Java EE 8 Application Development

Updating data with the Criteria API

When the JPA Criteria API was initially added to JPA 2.0, it only supported selecting data from the database. Modifying existing data was not supported.

JPA 2.1, introduced in Java EE 7, added support for updating database data via the CriteriaUpdate interface; the following example illustrates how to use it:

package net.ensode.javaee8book.criteriaupdate.namedbean; 
 
//imports omitted for brevity 
 
@Named 
@RequestScoped 
public class CriteriaUpdateDemoBean { 
 
    @PersistenceContext 
    private EntityManager entityManager; 
 
    @Resource 
    private UserTransaction userTransaction; 
 
    private int updatedRows; 
 
    public String updateData() { 
        String retVal = "confirmation"; 
 
        try { 
 
            userTransaction.begin(); 
            insertTempData(); 
 
 CriteriaBuilder ...