Unable to get data (DSN connection)

Question

I've got a report file, created using ODBC connexion with DSN File
These report work fine in design mode using crystal report full (not Visual studio)
When I try to open this report in a .net application I've got the following error :
Crystal Reports Windows Forms Viewer
Impossible d'extraire des données de la base de données.
Détails : 
Impossible d'extraire des données de la base de données.
Erreur dans le fichier Postes {A47B5908-2F0A-4A3D-A2A5-A708FEB329EB}.rpt:
Impossible d'extraire les données de la base de données.
Détails : 
Which can be translate by :
Unable to extract datas from database
Details:
My database is Oracle, error code 942 means table or view does not exist
In my .net code I use DSN connection (the same as in design mode) like this :
Dim myConnectionInfo As ConnectionInfo = New ConnectionInfo()
myConnectionInfo.ServerName = "my_dsn_file"
For your information this report has been made with CR 9 and converted to CR 2008
In CR 9 everything worked fine.
Any idea ?
Thanks

Answer 1

This Forum edito  is buggy ? I had to split my answer otherwise the format is broken
Also you wrote: "User used to create connection (throught DSN) is a generic user, not the user associated with the schema containing the view accessed by the report"
It's odd that this works in CR, CR repsects DB security so if it's not in a schema that user should not have access to anything in Oracle, I'm surprised it works at all. Possibly this is a bug in CR 8.5 and 9 that finally got fixed.
Work arounds, what is the reason you can't add that user account to a schema? Or use an account that has access?
I problably don't use the correct words (I'me not Oracle DBA + translation approximation).
Of course our user "application_user" has right on all the schema of the database, what I want to say it's when you connect to Oracle with a user "application_user" you're connected in the schema corresponding to these user (so "application_user" schema).
And if you want to make request on a table / view from another schema you need to prefix table/view with the corresponding schema (Sale in my previous fictive example)
So in my case CR try to access "CommercialDocument" view in "application_user" schema but this view is not in  this schema, it is in "Sales" schema.
The correct way to access it is Sales.CommercialDocument, that what CR throught .net don't do, but do when run directly in CR developers.
Here is real example (fench name inside), those SQL request have been monitoring througt SQL monitor tools of TOAD :
Execution of postes.rpt report directly in CR :
Timestamp: 10:30:03.881
Successful logon attempt (session tag: 0x6464CB8)
username: 'APPLI_HUET'; database: 'DEV'
Timestamp: 10:30:03.881
SELECT VALUE FROM SYS.NLS_DATABASE_PARAMETERS WHERE PARAMETER = 'NLS_CHARACTERSET'
Timestamp: 10:30:03.896
SELECT VALUE FROM SYS.NLS_DATABASE_PARAMETERS WHERE PARAMETER = 'NLS_NCHAR_CHARACTERSET'
Timestamp: 10:30:03.975
SELECT "POSTES"."N_POSTE", "POSTES"."LIB_POSTE", "POSTES"."N_ETAB",
"POSTES"."N_ATELIER", "POSTES"."TPSID", "POSTES"."DT_DEB_ACTIF",
"POSTES"."DT_FIN_ACTIF", "ETAB"."ETAB" FROM   "COMMUN"."ETAB" "ETAB" INNER JOIN
"GESTION_DES_TEMPS"."POSTES" "POSTES" ON "ETAB"."N_ETAB"="POSTES"."N_ETAB"
WHERE  "POSTES"."N_ETAB"=2 ORDER BY "POSTES"."N_POSTE"
Timestamp: 10:50:29.178
Logoff (session tag: 0x6464CB8).