Question

我在executereader行中出错。该错误显示内部.NET Framework数据提供程序错误30。

我要使用的代码是：

    Try
        Dim ss As String
        Dim oradb As String = "db credentials"
        Dim conn As New OracleConnection(oradb)
        conn.Open()
        Dim cmd As New OracleCommand
        cmd.Connection = conn
        cmd.CommandText = "select m.branch_code from abc m where m.pfno='123'"
        cmd.CommandType = CommandType.Text
        Dim dr As OracleDataReader = cmd.ExecuteReader()
        dr.Read()
        ss = dr.Item("branch_code")
        conn.Dispose()
    Catch ex As Exception           
        Throw ex
    End Try

详细的错误报告如下所示：

System.InvalidOperationException was caught  
HResult=-2146233079
 Message=Internal .Net Framework Data Provider error 30.
 Source=System.Data.OracleClient
StackTrace:
   at System.Data.ProviderBase.DbBuffer.Validate(Int32 offset, Int32 count)
   at System.Data.ProviderBase.DbBuffer.PtrToStringUni(Int32 offset)
   at System.Data.OracleClient.OciHandle.PtrToString(NativeBuffer buf)
   at System.Data.OracleClient.OracleInternalConnection.get_ServerVersion()
   at System.Data.OracleClient.OracleInternalConnection.get_ServerVersionAtLeastOracle8()
   at System.Data.OracleClient.OracleConnection.get_ServerVersionAtLeastOracle8()
   at System.Data.OracleClient.OracleColumn.Describe(Int32& offset, OracleConnection connection, OciErrorHandle errorHandle)
   at System.Data.OracleClient.OracleDataReader.FillColumnInfo()
   at System.Data.OracleClient.OracleDataReader..ctor(OracleCommand command, OciStatementHandle statementHandle, String statementText, CommandBehavior commandBehavior)
   at System.Data.OracleClient.OracleCommand.ExecuteReader(CommandBehavior behavior)
   at System.Data.OracleClient.OracleCommand.ExecuteDbDataReader(CommandBehavior behavior)
   at System.Data.Common.DbCommand.System.Data.IDbCommand.ExecuteReader(CommandBehavior behavior)
   at System.Data.Common.DbDataAdapter.FillInternal(DataSet dataset, DataTable[] datatables, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior)
   at System.Data.Common.DbDataAdapter.Fill(DataSet dataSet, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior)
   at System.Data.Common.DbDataAdapter.Fill(DataSet dataSet)
   at Mylogin.GetMapIDEfftdate() in D:\Projects\BranchManager 22-11-2018\BranchManager\Mylogin.aspx.vb:line 247

InnerException：

我正在使用Oracle Database Client 11g R2。

Answer 1

就我而言，unicode功能已在oracleDB中启用，但是我在连接字符串中再次提到了unicode="TRUE"。因此，当我删除它时，.Net正常工作。

因此，您应该咨询数据库团队是否对数据库进行了任何新更新。

捕获到System.InvalidOperationException HResult = -2146233079消息=内部.Net Framework数据提供程序错误30

1 个答案: