我有一个具有boolean
属性的实体。
class MyEntity {
@Basic(optional = false)
@Column(name = "FLAG")
private boolean flag;
}
如何使用true
?
flag
字段 // UPDATE MyEntity AS e SET e.flag = TRUE
final CriteriaBuilder builder = entityManager.getCriteriaBuilder();
final CriteriaUpdate<MyEntity> update
= builder.createCriteriaUpdate(MyEntity.class);
final Root<MyEntity> root = criteriaUpdate.from(MyEntity.class);
update.set(root.get(ProfileClue_.flag), ???);
使用纯JPA我会做
之类的事情final CriteriaBuilder builder = entityManager.getCriteriaBuilder();
final CriteriaUpdate<MyEntity> update = builder.createCriteriaUpdate(MyEntity.class);
final Root<MyEntity> root = criteriaUpdate.from(MyEntity.class);
Expression trueLiteral = builder.literal(Boolean.TRUE);
update.set(root.get(ProfileClue_.flag), trueLiteral);
使用更高级的JPA提供商,该提供商支持查询其他部分的参数,而不是JPA规格授权(由Datanucleus JPA和其他可能性支持),您可以使其成为参数。
final CriteriaBuilder builder = entityManager.getCriteriaBuilder();
final CriteriaUpdate<MyEntity> update = builder.createCriteriaUpdate(MyEntity.class);
final Root<MyEntity> root = criteriaUpdate.from(MyEntity.class);
ParameterExpression<String> param = builder.parameter(Boolean.class, "myParam");
update.set(root.get(ProfileClue_.flag), param);