NHibernate fluent mapping - specify tables at runtime? - nhibernate

Question

Question:
How can I pass a string representing a table name to an NHibernate ClassMap?
Details:
I have several databases which are almost the same, with some minor variations in table and view names. I would like to be able to handle these variations via configuration parameters in my app.config file. For example, I could specify the table names for a particular configuration using the following custom section:
<tableNames>
<add key="logicalTable1" value="ACTUAL_TABLE_1"/>
<add key="logicalTable2" value="ACTUAL_TABLE_2"/>
</tablenames>
Now, if I load these config parameters at runtime, how do I get the table name into the ClassMap (i.e.,
public class MyClassMap : ClassMap<MyClass>
{
public class MyClassMap()
{
Table("ACTUAL_TABLE_1"); // <--- HERE I WANT Table(logicaTable1)
...
}
Note: I am using Ninject to inject ISessionFactory -- not sure if this matters.

Answer 1

Unless I am missing something, you could just use the ConfigurationManager class:
public class MyClassMap()
{
var table = ConfigurationManager.AppSettings["logicalTable2"];
Table(table);
...
}
Your project would need to reference the System.Configuration assembly.
Update:
Or use a "TableNameProvider" class:
public interface ITableNameProvider
{
string LogicalTable1 { get; }
}
public class TableNameProvider : ITableNameProvider
{
public string LogicalTable1 { get { return ConfigurationManager.AppSettings["logicalTable1"]; } }
}
I'm not sure about exactly how to do this with Ninject, but assuming its like other containers:
public class MyClassMap()
{
var provider = GetMyContainer().GetInstance<ITableProvider>();
var table = provider.LogicalTable1;
Table(table);
...
}
This way you would just need to change your TableNameProvider class.
I'm not sure if you could inject a MappingFactory or something into Fluent-NHibernate to handle mapping file dependencies and true injection. Something to look into.