NHibernate / MySQL-tekenreeksaaneenschakeling

Het volgende is een HqlGenerator die dit probleem oplost:

public class ConcatHqlGenerator : BaseHqlGeneratorForMethod
{
    public ConcatHqlGenerator()
        : base()
    {
        this.SupportedMethods = new[] 
        { ReflectionHelper.GetMethodDefinition(() => string.Concat(null, null)) };
    }

    public override HqlTreeNode BuildHql(MethodInfo method,
Expression targetObject,
ReadOnlyCollection<Expression> arguments,
HqlTreeBuilder treeBuilder,
IHqlExpressionVisitor visitor)
    {
        return treeBuilder.Concat(
            new[] 
            {
                visitor.Visit(arguments[0]).AsExpression(),
                visitor.Visit(arguments[1]).AsExpression()
            });
    }
}

Voeg dit toe aan uw HQLGeneratorsRegistry en u bent klaar om te gaan met oproepen naar string.Concat in uw LINQ-statements.

public class LinqToHqlGeneratorsRegistry : DefaultLinqToHqlGeneratorsRegistry
{
    public LinqToHqlGeneratorsRegistry()
        : base()
    {
        this.Merge(new ConcatHqlGenerator());
    }
}
private static ISessionFactory CreateSessionFactory()
{
    var configuration = new NHib.Cfg.Configuration();
    configuration.Properties.Add(NHibernate.Cfg
                                           .Environment.LinqToHqlGeneratorsRegistry, 
typeof(LinqToHqlGeneratorsRegistry).AssemblyQualifiedName);
    configuration.Configure();
    return configuration.BuildSessionFactory();
}