NHibernate create IMAGE instead VarBinary(max)

Question

I use the fallowing NHibernate Mapping (NH 3.2) with MS SQL Server 2008 (set MsSql2008Dialect):

<class name="Layout" table="Layout" lazy="false"  >
    <cache usage="read-write"/>
    <id name="Id" column="Id" type="Guid">      
                    <generator class="assigned"/>
    </id>
  <version name="ObjectVersion" column="ObjectVersion"/>
    <property name="Key" column="Key" type="String" length="255" not-null="true"  />
    <property name="Value" column="Value" type="BinaryBlob" length="2147483647"  />
    <property name="Created" column="Created" type="Timestamp" not-null="true" optimistic-lock="false" />
    <property name="CreatedBy" column="CreatedBy" type="String" length="255" not-null="true" optimistic-lock="false" />
    <property name="Changed" column="Changed" type="Timestamp" optimistic-lock="false" />
    <property name="ChangedBy" column="ChangedBy" type="String" length="255" optimistic-lock="false" />
    <many-to-one  name="User" class="User" foreign-key="FK_User_Layout" lazy="proxy" fetch="select">
        <column name="UserId"/>
    </many-to-one>
</class>

The Problem is here, that for the Column Value, NHibernate will create a Field of IMAGE. But I need VarBinary(max). What is wrong with the mapping?

possible duplicate of [How do I get fluent nhibernate to create a varbinary(max) field in sql server](http://stackoverflow.com/questions/1098266/how-do-i-get-fluent-nhibernate-to-create-a-varbinarymax-field-in-sql-server) or http://stackoverflow.com/q/4584170/27535 — gbn, Jul 09 '11 at 14:24

score 3 · Accepted Answer · answered Jan 26 '12 at 12:29

I have the same problem after migration from version 3.1 to 3.2. I think this is a bug. I have explored source code version 3.1 and 3.2 and have found some difference which changed initialization sequence for MsSqlDialect* classes. I fixed it by creating descendant of dialect class and overriding method "RegisterLargeObjectTypeMappings"

public class MyMsSql2008Dialect : MsSql2008Dialect
{
    protected override void RegisterLargeObjectTypeMappings()
    {
        base.RegisterLargeObjectTypeMappings();
        base.RegisterColumnType(DbType.Binary, 2147483647, "VARBINARY(MAX)");
    }
}

score 2 · Answer 2 · answered Jan 26 '12 at 13:48

2

Try this

<property name="Value">
    <column name="Value" sql-type="varbinary(max)" />
</property>

answered Jan 26 '12 at 13:48

hival

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NHibernate create IMAGE instead VarBinary(max)

2 Answers2