/// <summary>
/// Delete entities that implement iexpirablewithid and have expired based on server's system date
/// </summary>
/// <typeparam name="T">The type of entity</typeparam>
/// <param name="session">Sessionwrapper instance to act upon</param>
/// <returns></returns>
internal static long DeleteExpirableWithId <T>(this SessionWrapper session) where T : IExpirableWithId
{
var ids = session.Query <T>()
.Where(i => i.ExpireAt < session.Storage.UtcNow)
.Select(i => i.Id)
.ToList();
return(session.DeleteByInt32Id <T>(ids));
}
public static void DoActionByExpression <T>(this SessionWrapper session, Expression <Func <T, bool> > expr,
Action <T> action)
where T : IExpirableWithId
{
var entities = session.Query <T>().Where(expr);
foreach (var entity in entities)
{
action(entity);
}
}
/// <summary>
/// Delete entities that implement iexpirablewithid and have expired based on server's system date
/// </summary>
/// <typeparam name="T">The type of entity</typeparam>
/// <param name="session">Sessionwrapper instance to act upon</param>
/// <param name="cutOffDate"></param>
/// <returns></returns>
internal static long DeleteExpirableWithId <T>(this SessionWrapper session, DateTime cutOffDate)
where T : IExpirableWithId
{
var ids = session.Query <T>()
.Where(i => i.ExpireAt < cutOffDate)
.Select(i => i.Id)
.ToList();
return(session.DeleteByInt32Id <T>(ids));
}
/// <summary>
/// do an upsert into a table
/// </summary>
/// <typeparam name="T">The entity type to upsert</typeparam>
/// <param name="session">a SessionWrapper instance to act upon</param>
/// <param name="matchFunc">A function that returns a single instance of T</param>
/// <param name="changeAction">A delegate that changes specified properties of instance of T </param>
/// <param name="keysetAction">A delegate that sets the primary key properties of instance of T if we have to do an upsert</param>
public static void UpsertEntity <T>(this SessionWrapper session, Expression <Func <T, bool> > matchFunc,
Action <T> changeAction,
Action <T> keysetAction) where T : new()
{
var entity = session.Query <T>().SingleOrDefault(matchFunc);
if (entity == null)
{
entity = new T();
keysetAction(entity);
changeAction(entity);
session.Insert(entity);
}
else
{
changeAction(entity);
session.Update(entity);
}
session.Flush();
}
