Entity Framework Procedure Error - Silverlight, EF, Oracle - entity-framework

Question

Error Message:
The data reader returned by the store data provider does not have enough columns for the query requested.
public ObjectResult<global::System.String> P_GET_MST_CODE(global::System.String i_RES_TYPE, ObjectParameter v_RESULT)
{
ObjectParameter i_RES_TYPEParameter;
if (i_RES_TYPE != null)
{
i_RES_TYPEParameter = new ObjectParameter("I_RES_TYPE", i_RES_TYPE);
}
else
{
i_RES_TYPEParameter = new ObjectParameter("I_RES_TYPE", typeof(global::System.String));
}
return base.ExecuteFunction<global::System.String>("P_GET_MST_CODE", i_RES_TYPEParameter, v_RESULT);
}
Below is the definition of the stored procedure.
<Function Name="P_GET_MST_CODE" Aggregate="false" BuiltIn="false" NiladicFunction="false" IsComposable="false" ParameterTypeSemantics="AllowImplicitConversion" Schema="LEGACY">
<Parameter Name="I_RES_TYPE" Type="varchar2" Mode="In" />
<Parameter Name="V_RESULT" Type="varchar2" Mode="Out" />
</Function>
Can anyone help me to solve this problem?

Answer 1

I've solved this by avoiding entity connection object. :-)
Until now, It seems to be unsupported for OUT Parameter of ORACLE Database.
Below is the changed code example.
using System.Data;
using System.Data.Common;
using System.Data.EntityClient;
using System.ServiceModel.DomainServices.EntityFramework;
using System.ServiceModel.DomainServices.Server;
using Oracle.DataAccess.Client;
.......
[Invoke]
public string method(string OTL)
{
DbCommand cmd = (((EntityConnection)this.ObjectContext.Connection).StoreConnection).CreateCommand();
cmd.CommandType = System.Data.CommandType.StoredProcedure;
cmd.CommandText = "LoveMe";
OracleParameter ep = new OracleParameter("I_RES_TYPE", OTL);
ep.OracleDbType = OracleDbType.Varchar2;
ep.Direction = ParameterDirection.Input;
OracleParameter epV_RESULT = new OracleParameter("V_RESULT", null);
epV_RESULT.OracleDbType = OracleDbType.Varchar2;
epV_RESULT.Size = 30;
epV_RESULT.Direction = ParameterDirection.Output;
cmd.Parameters.Add(ep);
cmd.Parameters.Add(epV_RESULT);
cmd.Connection.Open();
cmd.ExecuteNonQuery();
string result = cmd.Parameters[1].Value.ToString(); //What I want to get.
cmd.Connection.Close();
return result;
}