o far, I have had no errors involving missing drivers etc.
In addition, I get a new record added to each database each hour
My problem was a timing issue involving instances of derby opening while
another instance was already opened
I don't know how to better my 'work-around'
Bob M
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coming from
the second program is referenced
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starting until the previous task is finished?
I can see a need here for a basic scheduler
Any thoughts / suggestions ?
Bob M
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Hi Rick and Bryan
Many, many thanks for all your good advice
Off to a very good start today...
My problem seems to have been a mismatch of derby.jar versions
And now, I know how to setup the derby.properties file and where to put it
:)
Thanks again - a great forum
Bob M
Dunedin
New
Bryan
Environment Variables
System Variables
variable = Path
value = %DERBY_INSTALL%\lib\derby.jar
Is that what you are meaning?
Bob M
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all copies of derby.jar come from version 10.14.2.0
On Monday I shall see what occurs :)
Bob M
New Zealand
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Unable to load the JDBC driver org.apache.derby.jdbc.Embedded Driver
Please check your ClASSPATH
and the derby log file was as shown abve
On the second hour
my log file showed only the first line and no derby log file can be found
Bob M
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Hi Rick
added the two properties as suggested
the result was dramatic !
in each program I write several lines to a file
this file contains only the first of many lines that should have been
outputed - then nothing
what do I do now ?
Bob M
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hutting down instance a816c00e-016b-e37a-c4d7-0b206fe8 on database
directory C:\Users\b\Databases\us_copiosus_EURCAD_1010 with class loader
com.dukascopy.dds2.greed.agent.a.c@31499e31
--------
Bob M
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1 or more of the programs
I have a separate copy of the driver in a different folder for each program
2) an undisclosed error (i.e. no error message) but the connection is NOT
made and nothing is updated
Please can somebody suggest where I might look to sort out these two
problems ?
Bob M
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htt
thanks Rick
I understand now
Bob M
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is a column in the table but I am not getting the value from
that column
what am I missing?
Bob M
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Hi Harm-Jan
Good spotting - sloppy coding
Many thanks
Bob M
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curances is : - " + (Occurances + 1)),
File_Name);
***
Candidate_ID_to_be_validated = 3
The last entry in the log file is "we get to here - 2"
and I get a NullPointerException error - not exactly sure which line is
creating this error
Bob M
-
***
I am getting an error on the first line of code
SQL State: 42X04
Error Code: 2
Message: Column 'Candidate_ID' is either not in any table or
What should I change in the first line ?
Bob M
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or database
What do I need to do to be able to alter data in a table ?
Bob M
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from table_name where ID =
Search_ID");
The program falters on this line and I am unclear why ?
Bob M
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Hello Hans
Thank you - you are quite correct
Bob M
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The program actions line 8 where it prints out the penultimate record Date
and Time
However, the next line - rs = s.executeQuery("SELECT...FOR UPDATE"); is
not working
I can not understand why ?
Bob M
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ltimate record in table
HOURLY_HISTORY: ");
fw.writetoFile(("Updated penultimate record with p0, result0, p1 &
result1"), File_Name);
// commit the above transactions
conn.commit();
// end of updating the penultimate record
[/code]
It would appear that the program is faultering d
I have now successfully created a new database in a different folder
Many thanks
Bob M
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Hello Harm-Jan
I have checked and both environmental variables are there
Bob M
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Also there is only 1 user account on my computer and that is me - as
administrator
Bob M
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';
Wed Nov 28 15:55:44 NZDT 2018 Thread[main,5,main]
java.io.FileNotFoundException: derby.log (Access is denied)
***
what have I forgotten to do ?
Bob M
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got it now..
many thanks :)
Bob M
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Hi
when I try to create a dbase named us_copiosus_USDJPY I get the enclosed
error message
not sure where to go from here ?
<http://apache-database.10148.n7.nabble.com/file/t3208/Derby_-_setting_up_a_dbase.png>
Bob M
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Hi all
have sorted the problem :)
whew
Bob M
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Hi
Am trying to install the latest version 10.14.1.0
Following instructions - I get to verifying Derby
I input the command - java org.apache.derby.tools.sysinfo
when I enter this command, there is an extremely brief flash on the screen
and that is it ?
what am I doing wrong ?
Bob M
table2 records that my
program says have been created?
Thank you
Bob M
New Zealand
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hello everybody
I looked at the setup of both tables and found that the key in the first,
made up of two fields, had each field NOT NULL
So I applied this to the single field key in table2 - Trade Number
Now - no errors :)
Thanks to all, for such great advice
Bob M
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2
Message: Cannot close a connection while a transaction is still active.
Derby finished
Label: USDJPY_2352017_6
Currency Pair: USDJPY
Closed Trade: USDJPY_2352017_64101 | P/L: -15.5 pips
PL_updates = 1.0
Many thanks
Bob M
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OK John
I have reinitialized the data in table1, table 2 remains static.
After the program has run for 2 times I should have the usual error about a
duplicate key in table2
Exactly what would you wish me to post?
Bob M
p.s. the 2 tables are independent
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tables in the same dbase
Regards
Bob M
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for "adding a new trade record" and found only a
single instance - the code is within the /* */ so how can I continue to
get a reference to these words in an error code?
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(since a trade was
opened and closed on the first run
The new trade number is correctly stated as 4101
At this stage the trade table has 4,100 records
so why the error message regarding duplicate keys ?
I don't get it !
The key is the trade number
Bob M
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Hi John
Understanding a bit more now...
I see when I look at the key to table2 it has the identifier
'SQL170412104645890' as stated in the error message
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Sent
to in the error message, you might have to dig
around in SYS.SYSCONSTRAINTS to identify it.
You are way above my head here :)
Bob M
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Hi John
Trade_no_temp2 is a variable
I do not understand why the error message relates this variable to a table?
Bob M
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I have reinitialized my system and have run my program on a testing platform
At the first time period, everything goes perfectly and it opens a trade but
there is no requirement to update the second of the two derby tables (the
first table is updated OK)
On the second run, the first derby table
Sorry Rick
I may have deleted that line :(
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Hi John
As I read it, only Table1 ever gets updated - correctly
The output suggests that Table2 is updated but that is NOT the case
Output:-
Inserted newest record:- Trading_Date/Trading_Time: 2017-5-18, 18
Oldest record:- Trading_Date/Trading_Time: 2012-02-06, 6
Deleted oldest record
Adding a
// retrieve and output trade number of latest record from the table TABLE2
rs = s.executeQuery("SELECT * FROM TABLE2 ORDER BY Trading_No DESC FETCH
FIRST ROW ONLY");
rs.next();
int trade_no_temp3 = rs.getInt("Trade_No");
fw.writetoFile(("Latest trade record:- Trade Number: "
Hi everybody
My apologies(very red face)
The prices I was saving in my table were only to 3 decimals
My bad :(
Bob M
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the prices with 4 or 5
dec. places
Bob M
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Hi
I haven't tried BigDecimal
To do that, what do you change the following to..
private double price = 0;
Bob M
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Sent from the Apache
Hi
I have a derby database with records that contain a price e.g. 1.21098
I retrieve it by the following line
price = rs.getDouble("price");
when I print it out I get :- 1.21
What do I need to change so that I retrieve the full price with all its
decimal places?
Bob M
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Thank you Bryan
Simple and elegant :)
Bob M
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en consecutive fields in the latest derby record
What is the best way to recode the above section of code?
Many thanks
Bob M
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wrong!
I do not know why this is happening - there seems to be no pattern but the
answer MUST lie in the fact that I am reading a prediction from one record
and comparing that prediction with what actually happened in the very next
record
Can you see where I may be going wrong ?
Thanks
Bob M
) with actual )from
current record) and do some maths
I seem to not be getting the predicted value correct?
Here is my coding
If you can see what could be wrong - let me know :)
Bob M
*
String Date5 = "";
int Time5 = 0;
try
{
rs = s.executeQue
Thank you John
I shall try your suggestion
Functionality is more important than elegance for me :)
Bob M
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--------
If you could indicate code changes to reverse the handling direction I would
be delighted
Thank you
Bob M
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Thanks Rick
Got it now :)
Bob M
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C:/Users/Stan/.netbeans-derby/us_copiosus_USDCAD_S
2016-02-15 02:13:28 Loaded the appropriate driver
2016-02-15 02:13:28 DerbyApp starting in embedded mode
to be read upwards :)
What does the top line mean ? - it seems to me that it IS connecting to the
database ??
Bob M
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Hi
I am using Netbeans to view and correct some data I have in an Apache Derby
Database
I need to delete the contents of the odd field and replace it with
How do I enter the part?
Bob M
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Thanks Rick
oh, so obvious :)
Bob M
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into the request to get that?
Bob M
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SC OFFSET 1 ROW FETCH NEXT 1 ROW ONLY"
where is an integer field which may be
Question: How can I retrieve the record with the highest (non )
value
Thanks
Bob M
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I wish to use the WHERE clause as follows:-
Field 1 = current value of variable 1
Field 2 = current value of variable 2 etc.
when I use code such as
WHERE Field1 = variable1 AND Field2 = variable2
I get an error message saying that variable1 is not in any table in FROM
list.
How do I
I am using the following code:-
rs = s.executeQuery("SELECT Field1, Field2, Field3, Field4 FROM XX "
+ "WHERE Field1 LIKE String1 AND Field2 LIKE String2 AND Field3 LIKE
String3 AND Field4 LIKE String4 "
+ "GROUP BY Field1, Field2, Field3, Field4");
XX - table name
Field1 thru
string1 thru string4 are VARCHAR variables
In my particular case each of the strings can be either"Up" or "Down" but
their values vary each time my program runs which is every 6
hours..
Sorry for being a bit slow, but I am still unclear as to how to ask for a
subset of the
ve)
(4) the sum of the contents of that field in those records
I can code (1) and (3) but how to do (2) & (4) ?
Bob M
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Many thanks
Bob M
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3 = rs.getInt(1);
myConsole.getOut().println("Number of records in subset of table USDJPY_S
where P/L >= 0: " + recordCount3);
Bob M
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Hi
My exposure to derby so far has only involved creating a database, adding
records or deleting a record.
I have not extracted a subset which which to further process
Bob M
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with this code much appreciated
Bob M
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yes- correct
Bob M
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Many thanks
Bob M
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is being
opened, accessed or closed...
Sorry if my explanation is unclear :)
Any suggestions welcome
Bob M
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Thanks John
col3 is defined as INT with no contraints but I can't do
psInsert.setINT(3, NULL);
NULL cannot be resolved to a variable ?
Bob M
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Thanks John
I wasn't sure how to enter NULL into an integer field and so col3 has many
zeroes as well as 1, 2, 3, 4, etc.
and so
(a) do your suggestions change at all ?
(b) how do you enter NULL into an integer field ?
(c) how do you set up col3 to be indexed ?
Thank you
Bob M
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in that column -
many records have nothing in that column
I am wishing to retrieve the latest two records where that column has a
number in it
How do I go about that?
Bob M
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the last two records
*
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= 999.99);
statements.add(psUpdate);
psUpdate.setDouble(1, profit);
psUpdate.executeUpdate();
}
} // end of updating latest record
*
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Thank's Bryan for that information...
I have sorted it out now
The profit field is a dec(5,2) field and so I am using DEFAULT 999.99
Then when I wish to update the latest record with the profit I use a WHERE
profit=999.99
All good :)
Thanks
Bob M
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();
conn.prepareStatement(UPDATE FROM TABLE SET PROFIT_LOSS = profit WHERE
CURRENT OF MYCURSOR).executeUpdate();
myConsole.getOut().println(Updated penultimate record);
***
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, ??);
and if so, what do I put in ?? to get the default value there?
Bob M
p.s. 27 is the field number for profit
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Hi
When creating a new record, what does one need to code to initialize a field
which you wish to have the default value of NULL?
Bob M
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for the final line referring to Profit and
where I wish to set it to NULL initially which is the default
Bob M
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last question, if I may.
After adding a new record, I should like to set the pointer to the
penultimate latest record ordered by DATE and Time so that I can update the
Profit field
Exactly what code do I need to do that, please
Bob M
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();
conn.prepareStatement(DELETE FROM TABLE WHERE CURRENT OF
MYCURSOR).executeUpdate();
// commit the above transactions
conn.commit();
} // end of adding new record and deleting oldest one
Bob M
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Hi
I now have the following code but NO update takes place???
psUpdate = conn.prepareStatement(update TABLE SET PROFIT_LOSS=? WHERE
PROFIT_LOSS=?);
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Thank's John...
I now realise that when I create a new record I enter 0.00 into the
profit/loss field
I guess I should leave that field out when writing a new record and then
try your suggested code to update that 'blank' field
Bob M
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So..
Does the following code seem OK?
// Update Profit/Loss field
psUpdate = conn.prepareStatement(update TABLE SET PROFIT_LOSS=profit WHERE
(TRADING_DATE + TRADING_TIME) = (SELECT MAX(TRADING_DATE + TRADING_TIME)
from TABLE));
statements.add(psUpdate);
/inserting ONLY 26 field values leaving
27th field {Profit/Loss} out
2) later, update latest record - just updating the profit/loss field using
modified code
UPDATE TABLE SET PROFIT_LOSS=9000 WHERE DUE_DATE = (SELECT MAX(due_date)
from TABLE)
Bob M
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and is not in the GROUP BY list.
If this is a CREATE or ALTER statement then 'PROFIT is not in the TABLE
profit is a double variable?
Bob M
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= conn.prepareStatement(update TABLE SET PROFIT_LOSS=?);
statements.add(psUpdate);
psUpdate.setDouble(1, profit);
psUpdate.executeUpdate();
// commit the above transactions
conn.commit();
// end updating Profit
Thanks for any advice
Bob
Thank you Bryan
That's exactly what I need to get started.
Bob M
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Hi
Very new to RSS feeds :)
I wish to store title and pubDate for each headline news item on a RSS feed
in a Derby database
Would appreciate some pointers as to how to achieve this
Bob M
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coding?
Bob M
Dunedin
New Zealand
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):java.io.FileNotFoundException'.
What does this error mean?
Bob M
Dunedin
New Zealand
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Hi Knut
Thanks for your help
With respect to my latest error (see new post) I have just spotted a
derby.log file in my Derby Database folder but I am unable to open it -
Access is denied.
I will try your pieces of code when I get some traction again :)
Bob M
Dunedin
New Zealand
Hi Peter
Permission or attributes - maybe.
Could you spell out how I check these?
What puzzles me is that I did have my application working at an earlier
stage and I am having difficulty understanding why I am now getting a series
of error messages
Bob M
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. completely blank
Sub-folder seg0:-
similar to the above except the 'ticks' are gray - not solid black as above
??
sub-file c510.dat
only Admin listed - not me
Admin - all permissions ticked in black...OK
I note that this file is 996KB - which is large c.f. many others which are
8KB
Bob M
(password, );
String dbName = C:/Program Files/Derby Database/us_copiosus; // the name
of the database
conn = DriverManager.getConnection(protocol + dbName, props);
***
Many thanks
Bob M
Dunedin, New Zealand
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Hi Knut
Thanks for the advice..
My derby version is 10.11.1.1 though :)
I shall come back after a trial run this evening
In the meantime, a question
Why is my derby.log to be found in C:\Downloads ?
Bob M
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Hi Rick and Knut
Many thanks for your time and assistance :)
By deleting the empty .tmp file we are in business again
Should I add any code to stop this happening in the future?
Bob M
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Hi Rick
Please explain in greater detail what I need to
do...
At the moment I am simply running my java application on Dukascopy's Forex
Platform
I do not know where or how to implement what you require
Sorry :(
Bob M
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Hi Rick
derby.log
http://apache-database.10148.n7.nabble.com/file/n142209/derby.log
attempting to upload derby.log
Bob M
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Sent from the Apache Derby
Hi Dyre
Dukascopy is a Swiss Forex (foreign exchange) Broker
The platform I use is a java platform where I can place orders on the Swiss
Forex Market
I do not know about a 'bug'
As I said earlier, I had this all working prior to a laptop meltdown :(
Bob M
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