Custom SQL function for NHibernate dialect
- by Kristoffer Ahl
I want to be able to call a custom function called "recent_date" as part of my HQL. Like this: [Date] >= recent_date()
I created a new dialect, inheriting from MsSql2000Dialect and specified the dialect for my configuration.
public class NordicMsSql2000Dialect : MsSql2000Dialect
{
public NordicMsSql2000Dialect()
{
RegisterFunction(
"recent_date",
new SQLFunctionTemplate(
NHibernateUtil.Date,
"dateadd(day, -15, getdate())"
)
);
}
}
var configuration = Fluently.Configure()
.Database(
MsSqlConfiguration.MsSql2000
.ConnectionString(c => .... )
.Cache(c => c.UseQueryCache().ProviderClass<HashtableCacheProvider>())
.Dialect<NordicMsSql2000Dialect>()
)
.Mappings(m => ....)
.BuildConfiguration();
When calling recent_date() I get the following error:
System.Data.SqlClient.SqlException: 'recent_date' is not a recognized function name
I'm using it in a where statement for a HasMany-mapping like below.
HasMany(x => x.RecentValues)
.Access.CamelCaseField(Prefix.Underscore)
.Cascade.SaveUpdate()
.Where("Date >= recent_date()");
What am I missing here?
