private void HandleElements(FromReferenceNode collectionNode, String propertyName)
{
FromElement collectionFromElement = collectionNode.FromElement;
IQueryableCollection queryableCollection = collectionFromElement.QueryableCollection;
String path = collectionNode.Path + "[]." + propertyName;
Log.Debug("Creating elements for {0}", path);
_fromElement = collectionFromElement;
if (!collectionFromElement.IsCollectionOfValuesOrComponents)
{
Walker.AddQuerySpaces(queryableCollection.ElementPersister);
}
DataType = queryableCollection.ElementType;
_selectColumns = collectionFromElement.ToColumns(_fromElement.TableAlias, propertyName, _inSelect);
}
public override void ResolveIndex(IASTNode parent)
{
// An ident node can represent an index expression if the ident
// represents a naked property ref
// *Note: this makes the assumption (which is currently the case
// in the hql-sql grammar) that the ident is first resolved
// itself (addrExpr -> resolve()). The other option, if that
// changes, is to call resolve from here; but it is
// currently un-needed overhead.
if (!(IsResolved && _nakedPropertyRef))
{
throw new InvalidOperationException();
}
string propertyName = OriginalText;
if (!DataType.IsCollectionType)
{
throw new SemanticException("Collection expected; [" + propertyName + "] does not refer to a collection property");
}
// TODO : most of below was taken verbatim from DotNode; should either delegate this logic or super-type it
CollectionType type = (CollectionType)DataType;
string role = type.Role;
IQueryableCollection queryableCollection = SessionFactoryHelper.RequireQueryableCollection(role);
string columnTableAlias = FromElement.TableAlias;
FromElementFactory factory = new FromElementFactory(
Walker.CurrentFromClause,
FromElement,
propertyName,
null,
FromElement.ToColumns(columnTableAlias, propertyName, false),
true
);
FromElement elem = factory.CreateCollection(queryableCollection, role, JoinType.InnerJoin, false, true);
FromElement = elem;
Walker.AddQuerySpaces(queryableCollection.CollectionSpaces); // Always add the collection's query spaces.
}
private void DereferenceEntityJoin(string classAlias, EntityType propertyType, bool impliedJoin, IASTNode parent)
{
_dereferenceType = DerefEntity;
if (Log.IsDebugEnabled)
{
Log.Debug("dereferenceEntityJoin() : generating join for " + _propertyName + " in "
+ FromElement.ClassName + " "
+ ((classAlias == null) ? "{no alias}" : "(" + classAlias + ")")
+ " parent = " + ASTUtil.GetDebugstring(parent)
);
}
// Create a new FROM node for the referenced class.
string associatedEntityName = propertyType.GetAssociatedEntityName();
string tableAlias = AliasGenerator.CreateName(associatedEntityName);
string[] joinColumns = GetColumns();
string joinPath = Path;
if (impliedJoin && Walker.IsInFrom)
{
_joinType = Walker.ImpliedJoinType;
}
FromClause currentFromClause = Walker.CurrentFromClause;
FromElement elem = currentFromClause.FindJoinByPath(joinPath);
///////////////////////////////////////////////////////////////////////////////
//
// This is the piece which recognizes the condition where an implicit join path
// resolved earlier in a correlated subquery is now being referenced in the
// outer query. For 3.0final, we just let this generate a second join (which
// is exactly how the old parser handles this). Eventually we need to add this
// logic back in and complete the logic in FromClause.promoteJoin; however,
// FromClause.promoteJoin has its own difficulties (see the comments in
// FromClause.promoteJoin).
//
// if ( elem == null ) {
// // see if this joinPath has been used in a "child" FromClause, and if so
// // promote that element to the outer query
// FromClause currentNodeOwner = getFromElement().getFromClause();
// FromClause currentJoinOwner = currentNodeOwner.locateChildFromClauseWithJoinByPath( joinPath );
// if ( currentJoinOwner != null && currentNodeOwner != currentJoinOwner ) {
// elem = currentJoinOwner.findJoinByPathLocal( joinPath );
// if ( elem != null ) {
// currentFromClause.promoteJoin( elem );
// // EARLY EXIT!!!
// return;
// }
// }
// }
//
///////////////////////////////////////////////////////////////////////////////
bool found = elem != null;
// even though we might find a pre-existing element by join path, for FromElements originating in a from-clause
// we should only ever use the found element if the aliases match (null != null here). Implied joins are
// always (?) ok to reuse.
bool useFoundFromElement = found && (elem.IsImplied || (AreSame(classAlias, elem.ClassAlias)));
if (!useFoundFromElement)
{
// If this is an implied join in a from element, then use the impled join type which is part of the
// tree parser's state (set by the gramamar actions).
JoinSequence joinSequence = SessionFactoryHelper
.CreateJoinSequence(impliedJoin, propertyType, tableAlias, _joinType, joinColumns);
FromElementFactory factory = new FromElementFactory(
currentFromClause,
GetLhs().FromElement,
joinPath,
classAlias,
joinColumns,
impliedJoin
);
elem = factory.CreateEntityJoin(
associatedEntityName,
tableAlias,
joinSequence,
_fetch,
Walker.IsInFrom,
propertyType
);
}
else
{
currentFromClause.AddDuplicateAlias(classAlias, elem);
}
SetImpliedJoin(elem);
Walker.AddQuerySpaces(elem.EntityPersister.QuerySpaces);
FromElement = elem; // This 'dot' expression now refers to the resulting from element.
}
private void DereferenceCollection(CollectionType collectionType, bool implicitJoin, bool indexed, string classAlias)
{
_dereferenceType = DerefCollection;
string role = collectionType.Role;
//foo.bars.size (also handles deprecated stuff like foo.bars.maxelement for backwardness)
IASTNode sibling = NextSibling;
bool isSizeProperty = sibling != null && CollectionProperties.IsAnyCollectionProperty(sibling.Text);
if (isSizeProperty)
{
indexed = true; //yuck!}
}
IQueryableCollection queryableCollection = SessionFactoryHelper.RequireQueryableCollection(role);
string propName = Path;
FromClause currentFromClause = Walker.CurrentFromClause;
if (Walker.StatementType != HqlSqlWalker.SELECT && indexed && classAlias == null)
{
// should indicate that we are processing an INSERT/UPDATE/DELETE
// query with a subquery implied via a collection property
// function. Here, we need to use the table name itself as the
// qualification alias.
// TODO : verify this works for all databases...
// TODO : is this also the case in non-"indexed" scenarios?
string alias = GetLhs().FromElement.Queryable.TableName;
_columns = FromElement.ToColumns(alias, _propertyPath, false, true);
}
//We do not look for an existing join on the same path, because
//it makes sense to join twice on the same collection role
FromElementFactory factory = new FromElementFactory(
currentFromClause,
GetLhs().FromElement,
propName,
classAlias,
GetColumns(),
implicitJoin
);
FromElement elem = factory.CreateCollection(queryableCollection, role, _joinType, _fetch, indexed);
if (Log.IsDebugEnabled)
{
Log.Debug("dereferenceCollection() : Created new FROM element for " + propName + " : " + elem);
}
SetImpliedJoin(elem);
FromElement = elem; // This 'dot' expression now refers to the resulting from element.
if (isSizeProperty)
{
elem.Text = "";
elem.UseWhereFragment = false;
}
if (!implicitJoin)
{
IEntityPersister entityPersister = elem.EntityPersister;
if (entityPersister != null)
{
Walker.AddQuerySpaces(entityPersister.QuerySpaces);
}
}
Walker.AddQuerySpaces(queryableCollection.CollectionSpaces); // Always add the collection's query spaces.
}