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Earlier my client was using SSRS 2008R2 with Oracle as transaction database. Recently they have upgraded to SSRS 2017 and now many reports are throwing following error:
ERROR: Throwing Microsoft.ReportingServices.ReportProcessing.ProcessingAbortedException: [AbnormalTermination:ReportProcessing], Microsoft.ReportingServices.ReportProcessing.ProcessingAbortedException: An error has occurred during report processing. ---> Microsoft.ReportingServices.ReportProcessing.ReportProcessingException: Query execution failed for dataset 'Ds_Main'. ---> Oracle.ManagedDataAccess.Client.OracleException: ORA-01830: date format picture ends before converting entire input string
After closely looking into report query, I have noticed that this error is for all those reports where oracle function TO_DATE(<Date Value>) has been used without date format. For example:
To_date(:Date_Parameter) -> this syntax throws above mentioned error
To_Date(:Date_Parameter,’MM/DD/YYYY’) -> this syntax works perfectly
I am willing to know:
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Format the Date You can format it to display only the date. Select the Design tab. Right-click the cell with the [Date] field expression and then select Text Box Properties. Select Number, and then in the Category field, select Date.
Use TO_CHAR to display it in any format you like. For example: SELECT TO_CHAR ( TO_DATE (date_value, 'yyyy-mm-dd') , 'mm/dd/yyyy' ) FROM table_x; Things are much easier if you store dates in DATE columns.
Finally, you can change the default DATE format of Oracle from "DD-MON-YY" to something you like by issuing the following command in sqlplus: alter session set NLS_DATE_FORMAT='<my_format>'; The change is only valid for the current sqlplus session.
Oracle stores dates in an internal numeric format representing the century, year, month, day, hours, minutes, seconds. The default date format is DD-MON-YY.
what has changed in SSRS2017 vs SSRS2008R2
SSRS 2008 used the old System.Data.OracleClient. In SSRS 2016 and later you have to install the Oracle ODP.NET provider, built and supported by Oracle. So probably just a difference in how the NLS_DATE_FORMAT session parameter is set by the two drivers.
You can see your setting if you add a dataset to your report with this query:
select parameter, value
from nls_session_parameters
where parameter like 'NLS%'
order by parameter
Unfortunately there doesn't appear to be a way to globally change the client date format in Oracle.ManagedDataAccess, so you'll have to make all the changes in the report dataset queries.
Alternatively you can try to ensure that you are passing Date parameters and not string parameters. If you pass a date to Oracle's to_date() function, you don't need to specify a format.
The docs for SSRS 2014 "This built-in data source type is based on the .NET Framework Managed Provider for Oracle and requires an Oracle client software component."
And for SSRS 2016 "This built-in data source type uses the Oracle Data Provider directly and requires an Oracle client software component."
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