Oracle procedure is not returning results when executing from script task on SSIS - vb.net

Question

I'm executing Oracle procedure, which has three OUTPUT parameters and returns results in table type variable.
Here the limitations are, i should not use ODBC, MSDAORA providers to call the procedure. So I'm planning to using Oracle OLEDB provider.
I'm able to execute the procedure successfully, but when i do check (while dr.Read()) its not returning any records. But I know as per stored procedure results, it should return 66 records.
I doubt about my Vb.net code.... Please suggest something.. Thanks in advance.
Private Sub GetClients()
Dim cmd As New OracleCommand("PKG_HOBS.PRC_HOBS_GET_CLIENTID", FPP1_Connection)
cmd.CommandType = CommandType.StoredProcedure
Dim p1 As New OracleParameter(":obus_grp_id", OracleDbType.Int32, ParameterDirection.Output)
p1.CollectionType = OracleCollectionType.PLSQLAssociativeArray
p1.Size = 100 ' This is the size of items in array in THIS case
cmd.Parameters.Add(p1)
Dim p2 As New OracleParameter(":ostat_c", OracleDbType.Int32, ParameterDirection.Output)
p2.CollectionType = OracleCollectionType.PLSQLAssociativeArray
p2.Size = 100 ' This is the size of items in array in THIS case
cmd.Parameters.Add(p2)
Dim p3 As New OracleParameter(":ostat_msg_x", OracleDbType.Varchar2, ParameterDirection.Output)
p3.CollectionType = OracleCollectionType.PLSQLAssociativeArray
p3.Size = 100 ' This is the size of items in array in THIS case
p3.ArrayBindSize = Enumerable.Repeat(500, 100).ToArray
cmd.Parameters.Add(p3)
cmd.ExecuteNonQuery()
Dim oraNumbers1() As OracleDecimal = CType(p1.Value, OracleDecimal())
Dim myobus_grp_idValues(oraNumbers1.Length - 1) As Integer
For i As Integer = 0 To oraNumbers1.Length - 1
myobus_grp_idValues(i) = Convert.ToInt32(oraNumbers1(i).Value)
Next
Dim oraNumbers2() As OracleDecimal = CType(p2.Value, OracleDecimal())
Dim myostat_cValues(oraNumbers2.Length - 1) As Integer
For i As Integer = 0 To oraNumbers2.Length - 1
myostat_cValues(i) = Convert.ToInt32(oraNumbers2(i).Value)
Next
Dim oraStrings() As OracleString = CType(p3.Value, OracleString())
Dim myostat_msg_xValues(oraStrings.Length - 1) As String
For i As Integer = 0 To oraStrings.Length - 1
myostat_msg_xValues(i) = oraStrings(i).Value
Next
Try
MessageBox.Show(myobus_grp_idValues.ToString)
. . . . .
Package definition
TYPE Tnumber IS TABLE OF NUMBER INDEX BY BINARY_INTEGER;
TYPE Tmsg_500 IS TABLE OF VARCHAR2(500) INDEX BY BINARY_INTEGER;
PROCEDURE prc_hobs_get_clientid (
obus_grp_id OUT Tnumber,
ostat_c OUT Tnumber,
ostat_msg_x OUT Tmsg_500);

Answer 1

First of all, don't use OleDb, period. Microsoft tells you to use vendor-specific provider. Use Oracle's ODP.NET.
Second, to retrieve recordset from Oracle SP, you need to return refCursor.
Edit: At this time we know that your parameters are tables. To process this you need to add p.CollectionType = OracleCollectionType.PLSQLAssociativeArray to your parameters
Your code is essentially this:
Declare
obus_grp_id PKG_HOBS.Tnumber; -- numeric table value
ostat_c PKG_HOBS.Tnumber; -- numeric table value
ostat_msg_x PKG_HOBS.Tmsg_500; -- string table value
BEGIN
PKG_HOBS.PRC_HOBS_GET_CLIENTID(obus_grp_id, ostat_c, ostat_msg_x);
END;
I see you executing anonymous block - you don't need to do this as this complicates things to you. What you need to do is use vb.net to execute package straight.
Bottom line: your current ORACLE code does nothing to output results to .NET. Remove anonymous block and you're in business.
Here is the code to process your type of procedure (read in comments)
Dim cmd As New OracleCommand("PKG_HOBS.PRC_HOBS_GET_CLIENTID", conn)
cmd.CommandType = CommandType.StoredProcedure
Dim p1 As New OracleParameter(":p1", OracleDbType.Int64, ParameterDirection.Output)
p1.CollectionType = OracleCollectionType.PLSQLAssociativeArray
p1.Size = 100 ' Declare more than you expect
' This line below is not needed for numeric types (date too???)
' p1.ArrayBindSize = New Integer(99) {}
cmd.Parameters.Add(p1)
' Add parameter 2 here - same as 1
Dim p3 As New OracleParameter(":p3", OracleDbType.Varchar2, ParameterDirection.Output)
p3.CollectionType = OracleCollectionType.PLSQLAssociativeArray
p3.Size = 100 ' Declare more than you expect
' for string data types you need to allocate space for each element
p3.ArrayBindSize = Enumerable.Repeat(500, 100).ToArray() ' get 100 elements of 500 - size of returning string
' I don't know why you have problems referencing System.Linq but if you do...
'Dim intA() As Integer = New Integer(99) {}
'For i as integer = 0 to intA.Length -1
' intA(i) = 500
'Next
cmd.Parameters.Add(p3)
conn.Open()
cmd.ExecuteNonQuery()
' Ora number is not compatible to .net types. for example integer is something
' between number(9) and (10). So, if number(10) is the type - you get Long in
' return. Therefore use "Convert"
' Also, you return arrays, so you need to process them as arrays - NOTE CHANGES
Dim oraNumbers() As OracleDecimal = CType(p1.Value, OracleDecimal())
Dim myP1Values(oraNumbers.Length - 1) As Long
For i as Integer = 0 To oraNumbers.Length - 1
myP1Values(i) = Convert.ToInt64(oraNumbers(i).Value)
Next
oraNumbers = CType(p2.Value, OracleDecimal())
Dim myP2Values(oraNumbers.Length - 1) As Long
For i as Integer = 0 To oraNumbers.Length - 1
myP2Values(i) = Convert.ToInt64(oraNumbers(i).Value)
Next
Dim oraStrings() As OracleString= CType(p3.Value, OracleString())
Dim myP3Values(oraStrings.Length - 1) As String
For i as Integer = 0 To oraStrings.Length - 1
myP3Values(i) = oraStrings(i).Value
Next
And this is Most Important part
The most important part is how you fill your declared type. Lets take
TYPE Tnumber IS TABLE OF NUMBER INDEX BY BINARY_INTEGER;
v_num Tnumber;
v_num(1) := 1234567890;
v_num(2) := 2345678901;
v_num(3) := 3456789012;
This (above) will work. But this will fail:
v_num(0) := 1234567890;
v_num(1) := 2345678901;
v_num(2) := 3456789012;
And finally, this, will work with one condition
v_num(2) := 1234567890;
v_num(3) := 2345678901;
v_num(4) := 3456789012;
Here we will get 4 members in p1.Value but under index 0 you will have oracle null. So, you would need to deal with it here (if you have such condition)
' instead of this
myP2Values(i) = Convert.ToInt64(oraNumbers(i).Value)
' you will need first to check
If oraNumbers(i).IsNull Then
. . . .
So, the principal thing here is, WHAT is the index of your pl/sql table?! It needs to start from something larger than 0, and preferably from 1. And if you have index with skipped numbers, i.e. 2,4,6,8, all those spaces will be part of returning oracle array and there will be oracle null in them
Here is some reference