[Freeswitch-users] Spidermonkey ODBC
Anthony Minessale
anthmct at yahoo.com
Wed Feb 20 06:08:08 PST 2008
Many databases break silently or the connection drops
without any way to know for sure w/o trying to use it.
I choose to ensure in the core that the data is connected.
executing "select 1" is a small price to pay to make sure
that the database is connected considering the importance
of persistent connectivity in the sip, jingle and call
limit databases as well as the javascript that rely on it.
All of those applications to make the safe
assumption that the core will keep the db connected and
to change that would be drastic behavior change and
destabilize the code on the eve of our release.
Therefore i guess we should focus on better heuristics
to detect firebird, preferably based on the driver name
and not by doing a 2nd sql stmt every time.
Anthony Minessale II
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----- Original Message ----
From: David Revill <davidrevill at datarun.co.uk>
To: freeswitch-users at lists.freeswitch.org
Sent: Tuesday, February 19, 2008 4:37:28 PM
Subject: Re: [Freeswitch-users] Spidermonkey ODBC
DIV {
MARGIN:0px;}
Unfortunately, there isn't a universal ansi sql
stmt that will do it as the only statements which can be guaranteed to follow
the ansi standard are the simple select, update and delete statements which rely
on knowing some table name .
I think we are trying to solve a problem which need
not exist. The Javascript application should handle the idle timeout. It
should close the connection if it will not be using it for a while,
and,if it needs to, can do what db_is_up is attempting to do in the
application code. Testing for connection before every query seems an
unneccessary overhead.
----- Original Message -----
From:
Anthony
Minessale
To: freeswitch-users at lists.freeswitch.org
Sent: Tuesday, February 19, 2008 6:38
PM
Subject: Re: [Freeswitch-users]
Spidermonkey ODBC
is
there some universal ansi sql stmt that is small and harmless
but is
supported by everything? to replace "select 1"
Anthony Minessale II
FreeSWITCH http://www.freeswitch.org/
ClueCon http://www.cluecon.com/
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anthm
MSN:anthony_minessale at hotmail.com
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Conference
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-----
Original Message ----
From: David Revill
<davidrevill at datarun.co.uk>
To:
freeswitch-users at lists.freeswitch.org
Sent: Tuesday, February 19, 2008
6:56:31 AM
Subject: Re: [Freeswitch-users] Spidermonkey ODBC
One way to detect firebird would be to put the
'Select first 1 * from RDB$relations' into switch_odbc_handle_connect.
If it succeeds then it is Firebird. A better query might be 'select * from
rdb$database' as the system table rdb$database only ever has 1
record.
-----
Original Message -----
From:
Jonas
Gauffin
To:
freeswitch-users at lists.freeswitch.org
Sent:
Tuesday, February 19, 2008 12:18 PM
Subject:
Re: [Freeswitch-users] Spidermonkey ODBC
I''ve only tested it with firebird on windows. As you said,
your driver name doesnt match any of the names I used to detect if it's
firebird.
The problem is that most databases supports "SELECT 1" as a
query. It will always be successful if the the connection is up. However,
firebird did not support "SELECT 1" and therefore i did query the system
database instead.
If the firebird check fails, it will try to invoke
"SELECT 1", and on firebird that query will fail. And the failure is
interpreted as the connection is down, and therefore it tries to
reconnect.
That's probably why you get that error. If you have any
other idea on how I can detect if it's a firebird db, please let me know and
i'll fix the odbc code.
On Feb 19, 2008 1:05 PM, David Revill <davidrevill at datarun.co.uk>
wrote:
That's a fair point, but db_is_up is only
called in 2 places and the attempted re-connect could be done if the
exec'd query fails. That way it would not be dependant on the name of the
driver.
In my application, the database was queried
at the beginning of the script and the connection closed. It was
explicitly re-connected at the end to post data, so the connection timeout
was not an issue.
-----
Original Message -----
From:
Jonas Gauffin
To:
freeswitch-users at lists.freeswitch.org
Sent:
Tuesday, February 19, 2008 10:35 AM
Subject:
Re: [Freeswitch-users] Spidermonkey ODBC
I did that code a couple of months ago.
The function
was added since connections are closed if they are idle too long, and
they were not reconnected again if that happened.
On Feb 19, 2008 11:22 AM, David Revill <davidrevill at datarun.co.uk>
wrote:
The problem is in switch_odbc.c function
db_is_up. It assumes that the variable is_firebird is true, but the
setting of this variable assumes that the Firebird driver name has
'FIREBIRD', 'FB64' or 'FB32' in it.
I commented out the code in
db_is_up and just returned a true value, as on closer inspection
could not see the point of this function.
David Revill
-----
Original Message -----
From:
David Revill
To:
freeswitch-users at lists.freeswitch.org
Sent:
Tuesday, February 19, 2008 8:58 AM
Subject:
Re: [Freeswitch-users] Spidermonkey ODBC
I spotted this error a few months ago,
and to my shame did not let everyone know. I have since
archived the project so cannot point you to the actual code.
However, the problem is that it assumes the name of the
Firebird Driver (FB64?) to set a boolean, so that it handle
the connection test differently.
When looking at the actual code, I
actually felt that the connection test was redundant, as all it did
was a select from a system table. This meant it was doing two
queries for everyone required. (One to see if it could do a query,
and then one to do it). I therefore commented the connection test
function out.
regards
David Revill
-----
Original Message -----
From:
Steven Brown
To:
freeswitch-users at lists.freeswitch.org
Sent:
Monday, February 18, 2008 11:34 PM
Subject:
[Freeswitch-users] Spidermonkey ODBC
Hi,
I'm experimenting with
spidermonkey for JavaScript call control, the basics seem
fine and I'm now trying to connect to an existing Firebird
database, the Firebird odbc lib is installed ok as is unixODBC and
I can confirm this and access the db no problem with isql,
something strange happens though when I connect in spidermonkey,
basically the odbc connection is made successfully, but then as
soon as I call either exec or query the odbc connection starts to
drop and re-connect continuously,
the isql output is below
isql -v
test
+---------------------------------------+
|
Connected!
|
|
|
|
sql-statement
|
| help
[tablename]
|
|
quit
|
|
|
+---------------------------------------+
SQL> select
first 1 * from
pool_phones
+---------------------+------------+
|
GSMNO
| ORGNO
|
+---------------------+------------+
|
0712345678 |
1
|
+---------------------+------------+
SQLRowCount returns
1
1 rows fetched
SQL>
however the following test code
calling the same query
use("ODBC");
var db = new
ODBC("test","SYSDBA","masterkey");
db.connect();
db.query("select
first 1 * from pool_phones");
db.nextRow();
row =
db.getData();
console_log("INFO","HELLO " + row["GSMNO"]
+ "\n");
exit();
gives the following output and then
just loops disconnecting and reconnecting until I shutdown
freeswitch
2008-02-18 23:26:03 [DEBUG]
switch_core_state_machine.c:144 switch_core_standard_on_execute()
sofia/default/1000 at 192.168.0.7:5060 Execute
javascript(/usr/scripts/test1.js)
2008-02-18 23:26:03 [DEBUG]
mod_spidermonkey.c:3150 js_api_use() Loading ODBC
2008-02-18
23:26:03 [DEBUG] switch_odbc.c:145 switch_odbc_handle_connect()
Connecting test
2008-02-18 23:26:03 [DEBUG] switch_odbc.c:174
switch_odbc_handle_connect() Connected to [test]
2008-02-18
23:26:03 [DEBUG] switch_odbc.c:95 switch_odbc_handle_disconnect()
Disconnected 0 from [test]
2008-02-18 23:26:03 [DEBUG]
switch_odbc.c:142 switch_odbc_handle_connect() Re-connecting
test
2008-02-18 23:26:03 [DEBUG] switch_odbc.c:145
switch_odbc_handle_connect() Connecting test
2008-02-18
23:26:03 [DEBUG] switch_odbc.c:174 switch_odbc_handle_connect()
Connected to [test]
2008-02-18 23:26:03 [CRIT]
switch_odbc.c:234 db_is_up() The sql server is not responding for
DSN test []
2008-02-18 23:26:03 [INFO] switch_odbc.c:239
db_is_up() The connection has been re-established
...
Any ideas much appreciated
Thanks
Steve
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