Examples of org.eclipse.persistence.expressions.ExpressionBuilder

Package org.eclipse.persistence.expressions

Examples of org.eclipse.persistence.expressions.ExpressionBuilder

org.eclipse.persistence.expressions.ExpressionBuilder

Purpose: Allow for instances of expression to be created. Expressions are Java object-level representations of SQL "where" clauses. The expressions attempt to mirror Java code as closely as possible.

Example:

 ExpressionBuilder employee = new ExpressionBuilder(); employee.get("firstName").equal("Bob").and(employee.get("lastName").equal("Smith")) >> equivalent Java code: (employee.getFirstName().equals("Bob")) && (employee.getLastName().equals("Smith")) >> equivalent SQL: (F_NAME = 'Bob') AND (L_NAME = 'Smith')

@see Expression

        if (this.getSourceToTargetKeyFields().isEmpty()) {
            throw DescriptorException.noForeignKeysAreSpecified(this);
        }


        Expression criteria;
        Expression builder = new ExpressionBuilder();
        Iterator keyIterator = getSourceToTargetKeyFields().keySet().iterator();
        while (keyIterator.hasNext()) {
            DatabaseField foreignKey = (DatabaseField)keyIterator.next();
            DatabaseField targetKey = (DatabaseField)getSourceToTargetKeyFields().get(foreignKey);


            Expression expression = builder.getField(targetKey).equal(builder.getParameter(foreignKey));
            criteria = expression.and(getSelectionCriteria());
            setSelectionCriteria(criteria);
        }
    }

View Full Code Here

    protected void initializePrivateOwnedCriteria() {
        if (!isForeignKeyRelationship()) {
            setPrivateOwnedCriteria(getSelectionCriteria());
        } else {
            Expression pkCriteria = getDescriptor().getObjectBuilder().getPrimaryKeyExpression();
            ExpressionBuilder builder = new ExpressionBuilder();
            Expression backRef = builder.getManualQueryKey(getAttributeName() + "-back-ref", getDescriptor());
            Expression newPKCriteria = pkCriteria.rebuildOn(backRef);
            Expression twistedSelection = backRef.twist(getSelectionCriteria(), builder);
            if (getDescriptor().getQueryManager().getAdditionalJoinExpression() != null) {
                // We don't have to twist the additional join because it's all against the same node, which is our base
                // but we do have to rebuild it onto the manual query key

View Full Code Here

        if (m_query == null) {
            m_query = new ReadObjectQuery(m_parentClass);
            
            Expression selectionCriteria = null;
            Iterator keys = m_queryKeyFields.keySet().iterator();
            ExpressionBuilder builder = new ExpressionBuilder();
            
            while (keys.hasNext()) {
                String keyField = ((DatabaseField) keys.next()).getQualifiedName();
                
                if (selectionCriteria == null) {
                    selectionCriteria = builder.getField(keyField).equal(builder.getParameter(keyField));
                } else {
                    selectionCriteria.and(builder.getField(keyField).equal(builder.getParameter(keyField)));
                }
                
                m_query.addArgument(keyField);
            }

View Full Code Here

     public void initUnmappedFieldsQuery(UnitOfWorkImpl uow) {
         if(m_unmappedFieldsQuery == null) {
             m_unmappedFieldsQuery = new DataReadQuery();


             Expression whereClause = null;
             Expression builder = new ExpressionBuilder();
             Iterator<DatabaseField> itPrimaryKey = m_descriptor.getPrimaryKeyFields().iterator();
             while (itPrimaryKey.hasNext()) {
                 DatabaseField primaryKey = itPrimaryKey.next();
                 Expression expression = builder.getField(primaryKey).equal(builder.getParameter(primaryKey));
                 whereClause = expression.and(whereClause);
                 m_unmappedFieldsQuery.addArgument(primaryKey.getQualifiedName());
             }


             SQLSelectStatement statement = new SQLSelectStatement();

View Full Code Here

            return;
        }


        // Build where clause expression.
        Expression whereClause = null;
        Expression builder = new ExpressionBuilder();


        List<DatabaseField> targetPrimaryKeyFields = getReferenceDescriptor().getPrimaryKeyFields();
        int size = targetPrimaryKeyFields.size();
        for (int index = 0; index < size; index++) {
            DatabaseField targetPrimaryKey = targetPrimaryKeyFields.get(index);
            Expression expression = builder.getField(targetPrimaryKey).equal(builder.getParameter(targetPrimaryKey));
            whereClause = expression.and(whereClause);
        }


        AbstractRecord modifyRow = new DatabaseRecord();
        size = targetForeignKeyFields.size();
        for (int index = 0; index < size; index++) {
            DatabaseField targetForeignKey = targetForeignKeyFields.get(index);
            modifyRow.put(targetForeignKey, null);
            Expression expression = builder.getField(targetForeignKey).equal(builder.getParameter(targetForeignKey));
            whereClause = expression.and(whereClause);
        }


        SQLUpdateStatement statement = new SQLUpdateStatement();
        statement.setTable(getReferenceDescriptor().getDefaultTable());

View Full Code Here

            return;
        }


        // Build where clause expression.
        Expression whereClause = null;
        Expression builder = new ExpressionBuilder();


        AbstractRecord modifyRow = new DatabaseRecord();
        int size = targetForeignKeyFields.size();
        for (int index = 0; index < size; index++) {
            DatabaseField targetForeignKey = targetForeignKeyFields.get(index);
            modifyRow.put(targetForeignKey, null);
            Expression expression = builder.getField(targetForeignKey).equal(builder.getParameter(targetForeignKey));
            whereClause = expression.and(whereClause);
        }


        SQLUpdateStatement statement = new SQLUpdateStatement();
        statement.setTable(getReferenceDescriptor().getDefaultTable());

View Full Code Here


        if (hasCustomDeleteQuery()) {
            return;
        }


        Expression builder = new ExpressionBuilder();
        Expression directKeyExp = builder.getField(getDirectKeyField()).equal(builder.getParameter(getDirectKeyField()));
        Expression expression = null;
        SQLDeleteStatement statement = new SQLDeleteStatement();


        // Construct an expression to delete from the relation table.
        for (int index = 0; index < getReferenceKeyFields().size(); index++) {
            DatabaseField referenceKey = getReferenceKeyFields().get(index);
            DatabaseField sourceKey = getSourceKeyFields().get(index);


            Expression subExp1 = builder.getField(referenceKey);
            Expression subExp2 = builder.getParameter(sourceKey);
            Expression subExpression = subExp1.equal(subExp2);


            expression = subExpression.and(expression);
        }
        expression = expression.and(directKeyExp);

View Full Code Here

            return;
        }


        // Build where clause expression.
        Expression whereClause = null;
        Expression builder = new ExpressionBuilder();


        List<DatabaseField> targetPrimaryKeyFields = getReferenceDescriptor().getPrimaryKeyFields();
        int size = targetPrimaryKeyFields.size();
        for (int index = 0; index < size; index++) {
            DatabaseField targetPrimaryKey = targetPrimaryKeyFields.get(index);
            Expression expression = builder.getField(targetPrimaryKey).equal(builder.getParameter(targetPrimaryKey));
            whereClause = expression.and(whereClause);
        }


        AbstractRecord modifyRow = new DatabaseRecord();
        size = targetForeignKeyFields.size();

View Full Code Here

            public void postBuild(DescriptorEvent event) {
                FunctionExpression expression = (FunctionExpression)event.getObject();
                for (int index = 0; index < expression.getChildren().size(); index++) {
                    Expression child = (Expression)expression.getChildren().get(index);
                    if (child.isValueExpression()) {
                        child.setLocalBase(new ExpressionBuilder());
                    }
                }
                if (expression.getChildren().size() > 0) {
                    expression.setBaseExpression((Expression)expression.getChildren().get(0));
                }
                else {
                    expression.setBaseExpression(new ExpressionBuilder());
                }
            }
        });


        XMLDirectMapping operatorMapping = new XMLDirectMapping();

View Full Code Here

     * fields or expressions corresponding to the passed join expression.
     */
    protected void addSelectionFieldsForJoinedExpression(List fields, boolean isCustomSQL, Expression expression) {
        if(isCustomSQL) {
            // Expression may not have been initialized.
            ExpressionBuilder builder = expression.getBuilder();
            builder.setSession(getSession().getRootSession(null));
            builder.setQueryClass(getReferenceClass());
        }
        ForeignReferenceMapping mapping = (ForeignReferenceMapping)((QueryKeyExpression)expression).getMapping();
        ClassDescriptor referenceDescriptor = mapping.getReferenceDescriptor();


        // Add the fields defined by the nested fetch group - if it exists.

View Full Code Here

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Related Classes of org.eclipse.persistence.expressions.ExpressionBuilder

org.eclipse.persistence.descriptors.DescriptorQueryManager

org.eclipse.persistence.descriptors.SingleTableMultitenantPolicy

org.eclipse.persistence.eis.mappings.EISOneToManyMapping

org.eclipse.persistence.eis.mappings.EISOneToOneMapping

org.eclipse.persistence.internal.descriptors.CascadeLockingPolicy

org.eclipse.persistence.internal.jpa.jpql.AbstractModifyAllQueryBuilder

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

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

org.eclipse.persistence.internal.jpa.jpql.DerivedDeclaration

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

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