Examples of org.eclipse.persistence.queries.ReportQuery

org.eclipse.persistence.queries.ReportQuery
Purpose: Query for information about a set of objects instead of the objects themselves. This supports select single attributes, nested attributes, aggregation functions and group bys.
Attribute Types:
1. addAttribute("directQueryKey") is a short cut method to add an attribute with the same name as its corresponding direct query key.
2. addAttribute("attributeName", expBuilder.get("oneToOneMapping").get("directQueryKey")) is the full approach for get values through joined 1:1 relationships.
3. addAttribute("attributeName", expBuilder.getField("TABLE.FIELD")) allows the addition of raw values or values which were not mapped in the object model directly (i.e. FK attributes).
4. addAttribute("attributeName", null) Leave a place holder (NULL) value in the result (used for included values from other systems or calculated values).
Retrieving Primary Keys: It is possible to retrieve the primary key raw values within each result, but stored in a separate (internal) vector. This primary key vector can later be used to retrieve the real object. @see #retrievePrimaryKeys() @see #readObject(Class,Session) If the values are wanted in the result array then they must be added as attributes. For primary keys which are not mapped directly you can add them as DatabaseFields (see above). @author Doug Clarke @since TOPLink/Java 2.0

     * INTERNAL
     * Apply this node to the passed query
     */
    public void applyToQuery(ObjectLevelReadQuery theQuery, GenerationContext context) {
        if (theQuery.isReportQuery()) {
            ReportQuery reportQuery = (ReportQuery)theQuery;
            reportQuery.addAttribute("plus", generateExpression(context), (Class)getType());
        }
    }

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     * INTERNAL
     * Apply this node to the passed query
     */
    public void applyToQuery(ObjectLevelReadQuery theQuery, GenerationContext generationContext) {
        if (theQuery instanceof ReportQuery) {
            ReportQuery reportQuery = (ReportQuery)theQuery;
            Expression expression = generateExpression(generationContext);
            reportQuery.addAttribute(left.resolveAttribute() + "Index", expression, Integer.class);
        }
    }

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     * INTERNAL
     * Apply this node to the passed query
     */
    public void applyToQuery(ObjectLevelReadQuery theQuery, GenerationContext generationContext) {
        if (theQuery instanceof ReportQuery) {
            ReportQuery reportQuery = (ReportQuery)theQuery;
            Expression expression = generateExpression(generationContext);
            reportQuery.addItem("Coalesce", expression);
        }
    }

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     * INTERNAL
     * Generate the EclipseLink expression for this node
     */
    public Expression generateExpression(GenerationContext context) {
        SubqueryNode subqueryNode = (SubqueryNode)getLeft();
        ReportQuery reportQuery = subqueryNode.getReportQuery(context);


        Expression expr = context.getBaseExpression();
        return expr.all(reportQuery);
    }

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     * INTERNAL
     * Apply this node to the passed query
     */
    public void applyToQuery(ObjectLevelReadQuery theQuery, GenerationContext context) {
        if (theQuery.isReportQuery()) {
            ReportQuery reportQuery = (ReportQuery)theQuery;
            reportQuery.addAttribute("CONSTANT", generateExpression(context));
        }
        
    }

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     * INTERNAL
     * Apply this node to the passed query
     */
    public void applyToQuery(ObjectLevelReadQuery theQuery, GenerationContext context) {
        if (theQuery.isReportQuery()) {
            ReportQuery reportQuery = (ReportQuery)theQuery;
            reportQuery.addAttribute("divide", generateExpression(context), (Class)getType());
        }
    }

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     * INTERNAL
     * Apply this node to the passed query
     */
    public void applyToQuery(ObjectLevelReadQuery theQuery, GenerationContext generationContext) {
        if (theQuery instanceof ReportQuery) {
            ReportQuery reportQuery = (ReportQuery)theQuery;
            Expression expression = generateExpression(generationContext);
            reportQuery.addItem(left.resolveAttribute() + "MapKey", expression);
        }
    }

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        if (type == null) {
            throw new IllegalArgumentException("DynamicHelper.createQuery: Dynamic type not found: " + typeName);
        }


        return new ReportQuery(type.getJavaClass(), builder);
    }

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     * INTERNAL
     * Apply this node to the passed query
     */
    public void applyToQuery(ObjectLevelReadQuery theQuery, GenerationContext generationContext) {
        if (theQuery instanceof ReportQuery) {
            ReportQuery reportQuery = (ReportQuery)theQuery;
            Expression expression = generateExpression(generationContext);
            reportQuery.addAttribute("Case", expression, (Class)getType());
        }
    }

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     * INTERNAL
     * Apply this node to the passed query
     */
    public void applyToQuery(ObjectLevelReadQuery theQuery, GenerationContext context) {
        if (theQuery.isReportQuery()){
            ReportQuery reportQuery = (ReportQuery)theQuery;
            reportQuery.addAttribute(resolveAttribute(), generateExpression(context));
            reportQuery.dontRetrievePrimaryKeys();
        }
    }

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Related Classes of org.eclipse.persistence.queries.ReportQuery

org.eclipse.persistence.descriptors.ClassDescriptor

org.eclipse.persistence.descriptors.DescriptorQueryManager

org.eclipse.persistence.dynamic.DynamicHelper

org.eclipse.persistence.internal.descriptors.OptimisticLockingPolicy

org.eclipse.persistence.internal.expressions.FromAliasExpression

org.eclipse.persistence.internal.expressions.FunctionExpression

org.eclipse.persistence.internal.jpa.jpql.AbstractObjectLevelReadQueryVisitor

org.eclipse.persistence.internal.jpa.jpql.AbstractReadAllQueryVisitor

org.eclipse.persistence.internal.jpa.jpql.ExpressionBuilderVisitor

org.eclipse.persistence.internal.jpa.jpql.ExpressionBuilderVisitor$InExpressionBuilder

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