[Mono-list] ASP.NET and System.Data.OracleClient help

Michael stuff@dustsmoke.com
Thu, 24 Jun 2004 01:24:44 -0700 (MST)
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I cannot seem to get datagrids with the oracle client working even thou I
do not seem to have problems using the datareader exclusivly. Mostly I am
just trying to test this out as I am not really a .NET person yet. It
seems like it is having problems filling the dataset and with the
datasource. Anyways in the midst of trying this, I tried bytefx with
mysql. I didn't have any problems with like code translated.

Can anybody tell me what I am doing wrong? Or is this a bug?

Example code below;

-Mike


ADAPTER --------------------------------------------------
<%@ Page Language="c#" %>
<%@ Import Namespace="System.Data" %>
<%@ Assembly name="System.Data.OracleClient" %>
<%@ Import Namespace="System.Data.OracleClient" %>
<script runat="server">
private void Page_Load(object sender, System.EventArgs e)
{
    String strConn = "Data Source=oracle;User Id=me;Password=pass;";
    String strSql = "SELECT * FROM me.names";

    OracleConnection objConn = new OracleConnection(strConn);
    OracleDataAdapter dataAdapter = new OracleDataAdapter();
    dataAdapter.SelectCommand = new OracleCommand(strSql, objConn);
    DataSet dataSet = new DataSet();

    dataAdapter.Fill(dataSet);
    dtgOracle.DataSource = dataSet;
    dtgOracle.DataBind();
}
</script>

<html>
  <head>
    <title>Mono DataGrid Example</title>
  </head>
  <body>
      <asp:DataGrid runat="server" id="dtgOracle"
                BackColor="#eeeeee" Width="100%"
                HorizontalAlign="Center"
                Font-Size="10pt">
        <HeaderStyle BackColor="Black" ForeColor="White"
               Font-Bold="True" HorizontalAlign="Center" />
        <AlternatingItemStyle BackColor="White" />
      </asp:DataGrid>
  </body>
</html>
--------------------------------------------------



Returns this;
ADAPTER--------------------------------------------------
Description: Error processing request.

Error Message: HTTP 500.

Stack Trace:

System.NullReferenceException: Object reference not set to an instance of
an object
in <0x0000a> System.Data.OracleClient.Oci.OciHandle:op_Implicit
(System.Data.OracleClient.Oci.OciHandle)
in <0x0006a> System.Data.OracleClient.Oci.OciHandle:GetAttributeSByte
(System.Data.OracleClient.Oci.OciAttributeType,System.Data.OracleClient.Oci.OciErrorHandle)
in <0x00031> System.Data.OracleClient.Oci.OciParameterDescriptor:GetScale ()
in <0x001ee> System.Data.OracleClient.OracleDataReader:GetSchemaTable ()
in <0x000e8> System.Data.Common.DbDataAdapter:BuildSchema
(System.Data.IDataReader,System.Data.DataTable,System.Data.SchemaType)
in <0x0007e> (wrapper remoting-invoke-with-check)
System.Data.Common.DbDataAdapter:BuildSchema
(System.Data.IDataReader,System.Data.DataTable,System.Data.SchemaType)
in <0x00086> System.Data.Common.DbDataAdapter:FillTable
(System.Data.DataTable,System.Data.IDataReader,int,int,int&)
in <0x000b8> (wrapper remoting-invoke-with-check)
System.Data.Common.DbDataAdapter:FillTable
(System.Data.DataTable,System.Data.IDataReader,int,int,int&)
in <0x00184> System.Data.Common.DbDataAdapter:Fill
(System.Data.DataSet,string,System.Data.IDataReader,int,int)
in <0x000dc> System.Data.Common.DbDataAdapter:Fill
(System.Data.DataSet,int,int,string,System.Data.IDbCommand,System.Data.CommandBehavior)
in <0x00047> System.Data.Common.DbDataAdapter:Fill (System.Data.DataSet)
in <0x000e8> ASP.datagrid_reader_aspx:Page_Load (object,System.EventArgs)
in <0x0006a> (wrapper delegate-invoke)
System.MulticastDelegate:invoke_void_object_EventArgs
(object,System.EventArgs)
in <0x00075> System.Web.UI.Control:OnLoad (System.EventArgs)
in <0x00024> System.Web.UI.Control:LoadRecursive ()
in <0x0018c> System.Web.UI.Page:InternalProcessRequest ()
in <0x000c2> System.Web.UI.Page:ProcessRequest (System.Web.HttpContext)
in <0x002e8> ExecuteHandlerState:Execute ()
in <0x00084> StateMachine:ExecuteState
(System.Web.HttpApplication/IStateHandler,bool&)
------------------------------------------------------








Also, if I try to use the datareader to fill a datagrid
READER------------------------------------------------------
<%@ Page Language="c#" %>
<%@ Import Namespace="System.Data" %>
<%@ Assembly name="System.Data.OracleClient" %>
<%@ Import Namespace="System.Data.OracleClient" %>
<script runat="server">

private void Page_Load(object sender, System.EventArgs e)
{

    String strConn = "Data Source=oracle;User Id=me;Password=pass;";
    String strSql = "SELECT * FROM names";

    OracleConnection objConn = new OracleConnection(strConn);
    OracleCommand objCommand = new OracleCommand(strSql, objConn);

    objConn.Open();
    dtgOracle.DataSource = objCommand.ExecuteReader();
    dtgOracle.DataBind();
    objConn.Close();
}

</script>

<html>
  <head>
    <title>Mono DataGrid Example</title>
  </head>
  <body>
      <asp:DataGrid runat="server" id="dtgOracle"
                BackColor="#eeeeee" Width="100%"
                HorizontalAlign="Center"
                Font-Size="10pt">
        <HeaderStyle BackColor="Black" ForeColor="White"
               Font-Bold="True" HorizontalAlign="Center" />
        <AlternatingItemStyle BackColor="White" />
      </asp:DataGrid>
  </body>
</html>
---------------------------------------------------

I recieve a
READER---------------------------------------------------
System.NullReferenceException: Object reference not set to an instance of
an object
in <0x0000a> System.Data.OracleClient.Oci.OciHandle:op_Implicit
(System.Data.OracleClient.Oci.OciHandle)
in <0x0006a> System.Data.OracleClient.Oci.OciHandle:GetAttributeSByte
(System.Data.OracleClient.Oci.OciAttributeType,System.Data.OracleClient.Oci.OciErrorHandle)
in <0x00031> System.Data.OracleClient.Oci.OciParameterDescriptor:GetScale ()
in <0x001ee> System.Data.OracleClient.OracleDataReader:GetSchemaTable ()
in <0x00081> System.Data.Common.DbEnumerator:.ctor
(System.Data.IDataReader,bool)
in <0x00012> System.Data.Common.DbEnumerator:.ctor (System.Data.IDataReader)
in <0x00020>
System.Data.OracleClient.OracleDataReader:System.Collections.IEnumerable.GetEnumerator
()
in <0x00572> System.Web.UI.WebControls.PagedDataSource:GetEnumerator ()
in <0x0016c> System.Web.UI.WebControls.DataGrid:AutoCreateColumns
(System.Web.UI.WebControls.PagedDataSource)
in <0x00133> System.Web.UI.WebControls.DataGrid:CreateColumnSet
(System.Web.UI.WebControls.PagedDataSource,bool)
in <0x00541> System.Web.UI.WebControls.DataGrid:CreateControlHierarchy (bool)
in <0x0004a> System.Web.UI.WebControls.BaseDataList:OnDataBinding
(System.EventArgs)
in <0x00010> System.Web.UI.WebControls.BaseDataList:DataBind ()
in <0x000c1> ASP.datagrid_reader_aspx:Page_Load (object,System.EventArgs)
in <0x0006a> (wrapper delegate-invoke)
System.MulticastDelegate:invoke_void_object_EventArgs
(object,System.EventArgs)
in <0x00075> System.Web.UI.Control:OnLoad (System.EventArgs)
in <0x00024> System.Web.UI.Control:LoadRecursive ()
in <0x0018c> System.Web.UI.Page:InternalProcessRequest ()
in <0x000c2> System.Web.UI.Page:ProcessRequest (System.Web.HttpContext)
in <0x002e8> ExecuteHandlerState:Execute ()
in <0x00084> StateMachine:ExecuteState
(System.Web.HttpApplication/IStateHandler,bool&)
---------------------------------------------------------------








However, something like the example runs fine.
---------------------------------------------------------------
<%@ Page Language="c#" %>
<%@ Import Namespace="System.Data" %>
<%@ Assembly name="System.Data.OracleClient" %>
<%@ Import Namespace="System.Data.OracleClient" %>
<%
String strConn = "Data Source=oracle;User ID=me;Password=pass;";
OracleConnection dbcon = new OracleConnection(strConn);
dbcon.Open ();

OracleCommand dbcmd = dbcon.CreateCommand();
string sql = "Select * From CIS440_Demo.names";
dbcmd.CommandText = sql;

OracleDataReader reader = dbcmd.ExecuteReader();
%>
<html>
<head>
<title>Example Oracle Connection</title>
</head>
<body>
<table border="1" width="100%" id="table1">
        <tr>
                <td><b>Faculty Number</b></td>
                <td><b>Last Name</b></td>
                <td><b>First Name</b></td>
        </tr><%
        while (reader.Read ()) {
        %>
        <tr>
                <td><%=reader["id"]%>&nbsp;</td>
                <td><%=reader["lastname"]%>&nbsp;</td>
                <td><%=reader["firstname"]%>&nbsp;</td>
        </tr>
        <% } %>
</table>
</body>
</html>
<%
reader.Close ();
reader = null;
dbcmd.Dispose ();
dbcmd = null;
dbcon.Close ();
dbcon = null;
%>
--------------------------------------------------------
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