如何通过criteriaBuilder为NHibernate在SqlLite中执行modulo

Question

I need to verify if the value of a field is even , I use SqlLite as Database, I tryed with

var sqlf= Projections.SqlFunction(“mod”, NHibernateUtil.Int32, Projections.ProjectionList().Add(Projections.Property(nameof(GsProcedure.Number))).Add(Projections.Constant(“2”)));

criteriaBuilder.Add(Restrictions.Eq(sqlf, 0));

but this create a request like this: “WHERE mod(this_.PRO_NO AS y0_, 2) = 0” and it is not executable by sqlLite which accepts only “where PRO_NO%2=0” Do you know what should I do?

var sqlf= Projections.SqlFunction(“mod”, NHibernateUtil.Int32, Projections.ProjectionList().Add(Projections.Property(nameof(GsProcedure.Number))).Add(Projections.Constant(“2”))); criteriaBuilder.Add(Restrictions.Eq(sqlf, 0));

but this create a request like this: “WHERE mod(this_.PRO_NO AS y0_, 2) = 0” and it is not executable by sqlLite which accepts only “where PRO_NO%2=0”

Answer 1

You shouldn't wrap projection parameters for Projections.SqlFunction in ProjectionList :

var sqlf= Projections.SqlFunction(
 "mod",
 NHibernateUtil.Int32,
 Projections.Property(nameof(GsProcedure.Number)), 
 Projections.Constant("2"));

Other than that your query looks correct and should work since NHibernate 3.2. Please make sure that you use SQLiteDialect in your session factory configuration.