Hello,
I'm newto Derby. My application connecte and create a database using
driver org.apache.derby.jdbc.EmbeddedDriver and url
jdbc:derby:/my/path/to/database;create=True.
I do my inserts, commit and at the end I do myConnection.close().
All works fine :)
But I have just seen that there is a
Le mercredi 29 mars 2006 à 09:35 -0800, Stanley Bradbury a écrit :
yves pielusenet wrote:
Hello,
I'm newto Derby. My application connecte and create a database using
driver org.apache.derby.jdbc.EmbeddedDriver and url
jdbc:derby:/my/path/to/database;create=True.
I do my inserts, commit
Le jeudi 30 mars 2006 à 10:17 +0200, Oystein Grovlen - Sun Norway a
écrit :
yves pielusenet wrote:
Thank you for your answer :)
So, since I use an embedded database, should I use the shutdown command
(database shutdown nor derby shutdown) everytime I do
Connection.close() ? (an if so
Le jeudi 30 mars 2006 à 10:55 +0200, Oystein Grovlen - Sun Norway a
écrit :
yves pielusenet wrote:
Le jeudi 30 mars 2006 à 10:17 +0200, Oystein Grovlen - Sun Norway a
écrit :
yves pielusenet wrote:
Thank you for your answer :)
So, since I use an embedded database, should I use
Le jeudi 30 mars 2006 à 13:19 -0800, Rajesh Kartha a écrit :
yves piel wrote:
Hello,
I have a table with more than 1,000,000 records. I have to iterate over
all records (from the first to the last) very quicly. What is the best
way ?
Is I do a naive 'select * from data' how long the
Hello,
I have such a table :
CREATE TABLE data (
numvign INTEGER PRIMARY KEY,
data BLOB NOT NULL
)
This table should have millions of records. I have to iterate over all
records.
What is the best way (I don't want to have a outOfMemoryException) :
for(int i=0; inbRows; i++){
theData =
solution is more charming.
Richter
yves pielusenet escreveu:
Hello,
I have such a table :
CREATE TABLE data (
numvign INTEGER PRIMARY KEY,
data BLOB NOT NULL
)
This table should have millions of records. I have to iterate over all
records.
What is the best way (I
Hello,
I have this error : java.lang.OutOfMemoryError: Java heap space
So I used a profiler to see what was wrong. I have very lots of object
of that classes :
org.apache.derby.impl.store.raw.data.StoreRecordHeader
org.apache.derby.impl.store.raw.data.RecordId
(I can't find those classes into
Here is how I connect to the database :
String url = jdbc:derby:+purl+pdbname+;create=+cancreatedb;
String driver = org.apache.derby.jdbc.EmbeddedDriver;
Class.forName(driver);
con = DriverManager.getConnection(url, user, passwd);
con.setAutoCommit(false);
And here is how I execute sql
Yes I do commit every 'n' ( I choose 50) insert.
Le lundi 22 mai 2006 à 14:55 -0300, Edson Carlos Ericksson Richter a
écrit :
You do a commit after like
int n = psInsert.executeUpdate();
con.commit();
???
(I've not seen this piece of code there...)
Richter
yves pielusenet
How thank you I didn't see this answer before.
therefore, It seems complicated :c\
Le lundi 22 mai 2006 à 10:34 -0700, Stanley Bradbury a écrit :
yves pielusenet wrote:
Hello,
I have this error : java.lang.OutOfMemoryError: Java heap space
So I used a profiler to see what was wrong. I have
Hello,
I developpe an application which create several derby databases. It may
be 2 ddatabase or 100. In my application, I have a class which create
those databases and connexions.
Here the constructor method :
---
Yes :) that was it !
thank you very much bryan :)
Le mercredi 31 mai 2006 à 07:07 -0700, Bryan Pendleton a écrit :
Is there something to do closing a database to free all memory use by
this database ?
In addition to committing and closing your connections, you can also
shut down the
databases are shutdown (at the same time)):
http://narma.free.fr/depot/avecShutdown.png
It is the same application and the second screen shoot has been taken
more longer after then the first. So I save ~40M :c)
Le mercredi 31 mai 2006 à 16:43 +0200, yves pielusenet a écrit :
Yes
Le jeudi 01 juin 2006 à 10:15 +0200, John Embretsen a écrit :
yves pielusenet wrote:
Here is two screenshoots of jmp (Java Memory Profiler). My application
create 10 derby database (2 by 2).
So before when I didn't shutdown database (look at the Heap size =
63.5MB) :
http
Le vendredi 19 mai 2006 à 13:13 -0700, Stanley Bradbury a écrit :
yves pielusenet wrote:
Hello,
I have such a table :
CREATE TABLE data (
numvign INTEGER PRIMARY KEY,
data BLOB NOT NULL
)
This table should have millions of records. I have to iterate over all
records.
What
--
yves piel
[EMAIL PROTECTED] wrote:
yves pielusenet writes:
Le vendredi 19 mai 2006 à 13:13 -0700, Stanley Bradbury a
écrit :
yves pielusenet wrote:
Hello,
I have such a table :
CREATE TABLE data
I wonder if there is something similare like :
'drop index id_index if not exists' ?
I want to put a condition on a drop statement but it fails.
how can I do ?
thanks ,
--
yves piel
On 9/14/06, yves pielusenet [EMAIL PROTECTED] wrote:
Hello,
I read this :
http://wiki.apache.org/db-derby/ListTableColumns
but I can't retreive the column of my table 'data'. Here is
what i
tested :
ij select columnnumber
Thank you :)
Le vendredi 15 septembre 2006 à 01:55 +0200, Bernt M. Johnsen a écrit :
yves pielusenet wrote:
I wonder if there is something similare like :
'drop index id_index if not exists' ?
I want to put a condition on a drop statement but it fails.
how can I do ?
You could do
Hello,
I read this :
http://wiki.apache.org/db-derby/ListTableColumns
but I can't retreive the column of my table 'data'. Here is what i
tested :
ij select columnnumber, columnname, columndatatype
from sys.systables t, sys.syscolumns, sys.sysschemas s
where tableid=referenceid and
/14/06, yves pielusenet [EMAIL PROTECTED] wrote:
after tests I found this statement :
ij select columnname, columnnumber from sys.systables,
sys.syscolumns where referenceid=tableid and tablename='DATA'
order by columnnumber;
which works well
) such as:
ij select columnnumber, columnname, columndatatype
from sys.systables t, sys.syscolumns, sys.sysschemas s
where tableid=referenceid and t.schemaid=s.schemaid
and schemaname='APP' and tablename='DATA'
order by columnnumber;
On 9/14/06, yves pielusenet [EMAIL PROTECTED] wrote
not restricted the query against any
particular schema, hence it picked it up.
On 9/15/06, yves pielusenet [EMAIL PROTECTED] wrote:
Thank you Francois :)
It works with that schema. but what is the difference between
APP and
SYS ?
And the result is the same
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