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Created a calculated field

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SultanOfSuede2

Post subject: Created a calculated field

Posted: Tue Mar 04, 2008 11:36 am

Newbie

Joined: Tue Mar 04, 2008 11:31 am
Posts: 1

I want to create a calculated filed based on the value of two separate fields that are strings (varchar in SQL Server). So, if field 1 has a value of "abc" and field 2 has "xyz", I want a single new field on my data object that is "abc (xyz)". I'm basically adding paranetheses around the "xyz" and joining it to "abc." I'm doing this for display purposes in an application I'm working on.

How do I do this in nHibernate?

TIA,

Ian

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FlukeFan

Post subject: Created a calculated field

Posted: Tue Mar 04, 2008 1:25 pm

Senior

Joined: Thu Jun 21, 2007 8:03 am
Posts: 127
Location: UK

Hi Ian,

I suspect there are multiple solutions to this. One solution might be to have a protected setter for your calculated field that doesn't actually do anything:

Code:

public virtual string Field1
{
    get { return _field1; }
    set { _field1 = value; }
}

public virtual string Field2
{
    get { return _field2; }
    set { _field2 = value; }
}

public virtual string CalculatedField
{
    get { return _field1 + " (" + _field2 + ")"; }
    protected set { }
}

And then map the calculated field as normal.

Regards,
Richard

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SteveMc

Post subject:

Posted: Tue Mar 04, 2008 7:52 pm

Regular

Joined: Wed Aug 15, 2007 7:37 am
Posts: 73

If this is just for display purposes it sounds wrong to put the calculated field in the database at all - just leave it as an unmapped readonly property.

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