Castle ActiveRecord with multiple databases

Changhong Fu — Sun, 21 Sep 2008 12:07:51 GMT

A few months ago, I came cross this problem that I had 2 databases in my project, so that my model classes might map to tables from different databases. It took me a while to work out how to deal with it in ActiveRecord. Today, I had a same problem again, even though I still got my last project’s source code, it still took me a couple of hours to get everything right. So, I think I’d better to write it done, just in case that I will have to do it again or anyone else may need it.

The Scenario:

Database 1: MyDatabase Table: Product

Database 2: MyProfileDatabase Table: UserProfile

Model Class: Product, UserProfile

The Code:

First, just define Product class as normal ActiveRecord model class:

[ActiveRecord]

public class Product : ActiveRecordBase<Product>

{

[PrimaryKey("ProductID")]

public string Id { get; set; }

//...

}

Create an abstract base class for MyProfileDatabase. All classes map to tables in MyProfileDatabase will inherit from this base class. Note: it has to be abstract. This was what I missed out and caused some fun time to find out.

public abstract class ProfileActiveRecord<T> : ActiveRecordBase<T>

{

}

Define UserProfile class which inherits from ProfileActiveRecord.

[ActiveRecord]

public class UserProfile : ProfileActiveRecord<UserProfile>

{

[PrimaryKey("UserID")]

public int Id { get; set; }

//....

}

ActiveRecord Configration:

<add key="hibernate.connection.driver_class"

value="NHibernate.Driver.SqlClientDriver" />

<add key="hibernate.dialect"

value="NHibernate.Dialect.MsSql2005Dialect" />

<add key="hibernate.connection.provider"

value="NHibernate.Connection.DriverConnectionProvider" />

<add key="hibernate.connection.connection_string"

value="server=localhost;database=MyDatabase;Integrated Security=True" />

</config>

<add key="hibernate.connection.driver_class"

value="NHibernate.Driver.SqlClientDriver" />

<add key="hibernate.dialect"

value="NHibernate.Dialect.MsSql2005Dialect" />

<add key="hibernate.connection.provider"

value="NHibernate.Connection.DriverConnectionProvider" />

<add key="hibernate.connection.connection_string"

value="server=localhost; database=MyProfileDatabase; Integrated Security=True" />

</config>

</activerecord>

Initialize Active Records:

XmlConfigurationSource source = new XmlConfigurationSource("ActiveRecord.xml");

Type[] types =

{

typeof(Product),

typeof(ProfileActiveRecord<>),

typeof(UserProfile)

};

ActiveRecordStarter.Initialize(source, types);