OraException from Command.ExecuteReader with SELECT DISTINCT
Hello
I am trying to fill an OraDataReader object from a OraCommand object.
It appears that whenever the statement includes a SELECT DISTINCT, the command fails (even though the SQL statement works fine when executed e.g. in TOAD)
Dim Conn As OraConnection = New Oracle.DataAccess.Client.OraConnection("[Valid connection string]")
Conn.Open()
Dim Command As OraCommand = New OraCommand()
Command.CommandType = CommandType.Text
Command.CommandText = "select DISTINCT nvl(SUBFAMILY_COMPETENCY_ID, 0) SUBFAMILY_ID, nvl(NAME, ' ') NAME, FAMILY_COMPETENCY_ID FAMILY_ID " & _
" from TAXONOMY_RELATIONAL, COMPETENCY " & _
" where TAXONOMY_RELATIONAL.CL_ID = :1 " & _
" AND COMPETENCY.cl_id (+) = TAXONOMY_RELATIONAL.cl_id and COMPETENCY.language_id (+) = :2 " & _
" and COMPETENCY.COMPETENCY_ID (+) = TAXONOMY_RELATIONAL.SUBFAMILY_COMPETENCY_ID " & _
" order by FAMILY_ID, SUBFAMILY_ID"
Command.Parameters.Add("@CL_ID", context.Session!CLID)
Command.Parameters.Add("@LANGUAGE_ID", context.Session!LANGUAGEID)
Dim DataReader As OraDataReader = Command.ExecuteReader(CommandBehavior.CloseConnection)
An Oracle.DataAccess.Client.OraException is raised when executing the last statement, but no further details are given in the error message. The stack trace begins as follows
[OraException]()
Oracle.DataAccess.Client.OraException.HandleErrorHelper(Int32 errCode, OraConnection conn, IntPtr opsErrCtx, IntPtr opsSqlCtx, Object src, String procedure) +639
Oracle.DataAccess.Client.OraCommand.ExecuteReader(+737)
Oracle.DataAccess.Client.OraCommand.ExecuteReader(CommandBehavior behavior) +8
The exception disappears as soon as I remove the DISTINT keyword from my SQL statement.
Is this a bug or am I doing something wrong?
Thanks for help,
Bernt Fischer
This issue is same as the one mentioned in the thread with title "Problem with 'Select distinct'" and the fix would be available in the next release.
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