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

            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();

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  void visitAbstractFromClause(AbstractFromClause expression) {


    // Set the ExpressionBuilder
    Expression baseExpression = queryContext.getBaseExpression();
    ExpressionBuilder expressionBuilder = baseExpression.getBuilder();
    query.setExpressionBuilder(expressionBuilder);


    // Set the reference class if it's not set
    if (query.getReferenceClass() == null) {
      query.setReferenceClass(expressionBuilder.getQueryClass());
      query.changeDescriptor(queryContext.getSession());
    }


    // Add join expressions to the query (but not the join fetch expressions)
    JoinVisitor visitor = new JoinVisitor();

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     * 
     * @param subquery
     * @return all expression
     */
    public <Y> Expression<Y> all(Subquery<Y> subquery){
        return new FunctionExpressionImpl<Y>(metamodel, (Class<Y>) subquery.getJavaType(), new ExpressionBuilder().all(((InternalSelection)subquery).getCurrentNode()), buildList(subquery), "all");
    }

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     * 
     * @param subquery
     * @return all expression
     */
    public <Y> Expression<Y> some(Subquery<Y> subquery){
        return new FunctionExpressionImpl<Y>(metamodel, (Class<Y>) subquery.getJavaType(), new ExpressionBuilder().some(((InternalSelection)subquery).getCurrentNode()), buildList(subquery), "some");
    }

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     * 
     * @param subquery
     * @return any expression
     */
    public <Y> Expression<Y> any(Subquery<Y> subquery){
        return new FunctionExpressionImpl<Y>(metamodel, (Class<Y>) subquery.getJavaType(), new ExpressionBuilder().any(((InternalSelection)subquery).getCurrentNode()), buildList(subquery), "any");
   }

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     * 
     * @param value
     * @return expression literal
     */
    public <T> Expression<T> literal(T value){
        return new ExpressionImpl<T>(metamodel, (Class<T>) (value == null? null: value.getClass()), new ConstantExpression(value, new ExpressionBuilder()), value);
    }

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     *
     * @param resultClass  type of the null literal
     * @return null expression literal
     */
    public <T> Expression<T> nullLiteral(Class<T> resultClass){
        return new ExpressionImpl<T>(metamodel, resultClass, new ConstantExpression(null, new ExpressionBuilder()), null);
    }

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     * Create expression to return current date.
     * 
     * @return expression for current date
     */
    public Expression<java.sql.Date> currentDate(){
        return new ExpressionImpl(metamodel, ClassConstants.SQLDATE, new ExpressionBuilder().currentDateDate());
    }

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     * Create expression to return current timestamp.
     * 
     * @return expression for current timestamp
     */
    public Expression<java.sql.Timestamp> currentTimestamp(){
        return new ExpressionImpl(metamodel, ClassConstants.TIMESTAMP, new ExpressionBuilder().currentTimeStamp());
    }

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     * Create expression to return current time.
     * 
     * @return expression for current time
     */
    public Expression<java.sql.Time> currentTime(){
        return new ExpressionImpl(metamodel, ClassConstants.TIME, new ExpressionBuilder().currentTime());
    }

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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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