Re: [sqlite] [sqlite-lemon] Lemon Parser Generator Tutorial
[EMAIL PROTECTED] wrote: Freshmeat has a tutorial on the Lemon Parser Generator. http://freshmeat.net/articles/view/1270/ This tutorial walks you through a simple calculator. It would be also interesting to have an example of using Lemon + RE2C (http://re2c.sf.net). I think RE2C lexer works better with Lemon than Flex and produces faster scanners, it suits quite well Lemon input model (lexer calls parser).
[sqlite] FileLocks - help requied
Hi, I am currently porting sqlite 3.0 into my device application. The device is running on an ARM7TDMI processor. The filesystem available on device is Nucleus file system. For this file system I am not sure whether I have the file locking mechanisms as provided in Sqlite 3.0. But the advantageous situation I have is only one thread in the application will be accessing SQLite all time (all the sqlite interfaces are protected using semaphores and there will be no two threads simultaenously accessing sqlite at any time). For this requirement how do I implement my OS functions sqlite3OsLock and sqlite3OsUnlock? Is it possible to work with no locking mechanism? I find that the lock utilisation (in pager.c) is not available with switches. Please advice me on how I could modify the sqlite code accordingly. Regards, Sankara Narayanan B
[sqlite] New SQL Function.
Sorry for my english.
I try to add a new SQL function (sqrt) as described at
http://www.hwaci.com/sw/sqlite/c_interface.html#cfunc
If I try (for understanding pourpose only) to return the same value I give to
the function it's all ok, then (for a little experiment) I try to return the
abs and it's ok again, but when I try to return the sqrt I obtain a compile
error:
./libtool --mode=link gcc -g -O2 -DTHREADSAFE=1 -DOS_UNIX=1 -DOS_WIN=0
-DHAVE_USLEEP=1 -I. -I../sqlite/src -DHAVE_READLINE=0 -o
sqlite ../sqlite/src/shell.c \
libsqlite.la
gcc -g -O2 -DTHREADSAFE=1 -DOS_UNIX=1 -DOS_WIN=0 -DHAVE_USLEEP=1 -I.
-I../sqlite/src -DHAVE_READLINE=0
-o .libs/sqlite ../sqlite/src/shell.c ./.libs/libsqlite.so
./.libs/libsqlite.so: undefined reference to `sqrt'
collect2: ld returned 1 exit status
make: *** [sqlite] Error 1
I have add this :
/*
** Implementation of sqrt by Edo
*/
static void sqrtFunc(sqlite_func *context, int argc, const char **argv){
assert( argc==1 );
sqlite_set_result_double(context,sqrt(sqliteAtoF(argv[0],0)));
}
and ...
} aFuncs[] = {
{ sqrt, 1, SQLITE_NUMERIC, 0, sqrtFunc }, // ... this row
{ min, -1, SQLITE_ARGS,0, minmaxFunc },
Someone can help me ? (sorry again for my english).
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Re: [sqlite] New SQL Function.
Wednesday, August 18, 2004, 1:45:43 PM, Federico wrote: [...] gcc -g -O2 -DTHREADSAFE=1 -DOS_UNIX=1 -DOS_WIN=0 -DHAVE_USLEEP=1 -I. -I../sqlite/src -DHAVE_READLINE=0 -o .libs/sqlite ../sqlite/src/shell.c ./.libs/libsqlite.so ./.libs/libsqlite.so: undefined reference to `sqrt' collect2: ld returned 1 exit status make: *** [sqlite] Error 1 You must link with a math library that includes sqrt. Perhaps adding -lm (assuming you have libm.a and it has sqrt) to the end of the TCC or LTLINK lines in the Makefile will help. e
Re: [sqlite] New SQL Function.
Is there some form of documentation that should all the functions allowed inside an SQL statement? For example: DATE(), CASE, etc __ Raymond Irving --- Doug Currie [EMAIL PROTECTED] wrote: Wednesday, August 18, 2004, 1:45:43 PM, Federico wrote: [...] gcc -g -O2 -DTHREADSAFE=1 -DOS_UNIX=1 -DOS_WIN=0 -DHAVE_USLEEP=1 -I. -I../sqlite/src -DHAVE_READLINE=0 -o .libs/sqlite ../sqlite/src/shell.c ./.libs/libsqlite.so ./.libs/libsqlite.so: undefined reference to `sqrt' collect2: ld returned 1 exit status make: *** [sqlite] Error 1 You must link with a math library that includes sqrt. Perhaps adding -lm (assuming you have libm.a and it has sqrt) to the end of the TCC or LTLINK lines in the Makefile will help. e
Re: [sqlite] Rowid in VIEWs?
Keith Herold wrote: The short question: do (temporary) VIEW's have rowid's in SQLITE? The short answer: no. You don't say how you are accessing the database, but if you are using C, then you can simply use the precompiled query interface to perform your lookup and return your result in small blocks. You will need a getdata function that takes a query and returns up to N results. The first time the function is called it can compile the query and save a pointer to the vm produced. Then it steps the vm until it has retreived N results or the vm is done. If the vm is done it can finalize the vm and clear the vm pointer. In either case it returns the results it retrieved. This will let you get results in small blocks but only perform your complex query once. I hope this helps.
RE: [sqlite] Rowid in VIEWs?
Heh. Didn't think about precompiled queries at all. Have to look into that. The description you give is what I am already writing to handle it from the C++ side, so it looks like I'm half-way there . Thanks for the help. --Keith -Original Message- From: Dennis Cote [mailto:[EMAIL PROTECTED] Sent: Wednesday, August 18, 2004 11:29 AM To: [EMAIL PROTECTED] Subject: Re: [sqlite] Rowid in VIEWs? Keith Herold wrote: The short question: do (temporary) VIEW's have rowid's in SQLITE? The short answer: no. You don't say how you are accessing the database, but if you are using C, then you can simply use the precompiled query interface to perform your lookup and return your result in small blocks. You will need a getdata function that takes a query and returns up to N results. The first time the function is called it can compile the query and save a pointer to the vm produced. Then it steps the vm until it has retreived N results or the vm is done. If the vm is done it can finalize the vm and clear the vm pointer. In either case it returns the results it retrieved. This will let you get results in small blocks but only perform your complex query once. I hope this helps.
[sqlite] locking via windows nfs client
has anyone out there used sqlite from a windows machine when the db resided on an nfs filesystem mounted using the windows nfs client? if so, does it work? have you attempted concurrent access from other windows machines? other *nix machines? i'm considering an application where process from both linux and window machines may access an sqlite db located on a shared nfs fs. comments? -a -- === | EMAIL :: Ara [dot] T [dot] Howard [at] noaa [dot] gov | PHONE :: 303.497.6469 | A flower falls, even though we love it; | and a weed grows, even though we do not love it. | --Dogen ===
[sqlite] Novice Inserting TEXT/BLOB question
Hi all, I'm new to sqlite and was having problems inserting quoted text. I figured out the ' ' andrequirements and it resolved my issues, however I'm curious to know if there are other characters that also require this form of escaping? Is there a list somewhere? Thanks, Chris. -- Chris Rudolph [EMAIL PROTECTED]
