, the database will
appear to be corrupt, since the order of the indices will be incorrect.
However, you can easily fix this by running REINDEX. That is what the
REINDEX
What Simon says extends to another case: if you change the visible behavior
of that function, even if it's a necessary bug fix, you end up with broken
indices.
That's true for every collation sequence, though.
If I interpret your code correctly, however, the user can switch the
preferred
On 26 Aug 2013, at 6:16pm, Igor Tandetnik i...@tandetnik.org wrote:
Furthermore, the collation depends on the system locale. If the system locale
changes, that could similarly lead to corrupted indexes. Not sure how much of
a concern that is with iOS
System locale is a simple setting made
You can see that e.g. with a select statement:
create table test ( Name TEXT, Age Int);
INSERT INTO Test VALUES ('Klaus', 22);
INSERT INTO Test VALUES ('Meier', '022');
SELECT * FROM Test WHERE Age=22;
In this case, the comparison is made on integers, '022' converted to integer
On 08/26/2013 11:10 PM, Jan Slodicka wrote:
Thanks, Simon.
As a risk, I see overriding an existing collation name as risky. If any
application makes changes to the database without the extension loaded,
you're going to get corrupt indexes. Can you instead make up a new
collation name ?
I
luis montes wrote:
I'm trying to do a simple database update from a bash script. It seems
to me that I should be able to do something like this from the command
line:
cat file.xml|sqlite3 database.db 'update table1 set column3=? where
column1=some name;'
Escaping arbitrary data in a file
On 8/26/2013 1:26 PM, _ph_ wrote:
Should AD + ZV really compare as a A + DZ digraph +V in the
respective language? I am not sure about the intended behavior, but it seems
strange. (OTOH, language. It's always strange.)
In Hungarian, yes, that's what happens.
Anyway, I would definitely
What is relevant is not determined by the type of the object, but by
the task at hand, in other words by the comparator.
No. There is only one meaning of equal. Two things are either
equal or not. How to compare them is determined by only their type.
You are correct, James, types are
In Hungarian, yes, that's what happens.
I shouldn't be surprised :)
I liike up digraphs
(http://en.wikipedia.org/wiki/Digraph_(orthography)#Digraphs_in_Unicode) and
found at least some of them have unicode code points. But if you can't cover
all, yeah, normalization won't help.
(btw.
On 8/26/2013 4:28 PM, _ph_ wrote:
(btw. Muenster / Münster would fall back to full comparison due to the ü)
Yes, but if you want to create a collation that sorts Muenster next to
Münster, then that collation would also need to sort Muenster after,
say, mug or mule.
--
Igor Tandetnik
For read operation i am doing _prepare(), _step(), _finalize().
For all other operation i am doing _exec().
Do you see any issue ?
Cheers -
Techi
On Mon, Aug 26, 2013 at 9:22 PM, Simon Slavin slav...@bigfraud.org wrote:
On 26 Aug 2013, at 9:02am, techi eth techi...@gmail.com wrote:
What is possible cause of I/O error in sqlite3?
My application is running fine on Desktop PC.Same application when I try to
run on ARM target it is giving I/O error.
sqlite3 on Host : 3.7.9
sqlite3 on Target : 3.7.14.1
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sqlite-users mailing list
I have got the reason for I/O error:
It is due to PRAGMA journal mode WAL. If I run with default journal mode
then application is working fine.
In above case what is the system architecture requirement to get WAL mode
enable?
How do I can achieve better concurrency in terms of reading?
Thanks.
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