Alan Northam - All Comments

re: Getting Started with NHibernate: Part IV

tim — Fri, 10 Jul 2009 01:40:00 GMT

I have a Entity Object which has a IList<T> Property,but when it is passed to client Proxy object,

it become a T[],How to resolve it.

re: ADO.NET, Nullable Types, Casting DBNull and You

Anton — Fri, 05 Jun 2009 08:10:54 GMT

As Chris Forsyth said earlier.

Such construction as

instance.Property1 = row["Column1"] as DateTime?;

works correctly only in the case when internal ADO column representation type is the same as the casting type. No guarantee that this internal type corresponds to type that you want and will not changed in future .Net versions.

Another point that some databses have not corresponding types for .Net types.

For exmaple:

bool? myBool = row["Column1"] as bool?;

works correctly for MS SQL server (if DBType for Column1 is bit) and fails for Oracle server (for any type).

re: Getting Started with NHibernate: Part III

Yazid — Thu, 23 Apr 2009 11:35:13 GMT

Hello,

I would like to take to this opportunity to ask a question about one-to-many. I ahve two classes:

GeneralInformation and famousPlacesInLondon

public class GeneralInformation

{

private int id;

public virtual int Id

{

get { return id; }

set { id = value; }

}

private IList<FamousPlacesInLondon> famousPlacesOutLondon;

public virtual IList<FamousPlacesInLondon> FamousPlacesOutLondon

{

get { return famousPlacesOutLondon; }

set { famousPlacesOutLondon = value; }

}

public class FamousPlacesInLondon

{

private int id;

public virtual int Id

{

get { return id; }

set { id = value; }

}

private string link;

public virtual string Link

{

get { return link; }

set { link = value; }

}

private string title;

public virtual string Title

{

get { return title; }

set { title = value; }

}

My mapping are as follows:

<?xml version="1.0" encoding="utf-8" ?>

<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" assembly="Model" namespace="Model">

</id>

<one-to-many class="Model.FamousPlacesInLondon,Model"/>

</bag>

</class>

</hibernate-mapping>

<?xml version="1.0" encoding="utf-8" ?>

<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" assembly="Model" namespace="Model" >

</id>

</class>

</hibernate-mapping>

If I fill the GeneralInformation with data and do a save using NHibernate, everything gets inserted into the appropriate table, except the ForeignKey GeneralInformationId. What is wrong?

TIA

Yaz

re: Cache Revisited

anortham — Tue, 07 Apr 2009 17:02:49 GMT

Thomas:

Not sure where the tgz came from, that's out of my hands :)

That definitely needs refactoring. I'll update it asap.

re: Cache Revisited

Thomas G Mayfield — Tue, 07 Apr 2009 15:22:02 GMT

AutoComplete.zip.tgz? Covering your bases? :)

I see a section like that big (target != null) if block and can't help but suggesting a rewrite for clarity--one that tells you what each branch does differently, and that uses far fewer lines:

DateTime absoluteExpiration = Cache.NoAbsoluteExpiration;

TimeSpan slidingExpiration = Cache.NoSlidingExpiration;

switch( cacheExpiration )

{

case CacheExpiration.Sliding:

slidingExpiration = new TimeSpan( 0, cacheTimeInMinutes, 0 );

break;

case CacheExpiration.Absolute:

absoluteExpiration = DateTime.Now.AddMinutes(cacheTimeInMinutes);

break;

}

cache.Insert(key, target, null, absoluteExpiration, slidingExpiration, CacheItemPriority.Normal, OnRemove);

re: Cache Revisited

anortham — Sun, 05 Apr 2009 18:40:33 GMT

@Scott

If you look at my earlier post it is written just like that which requires T to be a reference type. In this case I tried to make it as flexible as possible so I left off that constraint. However you do have a possible exception. So take your pick, reference types only or a possible cast exception.

re: Cache Revisited

Scott Watermasysk — Sun, 05 Apr 2009 02:07:51 GMT

One item that jumps out at me is this:

var target = cache[key];

And then using return (T)target;.

You run the risk of finding an object based on the key but throwing an invalid cast exception.

Might want to consider:

var target = cache[key] as T;

Of course this limits you to reference types, but could save you a hard issue to debug later.

-Scott

re: Cache Revisited

anortham — Wed, 01 Apr 2009 14:43:06 GMT

@meisinger Yup, they got lost in the html river. I've added them back.

re: Cache Revisited

meisinger — Wed, 01 Apr 2009 14:31:34 GMT

is it my imagination or are there some missing angle brackets in your example code?

Cache Revisited - Alan Northam - Devlicio.us

DotNetShoutout — Wed, 01 Apr 2009 09:33:11 GMT

Thank you for submitting this cool story - Trackback from DotNetShoutout

re: Getting Started with NHibernate: Part III

JavaRanch — Tue, 10 Feb 2009 05:43:44 GMT

could u plz send me the difference between <bag> element

and the <property > element in .hbm.xml and when to use these tags

re: Getting Started with NHibernate: Part I

anortham — Mon, 09 Feb 2009 19:32:11 GMT

devlicio.us/.../getting-started-with-nhibernate-part-ii.aspx

re: Getting Started with NHibernate: Part IV

twister — Mon, 29 Dec 2008 07:40:42 GMT

Again me.

I solved this.

I manually added a record to Database Application table with name "NHBlog".

re: Getting Started with NHibernate: Part IV

twister — Fri, 26 Dec 2008 08:52:17 GMT

After some effort I can run it with vs.2008

But I cant still pass login page. Now error like this

"not-null property references a null or transient value: NHBlog.BusinessEntities.Security.User.Application"

in membership providers.

re: Getting Started with NHibernate: Part IV

twister — Thu, 25 Dec 2008 15:57:44 GMT

I cant run the application. It gives error in web.config about roleprovider.

Why do you think?