public FromElement createEntityJoin( String entityClass, String tableAlias, JoinSequence joinSequence, boolean fetchFlag, boolean inFrom, EntityType type, String role, String joinPath) throws SemanticException { FromElement elem = createJoin(entityClass, tableAlias, joinSequence, type, false); elem.setFetch(fetchFlag); if (joinPath != null) { elem.applyTreatAsDeclarations(fromClause.getWalker().getTreatAsDeclarationsByPath(joinPath)); } EntityPersister entityPersister = elem.getEntityPersister(); int numberOfTables = entityPersister.getQuerySpaces().length; if (numberOfTables > 1 && implied && !elem.useFromFragment()) { LOG.debug("createEntityJoin() : Implied multi-table entity join"); elem.setUseFromFragment(true); } // If this is an implied join in a FROM clause, then use ANSI-style joining, and set the // flag on the FromElement that indicates that it was implied in the FROM clause itself. if (implied && inFrom) { joinSequence.setUseThetaStyle(false); elem.setUseFromFragment(true); elem.setImpliedInFromClause(true); } if (elem.getWalker().isSubQuery()) { // two conditions where we need to transform this to a theta-join syntax: // 1) 'elem' is the "root from-element" in correlated subqueries // 2) The DotNode.useThetaStyleImplicitJoins has been set to true // and 'elem' represents an implicit join if (elem.getFromClause() != elem.getOrigin().getFromClause() || // ( implied && DotNode.useThetaStyleImplicitJoins ) ) { PathSeparatorNode.useThetaStyleImplicitJoins) { // the "root from-element" in correlated subqueries do need this piece elem.setType(FROM_FRAGMENT); joinSequence.setUseThetaStyle(true); elem.setUseFromFragment(false); } } elem.setRole(role); return elem; }
/** * Prepares an explicitly defined select clause. * * @param fromClause The from clause linked to this select clause. * @throws SemanticException indicates a semntic issue with the explicit select clause. */ public void initializeExplicitSelectClause(FromClause fromClause) throws SemanticException { if (prepared) { throw new IllegalStateException("SelectClause was already prepared!"); } // explicit = true; // This is an explict Select. // ArrayList sqlResultTypeList = new ArrayList(); ArrayList queryReturnTypeList = new ArrayList(); // First, collect all of the select expressions. // NOTE: This must be done *before* invoking setScalarColumnText() because setScalarColumnText() // changes the AST!!! SelectExpression[] selectExpressions = collectSelectExpressions(); // we only support parameters in select in the case of INSERT...SELECT statements if (getParameterPositions().size() > 0 && getWalker().getStatementType() != HqlSqlTokenTypes.INSERT) { throw new QueryException( "Parameters are only supported in SELECT clauses when used as part of a INSERT INTO DML statement"); } for (int i = 0; i < selectExpressions.length; i++) { SelectExpression selectExpression = selectExpressions[i]; if (AggregatedSelectExpression.class.isInstance(selectExpression)) { aggregatedSelectExpression = (AggregatedSelectExpression) selectExpression; queryReturnTypeList.addAll(aggregatedSelectExpression.getAggregatedSelectionTypeList()); scalarSelect = true; } else { // we have no choice but to do this check here // this is not very elegant but the "right way" would most likely involve a bigger rewrite // so as to // treat ParameterNodes in select clauses as SelectExpressions boolean inSubquery = selectExpression instanceof QueryNode && ((QueryNode) selectExpression).getFromClause().getParentFromClause() != null; if (getWalker().getStatementType() == HqlSqlTokenTypes.INSERT && inSubquery) { // we do not support parameters for subqueries in INSERT...SELECT if (((QueryNode) selectExpression).getSelectClause().getParameterPositions().size() > 0) { throw new QueryException( "Use of parameters in subqueries of INSERT INTO DML statements is not supported."); } } Type type = selectExpression.getDataType(); if (type == null) { throw new IllegalStateException( "No data type for node: " + selectExpression.getClass().getName() + " " + new ASTPrinter(SqlTokenTypes.class).showAsString((AST) selectExpression, "")); } // sqlResultTypeList.add( type ); // If the data type is not an association type, it could not have been in the FROM clause. if (selectExpression.isScalar()) { scalarSelect = true; } if (isReturnableEntity(selectExpression)) { fromElementsForLoad.add(selectExpression.getFromElement()); } // Always add the type to the return type list. queryReturnTypeList.add(type); } } // init the aliases, after initing the constructornode initAliases(selectExpressions); if (!getWalker().isShallowQuery()) { // add the fetched entities List fromElements = fromClause.getProjectionList(); ASTAppender appender = new ASTAppender(getASTFactory(), this); // Get ready to start adding nodes. int size = fromElements.size(); Iterator iterator = fromElements.iterator(); for (int k = 0; iterator.hasNext(); k++) { FromElement fromElement = (FromElement) iterator.next(); if (fromElement.isFetch()) { FromElement origin = null; if (fromElement.getRealOrigin() == null) { // work around that crazy issue where the tree contains // "empty" FromElements (no text); afaict, this is caused // by FromElementFactory.createCollectionJoin() if (fromElement.getOrigin() == null) { throw new QueryException( "Unable to determine origin of join fetch [" + fromElement.getDisplayText() + "]"); } else { origin = fromElement.getOrigin(); } } else { origin = fromElement.getRealOrigin(); } if (!fromElementsForLoad.contains(origin)) { throw new QueryException( "query specified join fetching, but the owner " + "of the fetched association was not present in the select list " + "[" + fromElement.getDisplayText() + "]"); } Type type = fromElement.getSelectType(); addCollectionFromElement(fromElement); if (type != null) { boolean collectionOfElements = fromElement.isCollectionOfValuesOrComponents(); if (!collectionOfElements) { // Add the type to the list of returned sqlResultTypes. fromElement.setIncludeSubclasses(true); fromElementsForLoad.add(fromElement); // sqlResultTypeList.add( type ); // Generate the select expression. String text = fromElement.renderIdentifierSelect(size, k); SelectExpressionImpl generatedExpr = (SelectExpressionImpl) appender.append(SqlTokenTypes.SELECT_EXPR, text, false); if (generatedExpr != null) { generatedExpr.setFromElement(fromElement); } } } } } // generate id select fragment and then property select fragment for // each expression, just like generateSelectFragments(). renderNonScalarSelects(collectSelectExpressions(), fromClause); } if (scalarSelect || getWalker().isShallowQuery()) { // If there are any scalars (non-entities) selected, render the select column aliases. renderScalarSelects(selectExpressions, fromClause); } finishInitialization(/*sqlResultTypeList,*/ queryReturnTypeList); }