在VB.NET中使用dbms_output.get_line [英] Using dbms_output.get_line in VB.NET

问题描述

我有一些存储过程可以执行，这些存储过程使用dbms_output.put_line()将数据放入输出缓冲区.

I have some stored procedures to execute that use dbms_output.put_line() to put data into the output buffer.

我知道我需要使用dbms_output.get_line(:line, :status)来检索该输出. 我正在使用System.Data.OracleClient来避免Oracle部署的麻烦.

I know I need to use dbms_output.get_line(:line, :status) to retrieve that output. I'm using System.Data.OracleClient to avoid headaches with Oracle deployment.

那么我下面的代码在做什么?

So what am I doing wrong with the code below?

Dim cmdSproc As OracleCommand = cnOracle.CreateCommand()
Dim strOracle As New OracleString()
Dim opaLine As New OracleParameter("lineOut", OracleType.VarChar, 255)
opaLine.Direction = ParameterDirection.Output
Dim opaStatus As New OracleParameter("status", 0)
cmdSproc.CommandText = "begin dbms_output.get_line(:lineOut,:status); end;"
cmdSproc.Parameters.Add(opaLine)
cmdSproc.Parameters.Add(opaStatus)

Dim strOutput As String = ""
strOracle = "0"
Try
   While strOracle = "0"
      cmdSproc.ExecuteOracleNonQuery(strOracle)
      strOutput = strOutput & strOracle.ToString() & vbNewLine
   End While
Catch ex As Exception
   MsgBox(ex.Message)
End Try

推荐答案

这是我的工作方式:(找到它

Here's how I got it to work: (found it here)

Dim cmdGetOutput As New OracleCommand("declare " & _
    " l_line varchar2(255); " & _
    " l_done number; " & _
    " l_buffer long; " & _
    "begin " & _
    " loop " & _
    " exit when length(l_buffer)+255 > :maxbytes OR l_done =1; " & _
    " dbms_output.get_line( l_line, l_done ); " & _
    " l_buffer := l_buffer || l_line || chr(10); " & _
    " end loop; " & _
    " :done := l_done; " & _
    " :buffer := l_buffer; " & _
    "end;", cnOracle)
cmdGetOutput.Parameters.Add("maxbytes", OracleType.Int16)
cmdGetOutput.Parameters("maxbytes").Value = 32000
cmdGetOutput.Parameters.Add("done", OracleType.Int16)
cmdGetOutput.Parameters("done").Direction = ParameterDirection.Output
cmdGetOutput.Parameters.Add("buffer", OracleType.LongVarChar, 32000)
cmdGetOutput.Parameters("buffer").Direction = ParameterDirection.Output

Dim strOutput As String = ""
Dim intStatus As Integer = 0
Try
   While True
      cmdGetOutput.ExecuteNonQuery()
      strOutput = strOutput & cmdGetOutput.Parameters("buffer").Value & vbNewLine
      If cmdGetOutput.Parameters("done").Value = 1 Then
         Exit While
      End If
   End While
Catch ex As Exception
   MsgBox(ex.Message)
Finally
   MsgBox(strOutput)
   cnOracle.Close()
End Try

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