It took just a few minutes to start on that approach. I have the
necessary parse.y changes done and know what to do for the rest. Time
to subscribe to sqlite-dev...
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BTW, I might implement and contribute something like this. I'm free
to contribute any changes to SQLite3 that I make. I'd need some
guidance though. And what I cannot contribute is the high degree of
testing that SQLite3 is known for.
The parsing aspect of database triggers is simple enough. B
On Fri, May 6, 2011 at 4:30 PM, Simon Slavin wrote:
> On 6 May 2011, at 10:14pm, Nico Williams wrote:
>> Here's what I need:
>>
>> - at transaction time I need a way to record somewhere that the
>> transaction did start. This would mostly be an insert into a tabl
I really, really need transaction, not row, triggers. There's been
discussion of those here in the past (IIRC D.R. Hipp had a proposal
once).
Here's what I need:
- at transaction time I need a way to record somewhere that the
transaction did start. This would mostly be an insert into a table
w
On Tue, May 3, 2011 at 11:20 AM, Simon Slavin wrote:
> On 3 May 2011, at 5:09pm, Jay A. Kreibich wrote:
>
>> "Using SQLite" is today's "Ebook Deal of the Day" over at O'Reilly
>> Media. Today only (Tuesday, May 3rd) the ebook is 50% off, at
>> $15.99.
>
> Well I don't know, Jay. Have you read
On Sat, Apr 30, 2011 at 3:19 PM, Mike Power wrote:
> Does this exist in sqlite, my searching seems to indicate no. Sqlite
Right, SQLite3 doesn't ship with such a function.
> has the ability to import functions has someone already done the work to
> import a sha256sum function? How is that done
A quick test shows that, indeed, an INSERT OR IGNORE inside a trigger
that fails will not be ignored if the top-level statement has an OR
ABORT (or rollback, or fail) clause.
I can't imagine why one would ever want such behavior, but since I can
live with it (as shown below), I'll just conclude th
Long ago I noticed that the lang_createtrigger page says:
"An ON CONFLICT clause may be specified as part of an UPDATE or INSERT
action within the body of the trigger. However if an ON CONFLICT
clause is specified as part of the statement causing the trigger to
fire, then conflict handling policy
On Thu, Apr 28, 2011 at 5:20 PM, Dave Hayden wrote:
> On Apr 28, 2011, at 12:41 PM, Pavel Ivanov wrote:
>>> After more poking, it appears that rowids might not be changed by a vacuum
>>> if I have an index on the table. Is this true? If so, is it something I can
>>> rely on going forward?
>>
>>
On Mon, Apr 25, 2011 at 8:35 AM, Petite Abeille
wrote:
> On Apr 25, 2011, at 7:57 AM, Nico Williams wrote:
>> For group_concat(), however, this undefined order is
>> obnoxious.
>
> Seconded. As it stands, group_concat nondeterministic nature renders it
> useless for mos
As you might know, SQLite3 does not define the order in which
aggregate functions are applied to the values to be aggregated. For
traditional aggregation functions (min(), max(), ...) this makes
perfect sense. For group_concat(), however, this undefined order is
obnoxious.
Apparently MySQL has s
On Sun, Apr 17, 2011 at 11:44 AM, Petite Abeille
wrote:
> On Apr 17, 2011, at 6:33 PM, Nico Williams wrote:
>> Now, it's true that that's expected, but if all the application
>> "business" logic can be encoded in table constraints, indexes and
>> triggers
On Sun, Apr 17, 2011 at 3:36 AM, Kees Nuyt wrote:
>> Is there any way to persistently set certain PRAGMAs, so that they
>> need not be set every time a DB handle is opened?
>
> Many PRAGMA default valuess can be influenced using compiler flags
> SQLITE_DEFAULT_* .
I was mildly aware of those, but
Is there any way to persistently set certain PRAGMAs, so that they
need not be set every time a DB handle is opened?
Thanks,
Nico
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I've found pretty printers online and what not, but there seem to be
as many styles of pretty printing SQL as there are RDBMSes, and most
are awful to my eyes.
What might be nice is an external pretty-printer that you could pipe
the schema (and dump) to.
Nico
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On Mon, Apr 4, 2011 at 12:26 PM, Simon Slavin wrote:
> But he's combining two INSERTs into one. What I think he needs is first an
> INSERT OR FAIL to possibly add a new person, and then an INSERT ... SELECT
> which looks up that person's ID.
I didn't see that in the original post. Did I miss
On Mon, Apr 4, 2011 at 11:25 AM, Simon Slavin wrote:
> Probably not. Don't try to turn SQL into a procedural language. Do the
> SELECT that tells you whether the record exists and gives you the information
> you need if it does, then do whatever INSERTs you need to do.
I agree with the first
On Mon, Apr 4, 2011 at 9:10 AM, Enrico Thierbach wrote:
> I might have an exceptionally dumb day, but this sequence (from this post
> http://www.mail-archive.com/sqlite-users@sqlite.org/msg34082.html ) looks
> totally fine:
You're missing something: FTS4 is a virtual table and it re-enters
SQLi
On Mon, Apr 4, 2011 at 6:43 AM, Enrico Thierbach wrote:
> Is this really a bug? I at least wouldn't expect last_insert_rowid to be
> constant if the database gets modified.
If you read the post that Simon referenced you'll see that the caller
typically wants to know the row ID of the last row ex
On Sun, Apr 3, 2011 at 3:49 AM, Marcelo S Zanetti wrote:
> IF 1==SELECT COUNT(*) from table
> WHERE item==new THEN SELECT itemID from tabel WHERE item==new ELSE
> INSERT INTO table (item) VALUES (new)
INSERT INTO t (item) SELECT :new WHERE NOT EXISTS (SELECT item FROM t
WHERE item = :new);
Here
On Thu, Mar 31, 2011 at 3:48 PM, Richard Hipp wrote:
> On Thu, Mar 31, 2011 at 4:44 PM, Dave White wrote:
>> Any ideas why this would happen?
>
> You have a read transaction being held open. The checkpoint cannot run to
> completion when there is a read transaction open. (It does as much as it
>
On Wed, Mar 30, 2011 at 8:53 AM, Simon Slavin wrote:
> On 30 Mar 2011, at 1:46pm, Mikael wrote:
>> If yes, we have the solution needed already now - app/OS crashes won't crash
>> the database, and rsync backups will create working backups even if made
>> during checkpoints.
>
> But killing the pow
On Tue, Mar 29, 2011 at 11:32 AM, Simon Slavin wrote:
> On 29 Mar 2011, at 4:12pm, Sutter, Doug wrote:
>> I know how to create a unique trigger for each column where I hard-code
>> the column's name as shown below. But I would like to create a trigger
>> that would fire when any column is updated
On Mar 27, 2011 10:20 PM, "Darren Duncan" wrote:
>
> Nico Williams wrote:
> > User defined types. There are two types in particular that I'd like
> > to see added:
> >
> > - Bit strings. Bit strings are like character strings, but the
> > ele
On Sun, Mar 27, 2011 at 10:20 PM, Darren Duncan wrote:
> Nico Williams wrote:
>> User defined types. There are two types in particular that I'd like
>> to see added:
>>
>> - Bit strings. Bit strings are like character strings, but the
>> elements can onl
On Sat, Mar 26, 2011 at 8:56 PM, Patrick Earl wrote:
> 1. Support for a base-10 numeric data type.
Looking at the wikipedia page for NHibernate it seems that you don't
export a SQL interface -- all SQL is generated. So, given that, you
should be able to generate SQLite3 statements that use user
On Sun, Mar 27, 2011 at 11:33 AM, jeff archer wrote:
>>From: Patrick Earl
>>Subject: Re: [sqlite] Lack of "decimal" support
>>
>>If SQLite can't decide on a base-10 format itself, perhaps the answer
>>lies in enhancing the API to allow for custom type storage and
>>operators.
>
> So, like a virtu
On Wed, Mar 23, 2011 at 1:30 PM, Igor Tandetnik wrote:
> On 3/23/2011 1:46 PM, TR Shaw wrote:
>> Current US national debt is 16 digits.
>
> A 64-bit unsigned integer can represent about $18 trillion, in
> millionths of a dollar. This should have both range and accuracy to
> spare, for most applica
Also, just to be clear, making the schema writable and then making any
updates to sqlite_master is completely unsupported, and should be.
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I do think that SQLite3 will eventually need to grow ALTER support for
altering constraints. This whole copy-the-table thing is not really a
scalable solution. Without such ALTER functionality users will often
have to implement all constraints as triggers and/or unique indexes
instead of using co
You can store any big-number representation you like as TEXT or BLOB
values. The main issue is that you'll lose syntactic sugar: SQLite3
won't be able to treat those as numeric values, therefore it won't be
able to compare numerically nor use arithmetic with such values. You
can get some of that
On Sun, Mar 13, 2011 at 10:31 AM, Igor Tandetnik wrote:
> Garry Watkins wrote:
>> Not sure why you are using a subselect with a union all.
>>
>> SELECT *
>> FROM multiturnTable
>> WHERE (player1 ='?' OR player2 ='?')
>
> Because OR prevents SQLite from using an index on either player1 or player2
On Tue, Mar 8, 2011 at 9:36 AM, Simon Slavin wrote:
> Yes. Is there any reason why you don't use your own sequences instead of
> relying on SQLite's functions ? You could simply use something like
> max(id)+1 .
Without speaking for the OP, sequences are state that changes when
read, thus your
On Tue, Mar 8, 2011 at 8:25 AM, Jay A. Kreibich wrote:
> On Tue, Mar 08, 2011 at 12:01:03AM -0800, Roger Binns scratched on the wall:
>> On 03/07/2011 09:53 PM, RAKESH HEMRAJANI wrote:
>> > Probleme statement is :
>> > I want to implement nextval keyword in sqlite
>>
>> There are two separate issu
On Mon, Mar 7, 2011 at 11:53 PM, RAKESH HEMRAJANI
wrote:
> I am newbie to sqlite, have started understanding the code, at the moment m
> stuck and not able to understand how to generate byte code
Depending on how strongly wedded you are to syntax, you might be able
to avoid VDBE code generation.
On Fri, Mar 4, 2011 at 7:18 PM, Enrico Thierbach wrote:
> On 04.03.2011, at 22:21, Drake Wilson wrote:
>> Why do you want to do this? In particular, why would it not work to
>> randomize the values from the application side during inserts?
> I am trying to build a solution where two or more data
On Mon, Feb 28, 2011 at 6:23 PM, John wrote:
> Reading a little more about how the vdbe works and a little of the source
> code, I then examined the output of explain. Explain shows that the
> statement:
>
> select distinct x, abs(x) from T ;
>
> First loops over my T table and builds an
On Sun, Feb 27, 2011 at 3:11 PM, Max Vlasov wrote:
> Hmm, yesterday something struck me I can do similar tests on an Asus T91MT
> having SSD as the storage. I got similar timings to Greg's. So it seems like
> page size is a very sensitive parameter for solid state drives. Looks like
> having the p
On Sun, Feb 20, 2011 at 6:36 PM, Samuel Adam wrote:
> On Sun, 20 Feb 2011 14:46:06 -0500, Nico Williams
> wrote:
> I appreciate your extensive (if wildly offtopic) analysis as quoted
> below. You thoroughly misunderstood what I said, though. Again, my
> fork()/exec() comment
On Sun, Feb 20, 2011 at 6:24 AM, Samuel Adam wrote:
> I’m not writing anything multithreaded right now. But next month or next
> year, the humble little SQL user functions I now make could grow up and
> get plugged into something bigger. And before I longjmp(), I like to know
> with certainty wh
On Sun, Feb 20, 2011 at 6:28 AM, Samuel Adam wrote:
> On Sat, 19 Feb 2011 17:12:31 -0500, Pavel Ivanov
> wrote:
>
>> [snip] On
>> Windows it’s different - process is much more heavy-weight object than
>> thread and involves much bigger system load to support it. There’s an
>> official general adv
Pavel, I am fully aware of clone(2). But clone() is not standard, and the
modern Linux pthreads implementation is faithful to the pthreads
specification. POSIX threads are schedulable threads of execution that
share a process' address space. I will grant that my advice regarding
vfork() is based
On Fri, Feb 18, 2011 at 9:32 PM, Roger Binns wrote:
> On 02/18/2011 07:03 PM, Nico Williams wrote:
>> BUT, because SIGFPE is a synchronous
>> signal so you are on much firmer ground: you can't block it,
>
> Incidentally you can block it sometimes but the mechanism
If you know what you are doing, threads are fine. As you know, async signal
handling and threading don't mix well, BUT, because SIGFPE is a synchronous
signal so you are on much firmer ground: you can't block it, but since it is
synchronous you can lexically determine where it might be generated a
On Feb 18, 2011 6:16 PM, "Samuel Adam" wrote:
> FYI, Windows NT is documented to have light threads and heavy processes.
Windows and Unix processes and threads have similar semantics, and thus
roughly comparable performance envelopes.
> To my knowledge, it just was not designed with the goal of
On Wed, Feb 9, 2011 at 2:00 PM, Nico Williams wrote:
> This way an insert into t requires one lookup and update in t_idx and
> one lookup and update in the table's implied rowid index. I.e., twice
> the work of an insert without this additional index and trigger.
Also, you get
sqlite> create table t(n integer not null check (typeof(n) =
'integer'), m integer not null check (typeof(m) = 'integer'));
sqlite> create index t_idx on t (n, m);
sqlite> explain query plan select count(*) != 0 from t t2 where t2.n =
? and t2.m = ?;
0|0|TABLE t AS t2 WITH INDEX t_idx
sqlite> creat
On Tue, Feb 8, 2011 at 9:12 AM, Ian Hardingham wrote:
> Wow - changing to that in combination with indexes on player1 and
> player2 has dropped the time to 25 and 10 - an incredible improvement.
>
> I'll need to get my head around using combinations of queries which each
> only use indexed columns
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