internal CurrentValueRecord(ObjectStateEntry cacheEntry, StateManagerTypeMetadata metadata, object userObject)
:
base(cacheEntry, metadata, userObject)
{
}
/// <summary>
/// Attempts to null all FKs associated with the dependent end of this relationship on this entity.
/// This may result in setting conceptual nulls if the FK is not nullable.
/// </summary>
internal void NullAllForeignKeys()
{
Debug.Assert(ObjectContext != null, "Nulling FKs only works when attached.");
Debug.Assert(IsForeignKey, "Cannot null FKs for independent associations.");
ObjectStateManager stateManager = ObjectContext.ObjectStateManager;
EntityEntry entry = WrappedOwner.ObjectStateEntry;
TransactionManager transManager = stateManager.TransactionManager;
if (!transManager.IsGraphUpdate && !transManager.IsAttachTracking && !transManager.IsRelatedEndAdd)
{
ReferentialConstraint constraint = ((AssociationType)RelationMetadata).ReferentialConstraints.Single();
if (TargetRoleName == constraint.FromRole.Name) // Only do this on the dependent end
{
if (transManager.IsDetaching)
{
// If the principal is being detached, then the dependent must be added back to the
// dangling keys index.
// Perf note: The dependent currently gets added when it is being detached and is then
// removed again later in the process. The code could be optimized to prevent this.
Debug.Assert(entry != null, "State entry must exist while detaching.");
EntityKey foreignKey = ForeignKeyFactory.CreateKeyFromForeignKeyValues(entry, this);
if (foreignKey != null)
{
stateManager.AddEntryContainingForeignKeyToIndex(foreignKey, entry);
}
}
else if (!ReferenceEquals(stateManager.EntityInvokingFKSetter, WrappedOwner.Entity) && !transManager.IsForeignKeyUpdate)
{
transManager.BeginForeignKeyUpdate(this);
try
{
bool unableToNull = true;
bool canSetModifiedProps = entry != null && (entry.State == EntityState.Modified || entry.State == EntityState.Unchanged);
EntitySet dependentEntitySet = ((AssociationSet)RelationshipSet).AssociationSetEnds[FromEndProperty.Name].EntitySet;
StateManagerTypeMetadata dependentTypeMetadata = stateManager.GetOrAddStateManagerTypeMetadata(WrappedOwner.IdentityType, dependentEntitySet);
for (int i = 0; i < constraint.FromProperties.Count; i++)
{
string propertyName = constraint.ToProperties[i].Name;
int dependentOrdinal = dependentTypeMetadata.GetOrdinalforOLayerMemberName(propertyName);
StateManagerMemberMetadata member = dependentTypeMetadata.Member(dependentOrdinal);
// This is a check for nullability in o-space. However, o-space nullability is not the
// same as nullability of the underlying type. In particular, one difference is that when
// attribute-based mapping is used then a property can be marked as not nullable in o-space
// even when the underlying CLR type is nullable. For such a case, we treat the property
// as if it were not nullable (since that's what we have shipped) even though we could
// technically set it to null.
if (member.ClrMetadata.Nullable)
{
// Only set the value to null if it is not already null.
if (member.GetValue(WrappedOwner.Entity) != null)
{
WrappedOwner.SetCurrentValue(
WrappedOwner.ObjectStateEntry,
dependentTypeMetadata.Member(dependentOrdinal),
-1,
WrappedOwner.Entity,
null);
}
else
{
// Given that the current value is null, this next check confirms that the original
// value is also null. If it isn't, then we must make sure that the entity is marked
// as modified.
// This case can happen because fixup in the entity can set the FK to null while processing
// a RelatedEnd operation. This will be detected by DetectChanges, but when performing
// RelatedEnd operations the user is not required to call DetectChanges.
if (canSetModifiedProps && WrappedOwner.ObjectStateEntry.OriginalValues.GetValue(dependentOrdinal) != null)
{
entry.SetModifiedProperty(propertyName);
}
}
unableToNull = false;
}
else if (canSetModifiedProps)
{
entry.SetModifiedProperty(propertyName);
}
}
if (unableToNull)
{
// We were unable to null out the FK because all FK properties were non-nullable.
// We need to keep track of this state so that we treat the FK as null even though
// we were not able to null it. This prevents the FK from being used for fixup and
// also causes an exception to be thrown if an attempt is made to commit in this state.
//We should only set a conceptual null if the entity is tracked
if (entry != null)
{
//The CachedForeignKey may be null if we are putting
//back a Conceptual Null as part of roll back
EntityKey realKey = CachedForeignKey;
if (realKey == null)
{
realKey = ForeignKeyFactory.CreateKeyFromForeignKeyValues(entry, this);
}
// Note that the realKey can still be null here for a situation where the key is marked not nullable
// in o-space and yet the underlying type is nullable and the entity has been added or attached with a null
// value for the property. This will cause SaveChanges to throw unless the entity is marked
// as deleted before SaveChanges is called, in which case we don't want to set a conceptual
// null here as the call might very well succeed in the database since, unless the FK is
// a concurrency token, the value we have for it is not used at all for the delete.
if (realKey != null)
{
SetCachedForeignKey(ForeignKeyFactory.CreateConceptualNullKey(realKey), entry);
stateManager.RememberEntryWithConceptualNull(entry);
}
}
}
else
{
SetCachedForeignKey(null, entry);
}
}
finally
{
transManager.EndForeignKeyUpdate();
}
}
}
}
}
internal CurrentValueRecord(ObjectStateEntry cacheEntry, StateManagerTypeMetadata metadata, object userObject)
:
base(cacheEntry, metadata, userObject)
{
}
/// <summary>
/// Takes key values from the given principal entity and transfers them to the foreign key properties
/// of the dependant entry. This method requires a context, but does not require that either
/// entity is in the context. This allows it to work in NoTracking cases where we have the context
/// but we're not tracked by that context.
/// </summary>
/// <param name="dependentEntity">The entity into which foreign key values will be written</param>
/// <param name="principalEntity">The entity from which key values will be obtained</param>
/// <param name="changedFKs">If non-null, then keeps track of FKs that have already been set such that an exception can be thrown if we find conflicting values</param>
/// <param name="forceChange">If true, then the property setter is called even if FK values already match,
/// which causes the FK properties to be marked as modified.</param>
internal void UpdateForeignKeyValues(IEntityWrapper dependentEntity, IEntityWrapper principalEntity, Dictionary <int, object> changedFKs, bool forceChange)
{
Debug.Assert(dependentEntity.Entity != null, "dependentEntity.Entity == null");
Debug.Assert(principalEntity.Entity != null, "principalEntity.Entity == null");
Debug.Assert(this.IsForeignKey, "cannot update foreign key values if the relationship is not a FK");
ReferentialConstraint constraint = ((AssociationType)this.RelationMetadata).ReferentialConstraints[0];
Debug.Assert(constraint != null, "null constraint");
bool isUnchangedDependent = (object)WrappedOwner.EntityKey != null &&
!WrappedOwner.EntityKey.IsTemporary &&
IsDependentEndOfReferentialConstraint(checkIdentifying: true);
ObjectStateManager stateManager = ObjectContext.ObjectStateManager;
stateManager.TransactionManager.BeginForeignKeyUpdate(this);
try
{
EntitySet principalEntitySet = ((AssociationSet)RelationshipSet).AssociationSetEnds[ToEndMember.Name].EntitySet;
StateManagerTypeMetadata principalTypeMetadata = stateManager.GetOrAddStateManagerTypeMetadata(principalEntity.IdentityType, principalEntitySet);
EntitySet dependentEntitySet = ((AssociationSet)RelationshipSet).AssociationSetEnds[FromEndProperty.Name].EntitySet;
StateManagerTypeMetadata dependentTypeMetadata = stateManager.GetOrAddStateManagerTypeMetadata(dependentEntity.IdentityType, dependentEntitySet);
var principalProps = constraint.FromProperties;
int numValues = principalProps.Count;
string[] keyNames = null;
object[] values = null;
if (numValues > 1)
{
keyNames = principalEntitySet.ElementType.KeyMemberNames;
values = new object[numValues];
}
for (int i = 0; i < numValues; i++)
{
int principalOrdinal = principalTypeMetadata.GetOrdinalforOLayerMemberName(principalProps[i].Name);
object value = principalTypeMetadata.Member(principalOrdinal).GetValue(principalEntity.Entity);
int dependentOrdinal = dependentTypeMetadata.GetOrdinalforOLayerMemberName(constraint.ToProperties[i].Name);
bool valueChanging = !ByValueEqualityComparer.Default.Equals(dependentTypeMetadata.Member(dependentOrdinal).GetValue(dependentEntity.Entity), value);
if (forceChange || valueChanging)
{
if (isUnchangedDependent)
{
ValidateSettingRIConstraints(principalEntity, settingToNull: value == null, changingForeignKeyValue: valueChanging);
}
// If we're tracking FK values that have already been set, then compare the value we are about to set
// to the value we previously set for this ordinal, if such a value exists. If they don't match then
// it means that we got conflicting FK values from two different PKs and we should throw.
if (changedFKs != null)
{
object previouslySetValue;
if (changedFKs.TryGetValue(dependentOrdinal, out previouslySetValue))
{
if (!ByValueEqualityComparer.Default.Equals(previouslySetValue, value))
{
throw new InvalidOperationException(System.Data.Entity.Strings.Update_ReferentialConstraintIntegrityViolation);
}
}
else
{
changedFKs[dependentOrdinal] = value;
}
}
dependentEntity.SetCurrentValue(
dependentEntity.ObjectStateEntry,
dependentTypeMetadata.Member(dependentOrdinal),
-1,
dependentEntity.Entity,
value);
}
if (numValues > 1)
{
int keyIndex = Array.IndexOf(keyNames, principalProps[i].Name);
Debug.Assert(keyIndex >= 0 && keyIndex < numValues, "Could not find constraint prop name in entity set key names");
values[keyIndex] = value;
}
else
{
SetCachedForeignKey(new EntityKey(principalEntitySet, value), dependentEntity.ObjectStateEntry);
}
}
if (numValues > 1)
{
SetCachedForeignKey(new EntityKey(principalEntitySet, values), dependentEntity.ObjectStateEntry);
}
if (WrappedOwner.ObjectStateEntry != null)
{
stateManager.ForgetEntryWithConceptualNull(WrappedOwner.ObjectStateEntry, resetAllKeys: false);
}
}
finally
{
stateManager.TransactionManager.EndForeignKeyUpdate();
}
}
