Here’s the scenario:
You load a page, which renders based on the data in the database (call these the “assumptions”)
Someone changes the assumptions
You submit your page
ERROR!
The general pattern to solve this problem is this (right?):
In your save proc, inside a begin and commit transaction, you validate your assumptions first. If any of them changed, you should return a graceful error message, something like an XML list of the ID’s you had problems with, that you handle in the page rather than let it be handled by the default error handling infrastructure.
So my question is what is the best way to do that?
Return the xml list and an error flag in out parameters that are unset and 0 if it completes correctly?
Use an out parameter to return an error status, and the result of the proc be either the error list or the valid results of the proc?
Something else? (I should note that raiseerror would cause the proc to be in error, and get picked up by the default error handling code)
Update: I would like to return a maniplatable list of IDs that failed (I plan to highlight those cells in the application). I could return them in CSV format in RAISEERROR, but that seems dirty.
I agree - I like RAISEERROR:
-- Validate #whatever
IF #whatever >= '5'
BEGIN
RAISERROR ('Invalid value for #whatever - expected a value less than 5, but received %s.', 10, 1, #whatever)
RETURN 50000
END;
Use the RAISERROR function with the appropriate severity and/or wait level. If you use a low severity this does not necessarily cause an exception, as you contend, and with .Net at least its pretty simple to retrieve these messages. The only downside is that with the StoredProcedure command type in .Net messages are only pumped in groups of 50.
Stored procedures can return multiple result sets. Based on your update, you could also insert errored ids into a temporary table, and then at the end of your procedure select the records from that table as an additional result set you can look at.
I would do an output parameter with a message, the return will already have something which is not 0 if there is an error
also be careful with doomed transaction and check with xact_error, see Use XACT_ABORT to roll back non trapable error transactions
Related
I use datagrip as client to connect redshift and encounter a stranger issue which exhaust my whole day.
When I run my query sql the datagrip complains
[XX000] ERROR: invalid string enlargement request size 1073741823
It seemed that there dont exist a place that I can check more detail error log. And I google this error it also have very little similar question and it seemed maybe due to my field is too long which exceed the max length that redshift can accept. But actually, the story is not such for me I dont have long field, then I comment all my sql statement and re-add them incrementally to locate this issue statement.
Finally, I find the error-msg-triggered statement as below:
(
case when trunc(request_date_skip_weekend_tmp) = to_date('2022-03-21', 'YYYY-MM-DD')
then dateadd(day, 1, trunc(request_date_skip_weekend_tmp))
else request_date_skip_weekend_tmp end
)
request_date_skip_weekend,
After I change it with:
dateadd(day, 1, trunc(request_date_skip_weekend_tmp)) request_date_skip_weekend,
the error complain disappear, it is very hard for me to accept the relationship error message and the sql change, I dont know why my the former statement will trigger error complain.
I will appreciate if you can spot why the former expression error or share some knowledge about where can I fetch more detail error message to know what happened.
Your code snippet is dates and timestamps but the error is for strings. So it is likely you have identified a "trigger" and not root cause. Also since you report that the SQL is very long you could be dealing with compiler optimization changes, moving the failure. Removing a CASE can cause the compiler/optimizer to choose different structures for the query.
One experiment to try is to change the to_date() to a cast to timestamp so there are no implicit casts ('2022-03-21'::timestamp). This is unlikely the cause but it may help.
I expect you will need to post the query to get more help. How large is it? This error could be related to building a large string in the query OR could be related to the text of the query OR creating the output. This isn't a standard "string too long" message so this is something more implicit. You could post to a google doc or some other file sharing service. Just link in the question.
I want to get some statistics about the job I'm running on my pool, and for that I am trying to use the JobStatistics class, but I have been getting job.Statistics as null in most of my runs except for few where the result was magically not null. I read in a documentation (https://learn.microsoft.com/en-us/dotnet/api/microsoft.azure.batch.cloudjob.statistics?view=azurebatch-6.1.0#Microsoft_Azure_Batch_CloudJob_Statistics) that for the statistics results not to be null, I need to use an expand clause with DetailLevel, but each time I do, I get the error: "operation returned an invalid status code 'badrequest' ". This is what I have for that.
ODATADetailLevel detailExJob = new ODATADetailLevel();
detailExJob.SelectClause = "id,executionInfo,stats";
detailExJob.ExpandClause = "id,executionInfo,stats";
await job.RefreshAsync(detailExJob);
What am I missing here? How can I get job.Statistics not to be null?
Thanks!
I'll try to answer your question, but it looks like you have two separate issues.
Job lifetime statistics may not be immediately available. The Batch service
performs periodic roll-up of statistics. I believe the typical delay is about 30minutes, but this is not documented.
The expand clause currently only supports stats. If you modify your detailExJob.ExpandClause statement to be assigned just "stats", then your job query should work. Moreover, you can simplify your detail level object to omit the expand clause altogether since you specified stats in the select clause.
In COBOLDB2 program, what value will be stored in the host variable after getting -811 sqlcode. (i.e multiple rows returned by the query).
No data will be fetched to your host variable because SQLCODE < 0 means there is an error. Please refer to this link: IBM SQL Tutorial
You can use statements of this kind to retrieve single rows of data into host variables. The single row can have as many columns as desired. If a query produces more than one row of data, the database server cannot return any data. It returns an error code instead.
Indeed, no data can be fetched if you just use a query like that. In this case, you can use a CURSOR and the FETCH statement. This way, you can read into the host variable the returned lines one by one.
In short, this goes like this:
declare cursor curs_name for select .... from....where .....
open curs_name
fetch curs_name into host_var
close curs_name
All these instructions are enclosed between EXEC SQL ........... END EXEC. Of course, you have to fetch once for each line. You can check the SQLCODE to see if you reached the end of the cursor. You look for SQLCODE 100.
I am calling one stored procedure from another, and the procedure I am calling has an output parameter. I am then piping the output value into a local variable. That's all well and good, but the problem is that this procedure also has a select statement in it, so when I exec, the results of the procedure are being returned in the final results set.
Is there a way to simply get the value of the output parameter, and ignore everything else?
While technically yes, you shouldn't do it. The engine consumes resources to produce the result set you ignore. You may also produce unnecessary contention. If you don't need the result set, you need another procedure that should only produce the output you desire.
I'm sure there are some tricks for doing this - but the obvious solution that springs to mind is:
INSERT INTO #my_rubbish_temp_table_that_i_CREATEd_earlier
EXEC dbo.mySproc #a, #b, #c OUTPUT
...as per Remus' response, this is a waste of CPU, I/O, etc.
If you can add an additional parameter to your stored procedure that allows the suppression of the resultset, that'd be grand.
I get the following error when running an sqr report on DB2:
SQL0100W - No row was found for FETCH, UPDATE or DELETE; or the result of a query is an empty table. SQLSTATE=02000
The sql in question runs correctly when I paste it into RapidSQL, replacing the parameters. The sql in question is an insert-select. No rows are returned by the select, and this is fine... I expect the report to be blank for my parameters.
Any idea how I can get around this?
DB2 returns always an SQL0100 warning (this is a warning, not an error - errors would have negative values) when no rows are returned. That's the way it is.
I don't know peoplesoft at all - so I can't give you any pointers with that. Back when I was programming for DB2 we ignored those SQL0100 warnings.
If SQR can't gracefully handle a NOT_FOUND SQL0100 return, then code a preliminary query to return a count of the number of rows that satisfy the conditions of the actual query. Check the result of the count in an if-then block in SQR to run the actual query if and only if the row count returned by the preceding query was not zero.
Turns out to be an environment setup issue. Got resolved with no change from me after a couple of builds....
Strange :-/
if you delete delete more than one record using logic operation like delete from tabname where columnnmae=deleterecord and columnnmae=deleterecord then they show this type error.machine an