Hello
It looks like there's a problem on WinCE operating system with the
utf8ToUnicode() / unicodeToUtf8() conversion functions. No database
can be opened by sqlite3_open() because thehes functions fail.
Please have a look what happens there (location: os_win.c :)
/*
** Convert a UTF-8 string
On 6/1/07, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote:
Hello
It looks like there's a problem on WinCE operating system with the
utf8ToUnicode() / unicodeToUtf8() conversion functions. No database
can be opened by sqlite3_open() because thehes functions fail.
Please have a look what happens
Nuno and Vivien thanks for your replies. i will try that.
wang
On 5/23/07, Nuno Lucas <[EMAIL PROTECTED]> wrote:
On 5/23/07, weiyang wang <[EMAIL PROTECTED]> wrote:
> does anyone know how can i get the source codes with the early file
> structure? (65 seperate files)? thanks in advance.
Hi,
I am having a scenario where I have one reader/writer and many writer threads.
All writers are pretty basic (single INSERT INTO; some sort of a logging info
what a thread has done).
I believe I will receive many BUSY return codes and I don't like these
spinlock-like retries. The problem I am
Tom,
> > I don't want to use
> > other database, because I think Sqlite is great for an
> > embedded system that I
> > am using.
>
>I think that your own questions about concurrency prove this
> incorrect. If you need high concurrency and you don't like retries,
> SQLite is not the database
We find that synchronizing access to database writes using a mutex works
well. You could think of implementing read and write locks using the
thread primitives and achieve a better result.
If you do poll to resolve busy checks a spinlock is certainly a bad
idea. When we use that approach we
> I don't want to use
> other database, because I think Sqlite is great for an
> embedded system that I
> am using.
I think that your own questions about concurrency prove this
incorrect. If you need high concurrency and you don't like retries,
SQLite is not the database for you.
-T
Hello
Yes, I can rebuild the image, but i didn't find any UTF-8 code
page. But it really looks like this code page is not installed,
because I tried GetCPInfo(CP_ACP, ) and it failed with
ERROR_INVALID_PARAMETER. Can you tell me where I can enable UTF-8
support. (hope this is not to
Tom Briggs wrote:
I don't want to use
other database, because I think Sqlite is great for an
embedded system that I
am using.
I think that your own questions about concurrency prove this
incorrect. If you need high concurrency and you don't like retries,
SQLite is not the database
On 6/1/07, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote:
Yes, I can rebuild the image, but i didn't find any UTF-8 code
page. But it really looks like this code page is not installed,
because I tried GetCPInfo(CP_ACP, ) and it failed with
ERROR_INVALID_PARAMETER. Can you tell me where I can
If option (b), using a single thread for writing and a multi-threaded write
queue works in your situation, then that would probably provide best
concurrency and performance. The only downside to this is the delayed
writes mean you don't as easily get feedback to the original writer if a
write
I have no suggestions (I'm not an embedded systems guy), but your initial
comment implied that there were other options. If there aren't then your
original statement is invalid and there's nothing to discuss. :)
-T
> -Original Message-
> From: [EMAIL PROTECTED] [mailto:[EMAIL
> If you require ACID type data integrity and have a single
> disk there is
> no such thing as a "high concurrency database". They all
Then don't blame me if he's asking the wrong questions. :)
-T
-
To
On the topic of a more efficient busy handler, one approach I considered was
to implement an event which was signalled when a database unlock occurred.
That way, the busy handler could just wait on the event (which is an
efficient wait state), and be guaranteed of a wake up when the lock is
Samuel R. Neff wrote:
If option (b), using a single thread for writing and a multi-threaded write
queue works in your situation, then that would probably provide best
concurrency and performance. The only downside to this is the delayed
writes mean you don't as easily get feedback to the
// wrapper for sqlite3_prepare_v2 which retries
creating statements if the db returns SQLITE_BUSY or
SQLITE_LOCKED
int sql_prepare(sqlite3 *db, const char *sql,
sqlite3_stmt **ppStmt, int wait) {
#ifdef SQL_DEBUG
printf(sql);
printf("\n");
fflush(stdout);
#endif
int
What if the database is locked by another application, or by another box?
The driver should poll untill it get an "idle database" and then thow an
event... and then, we're polling again.
I'm coding some similar to the original post... I'm not that good with
threads yet, but I did foresee that
With other applications you can use semaphores for synchronization and
achieve minimal latency and a low overhead.
If you have networked files you are dependent upon the file locking and
on the effectiveness of the cross network file locking. This does not
necessarily work as expected and in
Folks.
My app just crashed in the field randomly after some time running fine.
Thread 12 Crashed:
0 libsqlite3.0.dylib 0x9406e587 sqlite3pager_get + 390
1 libsqlite3.0.dylib 0x94054275 sqlite3BtreeCopyFile + 381
2 libsqlite3.0.dylib
On Friday, June 01, 2007 Ian Frosst wrote:
> On the topic of a more efficient busy handler, one approach I considered was
> to implement an event which was signalled when a database unlock occurred.
> That way, the busy handler could just wait on the event (which is an
> efficient wait state),
Got this nearly worked out now, but somehow I can't get the nested case when
syntax right:
SELECT
case
when
date('2006-10-14', '+' || (strftime('%Y', 'now') - strftime('%Y',
'2006-10-14')) || ' years') <= date('now')
then
case when
strftime('%d', 'now') > strftime('%d', '2006-10-14')
then
For Windows, this is not the case with Automatic Reset events. The system
guarantees that only one thread waiting on the event is woken up (it keeps a
queue): the others happily keep sleeping until the next setting of the
event.
On 6/1/07, Doug Currie <[EMAIL PROTECTED]> wrote:
On Friday,
[EMAIL PROTECTED] wrote: Hi,
I am having a scenario where I have one reader/writer and many writer threads.
All writers are pretty basic (single INSERT INTO; some sort of a logging info
what a thread has done).
I believe I will receive many BUSY return codes and I don't like these
On Friday, June 01, 2007 Ian Frosst wrote:
> For Windows, this is not the case with Automatic Reset events. The system
> guarantees that only one thread waiting on the event is woken up (it keeps a
> queue): the others happily keep sleeping until the next setting of the
> event.
That may work
Nice analogy, but in the case the cat really does have 9 lives (or many
more) 'cause with SQLITE_BUSY you can just retry and while retrying is a
performance penalty in my experience SQLITE_BUSY is a very rare occurrence.
All I'm saying is don't fix a perceived problem until you've tested to be
At 11:17 01/06/2007, you wrote:
>Hi,
>
>I am having a scenario where I have one reader/writer and many writer threads.
>All writers are pretty basic (single INSERT INTO; some sort of a logging info
>what a thread has done).
>
>I believe I will receive many BUSY return codes and I don't like these
> Sqlite lets us advance our storage
> capabilities into a more flexible world.
Sure, but it's not allways a good thing. Usually one column stores related
data.
Related data mostly have the same type. Entering a value of different type is
an error
which is silently ignored. Allowing different
Why you said less than 29?
---
Marco Bambini
http://www.sqlabs.net
http://www.sqlabs.net/blog/
http://www.sqlabs.net/realsqlserver/
On Jun 1, 2007, at 6:56 PM, Eduardo Morras wrote:
At 11:17 01/06/2007, you wrote:
Hi,
I am having a scenario where I have one reader/writer and many
writer
When you have a connection with multiple attached databases and the
connection acquires an exclusive lock, does it always lock all attached
databases or does it keep track of which databases require the lock? Does
using separate databases and attaching them improve concurrency (by
providing
At 19:24 01/06/2007, you wrote:
>Why you said less than 29?
SQLite has a soft limit of 10 databases and a hard limit of 32, you can change
it at compile time. If i remember well, sqlite uses two databases for
metadata/schema, so you get a max of 30 databases, you need another one as
master db,
On 6/1/07, RB Smissaert <[EMAIL PROTECTED]> wrote:
Got this nearly worked out now, but somehow I can't get the nested case
when
syntax right:
SELECT
case
when
date('2006-10-14', '+' || (strftime('%Y', 'now') - strftime('%Y',
'2006-10-14')) || ' years') <= date('now')
then
case when
On 6/1/07, Eduardo Morras <[EMAIL PROTECTED]> wrote:
If i remember well, sqlite uses two databases for metadata/schema
Databases or tables? Could you be thinking of the sqlite_master table?
-
To unsubscribe, send
At 19:32 01/06/2007, you wrote:
>When you have a connection with multiple attached databases and the
>connection acquires an exclusive lock, does it always lock all attached
>databases or does it keep track of which databases require the lock? Does
>using separate databases and attaching them
At 20:58 01/06/2007, you wrote:
>On 6/1/07, Eduardo Morras <[EMAIL PROTECTED]> wrote:
>
>>If i remember well, sqlite uses two databases for metadata/schema
>
>Databases or tables? Could you be thinking of the sqlite_master table?
You're right 1 db and 2 tables. Yes i'm thinking on
Yes, that looks better and thanks for that.
Still get the same error though.
I will keep fiddling with it.
RBS
-Original Message-
From: Dennis Cote [mailto:[EMAIL PROTECTED]
Sent: 01 June 2007 19:53
To: sqlite-users@sqlite.org
Subject: Re: [sqlite] Age calculation on literal
On
Got this now, after correcting the brackets:
SELECT
case when
date('2006-10-14', '+' || (strftime('%Y', 'now') - strftime('%Y', '2006-
10-14')) || ' years') <= date('now') then
case when
strftime('%d', 'now') > strftime('%d', '2006-10-14')
then
((strftime('%Y', 'now')
Got the syntax right, but not the logic.
I believe this (VB) function will now get the right SQL to get the age in
months:
Function ISO8601Date2AgeInMonths(strField As String, _
Optional strAlias As String) As String
Dim strAS As String
If Len(strAlias) > 0
I guess this isn't possible after all?
On 5/31/07, Mitchell Vincent <[EMAIL PROTECTED]> wrote:
I have a set of databases that contain a date type called "timestamp".
I need to make those "integer" so they come through the ODBC driver
the right way. Is there any way to change all of that through
--- Mitchell Vincent <[EMAIL PROTECTED]> wrote:
> I guess this isn't possible after all?
Get the SQLite ODBC driver source code and alter it to do whatever
you like when the type "timestamp" column comes up.
> On 5/31/07, Mitchell Vincent <[EMAIL PROTECTED]> wrote:
> > I have a set of databases
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