Re: [sqlite] infinite looping from sqlite3_close()
On Sep 16, 2008, at 5:19 AM, Sathish R wrote:
Hi All,
We are using sqlite3 (version 3.2.1) in our product and we are
experiencing
a problem of infinite loop from sqlite3_close(). The problem is
intermittently reproduced and I am not sure about the exact sequence.
I have described the details below. is anybody else faced similar
problem
before? Can someone please help me here?
we have thread safe enabled.
We collected a core when our process is stuck in infinte loop and
one thread
is infinitely looping in the below marked loop within sqlite3_close
(). So,
it holds the mutex and some other threads are blocked waiting for that
mutex.
#ifndef SQLITE_OMIT_GLOBALRECOVER
{
sqlite3 *pPrev = pDbList;
sqlite3OsEnterMutex();
while( pPrev pPrev-pNext!=db ){ - one thread is infinite
looping in
this while()
pPrev = pPrev-pNext;
}
if( pPrev ){
pPrev-pNext = db-pNext;
}else{
assert( pDbList==db );
pDbList = db-pNext;
}
sqlite3OsLeaveMutex();
}
#endif
I printed the pDbList from core and the list doesn't seem to end
and the
link list seems to have become a cyclic one somehow.
(gdb) p pDbList
$40 = (sqlite3 *) 0x36d00bb8
(gdb) p pDbList-pNext
$41 = (sqlite3 *) 0x107b77a8
(gdb) p pDbList-pNext-pNext
$42 = (sqlite3 *) 0x107b77a8 - link list becomes cyclic...no NULL.
Note: I saw that this entire logic of link list and global recovery
doesn't
exist in recent 3.6.2 code base. Should I consider upgrading to newer
libsqlite library to avoid this problem?
Yes. 3.2.1 is over 3 years old now. Hundreds of bugs have been fixed
since then. Odds are that the problem you're experiencing has been
fixed,
or, if not, you stand a much better chance of getting help with it if
using 3.6.2.
Dan.
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[sqlite] DELETEs using a range from an indexed column
I have this schema:
CREATE TABLE members
(uid INTEGER PRIMARY KEY AUTOINCREMENT,
name TEXT,
score INTEGER);
CREATE INDEX members_score_index ON log (score);
I want to delete the 1000 members with the lowest scores. Assume that
it is extremely unlikely for two members to have identical scores.
Also, the 1000 is arbitrary -- it could be more or less on different
days. But each time I do this deletion, it will be a fixed number.
What's the fastest way to do this? I want to lock the database for as
little time as possible. Would it be:
Method A:
* find the 1000th lowest score:
SELECT score FROM members ORDER BY score LIMIT 1 OFFSET 999;
* delete the records equal to or lower than that score
DELETE FROM members WHERE score = $thousandth_lowest_score;
Or would it be:
Method B:
* find the uids for the 1000 lowest scores:
SELECT uid FROM members ORDER BY score LIMIT 1000;
* delete those records
DELETE FROM members WHERE uid IN ([join $uids ,]);
or:
foreach doomed_uid in $uids do:
DELETE FROM members WHERE uid = $doomed_uid
Or would it be:
Method C:
* delete the records as you find them:
sqlite3_prepare_v2(db, DELETE FROM members WHERE uid = ?, -1, stmt_d,
NULL);
sqlite3_prepare_v2(db, SELECT uid FROM members ORDER BY score LIMIT 1000,
-1, stmt_q, NULL);
while (sqlite3_step(stmt_q) == SQLITE_ROW) {
int uid = sqlite3_column_int(stmt_q, 0);
sqlite3_bind_int(stmt_d, 0, uid);
sqlite3_step(stmt_d);
sqlite3_reset(stmt_d);
}
sqlite3_finalize(stmt_d);
sqlite3_finalize(stmt_q);
Or perhaps something else entirely?
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Re: [sqlite] fts3 database grows
[EMAIL PROTECTED] wrote: Database will grow from about 3.615 KB and continue growing. After 100 more FILLs (40.000 delete+insert actions.) it reaches a size of 85.683 KB. Just in case we are confused due to European and American dots: those are European dots. So it reads: grows from 3 MB to 85 MB. -- Holger LembkeChallenge the net: 3d Traceroute http://d3tr.com/ +49-531-334676 56 Tage auf See: http://56tage.de/ ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
[sqlite] sqlite3_open creation/Opening
Hi all, Does sqlite have any mechanism to determine if sqlite3_open has created a new database or opened an existing database? sqlite3_open returns SQLITE_OK for both creation and open How can i check whether it created or opened an existing database ? Thanks in advance, Aravind. ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
Re: [sqlite] sqlite3_open creation/Opening
Aravinda babu wrote: Hi all, Does sqlite have any mechanism to determine if sqlite3_open has created a new database or opened an existing database? sqlite3_open returns SQLITE_OK for both creation and open How can i check whether it created or opened an existing database ? Thanks in advance, Aravind. Hello! If you're using sqlite3_open, just check whether the database file exists before calling sqlite3_open. Or you could use sqlite3_open_v2, where you can specify separately (using the flags parameter) whether you want a new database to be created or not. ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
[sqlite] Closing database fails due to unfinalized statements
Hi, I do have any unfinalized statements in my application when compiled on Windows, but not on Mac OS X. Is there any difference I am missing to attent for ? How could I see, wich statement (statement handle or SQL query to be used in that statement) is unfinalized ? I do not have any differences in my compiler switches (defines). Thanks Lothar -- | Rapid Prototyping | XSLT Codegeneration | http://www.lollisoft.de Lothar Behrens Heinrich-Scheufelen-Platz 2 73252 Lenningen ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
[sqlite] Update command working from command line but not from a C program
Hi all,
static const char *cmd = CREATE TABLE cert_store_table ( certNumber
INTEGER primary key , certTypeLen INTEGER , certType TEXT , validFlag TEXT,
certData BLOB , lastRowFlag INTEGER);
static const char *updateCmd = UPDATE cert_store_table set lastRowFlag =
:lastRowFlag where lastRowFlag = :lastRowFlag; ;
I added one row in the database
sqlite select * from cert_store_table;
1|4|X509|VALID|0����|1
returnCode = sqlite3_prepare(dbHandle, updateCmd, strlen(updateCmd), stmt,
tail);
if( returnCode!=SQLITE_OK )
{
printf(Can't prepare update cmd in database: %s\n,
sqlite3_errmsg(dbHandle));
sqlite3_close(dbHandle);
}
sqlite3_bind_int(stmt, 1, 0);
sqlite3_bind_int(stmt, 2, 1 );
returnCode = sqlite3_step(stmt);
printf(returnCode : %d\n,returnCode);
Is there any wrong in the above code ?
If i update on the command line using the command , it is working.What is
the issue ??
sqlite select * from cert_store_table;
1|4|X509|VALID|0����|1
sqlite update cert_store_table set lastRowFlag = 0 where lastRowFlag = 1;
sqlite select * from cert_store_table;
1|4|X509|VALID|0����|0
Thanks in advance,
Waiting for your reply,
Aravind.
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Re: [sqlite] Update command working from command line but not from a C program
2008/9/16 Aravinda babu [EMAIL PROTECTED]:
Hi all,
.
.
.
static const char *updateCmd = UPDATE cert_store_table set lastRowFlag =
:lastRowFlag where lastRowFlag = :lastRowFlag; ;
same named parameter twice
.
.
.
Is there any wrong in the above code ?
If i update on the command line using the command , it is working.What is
the issue ??
.
.
.
Waiting for your reply,
Aravind.
Hi Aravind,
You are using the same parameter name - only the first bind value will be used.
See http://www.sqlite.org/c3ref/bind_blob.html.
I suspect that you are ignoring an error from your second call to
sqlite3_bind_int.
Rgds,
Simon
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Re: [sqlite] DELETEs using a range from an indexed column
On Mon, Sep 15, 2008 at 10:57:37PM -0700, Tomas Lee scratched on the wall:
I want to delete the 1000 members with the lowest scores. Assume that
it is extremely unlikely for two members to have identical scores.
Also, the 1000 is arbitrary -- it could be more or less on different
days. But each time I do this deletion, it will be a fixed number.
What's the fastest way to do this?
Your best bet is to just try things out and see.
Method A:
* find the 1000th lowest score:
SELECT score FROM members ORDER BY score LIMIT 1 OFFSET 999;
* delete the records equal to or lower than that score
DELETE FROM members WHERE score = $thousandth_lowest_score;
Do it as one command using a sub-select:
DELETE FROM members WHERE score = (
SELECT score FROM members ORDER BY score LIMIT 1 OFFSET 999);
Personally I don't like this, since it has the potential to delete
too many records. Having repeating scores may be rare, but that's
not never. On the other hand, getting rid of ties at the cut-off
point may be desirable.
Method B:
* find the uids for the 1000 lowest scores:
SELECT uid FROM members ORDER BY score LIMIT 1000;
* delete those records
DELETE FROM members WHERE uid IN ([join $uids ,]);
Again, do it as one command:
DELETE FROM members WHERE uid IN (
SELECT uid FROM members ORDER BY score LIMIT 1000);
I'm not sure about speed, but I like this best from from a readability
standpoint. It is clean and straight forward, and I wouldn't be
surprised to find out it is the fastest.
The only odd thing about this is if several records share the cut-off
score, there isn't any good way of knowing which will be deleted and
which will be left behind. That may or may not matter.
Method C:
* delete the records as you find them:
sqlite3_prepare_v2(db, DELETE FROM members WHERE uid = ?, -1, stmt_d,
NULL);
sqlite3_prepare_v2(db, SELECT uid FROM members ORDER BY score LIMIT
1000, -1, stmt_q, NULL);
while (sqlite3_step(stmt_q) == SQLITE_ROW) {
int uid = sqlite3_column_int(stmt_q, 0);
sqlite3_bind_int(stmt_d, 0, uid);
sqlite3_step(stmt_d);
sqlite3_reset(stmt_d);
}
sqlite3_finalize(stmt_d);
sqlite3_finalize(stmt_q);
Essentially a manual version of Method B.
Which is fastest may depend on the contents of the table and if the
index will actually be used or not. There might also be variations if
the size (the 1000) changes significantly.
Again, just try it and see. Using the sub-selects you can do this
from the command line on a test database to give you a rough idea.
-j
--
Jay A. Kreibich J A Y @ K R E I B I.C H
Our opponent is an alien starship packed with atomic bombs. We have
a protractor. I'll go home and see if I can scrounge up a ruler
and a piece of string. --from Anathem by Neal Stephenson
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Re: [sqlite] Network concurrency question
On Mon, Sep 15, 2008 at 11:49:48PM -0400, [EMAIL PROTECTED] scratched on the wall: I would like to use SQLite from a network share. I would like to create a server app that would do all of the writing to the database except for certain tables, one table per client,the clients would write to their own table only. The client drops it's data/instructions into it's own table, the server app would scan all client tables for new data/instructions and then write the data to the main tables of the database. Would this work without concurrency issues? Doubtful. Since the database is one file, it doesn't matter if the clients keep to their own tables. You still have multiple systems trying to write to the same networked database. Now if each client had a completely separate database, that *might* work, but you'd still have concerns about the remote clients and local server accessing the individual databases at the same time. Another question I have is do I understand correctly that an SQLite database, on a network share, has no problems with many readers, the problem starts with many writers. Is this correct? When many equals 1 or more, yes. Writes need to be completely exclusive. Even if all the writing is done locally, the networked readers may not be kept out of the way for the critical sections of the write operation. My guess is that the write operation would be correct, but the reads may crash or get bad data. -j -- Jay A. Kreibich J A Y @ K R E I B I.C H Our opponent is an alien starship packed with atomic bombs. We have a protractor. I'll go home and see if I can scrounge up a ruler and a piece of string. --from Anathem by Neal Stephenson ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
Re: [sqlite] Network concurrency question
Another question I have is do I understand correctly that an SQLite database, on a network share, has no problems with many readers, the problem starts with many writers. Is this correct? Thanks, TD Yes, you'll have problems with many writers since each network file system implementation differs from operating system to operating system. I believe there was a recommendation in the documents about implementing your own VFS layer in these cases if you need multiple writers in a network share. Might want to take a look at: http://www.sqlite.org/faq.html#q5 -- // -- Enrique Ramirez Irizarry Lead Developer Indie Code Labs http://www.indiecodelabs.com ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
Re: [sqlite] Closing database fails due to unfinalized statements
On Sep 16, 2008, at 4:44 PM, Lothar Behrens wrote: Hi, I do have any unfinalized statements in my application when compiled on Windows, but not on Mac OS X. Is there any difference I am missing to attent for ? How could I see, wich statement (statement handle or SQL query to be used in that statement) is unfinalized ? Use sqlite3_next_stmt() to find unfinalized statements. sqlite3_sql() to determine the SQL used to prepare them. Dan. ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
Re: [sqlite] Closing database fails due to unfinalized statements
On Tue, Sep 16, 2008 at 11:44:24AM +0200, Lothar Behrens scratched on the wall: Hi, I do have any unfinalized statements in my application when compiled on Windows, but not on Mac OS X. Is there any difference I am missing to attent for ? How could I see, wich statement (statement handle or SQL query to be used in that statement) is unfinalized ? I do not have any differences in my compiler switches (defines). Since Mac OS X now comes with a copy of the SQLite libs installed (that are somewhat out of date), be very careful you're linking against your development libs and not the system libs. IIRC, there was a behavior change a few versions back having to do with how unfinalized statements were handled when you attempt to close the database. If you're linking against a recent download on Windows and an older system lib on the Mac, that might explain the different behavior. -j -- Jay A. Kreibich J A Y @ K R E I B I.C H Our opponent is an alien starship packed with atomic bombs. We have a protractor. I'll go home and see if I can scrounge up a ruler and a piece of string. --from Anathem by Neal Stephenson ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
[sqlite] best language match for SQLite?
I am a beginner to intermediate Python Programmer. I can use SQLite with it just fine but it is my understanding that relational database and object oriented programming our not the perfect marriage. I was just wondering if anyone had an opinion on the most ideal language to use with SQLite? I love Python but I LOVE SQLite, I would learn another language just to use it better-Patrick ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
Re: [sqlite] best language match for SQLite?
Patrick wrote: I was just wondering if anyone had an opinion on the most ideal language to use with SQLite? I love Python but I LOVE SQLite, I would learn another language just to use it better-Patrick According to a paper written by Richard Hipp (the creator of SQLite), Tcl is the ideal language. Here's a quote from the mentioned paper: The increasing popularity of SQLite is seen in the fact that the main website daily serves about a gigabyte of data to around 3000 unique IP addresses. SQLite has been eagerly embraced by PHP, Perl, and Python programmers. What most of these enthusiastic users fail to realize is that SQLite bindings for the three P-languages are an afterthought. SQLite was designed from the beginning to be used with Tcl. Tcl bindings have been in the SQLite core since before version 1.0 and almost half of the SQLite source code base consists of regression test scripts written in Tcl. SQLite wants to be programmed in Tcl, not those other languages. The entire paper can be found here: http://www.tcl.tk/community/tcl2004/Papers/D.RichardHipp/drh.html Jeff ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
Re: [sqlite] best language match for SQLite?
Jeff Godfrey wrote: According to a paper written by Richard Hipp (the creator of SQLite), Tcl is the ideal language. Here's a quote from the mentioned paper: The increasing popularity of SQLite is seen in the fact that the main website daily serves about a gigabyte of data to around 3000 unique IP addresses. SQLite has been eagerly embraced by PHP, Perl, and Python programmers. What most of these enthusiastic users fail to realize is that SQLite bindings for the three P-languages are an afterthought. SQLite was designed from the beginning to be used with Tcl. Tcl bindings have been in the SQLite core since before version 1.0 and almost half of the SQLite source code base consists of regression test scripts written in Tcl. SQLite wants to be programmed in Tcl, not those other languages. The entire paper can be found here: http://www.tcl.tk/community/tcl2004/Papers/D.RichardHipp/drh.html While that's true, Ruby works really well with SQLite! Cheers, Mohit. 9/17/2008 | 12:11 AM. ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
Re: [sqlite] best language match for SQLite?
SQLite is written in C, and its creators seem to be fond of TCL, so those are 2 good choices, but I don't think there is a most ideal language for anything - it all depends on balancing what you need to do and what you want to learn. And of course, Perl is always best. :) g -Original Message- From: Patrick [mailto:[EMAIL PROTECTED] Sent: Tuesday, September 16, 2008 10:51 AM To: General Discussion of SQLite Database Subject: [sqlite] best language match for SQLite? I am a beginner to intermediate Python Programmer. I can use SQLite with it just fine but it is my understanding that relational database and object oriented programming our not the perfect marriage. I was just wondering if anyone had an opinion on the most ideal language to use with SQLite? I love Python but I LOVE SQLite, I would learn another language just to use it better-Patrick ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
Re: [sqlite] best language match for SQLite?
And of course, Perl is always best. :) That's right brother! Educate them , Educate them i say! P. Date: Tue, 16 Sep 2008 11:13:27 -0500 From: [EMAIL PROTECTED] To: sqlite-users@sqlite.org Subject: Re: [sqlite] best language match for SQLite? SQLite is written in C, and its creators seem to be fond of TCL, so those are 2 good choices, but I don't think there is a most ideal language for anything - it all depends on balancing what you need to do and what you want to learn. And of course, Perl is always best. :) g -Original Message- From: Patrick [mailto:[EMAIL PROTECTED] Sent: Tuesday, September 16, 2008 10:51 AM To: General Discussion of SQLite Database Subject: [sqlite] best language match for SQLite? I am a beginner to intermediate Python Programmer. I can use SQLite with it just fine but it is my understanding that relational database and object oriented programming our not the perfect marriage. I was just wondering if anyone had an opinion on the most ideal language to use with SQLite? I love Python but I LOVE SQLite, I would learn another language just to use it better-Patrick ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users _ See how Windows connects the people, information, and fun that are part of your life. http://clk.atdmt.com/MRT/go/msnnkwxp1020093175mrt/direct/01/ ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
Re: [sqlite] best language match for SQLite?
And of course, Perl is always best. :) Of course; but VB (VB6) is just a bit better. RBS And of course, Perl is always best. :) That's right brother! Educate them , Educate them i say! P. Date: Tue, 16 Sep 2008 11:13:27 -0500 From: [EMAIL PROTECTED] To: sqlite-users@sqlite.org Subject: Re: [sqlite] best language match for SQLite? SQLite is written in C, and its creators seem to be fond of TCL, so those are 2 good choices, but I don't think there is a most ideal language for anything - it all depends on balancing what you need to do and what you want to learn. And of course, Perl is always best. :) g -Original Message- From: Patrick [mailto:[EMAIL PROTECTED] Sent: Tuesday, September 16, 2008 10:51 AM To: General Discussion of SQLite Database Subject: [sqlite] best language match for SQLite? I am a beginner to intermediate Python Programmer. I can use SQLite with it just fine but it is my understanding that relational database and object oriented programming our not the perfect marriage. I was just wondering if anyone had an opinion on the most ideal language to use with SQLite? I love Python but I LOVE SQLite, I would learn another language just to use it better-Patrick ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users _ See how Windows connects the people, information, and fun that are part of your life. http://clk.atdmt.com/MRT/go/msnnkwxp1020093175mrt/direct/01/ ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
Re: [sqlite] best language match for SQLite?
Of course; but VB (VB6) is just a bit better. YES brothers, Educate them, Educate them For you see those 2 are actually my two main programming platforms! Disciples go forth to educate the peoples! P. Date: Tue, 16 Sep 2008 17:20:55 +0100 From: [EMAIL PROTECTED] To: sqlite-users@sqlite.org Subject: Re: [sqlite] best language match for SQLite? And of course, Perl is always best. :) Of course; but VB (VB6) is just a bit better. RBS And of course, Perl is always best. :) That's right brother! Educate them , Educate them i say! P. Date: Tue, 16 Sep 2008 11:13:27 -0500 From: [EMAIL PROTECTED] To: sqlite-users@sqlite.org Subject: Re: [sqlite] best language match for SQLite? SQLite is written in C, and its creators seem to be fond of TCL, so those are 2 good choices, but I don't think there is a most ideal language for anything - it all depends on balancing what you need to do and what you want to learn. And of course, Perl is always best. :) g -Original Message- From: Patrick [mailto:[EMAIL PROTECTED] Sent: Tuesday, September 16, 2008 10:51 AM To: General Discussion of SQLite Database Subject: [sqlite] best language match for SQLite? I am a beginner to intermediate Python Programmer. I can use SQLite with it just fine but it is my understanding that relational database and object oriented programming our not the perfect marriage. I was just wondering if anyone had an opinion on the most ideal language to use with SQLite? I love Python but I LOVE SQLite, I would learn another language just to use it better-Patrick ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users _ See how Windows connects the people, information, and fun that are part of your life. http://clk.atdmt.com/MRT/go/msnnkwxp1020093175mrt/direct/01/ ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users _ Stay up to date on your PC, the Web, and your mobile phone with Windows Live. http://clk.atdmt.com/MRT/go/msnnkwxp1020093185mrt/direct/01/ ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
Re: [sqlite] best language match for SQLite?
On Tue, Sep 16, 2008 at 12:20 PM, [EMAIL PROTECTED] wrote: And of course, Perl is always best. :) Of course; but VB (VB6) is just a bit better. RBS Almost fell out of my chair laughing. But in all seriousness, if you're into ADO.Net, the System.Data.SQLite wrapper by Robert Simpson will make you feel right at home. -- // -- Enrique Ramirez Irizarry Lead Developer Indie Code Labs http://www.indiecodelabs.com ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
Re: [sqlite] best language match for SQLite?
Patrick schrieb: I am a beginner to intermediate Python Programmer. I can use SQLite with it just fine but it is my understanding that relational database and object oriented programming our not the perfect marriage. I was just wondering if anyone had an opinion on the most ideal language to use with SQLite? I love Python but I LOVE SQLite, I would learn another language just to use it better-Patrick Depends really on what you wanna do with it. The best language to use with SQLite is of course SQL ;-). Otherwise it does not really matter. Your right that there is a mismatch between the set oriented operations of relational databases and the more item oriented OO world, thats why there are all those ORMs like SQLalchemy, Storm etc. which bridge the gap. But Tcl isn't a bad recommendation anyway. Might feel a bit foreign for your Python tuned mind, but it has a really, good SQLite interface. Bonus: you can help improve the SQLite testsuite easier if you understand Tcl. Michael ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
Re: [sqlite] best language match for SQLite?
I haven't met a real programmer since I wrote my last TASM program quite a few years ago. :-( -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of palmer ristevski Sent: Tuesday, September 16, 2008 11:19 AM To: General Discussion of SQLite Database Subject: Re: [sqlite] best language match for SQLite? And of course, Perl is always best. :) That's right brother! Educate them , Educate them i say! P. Date: Tue, 16 Sep 2008 11:13:27 -0500 From: [EMAIL PROTECTED] To: sqlite-users@sqlite.org Subject: Re: [sqlite] best language match for SQLite? SQLite is written in C, and its creators seem to be fond of TCL, so those are 2 good choices, but I don't think there is a most ideal language for anything - it all depends on balancing what you need to do and what you want to learn. And of course, Perl is always best. :) g -Original Message- From: Patrick [mailto:[EMAIL PROTECTED] Sent: Tuesday, September 16, 2008 10:51 AM To: General Discussion of SQLite Database Subject: [sqlite] best language match for SQLite? I am a beginner to intermediate Python Programmer. I can use SQLite with it just fine but it is my understanding that relational database and object oriented programming our not the perfect marriage. I was just wondering if anyone had an opinion on the most ideal language to use with SQLite? I love Python but I LOVE SQLite, I would learn another language just to use it better-Patrick ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users _ See how Windows connects the people, information, and fun that are part of your life. http://clk.atdmt.com/MRT/go/msnnkwxp1020093175mrt/direct/01/ ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
Re: [sqlite] best language match for SQLite?
On Sep 16, 2008, at 12:09 PM, Jeff Godfrey wrote: Patrick wrote: I was just wondering if anyone had an opinion on the most ideal language to use with SQLite? I love Python but I LOVE SQLite, I would learn another language just to use it better-Patrick According to a paper written by Richard Hipp (the creator of SQLite), Tcl is the ideal language. Here's a quote from the mentioned paper: The increasing popularity of SQLite is seen in the fact that the main website daily serves about a gigabyte of data to around 3000 unique IP addresses. SQLite has been eagerly embraced by PHP, Perl, and Python programmers. What most of these enthusiastic users fail to realize is that SQLite bindings for the three P-languages are an afterthought. SQLite was designed from the beginning to be used with Tcl. Tcl bindings have been in the SQLite core since before version 1.0 and almost half of the SQLite source code base consists of regression test scripts written in Tcl. SQLite wants to be programmed in Tcl, not those other languages. SQLite is a TCL extension that has escaped into the wild. SQLite was originally written to support a large program written in Tcl/Tk. SQLite would have never existed where it not for TCL. SQLite could not maintain its current quality without the extensive TCL-based test suite. The language bindings for TCL are the most natural and easy-to- use of any language I have seen. The statistics in the quote above are dated. Recently we have been getting about 11,000 unique IPs per day at the website and the amount of TCL code in the source tree (all of the regression tests) is approaching 75%. D. Richard Hipp [EMAIL PROTECTED] ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
Re: [sqlite] best language match for SQLite?
On 9/16/08, Patrick [EMAIL PROTECTED] wrote: I am a beginner to intermediate Python Programmer. I can use SQLite with it just fine but it is my understanding that relational database and object oriented programming our not the perfect marriage. I was just wondering if anyone had an opinion on the most ideal language to use with SQLite? I love Python but I LOVE SQLite, I would learn another language just to use it better-Patrick ___ The best programming language is the one you know best. Since you will be working with a SQL database, getting good at SQL is also very important. ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
Re: [sqlite] best language match for SQLite?
I get a lot of miles out of Perl, 116,000 lines and counting. On Tue, Sep 16, 2008 at 9:41 AM, Fred Williams [EMAIL PROTECTED] wrote: I haven't met a real programmer since I wrote my last TASM program quite a few years ago. :-( -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of palmer ristevski Sent: Tuesday, September 16, 2008 11:19 AM To: General Discussion of SQLite Database Subject: Re: [sqlite] best language match for SQLite? And of course, Perl is always best. :) That's right brother! Educate them , Educate them i say! P. Date: Tue, 16 Sep 2008 11:13:27 -0500 From: [EMAIL PROTECTED] To: sqlite-users@sqlite.org Subject: Re: [sqlite] best language match for SQLite? SQLite is written in C, and its creators seem to be fond of TCL, so those are 2 good choices, but I don't think there is a most ideal language for anything - it all depends on balancing what you need to do and what you want to learn. And of course, Perl is always best. :) g -Original Message- From: Patrick [mailto:[EMAIL PROTECTED] Sent: Tuesday, September 16, 2008 10:51 AM To: General Discussion of SQLite Database Subject: [sqlite] best language match for SQLite? I am a beginner to intermediate Python Programmer. I can use SQLite with it just fine but it is my understanding that relational database and object oriented programming our not the perfect marriage. I was just wondering if anyone had an opinion on the most ideal language to use with SQLite? I love Python but I LOVE SQLite, I would learn another language just to use it better-Patrick ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users _ See how Windows connects the people, information, and fun that are part of your life. http://clk.atdmt.com/MRT/go/msnnkwxp1020093175mrt/direct/01/ ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users -- Jim Dodgen [EMAIL PROTECTED] ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
Re: [sqlite] best language match for SQLite?
For myself, I find C and C++ to be the best for use with SQLite (and the STL makes the set oriented nature of relational databases fit reasonably well). Mostly though that's because those are the languages I prefer to work in, rather than in inherent quality of the bindings. Like the man says, it's a TCL extension that escaped quarantine. Clay On Tue, 16 Sep 2008, Patrick wrote: I am a beginner to intermediate Python Programmer. I can use SQLite with it just fine but it is my understanding that relational database and object oriented programming our not the perfect marriage. I was just wondering if anyone had an opinion on the most ideal language to use with SQLite? I love Python but I LOVE SQLite, I would learn another language just to use it better-Patrick ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
Re: [sqlite] best language match for SQLite?
Mohit Sindhwani escribió: Jeff Godfrey wrote: According to a paper written by Richard Hipp (the creator of SQLite), Tcl is the ideal language. Here's a quote from the mentioned paper: The increasing popularity of SQLite is seen in the fact that the main website daily serves about a gigabyte of data to around 3000 unique IP addresses. SQLite has been eagerly embraced by PHP, Perl, and Python programmers. What most of these enthusiastic users fail to realize is that SQLite bindings for the three P-languages are an afterthought. SQLite was designed from the beginning to be used with Tcl. Tcl bindings have been in the SQLite core since before version 1.0 and almost half of the SQLite source code base consists of regression test scripts written in Tcl. SQLite wants to be programmed in Tcl, not those other languages. The entire paper can be found here: http://www.tcl.tk/community/tcl2004/Papers/D.RichardHipp/drh.html While that's true, Ruby works really well with SQLite! Ruby rocks. C# rocks. D rocks. I used ruby in a project and i am very happy. /gem install sqlite3/-ruby ... This 3 languages are completed from the begining and with different uses. For me the universe must be in C and autocreate bindings to other languages is direct if the C APi is well designed. http://live.gnome.org/Vala http://live.gnome.org/GObjectIntrospection If you design a masterful API in C, you can access to all languages like JAVA, c#, ruby, python, PERL,D, C++, ... This is the perfect sample of this API: http://library.gnome.org/devel/glib/2.18/ This is the perfect sample of a full Object oriented API in C with Gobject: http://library.gnome.org/devel/gtk/stable/ I doubt SQLite was more apropiate to use in TCL. I see the C API of SQlite very clean and easy to hack in other languages. In my opinion TCL.like perl, is death and sucks in my opinion. Ofusctated life... PD: I was PERL user in the past and i change it for ruby. Regards Cheers, Mohit. 9/17/2008 | 12:11 AM. ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
Re: [sqlite] best language match for SQLite?
On 9/16/08, Martin (OPENGeoMap) [EMAIL PROTECTED] wrote: Mohit Sindhwani escribió: Jeff Godfrey wrote: According to a paper written by Richard Hipp (the creator of SQLite), Tcl is the ideal language. Here's a quote from the mentioned paper: The increasing popularity of SQLite is seen in the fact that the main website daily serves about a gigabyte of data to around 3000 unique IP addresses. SQLite has been eagerly embraced by PHP, Perl, and Python programmers. What most of these enthusiastic users fail to realize is that SQLite bindings for the three P-languages are an afterthought. SQLite was designed from the beginning to be used with Tcl. Tcl bindings have been in the SQLite core since before version 1.0 and almost half of the SQLite source code base consists of regression test scripts written in Tcl. SQLite wants to be programmed in Tcl, not those other languages. The entire paper can be found here: http://www.tcl.tk/community/tcl2004/Papers/D.RichardHipp/drh.html While that's true, Ruby works really well with SQLite! Ruby rocks. C# rocks. D rocks. I used ruby in a project and i am very happy. /gem install sqlite3/-ruby ... This 3 languages are completed from the begining and with different uses. For me the universe must be in C and autocreate bindings to other languages is direct if the C APi is well designed. http://live.gnome.org/Vala http://live.gnome.org/GObjectIntrospection If you design a masterful API in C, you can access to all languages like JAVA, c#, ruby, python, PERL,D, C++, ... This is the perfect sample of this API: http://library.gnome.org/devel/glib/2.18/ This is the perfect sample of a full Object oriented API in C with Gobject: http://library.gnome.org/devel/gtk/stable/ I doubt SQLite was more apropiate to use in TCL. I see the C API of SQlite very clean and easy to hack in other languages. In my opinion TCL.like perl, is death and sucks in my opinion. Ofusctated life... PD: I was PERL user in the past and i change it for ruby. ai, ai, ai... words such as death and sucks in one sentence... fortunately, they are in your opinion. Fortunately, I won't have to change to Ruby as I am quite happy and comfortable with the language of my choice (which happens to start with P). I reiterate -- the best programming language is the one you are best at. Regards Cheers, Mohit. 9/17/2008 | 12:11 AM. ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users -- Puneet Kishor http://punkish.eidesis.org/ Nelson Institute for Environmental Studies http://www.nelson.wisc.edu/ Open Source Geospatial Foundation (OSGeo) http://www.osgeo.org/ ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
[sqlite] Foreign key trigger in transaction triggers wrongly
Hello, I am writing an application with the database layer implemented with
SQLite.NET. I am using SQLite 3.6.1 for Windows. I have 2 tables, Document and
File, where File has a foreign key to the autoincrement primary key of
Document. I enforce referential integrity using a set of foreign key triggers.
The table File is first filled with records where DocumentId=0. Then document
records are created based on a complicated algorithm involving aggregations on
all files. After creating a document, the appropriate files are updated to
point to the document. The inserts and updates run in a transaction. The update
of the File table raises the update trigger. It seems the the trigger is not
seeing the inserted records in the Document table. This looks to me like the
trigger does not see the changes made within the transaction, i.e. the new row
in the table Document. Am I doing something wrong? Is this unexpected behavior?
Thanks in advance for your help! Bjorn -Here are the excerpts of the
database script and statements that raise the trigger: -- table Document CREATE
TABLE [Document]( [Id] INTEGER PRIMARY KEY AUTOINCREMENT,[Title]
TEXT(200)); -- primary key read onlyCREATE TRIGGER [pk_Document]BEFORE
UPDATE OF [Id] ON [Document]FOR EACH ROWBEGINSELECT RAISE( ABORT,
'Primary key invariant: pk_Document' );END;-- table FileCREATE TABLE File(
Id INTEGER PRIMARY KEY AUTOINCREMENT,DocumentId INTEGER, -- foreign key
(Document.Id)RootFolder TEXT(100), -- foreign key (Storage.RootFolder)
FileName TEXT(250),FullName TEXT(500),Path TEXT(250)); -- primary key
read onlyCREATE TRIGGER [pk_File]BEFORE UPDATE OF [Id] ON [File]FOR
EACH ROWBEGINSELECT RAISE( ABORT, 'Primary key invariant: pk_File' );END;--
foreign key File.DocumentId -- Document.Id CREATE TRIGGER
[fk_File_Document_del]BEFORE DELETE ON [Document]FOR EACH ROWWHEN
(old.[Id] IN (SELECT [DocumentId] FROM [File] GROUP BY [DocumentId]))BEGIN
SELECT RAISE( ABORT, 'Foreign key violated: fk_File_Document_del' );END; CREATE
TRIGGER [fk_File_Document_ins]BEFORE INSERT ON [File]FOR EACH ROW
WHEN (new.[DocumentId]0 AND new.[DocumentId] NOT IN (SELECT [Id] FROM
[Document]))BEGINSELECT RAISE( ABORT, 'Foreign key violated:
fk_File_Document_ins' );END; CREATE TRIGGER [fk_FileDocument_upd]BEFORE
UPDATE ON [File]FOR EACH ROWWHEN (new.[DocumentId] NOT IN (SELECT [Id]
FROM [Document]))BEGINSELECT RAISE( ABORT, 'Foreign key violated:
fk_File_Document_upd' );END;The File table is filled with rows where the
DocumentId is 0 (a foreign key violation permitted by the insert trigger). My
application then executes the following SQL statements (aggregated): BEGIN
TRANSACTION INSERT INTO [Document] ([Title]) VALUES ('blabla') SELECT [seq]
FROM [sqlite_sequence] WHERE [name]='Document' UPDATE [File] SET [DocumentId]=1
WHERE [Id]=422 Now the UPDATE fails as the update trigger raises an abort:
Foreign key violated: fk_File_Document_upd -
_
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[sqlite] relational/OO (was Re: best language match for SQLite?)
Michael Schlenker wrote: Patrick schrieb: I am a beginner to intermediate Python Programmer. I can use SQLite with it just fine but it is my understanding that relational database and object oriented programming our not the perfect marriage. Otherwise it does not really matter. Your right that there is a mismatch between the set oriented operations of relational databases and the more item oriented OO world, thats why there are all those ORMs like SQLalchemy, Storm etc. which bridge the gap. Generally speaking there is no impedance mismatch between relational databases and the OO world. Both natively provide relation and tuple data types and relational operators, and sets and arrays etc, and booleans, numbers, text and binary strings etc. Both natively support the creation of arbitrarily complex user-defined data types and operators. Both natively support automatic persistence of any of the above, and atomicity, and transactions. Both support definition and enforcement of arbitrary type, state, and transition constraints, and triggers. Both support multiple views of the same data, sometimes updateable. Both support invoking the compiler at runtime. Both support type graphs and polymorphism, substitutability, inheritence. How they differ are in relatively minor ways, such as in OO you have the concept of a value that is a pointer to a memory address or implementation detail, while in a relational database you don't and there is a clear distinction between a value and a variable, and those are referred to symbolically. The reason that ORMs exist is to either compensate for relatively minor differences, or to provide a wider variety of APIs for a database than the database is providing itself, or compensate in the application-space for a database implementation that lacks some of the relational database features. -- Darren Duncan ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
Re: [sqlite] fts3 database grows
On Tue, Sep 16, 2008 at 12:02 AM, Holger Lembke [EMAIL PROTECTED] wrote: [EMAIL PROTECTED] wrote: Database will grow from about 3.615 KB and continue growing. After 100 more FILLs (40.000 delete+insert actions.) it reaches a size of 85.683 KB. Just in case we are confused due to European and American dots: those are European dots. So it reads: grows from 3 MB to 85 MB. That IS an important distinction! In the 3MB range, optimize() is probably still pretty reasonable. It's basically a sorted merge, so the time required will be dominated by I/O cost. If your database is not fragmented, it can be pretty fast, but for databases with lots of updates over long periods, this kind of thing can start to slow down a lot. -scott ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
Re: [sqlite] Dates SQLite
I use ISO time, which is 20080916122801 as I write this. It can be stored in integer format, is very easy to manipulate and sort. YearMonthDateHourMinuteSecond Brown, Daniel wrote: Good morning list, Could someone point me to the documentation regarding dates and SQLite? I'm having trouble finding anything about what data type I should use to store dates in my SQLite tables, should it be a numerical type (integer or real) or a string? Cheers, Daniel Brown | Software Engineer @ EA Canada The best laid schemes o' mice an' men, gang aft agley ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users -- View this message in context: http://www.nabble.com/Dates---SQLite-tp19496074p19518812.html Sent from the SQLite mailing list archive at Nabble.com. ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
[sqlite] replacing underscore with a tab
How can I replace an underscore (_) in a field with a tab?
This works but seems like suck a hack:
$ sqlite3 foobar.db 'select replace(id,_,{tab}) from bar;' |
sed -e 's/{tab}/\t/'
I was hoping for a char(9) or similar but couldn't find anything in the docs:
http://www.sqlite.org/lang_corefunc.html
Pointers to references greatly appreciated.
Regards,
- Robert
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Re: [sqlite] best language match for SQLite?
My advice was not to have the tail wag the dog. Choose you language as appropriate for the application. Sqlite fits everywhere. For example if it is an embedded system use C. If it it something else a script system like Perl of whatever would be appropriate. If you want an ideally integrated platform use TCL. Martin (OPENGeoMap) wrote: Mohit Sindhwani escribió: Jeff Godfrey wrote: According to a paper written by Richard Hipp (the creator of SQLite), Tcl is the ideal language. Here's a quote from the mentioned paper: The increasing popularity of SQLite is seen in the fact that the main website daily serves about a gigabyte of data to around 3000 unique IP addresses. SQLite has been eagerly embraced by PHP, Perl, and Python programmers. What most of these enthusiastic users fail to realize is that SQLite bindings for the three P-languages are an afterthought. SQLite was designed from the beginning to be used with Tcl. Tcl bindings have been in the SQLite core since before version 1.0 and almost half of the SQLite source code base consists of regression test scripts written in Tcl. SQLite wants to be programmed in Tcl, not those other languages. The entire paper can be found here: http://www.tcl.tk/community/tcl2004/Papers/D.RichardHipp/drh.html While that's true, Ruby works really well with SQLite! Ruby rocks. C# rocks. D rocks. I used ruby in a project and i am very happy. /gem install sqlite3/-ruby ... This 3 languages are completed from the begining and with different uses. For me the universe must be in C and autocreate bindings to other languages is direct if the C APi is well designed. http://live.gnome.org/Vala http://live.gnome.org/GObjectIntrospection If you design a masterful API in C, you can access to all languages like JAVA, c#, ruby, python, PERL,D, C++, ... This is the perfect sample of this API: http://library.gnome.org/devel/glib/2.18/ This is the perfect sample of a full Object oriented API in C with Gobject: http://library.gnome.org/devel/gtk/stable/ I doubt SQLite was more apropiate to use in TCL. I see the C API of SQlite very clean and easy to hack in other languages. In my opinion TCL.like perl, is death and sucks in my opinion. Ofusctated life... PD: I was PERL user in the past and i change it for ruby. Regards Cheers, Mohit. 9/17/2008 | 12:11 AM. ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
Re: [sqlite] replacing underscore with a tab
Robert Citek [EMAIL PROTECTED]
wrote:
How can I replace an underscore (_) in a field with a tab?
This works but seems like suck a hack:
$ sqlite3 foobar.db 'select replace(id,_,{tab}) from bar;' |
sed -e 's/{tab}/\t/'
I was hoping for a char(9) or similar but couldn't find anything in
the docs:
http://www.sqlite.org/lang_corefunc.html
There's no special SQLite function because none is needed. SQLite will
quite happily accept a string literal containing a TAB character. The
trick is to enter one on the command line - and that's an issue with the
shell, not with SQLite.
Assuming you use bash shell, try this:
sqlite3 foobar.db $'select replace(id,\'_\',\'\t\') from bar;'
or
echo -e select replace(id,'_','\t') from bar; | sqlite3 foobar.db
But if you insist on doing it in SQL, this should work:
sqlite3 foobar.db select replace(id,'_',cast(x'09' as text)) from bar;
Igor Tandetnik
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Re: [sqlite] best language match for SQLite?
I don't see any problems with people waving the FLAGS of their favorite programming languages. The more FLAG waving the merrier i say, and people will get to see the many languages being used by the users of SQLite! This is a wonderful venue for freedom of expression and exchange of points of view on the different programming languages and SQLite! P. Date: Tue, 16 Sep 2008 15:27:57 -0500 From: [EMAIL PROTECTED] To: sqlite-users@sqlite.org Subject: Re: [sqlite] best language match for SQLite? My advice was not to have the tail wag the dog. Choose you language as appropriate for the application. Sqlite fits everywhere. For example if it is an embedded system use C. If it it something else a script system like Perl of whatever would be appropriate. If you want an ideally integrated platform use TCL. Martin (OPENGeoMap) wrote: Mohit Sindhwani escribió: Jeff Godfrey wrote: According to a paper written by Richard Hipp (the creator of SQLite), Tcl is the ideal language. Here's a quote from the mentioned paper: The increasing popularity of SQLite is seen in the fact that the main website daily serves about a gigabyte of data to around 3000 unique IP addresses. SQLite has been eagerly embraced by PHP, Perl, and Python programmers. What most of these enthusiastic users fail to realize is that SQLite bindings for the three P-languages are an afterthought. SQLite was designed from the beginning to be used with Tcl. Tcl bindings have been in the SQLite core since before version 1.0 and almost half of the SQLite source code base consists of regression test scripts written in Tcl. SQLite wants to be programmed in Tcl, not those other languages. The entire paper can be found here: http://www.tcl.tk/community/tcl2004/Papers/D.RichardHipp/drh.html While that's true, Ruby works really well with SQLite! Ruby rocks. C# rocks. D rocks. I used ruby in a project and i am very happy. /gem install sqlite3/-ruby ... This 3 languages are completed from the begining and with different uses. For me the universe must be in C and autocreate bindings to other languages is direct if the C APi is well designed. http://live.gnome.org/Vala http://live.gnome.org/GObjectIntrospection If you design a masterful API in C, you can access to all languages like JAVA, c#, ruby, python, PERL,D, C++, ... This is the perfect sample of this API: http://library.gnome.org/devel/glib/2.18/ This is the perfect sample of a full Object oriented API in C with Gobject: http://library.gnome.org/devel/gtk/stable/ I doubt SQLite was more apropiate to use in TCL. I see the C API of SQlite very clean and easy to hack in other languages. In my opinion TCL.like perl, is death and sucks in my opinion. Ofusctated life... PD: I was PERL user in the past and i change it for ruby. Regards Cheers, Mohit. 9/17/2008 | 12:11 AM. ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users _ Stay up to date on your PC, the Web, and your mobile phone with Windows Live. http://clk.atdmt.com/MRT/go/msnnkwxp1020093185mrt/direct/01/ ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
Re: [sqlite] best language match for SQLite?
Best language to use is the one that is suited for the job. Examples: I use Perl as a gluing language to connect various subsystems together, and as a swiss army knife. C, C++ for embedded development on Linux. C++ for Windows development. Forth for embedded development on some specialized hardware. SQL for Oracle, and MS SQL work. and Vim to rule them all. :) andy Message: 1 Date: Tue, 16 Sep 2008 11:50:40 -0400 From: Patrick [EMAIL PROTECTED] Subject: [sqlite] best language match for SQLite? To: General Discussion of SQLite Database sqlite-users@sqlite.org Message-ID: [EMAIL PROTECTED] Content-Type: text/plain; charset=ISO-8859-1; format=flowed I am a beginner to intermediate Python Programmer. I can use SQLite with it just fine but it is my understanding that relational database and object oriented programming our not the perfect marriage. I was just wondering if anyone had an opinion on the most ideal language to use with SQLite? I love Python but I LOVE SQLite, I would learn another language just to use it better-Patrick ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
Re: [sqlite] best language match for SQLite?
Um... excuse me! You can all move to the side and make room for Flex and AIR! Ciao! Javi On Sep 16, 2008, at 5:29 PM, A. H. Ongun wrote: Best language to use is the one that is suited for the job. Examples: I use Perl as a gluing language to connect various subsystems together, and as a swiss army knife. C, C++ for embedded development on Linux. C++ for Windows development. Forth for embedded development on some specialized hardware. SQL for Oracle, and MS SQL work. and Vim to rule them all. :) andy Message: 1 Date: Tue, 16 Sep 2008 11:50:40 -0400 From: Patrick [EMAIL PROTECTED] Subject: [sqlite] best language match for SQLite? To: General Discussion of SQLite Database sqlite-users@sqlite.org Message-ID: [EMAIL PROTECTED] Content-Type: text/plain; charset=ISO-8859-1; format=flowed I am a beginner to intermediate Python Programmer. I can use SQLite with it just fine but it is my understanding that relational database and object oriented programming our not the perfect marriage. I was just wondering if anyone had an opinion on the most ideal language to use with SQLite? I love Python but I LOVE SQLite, I would learn another language just to use it better-Patrick ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
Re: [sqlite] best language match for SQLite?
Glory Be to You! That is the platform I am currently moving into! Adobe Flex/Air where Desktop App and Web Apps merge! P. To: sqlite-users@sqlite.org Date: Tue, 16 Sep 2008 17:33:09 -0400 From: [EMAIL PROTECTED] Subject: Re: [sqlite] best language match for SQLite? Um... excuse me! You can all move to the side and make room for Flex and AIR! Ciao! Javi On Sep 16, 2008, at 5:29 PM, A. H. Ongun wrote: Best language to use is the one that is suited for the job. Examples: I use Perl as a gluing language to connect various subsystems together, and as a swiss army knife. C, C++ for embedded development on Linux. C++ for Windows development. Forth for embedded development on some specialized hardware. SQL for Oracle, and MS SQL work. and Vim to rule them all. :) andy Message: 1 Date: Tue, 16 Sep 2008 11:50:40 -0400 From: Patrick [EMAIL PROTECTED] Subject: [sqlite] best language match for SQLite? To: General Discussion of SQLite Database sqlite-users@sqlite.org Message-ID: [EMAIL PROTECTED] Content-Type: text/plain; charset=ISO-8859-1; format=flowed I am a beginner to intermediate Python Programmer. I can use SQLite with it just fine but it is my understanding that relational database and object oriented programming our not the perfect marriage. I was just wondering if anyone had an opinion on the most ideal language to use with SQLite? I love Python but I LOVE SQLite, I would learn another language just to use it better-Patrick ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users _ Want to do more with Windows Live? Learn “10 hidden secrets” from Jamie. http://windowslive.com/connect/post/jamiethomson.spaces.live.com-Blog-cns!550F681DAD532637!5295.entry?ocid=TXT_TAGLM_WL_domore_092008 ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
Re: [sqlite] replacing underscore with a tab
On Tue, Sep 16, 2008 at 3:49 PM, Igor Tandetnik [EMAIL PROTECTED] wrote: But if you insist on doing it in SQL, this should work: sqlite3 foobar.db select replace(id,'_',cast(x'09' as text)) from bar; That worked: $ sqlite3 foobar.db 'select replace(id,_,cast(x09 as text)) from bar;' Although, using cast was non-obvious to me from reading the docs: http://www.sqlite.org/lang_expr.html Here's another version using bash syntax to insert the tab character: $ sqlite3 foobar.db 'select replace(id,_,'$'\t'') from bar;' Thanks, Igor. Regards, - Robert ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
Re: [sqlite] best language match for SQLite?
How about Flex, AIR and a P backend! On Sep 16, 2008, at 4:33 PM, Javier Julio wrote: Um... excuse me! You can all move to the side and make room for Flex and AIR! Ciao! Javi On Sep 16, 2008, at 5:29 PM, A. H. Ongun wrote: Best language to use is the one that is suited for the job. Examples: I use Perl as a gluing language to connect various subsystems together, and as a swiss army knife. C, C++ for embedded development on Linux. C++ for Windows development. Forth for embedded development on some specialized hardware. SQL for Oracle, and MS SQL work. and Vim to rule them all. :) andy Message: 1 Date: Tue, 16 Sep 2008 11:50:40 -0400 From: Patrick [EMAIL PROTECTED] Subject: [sqlite] best language match for SQLite? To: General Discussion of SQLite Database sqlite-users@sqlite.org Message-ID: [EMAIL PROTECTED] Content-Type: text/plain; charset=ISO-8859-1; format=flowed I am a beginner to intermediate Python Programmer. I can use SQLite with it just fine but it is my understanding that relational database and object oriented programming our not the perfect marriage. I was just wondering if anyone had an opinion on the most ideal language to use with SQLite? I love Python but I LOVE SQLite, I would learn another language just to use it better-Patrick ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
[sqlite] Vista frustrations
I recently had a user of the ADO.NET provider report a problem on Vista. His database is 5gb, and he's doing a full table scan of 16 million rows. Yea. I ran some tests using the command-line sqlite3.exe, and observed that Windows Vista (SP1) is actually trying to cache the entire 5gb file into memory during the table scan! The system slows to a complete crawl and becomes unresponsive. The sqlite3.exe's memory remains very minimal, but Vista itself eats every last scrap of physical memory, forcing all other apps to the paging file trying to cache the contents of the database. It took about 500 seconds to scan the entire table, which isn't all that bad given the circumstances. Unfortunately Vista's cache remained high and continued to make the entire system unresponsive until I quit out of the command-line. After some research, I commented out the FILE_FLAG_RANDOM_ACCESS flag in os_win.c and re-ran the test. It completed in 99 seconds. System remained highly responsive, and Vista never blew out the memory trying to cache the entire file. Now, I know Windows CE benefits greatly from having this flag hint - but has anyone tested normal desktop performance with or without it? To me this seems like an obvious bug in Vista, but the chances of getting Microsoft to fix it are slim to none. Robert ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
