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Editorial Team
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Editorial Team
Asked: May 23, 20262026-05-23T01:10:24+00:00 2026-05-23T01:10:24+00:00

I am trying to use NHibernate to persist objects using Guids for their Ids

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I am trying to use NHibernate to persist objects using Guids for their Ids with the Oracle10g dialect and am getting the following exception: Could not determine type for: MyObject..., for columns: NHibernate.Mapping.Column(ID) (type is MappingException).

My class looks something like this:

public class MyObject
{
    public virtual Guid Id { get; set; }
    ...

I’ve tried several variations, but my mapping XML currently looks something like:

<class name="MyObject" table="MY_OBJECT">
  <id column="ID" name="Id"/>

The “ID” column in Oracle is of type RAW(16).

What am I doing wrong? I’ve tried using a custom UserType, but get the same error message. Any suggestions will be greatly appreciated.

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  1. Editorial Team
    Editorial Team
    2026-05-23T01:10:25+00:00Added an answer on May 23, 2026 at 1:10 am

    Have you seen mapping oracle raw

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