We (Wikimedia) are observing SQLITE_BUSY errors in our integration
testing. The integration test consists of having a single browser
instance view a MediaWiki site which uses SQLite 3.8 for its backend.
The browser sends several parallel requests for CSS, JS, etc., and
MediaWiki writes to the
On 18/02/15 14:46, Richard Hipp wrote:
> I'm guessing that running "PRAGMA busy_timeout=4000;" (or some other
> reasonable number of milliseconds) shortly after opening the
> database connection will likely cure your problem.
> https://www.sqlite.org/pragma.html#pragma_busy_timeout You might
>
On 02/18/2015 06:53 AM, Tim Starling wrote:
> We (Wikimedia) are observing SQLITE_BUSY errors in our integration
> testing. The integration test consists of having a single browser
> instance view a MediaWiki site which uses SQLite 3.8 for its backend.
> The browser sends several parallel requests
Hello,
When I execute a query that has a subquery behind a comparison operator
in its where-clause and the subquery returns an empty result, then the
result of the complete query is exactly how I want it: also an empty
result. Can I assume that this behaviour will stay the same in next
gunnar wrote:
> When I execute a query that has a subquery behind a comparison
> operator in its where-clause and the subquery returns an empty result,
> then the result of the complete query is exactly how I want it: also
> an empty result. Can I assume that this behaviour will stay the same
> in
Thanks a lot Clemens!
I will use your suggestion and add the 'UNION'.
Then I only need to make sure that the comparison "[some number] > NULL"
in my WHERE clause always return an empty set.
Thanks again!
Gunnar
Gunnar Harms
T +31 (0)20 53 53 487
F +31 (0)20 42 08 852
I www.hiqinvest.nl
HiQ
On Wed, 18 Feb 2015 10:23:16 +0100
Clemens Ladisch wrote:
> gunnar wrote:
> > When I execute a query that has a subquery behind a comparison
> > operator in its where-clause and the subquery returns an empty
> > result, then the result of the complete query is exactly how I want
> > it: also an
Eduardo Morras wrote:
> Clemens Ladisch wrote:
>> ... WHERE cb_seq_num > (
>> SELECT cb_seq_num
>> FROM ordercallback
>> WHERE cb_uuid=@CBUUID
>> UNION ALL
>> SELECT NULL -- at least one result
>> LIMIT 1) -- at most one result
>
> Shouldn't add an ORDER
The subquery will always return one result or no result. So I only have
to UNION it ALL with the SELECT NULL part.
(I still have to refresh my memory how UNION ALL exactly works since I
never used it and only know it from college long time ago :) I cannot
imagine, but when it incurs a
gunnar wrote:
> The subquery will always return one result or no result. So I only
> have to UNION it ALL with the SELECT NULL part.
>>> Clemens Ladisch wrote:
... WHERE cb_seq_num > (
SELECT cb_seq_num
FROM ordercallback
WHERE cb_uuid=@CBUUID
Apologies in advance folks, please forgive the question and the formatting.
I have around 650,000 recipes and through lots of study have more or less
determined that the table structures below will give me a reasonable
normalised database.
That is not to say that it is perfect, but it is a
Ah indeed!
thanks!
On 02/18/2015 12:22 PM, Clemens Ladisch wrote:
> gunnar wrote:
>> The subquery will always return one result or no result. So I only
>> have to UNION it ALL with the SELECT NULL part.
Clemens Ladisch wrote:
> ... WHERE cb_seq_num > (
> SELECT cb_seq_num
AFAIK, you can't do 'nested insert', or, insert to multiple tables in one
call. Not from a single command line, or, from a view. You're pretty much
stuck with updating one table at a time.
It would be nice, however, problems can come up with a many-to-many
situation where the engine isn't sure
Hi,
I'm not an sqlite expert but in general I think you can insert in the
tables one by one, but in the right order. And make sure the different
inserts per recipe belong to one transaction (if one fails, the previous
are rolled back automatically).
You should probably also study
Thanks Stephen. At least I know now so I can go ahead and create my inserts
from data from the form. I just have to be careful to make sure they are
done in an efficient order with the data in the right place.
The category one I have to be careful of as it isn't in a list control but a
string
On 18 Feb 2015, at 11:38am, Flakheart wrote:
> I can deal with single table inserts but I think this would be some sort of
> nested insert statement?
There are no statements in SQL which can modify more than one table. So you
will need to use a number of commands, one for each table.
I suspect that this is wrong as nobody has suggested it but isn't this what
triggers are meant to solve?
Staffan
On Wed, Feb 18, 2015 at 2:13 PM, Simon Slavin wrote:
>
> On 18 Feb 2015, at 11:38am, Flakheart wrote:
>
> > I can deal with single table inserts but I think this would be some
In a feeble effort to do "marketing", I have revised the "Appropriate
Uses For SQLite" webpage to move trendy buzzwords like "Internet of
Things" and "Edge of the Network" above the break. See:
https://www.sqlite.org/whentouse.html
Please be my "focus group", and provide feedback, comments,
In global.c:
#ifdef SQLITE_EBCDIC
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, /* 0x
*/
16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, /* 1x
*/
32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, /* 2x
*/
48, 49, 50, 51, 52, 53,
I would mention the open source statistical language R in the "data
analysis" section. The interface in the RSqlite package is much better and
faster than any of the Python interfaces in that the interface fully
understands queries as tables and that the looping for the return of rows
is done in
On 2/18/15, Jim Callahan wrote:
> I would mention the open source statistical language R in the "data
> analysis" section.
I've heard of R but never tried to use it myself. Is an SQLite
interface built into R, sure enough? Or is that something that has to
be added in separately?
> The
On Wed, 18 Feb 2015, Richard Hipp wrote:
> Please be my "focus group", and provide feedback, comments, suggestions,
> and/or criticism about the revised document. Send your remarks back to
> this mailing list, or directly to me at the email in the signature.
Richard,
It is clear and well
On Wed, Feb 18, 2015 at 8:53 AM, Richard Hipp wrote:
> On 2/18/15, Jim Callahan wrote:
> > I would mention the open source statistical language R in the "data
> > analysis" section.
>
> I've heard of R but never tried to use it myself. Is an SQLite
> interface built into R, sure enough? Or is
Hello.
We're trying to use sqlite on an embedded linux with one process regularly
writing entries in a db and another process removing the entries by batch.
It works fine on the first boot, however after stopping and relauching the
processes I start to get errors on all sides: the reader gets
On 18 Feb 2015, at 4:09pm, Gillot Lamure Leo (Consultant) wrote:
> We're trying to use sqlite on an embedded linux with one process regularly
> writing entries in a db and another process removing the entries by batch.
What file system does the volume with the database file on use ?
> It
On 2/18/15, Gillot Lamure Leo (Consultant)
wrote:
> Hello.
>
> We're trying to use sqlite on an embedded linux with one process regularly
> writing entries in a db and another process removing the entries by batch.
> It works fine on the first boot, however after stopping and relauching the
>
We use sqlite as the db engine inside a server application
with a number of clients that connect to the server.
Sqlite works just beatiful here and I wish these statements
"sqlite shall not be used for client/server things" would be
worded less generally. In fact when we mention sqlite as our
db
I second this notion. I think SQLite is uniquely suited to server based
applications of all kinds. Its light footprint and the fact that it's a
library rather than a full system gives it a flexibility and raw
performance that other systems cannot. We use it at the core of each node
in a
Greetings!
I have this table
CREATE TABLE LSOpenJobs
(
id integer primary key,
ProjID integer,
PSubClass,
lang,
ProjFund,
RateType
);
Imagine this set of records...
171421|132959|DOC-Trans|DE-DE|860.69|PER-WORD
171422|132959|DOC-Trans|ES-LA|624.96|PER-WORD
On 2/18/15, Darko Volaric wrote:
> The only thing I'd change about SQLite is the SQL bit.
Most people agree that the SQL language is a bit of a mess. But so is
the Qwerty keyboard layout. The problem is that the improvement you
get by moving to something else is less than the pain of making
On 2/18/2015 2:36 PM, Jose I. Cabrera wrote:
> these are my two steps:
> 1. SELECT RateType FROM LSOpenJobs WHERE ProjID=132959 AND PSubClass='PM' AND
> lang='DE-DE';
What is the point of this step? I don't see where and how the value you
obtain therefrom is required for step 2.
> 2. Use the
-BEGIN PGP SIGNED MESSAGE-
Hash: SHA1
On 02/18/2015 11:43 AM, Richard Hipp wrote:
> but I think the truth is we are probably stuck with SQL for a while
> yet.
In theory there could be an intermediate representation form (like
compilers do) that is publicly available, with the (now
On 2/18/2015 3:59 PM, Igor Tandetnik wrote:
> On 2/18/2015 2:36 PM, Jose I. Cabrera wrote:
>> these are my two steps:
>> 1. SELECT RateType FROM LSOpenJobs WHERE ProjID=132959 AND
>> PSubClass='PM' AND lang='DE-DE';
>
> What is the point of this step? I don't see where and how the value
> you
On Feb 18, 2015, at 3:13 PM, Roger Binns wrote:
> -BEGIN PGP SIGNED MESSAGE-
> Hash: SHA1
>
> On 02/18/2015 11:43 AM, Richard Hipp wrote:
>> but I think the truth is we are probably stuck with SQL for a while
>> yet.
>
> In theory there could be an intermediate representation form
On 2/18/2015 4:19 PM, jose i cabrera wrote:
> I need to know what the percentage for this specific project ID, 132959,
> and language is going to be calculated. This may be different depending
> on the project. So, it may be 3%, 5%, 10%, 20%, 25%, etc. That is my
> problem, I don't know how to
On 2/18/2015 4:37 PM, Igor Tandetnik wrote:
> On 2/18/2015 4:19 PM, jose i cabrera wrote:
>> I need to know what the percentage for this specific project ID, 132959,
>> and language is going to be calculated. This may be different depending
>> on the project. So, it may be 3%, 5%, 10%, 20%, 25%,
I agree with you, and am not suggesting getting rid of it, but rather
making it "pluggable" like many parts of the back end.
Right now, roughly speaking, I'm doing: logical form -> SQL -> execution
of logical form, and SQL seems to me to just be an arbitrary hoop that I
have to jump through,
On 2/18/2015 5:10 PM, jose i cabrera wrote:
> So, in reality, all the tasks of the project of
> like "lang" minus the PM, have to be added and 10% of that total be
> calculated to the (on this instance) DE-DE PM task.
UPDATE LSOpenJobs SET ProjFund =
(
SELECT round(sum(t2.ProjFund) *
I think that IR would be something like first order predicate logic, to
which SQL and the relational calculus is closely related. Now that we have
WITH and recursive queries, you've basically got a bottom-up evaluation of
the declarative subset of Prolog (if you ignore issues relating to logic
On 2/18/2015 6:48 PM, Igor Tandetnik wrote:
> On 2/18/2015 5:10 PM, jose i cabrera wrote:
>> So, in reality, all the tasks of the project of
>> like "lang" minus the PM, have to be added and 10% of that total be
>> calculated to the (on this instance) DE-DE PM task.
>
> UPDATE LSOpenJobs SET
Thanks Gunnar. Having never used foreign keys before, I am up for a lot of
reading. Hope this isn't beyond me:):)
--
View this message in context:
http://sqlite.1065341.n5.nabble.com/Complex-insert-query-to-normalised-database-tp80590p80620.html
Sent from the SQLite mailing list archive at
But the great thing about SQLite is you don't have to go logical form in
light weight apps.
http://search.cpan.org/dist/ORLite/lib/ORLite.pm
ORLite does a half-and-half approach that generates the easy parts of the
SQL with very little code, but avoids the code weight needed to generate
all of
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