vb.net - 从 SSIS 上的脚本任务执行时，Oracle 过程不返回结果

Question

我正在执行 Oracle 过程，该过程具有三个 OUTPUT 参数并以表类型变量返回结果。

这里的限制是，我不应该使用 ODBC、MSDAORA 提供程序来调用该过程。所以我打算使用 Oracle OLEDB 提供程序。

我能够成功执行该过程，但是当我检查时(当 dr.Read() 时)它没有返回任何记录。但我知道根据存储过程结果，它应该返回 66 条记录。

我对我的 Vb.net 代码有疑问......请提出一些建议......提前致谢。

    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)

. . . . . 

包定义

 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

首先，不要使用OleDb，句号。 Microsoft 告诉您使用特定于供应商的提供程序。使用 Oracle 的 ODP.NET。

其次，要从Oracle SP检索记录集，您需要返回refCursor。

编辑:此时我们知道您的参数是表格。要处理此问题，您需要将 p.CollectionType = OracleCollectionType.PLSQLAssociativeArray 添加到您的参数

您的代码本质上是这样的:

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;

我看到你正在执行匿名 block - 你不需要这样做，因为这会让事情变得复杂。您需要做的是使用vb.net直接执行包。

Bottom line: your current ORACLE code does nothing to output results to .NET. Remove anonymous block and you're in business.

这是处理您的过程类型的代码(在注释中阅读)

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

这是最重要的部分

最重要的部分是如何填充声明的类型。让我们来看看

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;

这(上面)可以工作。但这会失败:

v_num(0) := 1234567890;
v_num(1) := 2345678901;
v_num(2) := 3456789012;

最后，这将在一个条件下起作用

v_num(2) := 1234567890;
v_num(3) := 2345678901;
v_num(4) := 3456789012;

在这里，我们将在 p1.Value 中获得 4 个成员，但在索引 0 下，您将拥有 oracle null。所以，你需要在这里处理它(如果你有这样的情况)

' instead of this 
myP2Values(i) = Convert.ToInt64(oraNumbers(i).Value)
' you will need first to check 
If oraNumbers(i).IsNull Then 
. . . . 

所以，这里最主要的是，你的 pl/sql 表的索引是什么？!它需要从大于 0 的值开始，最好是从 1 开始。 如果您的索引包含跳过的数字，即 2,4， 6,8，所有这些空格都将成为返回oracle数组的一部分，并且其中将有oracle null

Here is some reference