> A transactions is exactly like the original poster stated it.
>
> Assuming all Update, Select, Insert Commands are Atomic. A transaction
> allows the user to group a bunch of commands together and state they should
> be considered atomic, whereas if there is "a failure", then none of them are
>
On Thu, 2005-05-12 at 21:50 -0400, Doug Henry wrote:
> I was trying to do something like: select count(distinct(something)) from
> table;
SELECT count(*) FROM (SELECT DISTINCT something FROM table);
--
D. Richard Hipp <[EMAIL PROTECTED]>
I was trying to do something like: select count(distinct(something)) from
table;
it seems this is invalid, although they work individually. Is there a way to
get something like this to work in sqlite?
Thanks.
A transactions is exactly like the original poster stated it.
Assuming all Update, Select, Insert Commands are Atomic. A transaction
allows the user to group a bunch of commands together and state they should
be considered atomic, whereas if there is "a failure", then none of them are
committed.
>
> > MySql works like you described.. Frankly im surprised Postgres doesn't .
> > Id imagine there must be a "continue trnasaction" command or something.
>
> You can define a 'savepoint' inside a transaction. If something goes
> wrong you roll back to the savepoint and continue from there.
>
>
John Buck wrote:
> MySql works like you described.. Frankly im surprised Postgres doesn't .
> Id imagine there must be a "continue trnasaction" command or something.
You can define a 'savepoint' inside a transaction. If something goes
wrong you roll back to the savepoint and continue from there.
Hi Steven,
This is a pretty rough example. I have my own sqlite wrapper but this could
give you an idea:
if( nCount > 0 )
{
nRetBegin = m_sql.Exec( "BEGIN;", &szError );
for(INT i=0;imailto:[EMAIL PROTECTED]
Sent: May 12, 2005 5:41 PM
To: sqlite-users@sql
Does anyone have any sample code on doing transactions in sqllite, and
know of a website where
I can read up oh how transactions work?
Thanks
Steve
D. Richard Hipp wrote:
On Thu, 2005-05-12 at 15:19 -0400, Luc Vandal wrote:
are transactions only useful
for when we're writting or updating the d
On Thu, 2005-05-12 at 15:19 -0400, Luc Vandal wrote:
> are transactions only useful
> for when we're writting or updating the database?
Transactions are also useful when you do
multiple SELECTs and you want to be sure
that no other process changes the database
in the between two of your SELECTs.
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Hi Luc,
you got it: Transactions are only used when changing data, not reading
it. If you only read data, you need not concern yourself with transactions.
However, there are side effects:
When using sqlite, you must sqlite3_finalize() all statements before
ending a transaction (commit), or else
Hi!
That's probably a no brainer for you guys but are transactions only useful
for when we're writting or updating the database? Buy using transactions
when fetching data, do I improve anything or I shouldn't do that?
Thanks!
Luc
My understanding is that a SQL database server that supports stored
procedures will behave that way in a stored procedure (same is true for
triggers). But there is nothing to stop a command from executing just
because the previous command failed. If one is 'faking' stored procedures by
executing co
Hi all
any one have a java class to connect to an an sqlite
data base.
thaks for help
_
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I'm very familiar with transactions in Oracle &
Sybase. The provide with mechanism to figure out state
if SQL execution and COMMIT or ROLLBACK.
I did not find any way to do that in SQLITE, but it
has specific syntax like this bellow:
BEGIN TRANSACTION ON CONFLICT ROLLBACK;
END TRANSACTION;
w
This may not be the solution for you but I use the "on conflict"
(http://www.sqlite.org/lang_conflict.html) algorithms when creating tables
to automatically rollback when trying to insert duplicate contents.
Nick
-Original Message-
From: John Buck [mailto:[EMAIL PROTECTED]
Sent: 12 May 2
MySql works like you described.. Frankly im surprised Postgres doesn't .
Id imagine there must be a "continue trnasaction" command or something.
--
JB
-Original Message-
From: Thomas Briggs [mailto:[EMAIL PROTECTED]
Sent: Thursday, May 12, 2005 12:25 PM
To: sqlite-users@sqlite.org
Subje
> > This isn't an SQLite thing either... All databases work
> this way, as
> >far as I'm aware.
> >
> >
> Postgres refuses to process any further sql statements in a
> transaction
> after an error occurs with
> one of the sql statements.
Heh. I should have said that "all databases wit
I can think of no way to implement complex atomic transactions with
rollbacks in a flat SQL script. You need some sort of higher level
language to make decisions about results .. IE C++ etc..
--
JB
-Original Message-
From: Vladimir Zelinski [mailto:[EMAIL PROTECTED]
Sent: Thursday, Ma
Thomas Briggs wrote:
A transaction is a way to make a group of things that happens atomic,
but an SQL statement that generates an error doesn't really make
anything happen, so it has no impact on the transaction itself or any of
the other actions within it. That kinda the whole point, in a way -
A transaction is a way to make a group of things that happens atomic,
but an SQL statement that generates an error doesn't really make
anything happen, so it has no impact on the transaction itself or any of
the other actions within it. That kinda the whole point, in a way - one
statement fail
Here is the problem. My external program builds sql
script and places into file my_script.sql
Then I execute statement "sqlite3 my_db <
my_script.sql" as a system call from my external
program. I can check result of execution this
statement and it always returns 0 (success) regardless
of actual SQL
Aha! Now I understand what's going on. I have been completely
missing the fact that everyone is trying to update the same table
they're reading from. I know that's obvious to you guys, but I
completely missed that subtle fact.
Everything makes sense now. Thanks for your patience. :)
Any return other then 0 from the API function you use to exec your SQL
statement is a fail.
--
JB
-Original Message-
From: Vladimir Zelinski [mailto:[EMAIL PROTECTED]
Sent: Thursday, May 12, 2005 10:31 AM
To: sqlite-users@sqlite.org
Subject: Re: [sqlite] Does sqlite really support trans
On 5/12/05, Vladimir Zelinski <[EMAIL PROTECTED]> wrote:
> I understand that. Question is HOW I can check if
> statement failed or successful? What variable contains
> status of the result of execution.
The return code from the call that executes it.
Are you running SQL via code or from the comman
I understand that. Question is HOW I can check if
statement failed or successful? What variable contains
status of the result of execution.
Vladimir
--- Gé Weijers <[EMAIL PROTECTED]> wrote:
> Vladimir,
>
> When you execute individual statements and
> sqlite3_step or sqlite3_exec
> returns an er
Vladimir,
When you execute individual statements and sqlite3_step or sqlite3_exec
returns an error code you should execute a 'ROLLBACK' in stead of a
'COMMIT'. So the logic is:
exec "BEGIN"
perform a bunch of statements
if(all statements successful)
exec "COMMIT"
else
exec "ROLLBACK"
Ide
Of course, I read documentation and saw that
transaction is a supported feature. But I can't get to
work it. In order to make sure that we talk about the
same thing I understand transaction as atomic
operation. One or more data modification language
statements can be placed within transaction. Onl
I actually do create the new row on the "newdb" database, then attach it to the
"main" one. Sorry if my notation was not clear.
I'm not getting a "no such column" error - I do get a result - but it's not the
one that I'm expecting. I suspect I have to accomplish what I need in code.
Cheers,
De
Sorry, when i wrote compile() i meant sqlite3_prepare().
Martin Engelschalk schrieb:
@Thomas Briggs, Jay Sprenckle
I use the C Api described at http://www.sqlite.org/capi3ref.html.
My code seemed to work with sqlite 3.0.7, but I cannot be too sure
because my project is in development. It would tak
@Thomas Briggs, Jay Sprenckle
I use the C Api described at http://www.sqlite.org/capi3ref.html.
My code seemed to work with sqlite 3.0.7, but I cannot be too sure
because my project is in development. It would take some time to check
with 3.0.7
My code worked roughly like this:
I created an upda
> update column in result row so I won't process it again.
How exactly were you doing this? Building an SQL string and
executing with sqlite3_exec, or did you prepare a parameterized UPDATE
statement (using sqlite3_prepare) and executing it multiple times with
sqlite3_step?
-Tom
I had the same problem. I wrote a daemon to email people who
signed up for a service and never logged in. (offering help).
In pseudo code I did this:
select * from people where user never logged in;
for each row in result set
{
email offer to help;
update column in result
Thank you, Thomas. I used a temporary table, and now it works.
However, it seems that my code worked with sqlite 2. Can this be?
Martin
Thomas Fjellstrom schrieb:
On May 12, 2005 04:59 am, Martin Engelschalk wrote:
Hello,
i open cursor on a table and retrieve rows from it.
For every row i decide
This question seems to come up often, and I'm still confused as to
what problems people are having. What APIs are you using to perform
these steps? In particular, when you want to update a row, are you
using a prepared query that is executed multiple times, or are you
creating an SQL statemen
I believe your sql is wrong:
There is no 'new_id' in attached.keyword.
The alter table was applied to the other table.
UPDATE attached.keyword SET new_id = keyword.id WHERE label = keyword.label;
On 5/11/05, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote:
> Hello,
>
> I'm wondering if SQLite suppo
On May 12, 2005 04:59 am, Martin Engelschalk wrote:
> Hello,
>
> i open cursor on a table and retrieve rows from it.
> For every row i decide whether to update it. However, when executing
> the update I get the error "database table is locked".
> My application is the only one working on the table
Hello,
i open cursor on a table and retrieve rows from it.
For every row i decide whether to update it. However, when executing
the update I get the error "database table is locked".
My application is the only one working on the table.
Is it illegal to update a table while selecting from it or am
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