On Fri, Dec 14, 2007 at 03:38:17PM +, [EMAIL PROTECTED] wrote:
> That would be the Serialized Statement Extension, SSE.
> The SSE provides the programmer with two new APIs:
Would it be useful to generate human-readable VDBE "assemply"?
Or, how do you develop parser changes that involve new
On Wed, Jan 31, 2007 at 06:31:20PM -0500, Anderson, James H (IT) wrote:
> Is cast documented on the sqlite website? I couldn't find it.
http://www.sqlite.org/
Click on 'syntax', click on 'expression', arrive at:
http://www.sqlite.org/lang_expr.html
On Wed, Jan 31, 2007 at 05:23:29PM -0500, Shane Harrelson wrote:
>
> I have two tables, an "Objects" table with a foreign key into a second
> "Strings" table which is composed of unique values. It is a many to
> one relationship, that is, several Objects may reference the same
> String. When
On Fri, Jan 26, 2007 at 01:38:07PM -0500, Igor Tandetnik wrote:
> Nicolas Williams <[EMAIL PROTECTED]> wrote:
> >But I read that as "goto to offset 2 and return the first row after
> >offset 2."
>
> Why offset 2, when the clause reads, say, OFFSET 500? Also,
On Fri, Jan 26, 2007 at 12:58:13PM -0500, Igor Tandetnik wrote:
> Nicolas Williams <[EMAIL PROTECTED]> wrote:
> >I can't see why this doesn't work reliably, but if it did it would be
> >O(1).
>
> Imagine that you have just two records in your table, with ROWIDs of
On Fri, Jan 26, 2007 at 09:16:41AM -0700, Dennis Cote wrote:
> The offset mechanism proposed by Igor earlier is far more efficient as
> long as you know the size of the table. You can always get the size from
> a count query, which also requires a table scan, but even that is less
> expensive
On Thu, Jan 25, 2007 at 10:35:23AM -0500, Anderson, James H (IT) wrote:
> I need a way to drop a table only if that table exists. How would I do
> that?
You'd think this would work:
SELECT CASE WHEN
(SELECT count(*) FROM sqlite_master WHERE
type = 'table' AND name = 'foo') > 0
If you'd have a unique index on that column then you could just use
"INSERT OR IGNORE ..."
Nico
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On Mon, Jan 22, 2007 at 06:06:53PM -0600, John Stanton wrote:
> Alternately use a 64 bit machine and a 64 bit OS.
Did you not read what I wrote? That was one of the solutions I offered.
The issue is that memory mapping runs into the 32-bit VM space wall and
you have three options: too bad, go
On Mon, Jan 22, 2007 at 05:13:44PM -0600, John Stanton wrote:
> >Of course. The point is that 32-bit memory models will impact the
> >design of the this pager. Either only support 64-bit memory models,
> >window your memory mappings, or only support small databases.
> >
> Or be adaptive and
On Mon, Jan 22, 2007 at 09:59:56AM -0600, John Stanton wrote:
> A neat way to implement a pager is to memory map a file to make it
> shared virtual memory. Then you need some form of mutex to synchronize
> access to it. If you are sharing it between processes or threads you
> need a lock flag
On Fri, Jan 19, 2007 at 12:51:36AM +0100, Nemanja Corlija wrote:
> On 1/19/07, Nicolas Williams <[EMAIL PROTECTED]> wrote:
> >Why don't you use a trigger to duplicate INSERTs into the memory db to
> >the disk db?
> >
> Nicolas, thanks for the idea. Didn't really
On Sat, Jan 13, 2007 at 06:35:20PM -0500, [EMAIL PROTECTED] wrote:
> I guess that's the trick, to have the "current" or at least "recent"
> database and then the historical one. As of now, the process of polling
> the 17 machines takes about 40 seconds or so (when I first started running
> the
On Sat, Jan 13, 2007 at 12:57:43AM -0500, [EMAIL PROTECTED] wrote:
> The SQLite database
> is INSERTed into because I want to keep historical data. The rationale
> for this is explained later.
For your main application (finding the least
On Tue, Jan 09, 2007 at 01:28:21PM +0100, Florian Weimer wrote:
> If your database isn't too large, and you aren't running on Windows,
> you could make a copy of the database before updating it, so that
> readers and the writer work on different databases.
I wish ZFS would allow one to
On Mon, Jan 08, 2007 at 03:42:47PM +, [EMAIL PROTECTED] wrote:
> [EMAIL PROTECTED] wrote:
> > Can someone tell me why attach cannot be called within transaction?
>
> I do not recall.
>
> Clearly a DETACH will not work inside a transaction if the
> table being detached has been accessed or
On Sat, Jan 06, 2007 at 09:53:39PM -0800, Sean Payne wrote:
> Suppose gui-users wanted to drag and drop rows in a table so that
> they could shuffle it anyway that they wanted so that the rows
> maintained that order the next time they accessed the table. Can
> this be done without
On Thu, Jan 04, 2007 at 12:50:01AM +, Emerson Clarke wrote:
> My oppologies, your right that explanation had been given.
OK.
> But i didnt actually take it seriously, i guess i found it hard to
> believe that it being the easier option was the only reason why this
> limitation was in place.
On Tue, Jan 02, 2007 at 11:56:42PM +, Emerson Clarke wrote:
> The single connection multiple thread alternative apparently has
> problems with sqlite3_step being active on more than one thread at the
> same moment, so cannot easily be used in a safe way. But it is by far
> the fastest and
On Sat, Dec 30, 2006 at 03:34:01PM +, Emerson Clarke wrote:
> Technically sqlite is not thread safe. [...]
Solaris man pages describe APIs with requirements like SQLite's as
"MT-Safe with exceptions" and the exceptions are listed in the man page.
That's still MT-Safe, but the caller has to
On Tue, Dec 26, 2006 at 09:36:42AM -0800, Ken wrote:
> > Your question boils down to this: Can you speed up transactions
> > by dropping the durable property - the D in ACID. Yes you
> > can. Actually, most client/server database engines already
> > do this for you without telling you. Very few
On Wed, Dec 20, 2006 at 01:22:06PM -0500, Laszlo Elteto wrote:
> Nested transactions would solve my problem - but only if it worked across
> different connections. As I said there are many transactions from various
> clients, they may use multiple connections (eg. on a server). I think nested
>
On Wed, Dec 20, 2006 at 02:01:12AM +, [EMAIL PROTECTED] wrote:
> Laszlo Elteto <[EMAIL PROTECTED]> wrote:
> > I DO need Durability, so I don't want to drop that. In fact, I need and want
> > normal transactional updates - just not immediately flushed to disk.
>
> If the information is not
On Wed, Dec 13, 2006 at 05:03:50PM -0400, Cesar Rodas wrote:
> On 13/12/06, John Stanton <[EMAIL PROTECTED]> wrote:
> >
> >It is hard to imagine why you would want to use Sqlite B-Tree access.
>
> I am developing a File System, and I'd like to use B+ Tree and not lost time
> and CPU understanding
On Wed, Dec 13, 2006 at 01:33:35PM -0500, Igor Tandetnik wrote:
> Nicolas Williams <[EMAIL PROTECTED]> wrote:
> >On Wed, Dec 13, 2006 at 06:07:56PM +, RB Smissaert wrote:
> >count(*) doesn't read every record in the table.
>
> Does too. Run EXPLAIN and see for you
On Wed, Dec 13, 2006 at 06:07:56PM +, RB Smissaert wrote:
> Nothing wrong, but is it the fastest?
count(*) doesn't read every record in the table.
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On Wed, Dec 06, 2006 at 12:51:29PM -0600, John Stanton wrote:
> To fully handle the situation you need to know how many users have a
> transaction pending and are pondering ordering the item. That requires
> some form of journal or "committed" total. If you have three items and
> there are
On Wed, Dec 06, 2006 at 11:36:11AM -0600, John Stanton wrote:
> I fully understood. It is an age old problem that has puzzled
> generations of system designers. My first exposure was over thirty
> years ago. The approach we discovered worked was to treat it as a
> transaction in the logical
On Wed, Dec 06, 2006 at 10:06:12AM -0600, John Stanton wrote:
> Marten Feldtmann wrote:
> >But Tcl is not part of SQLite (and this is good) - this is just an
> >add-on. The idea with the
> >additional functions are pretty good !
> >
> How does Sqlite become Sqbloated? By function creep, one
On Wed, Dec 06, 2006 at 10:04:42AM -0600, John Stanton wrote:
> hongdong wrote:
> >I just have a base question:
> >assume user A and user B now both connection to a same database and both of
> >them want to update a same record,but only one is allowed
> >in this condition:
> >A begin to browse
On Tue, Dec 05, 2006 at 06:53:28PM +0100, Marten Feldtmann wrote:
> Perhaps it would be nice to change sqlite3 in that way, that (when columns
> with storage class text) these columns are converted to the host platform
> code page. But actually even in that situation you may have strings, which
>
On Tue, Dec 05, 2006 at 09:58:02AM -0700, Dennis Cote wrote:
> select
>case
>when substr(ip, 2, 1) = '.' then -- one digit first quad
>case
>when substr(ip, 4, 1) = '.' then -- 1 digit second quad
>case
>when substr(ip, 6, 1) = '.' then -- 1 digit
On Tue, Dec 05, 2006 at 08:21:35PM +1100, Kevin Waterson wrote:
> This one time, at band camp, "Trevor Talbot" <[EMAIL PROTECTED]> wrote:
>
>
> > I'd store the IPs in the DB in integer form as Lloyd suggested, if
> > range queries are your goal. Do conversion to and from display format
> > in
On Sun, Dec 03, 2006 at 05:31:55PM +, RB Smissaert wrote:
> Still have the problem though how to compare dates in SQLite when the format
> is the integer mmdd. Maybe I will need some custom SQLite function.
What's difficult about comparing integers of the form mmdd?
Comparing them is
On Sun, Dec 03, 2006 at 11:24:36PM -0600, John Stanton wrote:
> How about running a daemon on your machine which gets the request from
> your user defined function, does the lookup with a persistent connection
> and asynchronously updates the row in the DB? It does not need to be a
> daemon,
Suppose I want to add a user-defined function that may perform remote
lookups. E.g., a function that maps user names, e-mail addresses, or
what have you to internal ID forms (SIDs, POSIX UIDs, GUIDs, etc...) by
asking a remote server to perform this mapping.
Now suppose I wanted to do something
On Fri, Dec 01, 2006 at 08:35:24AM +0100, kamil wrote:
> I want to preallocate disk space for database. I have only one table with ~1
> milion entries, each entry takes about 30 bytes. Entries are added/removed
> but there is some maximum number of items, which can be put into the table
> at
On Thu, Nov 30, 2006 at 10:52:55PM -0600, John Stanton wrote:
> Sqlite has a carefully thought through minimalism. Feature creep would
> detract from its function as a small footprint, embedded DB. If you
> want different features there is nothing to stop you adding your own
> library
On Thu, Nov 30, 2006 at 08:03:00PM +0530, Kalyani Tummala wrote:
> With indexes on every column(searched), the following is the heap size
> for different database operations on a database with 100 records and 6
> tables with an avg of 10 to 15 fields each.
You can probably get by quite well
On Tue, Nov 28, 2006 at 03:03:58PM -0600, Isaac Raway wrote:
> Use an index on the table with your key values and call "INSERT OR
> UPDATE INTO t(...) VALUES(...)" for all creation and update
> operations. Unless you're dealing with a tremendous amount of data per
> record this will be perfectly
On Mon, Nov 27, 2006 at 02:40:44PM -0600, John Stanton wrote:
> You store them in the DB as a BLOB type, but save the data as a JPEG,
> MP3, WAV or whatever it happens to be. The binary data resides as a DB
> column and the same row may have other columns which could be text to
> describe the
On Fri, Nov 03, 2006 at 11:39:47AM -0600, Gabriel Cook wrote:
> So, is there any way to of thing with a BLOB?
>
> > WHERE substr(data, 1, 1) == x'bc'
This works:
WHERE substr(data, 1, 1) == CAST(X'...' AS TEXT);
but only as long as X'...' has no NULs. And probably only as lon as
data contains
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