protected bool SelectColumnsToBeLoaded()
{
var key = Key;
EntityState state;
if (!Manager.TryGetTupleOfNonRemovedEntity(ref key, out state))
{
return(false);
}
var tuple = state == null ? null : state.Tuple;
if (tuple == null && ColumnIndexesToBeLoaded != null)
{
return(true);
}
if (ColumnIndexesToBeLoaded != null)
{
ColumnIndexesToBeLoaded = null;
}
var needToFetchSystemColumns = false;
foreach (var pair in columns)
{
if (tuple == null || !tuple.GetFieldState(pair.Key).IsAvailable())
{
if (pair.Value.IsPrimaryKey || pair.Value.IsSystem)
{
needToFetchSystemColumns = ExactType && tuple == null;
}
else
{
if (ColumnIndexesToBeLoaded == null)
{
ColumnIndexesToBeLoaded = CreateColumnIndexCollection();
}
ColumnIndexesToBeLoaded.Add(pair.Key);
}
}
}
if (needToFetchSystemColumns && ColumnIndexesToBeLoaded == null)
{
ColumnIndexesToBeLoaded = CreateColumnIndexCollection();
}
return(ColumnIndexesToBeLoaded != null);
}
public static bool?TryGetExactKeyType(Key key, PrefetchManager manager, out TypeInfo type)
{
type = null;
if (!key.TypeReference.Type.IsLeaf)
{
var cachedKey = key;
EntityState state;
if (!manager.TryGetTupleOfNonRemovedEntity(ref cachedKey, out state))
{
return(null);
}
if (cachedKey.HasExactType)
{
type = cachedKey.TypeReference.Type;
return(true);
}
return(false);
}
type = key.TypeReference.Type;
return(true);
}