Ibatis 1.3.0 / ODP 10g : NUMBER dbType - Double/Decimal .NET Type

[ni...@bnpparibas.com]

Hi

I am migrating my application from MIcrosoft Oracle Provider
(System.Data.OracleClient) to ODP 10.0.4  (Oracle.DataAccess). and I
experiment some problems with NUMBER dbType.

According to the ODP Documentation, NUMBER should be read with the
OracleDataAdapter.GetDecimal() method and not
OracleDataAdapter.GetDouble(). With MS Provider, GetDouble works propoerly

Unfortunately, all my C# objects use double type. with MS Provider, I let
the AutoMapReader map the query result into my object properties. But with
ODP, it does not work anymore :(  Indeed, The AutoMapReader still use
GetDouble.

So, Can Ibatis convert decimal to double for me at the mapping step ? Do I
write a Custom Type Handlers  ? or is the any other solution more clever ?

Obviously, I can replace in my code all double type to Decimal type, and
add everywhere some Convert.ToDouble to avoid interface modfication but is
is quite boring.

Regards



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Re: Ibatis 1.3.0 / ODP 10g : NUMBER dbType - Double/Decimal .NET Type

[Ron Grabowski <ro...@yahoo.com>]

This will automatically convert to/from C#'s DateTime.MinValue to NULL.

public class NullDateTimeTypeHandlerCallback : ITypeHandlerCallback
{
 public object ValueOf(string nullValue)
 {
  return nullValue;
 }

 public object GetResult(IResultGetter getter)
 {
  if (getter.Value.Equals(System.DBNull.Value))
  {
   return DateTime.MinValue;
  }
  else
  {
   return getter.Value;
  }
 }

 public void SetParameter(IParameterSetter setter, object parameter)
 {
  if (parameter.Equals(DateTime.MinValue))
  {
   setter.Value = System.DBNull.Value;
  }
  else
  {
   setter.Value = parameter;
  }
 }
}

<typeHandlers>
 <typeHandler
  type="DateTime"
  callback="Company.Project.NullDateTimeTypeHandlerCallback" />
</typeHandlers>

--- Gilles Bayon <ib...@gmail.com> wrote:

> Bonjour Nicolas
> 
> The best solution is to use a custom type handler that overrides
> IBatisNet's
> DecimalTypeHandler
> 
> <typeHandlers>
>   <typeHandler
>    type="System.Decimal"
>    handler="CustomDoubleTypeHanlder" />
> </typeHandlers> (in SqlMap.config)
> 
> Ron use such a solution to overrides IBatisNet's DateTimeTypeHandler.
> 
> Cheers
> -Gilles
> 
> On 1/11/06, nicolas.theron@bnpparibas.com
> <ni...@bnpparibas.com>
> wrote:
> >
> >
> > Hi
> >
> > I am migrating my application from MIcrosoft Oracle Provider
> > (System.Data.OracleClient) to ODP 10.0.4  (Oracle.DataAccess). and
> I
> > experiment some problems with NUMBER dbType.
> >
> > According to the ODP Documentation, NUMBER should be read with the
> > OracleDataAdapter.GetDecimal() method and not
> > OracleDataAdapter.GetDouble(). With MS Provider, GetDouble works
> propoerly
> >
> > Unfortunately, all my C# objects use double type. with MS Provider,
> I let
> > the AutoMapReader map the query result into my object properties.
> But with
> > ODP, it does not work anymore :(  Indeed, The AutoMapReader still
> use
> > GetDouble.
> >
> > So, Can Ibatis convert decimal to double for me at the mapping step
> ? Do I
> > write a Custom Type Handlers  ? or is the any other solution more
> clever ?
> >
> > Obviously, I can replace in my code all double type to Decimal
> type, and
> > add everywhere some Convert.ToDouble to avoid interface modfication
> but is
> > is quite boring.
> >
> > Regards
> >
> 

Re: Ibatis 1.3.0 / ODP 10g : NUMBER dbType - Double/Decimal .NET Type

[Gilles Bayon <ib...@gmail.com>]

Bonjour Nicolas

The best solution is to use a custom type handler that overrides IBatisNet's
DecimalTypeHandler

<typeHandlers>
  <typeHandler
   type="System.Decimal"
   handler="CustomDoubleTypeHanlder" />
</typeHandlers> (in SqlMap.config)

Ron use such a solution to overrides IBatisNet's DateTimeTypeHandler.

Cheers
-Gilles

On 1/11/06, nicolas.theron@bnpparibas.com <ni...@bnpparibas.com>
wrote:
>
>
> Hi
>
> I am migrating my application from MIcrosoft Oracle Provider
> (System.Data.OracleClient) to ODP 10.0.4  (Oracle.DataAccess). and I
> experiment some problems with NUMBER dbType.
>
> According to the ODP Documentation, NUMBER should be read with the
> OracleDataAdapter.GetDecimal() method and not
> OracleDataAdapter.GetDouble(). With MS Provider, GetDouble works propoerly
>
> Unfortunately, all my C# objects use double type. with MS Provider, I let
> the AutoMapReader map the query result into my object properties. But with
> ODP, it does not work anymore :(  Indeed, The AutoMapReader still use
> GetDouble.
>
> So, Can Ibatis convert decimal to double for me at the mapping step ? Do I
> write a Custom Type Handlers  ? or is the any other solution more clever ?
>
> Obviously, I can replace in my code all double type to Decimal type, and
> add everywhere some Convert.ToDouble to avoid interface modfication but is
> is quite boring.
>
> Regards
>