I just tried the new version 2012.Net/ build 62119 I think there is a bug. E.g. Using "Activation: Limit when machines to = 1" without floating and try make 2 activations from to different machines - it pass! It should have return Activation fail on the second machine activation.
Ok, i had a look at SQL profiler trace and found this....
SELECT COUNT(*) FROM (SELECT DISTINCT ID,MachineCode FROM (SELECT ID,MachineCode,LeaseValidTill FROM LIC_Activation as UniqueActivations WHERE ID = #ID AND MachineCode <> #MachineCode AND LeaseValidTill > #CurrentDate AND activationContext = #activationContext) as UniqueActivations2) AS UniqueActivations3
If #activationContext is NULL then the expression activationContext = #activationContext will fail - always return 0 count....
Is there anybody that have experience same issue or is it me that do something wrong?
This was a regression bug which has been fixed in the latest build.
DISCLAIMER: I work for LogicNP Software, the developers of CryptoLicensing.
Related
I am trying to find records ending in ~0000 such as ABC~0000
but everything I try doesn't seem to work. Some examples:
and left (mfr_part_number, 4) = 'ABC~' -- finds nothing
and left (mfr_part_number, 3) = 'ABC' -- finds stuff
AND RIGHT(MFR_PART_NUMBER, 4) = '0000' -- finds nothing
AND RIGHT(MFR_PART_NUMBER, 5) = '~0000' -- finds nothing
and DbFunctions.Like(MFR_PART_NUMBER,'%0000') -- suggested elsewhere, but not recognized in MSSMS.
I am using:
SQL Server Management Studio 15.0.18206.0
Microsoft Analysis Services Client Tools 15.0.1567.0
Microsoft Data Access Components (MDAC) 10.0.18362.1
Microsoft MSXML 3.0 6.0
Microsoft .NET Framework 4.0.30319.42000
Operating System 10.0.18363
Thanks!
Are you using all of those AND statements in your WHERE clause? If so, that would cause nothing to return if there's no data that matches all criteria.
Try
SELECT column1, column2...
FROM yourdb
WHERE MFR_PART_NUMBER LIKE '%0000'
I have 2 instances of a VB.NET application each running on their own dedicated servers. The said application runs a While true loop with a 5s sleep on IDLE (IDLE is when the Table doesn't have any ProcessQuery to be treated). On each iteration, the application questions a table in the SQL Database to know if there is anything it could process.
The problem is that i sometimes encounter the problem where both of the instances are "taking" the same ProcessQuery.
I'm using EntityFramework6. I have looked into EntityState but i don't think it does exactly what i'm trying to accomplish.
I was wondering what would be my solution to have perfect parallel instances. It's not impossible at some point i have 12 instances running on 12 machines.
Thanks!
Dim conn As New Info_IndusEntities()
Dim DemandeWilma As WilmaDemandes = conn.WilmaDemandes.Where(Function(x) x.Site = 'LONDON' AndAlso x.Statut = 'toProcess').OrderBy(Function(x) x.RequestDate).FirstOrDefault
If Not IsNothing(DemandeWilma) Then
DemandeWilma.Statut = Statuts.EnTraitement.ToString
DemandeWilma.ServerName = Environment.MachineName
DemandeWilma.ProcessDate = DateTime.Now
conn.SaveChanges()
Return DemandeWilma
end if
UPDATE (21/06/19)
I found an article that I find interesting.
I started by adding a column to my Table :
UPDATED (21/06/19)
I then refreshed my model and changed the Concurrency Check property of RowVersion column in my ORM :
When I tested the update, here's the log of EF6 :
UPDATE [dbo].[WilmaDemandes] SET [Statut] = #0, [ServerName] = #1,
[DateDebut] = #2 WHERE (([ID] = #3) AND ([RowVersion] = #4)) SELECT
[RowVersion] FROM [dbo].[WilmaDemandes] WHERE ##ROWCOUNT > 0 AND [ID]
= #3
-- #0: 'EnTraitement' (Type = String, Size = 20)
-- #1: 'TRB5995' (Type = String, Size = 20)
-- #2: '2019-06-25 7:31:01 AM' (Type = DateTime2)
-- #3: '124373' (Type = Int32)
-- #4: 'System.Byte[]' (Type = Binary, Size = 8)
-- Executing at 2019-06-25 7:31:24 AM -04:00
-- Completed in 95 ms with result: SqlDataReader
Closed connection at 2019-06-25 7:31:24 AM -04:00
Exception thrown:
'System.Data.Entity.Infrastructure.DbUpdateConcurrencyException' in
EntityFramework.dll
UPDATED (25/06/19)
The problems, as explained in this post, starts when you are using DB-First instead of Code-First. Your property will get overwritten silently as soon as you update the model. Some people back then coded a console app workaround that they run on pre-build. I'm not sure i'm quite ready to take this solution as final solution.
Interesting tutorial on how to test optimistic concurrency and ways to resolve such an exception.
Add an "owner" column to your queue table
Your application updates one record (TOP 1) and sets the owner value to their identifier (WHERE Owner IS NULL)
Now your application goes back and reads their owned rows and processes them
It's a simple pattern and it works great. If any processes happen to take ownership 'simultaneously', only one will actually get the reservation.
I'm not very good at LINQ so here's a brute force method, multiline for clarity:
// First try reserving a row
conn.Database.ExecuteSqlCommand(
"WITH UpdateTop1 AS
(SELECT TOP 1 * FROM WilmaDemandes
WHERE Owner IS NULL
AND Site = 'LONDON'
ORDER BY RequestDate)
UPDATE UpdateTop1 SET Owner='ThisApplication'"
);
// See if we got one
Dim DemandeWilma As WilmaDemandes =
conn.WilmaDemandes.
Where(x => x.Owner=='ThisApplication').FirstOrDefault
// If we got a row, process it. Otherwise Idle and repeat
There's also no reason that you must reserve one row. You could reserve all the free rows and work your way through them. Meanwhile other processes will pick up any subsequently arriving rows
Personally I would refactor your status column and make it NULL for new records ready to be processed, otherwise it's the worker ID that has reserved it.
It also helps to add things like timestamp columns to record when the row was reserved etc.
I have a program that fails intermittently in a complex query.
The error reads:
System.Data.SqlClient.SqlException: Cannot fetch a row from OLE DB provider "MSDASQL" for linked server "LinkedServer".
The query looks like this:
SELECT Replace([JOB-NO],'M0','') as KeyTaskID,
dbo.SFGET_UniqueTaskID([CLIENT-CODE],Replace([JOB-NO], 'M0', ''), 0, [TRADE-CODE]) AS HMSUniqueTaskID,
[LATEST-PRIORITY] AS PriorityCode,
[KeyProperty] AS KeyProperty,
Replace([JOB-NO],'M0','') AS KeyJob,
[JOB-TYPE] as TaskSubType,
CONVERT(varchar(6),[MAINT-OFFICER]) AS Officer,
LEFT(FORENAME + ' ' + SURNAME, 50) AS OfficerName,
[JOB-NO] + ' ' + LEFT(RTRIM(REPLACE([TEXT-LINE], ';', CHAR(13))), 480) AS Description,
dbo.SFGET_FormattedDate([TARGET-DATE],0) AS DueDateTime,
[CURRENT-STAGE-CODE] AS CurrentStageCode
FROM openquery(LinkedServer, '
SELECT DISTINCT
"RM-JOB"."JOB-NO",
"RM-JOB"."CLIENT-CODE",
"RM-JOB"."LATEST-PRIORITY",
"RM-JOB"."TRADE-CODE",
"RM-JOB"."JOB-TYPE",
"RM-JOB"."TARGET-DATE",
"RM-JOB"."MAINT-OFFICER",
"RM-JOB"."TEXT-LINE",
"RM-JOB"."CURRENT-STAGE-CODE",
"RM-JOB"."PLACE-REF",
"IH_OFFICER".FORENAME,
"IH_OFFICER".SURNAME
FROM "PUB"."RM-JOB"
LEFT OUTER JOIN "PUB"."IH_OFFICER"
ON ("IH_OFFICER"."OFFICER-CODE" = "RM-JOB"."MAINT-OFFICER")
WHERE "RM-JOB"."JOB-TYPE" = ''GASS''
AND "RM-JOB"."JOB-STATUS" = 06
AND "RM-JOB"."CONTRACTOR" = ''NWH001'' ') as ibsTasks
INNER JOIN [SVSExtract].[dbo].Property prop
ON ibsTasks.[PLACE-REF] = prop.UserCode
I have been testing it manually using SQL Server Management Studio. It occassionally fails but it mainly works OK.
I am at a loss as to how I can debug an error that I cannot reproduce at will.
Any suggestions?
I'm not that proficient in SqlClients and Progress myself but: the Progress Knowledgebase might give you a solution!
This entry for instance describes a similar error, even if the version mentioned might be older than the one you use? (Always post version when asking about OpenEdge - there's lots of older installations out there and Progress has evolved quite a bit during the last couple of years).
The Knowledgebase is honestly best searched using Google:
Search for instance: site:knowledgebase.progress.com MSDASQL and you'll get 48 results.
I am running a very simple query and trying to extract the results to a text file. The entire query is essentially what is below, I am selecting everything from one single table with one piece of where criteria which is limiting the data to one month's worth. After it has extracted around 1.2 gig this error shows up. Is there any way that I can work around this other than extracting smaller date ranges? I am trying to pull a couple of years worth of data so if I can only get it a few days at a time it will take a lot of manual work.
I am currently using the free trial of a DB2 query tool - Razor SQL if that makes a difference, I can probably purchase different software if it would help. I am trying to get IBM's tool but for some reason it freezes during the download so I am still working on that. I have searched about this error but everything I see seems much more complex than what I am doing and I can't tell if it applies or not. Thanks in advance.
select *
from MyTable
where date_col between date '2014-01-01' and date '2014-01-31'
I stumbled at this error too, found out it is related to db2jcc.jar (type 4) driver.
Excerpt: If there are no items in the result set left (or to begin with), the Result set is closed automatically and therefore the Exception. Suggestion is to handle it in the application, perhaps in my case, I started checking if(rs.next()) but otherwise, there is a work around. Check out the source link below for how you can set some properties to Data source and avoid exception.
Source :
"Invalid operation: result set is closed" error with Data Server Driver for JDBC
In my case, i missed some properties in WAS, after add allowNextOnExhaustedResultSet the issue is fixed.
1.Log in to the WebSphere Application Server administration console.
2.Select Resources > JDBC > Data sources > Application Center DataSource name > Custom properties and click New.
3.In the Name field, enter allowNextOnExhaustedResultSet.
4.In the Value field, type 1.
5.Change the type to java.lang.Integer.
6.Click OK.
Sometimes you need also check whether resultSetHoldability properties exists. Details refer to here.
I encountered this failure also when ugrading from JDBC Type 2 driver (db2java.zip) JDBC type 4 driver (db2jcc4.jar)
Statement statement = results.getStatement();
if (statement != null)
{
connection = statement.getConnection(); // ** failed here
statement.close();
}
Solution was to check if the statement is closed or not as follows.
Changed to:
Statement statement = results.getStatement();
if (statement != null && !statement.isClosed()) {
{
connection = statement.getConnection();
statement.close();
}
Creating property bellow with type Integer it's worked for me:
allowNextOnExhaustedResultSet:
I had the same issue on WAS 7 so i had to add and change few this on Admin Console.
This TeamWorksRuntimeException exception should be fixed by applying APAR JR50863 which is available on top of BPM V8.5.5 or included on BPM V8.5 refresh pack 6.
For the case that the APAR does not solve the problem, try following workaround:
Log in to the WebSphere Application Server admin console
Select Resources > JDBC > Data sources > DataSource name (TeamWorksDB) > Custom properties and click New
In the Name field, enter downgradeHoldCursorsUnderXa
In the Value field, type true
Change the type to java.lang.Boolean
Click OK to save your changes
Select custom property resultSetHoldability
In the Value field, type 1
Click OK to save your changes
Source of the Answer : https://developer.ibm.com/answers/questions/194821/invalid-operation-result-set-is-closed-errorcode-4/
Restarting the app may fix the problem if connection pool lost session to Db2. If using Tomcat then connection pool property of 'testonBorrow' may reestablish the connection to Db2.
Following code works on my pc but gives error on other pc's. how is it possible to run this successfully on all machines.
QSqlQuery query;
QString queryString = "SELECT * FROM " + parameter3->toAscii() + " WHERE " + parameter1->toAscii() + " = \"" + parameter2->toAscii() + "\"";
bool retX = query.exec(queryString);
What pre requisite should be fulfilled for this to run on any pc
In troubleshooting, if you isolate your query and it returns the result you anticipated ( such as you have done utilizing qt creator to verify the query returns a result of true), the next step would be to take a close look at your code and verify that you are passing the proper parameters into the query for execution.
I have a virgin machine I utilize for this purpose. I am a software engineer by trade and I am fully aware that i have a ton of software installed on my PC which the common user may/will not have installed. So the virgin allows me to test the code in stand-alone form.
I suggest implementing a message box prior to the execution of your query which shows the query to be executed. This will verify the query is correct on the "other machines".
Certain dll's were needed. in my case qtguid4.dll, qtcored4.dll and qtsqld4.dll. There was a size difference. Once matched it worked on a pc. However, on other pc's i still get an error "The application failed to initialize 0xc000007b ....."
How is it possible to make an application run.
Brgds,
kNish