Hibernate Criterion IN第1000条分手

嗨，我有这个大型的oracle hibernate Web应用程序，它似乎给出了这个错误

ORA-01795: maximum number of expressions in a list is 1000

我需要一个由某人测试的java代码作为一个hibernate用户定义的组件，在我的屏幕中添加到我的搜索java类，尽可能容易有人有这样的测试组件吗？

Answer 1

我尝试了以下代码来自链接 ，它似乎工作得很漂亮，我将粘贴代码，以防万一将来链接被破坏。

保持简单保持微笑:)

  /** * An utility method to build the Criterion Query IN clause if the number of parameter * values passed has a size more than 1000. Oracle does not allow more than * 1000 parameter values in a IN clause. Doing so a {@link SQLException} is * thrown with error code, 'ORA-01795: maximum number of expressions in a list is 1000'. * @param propertyName * @param values * @return */ import java.util.List; import org.hibernate.criterion.Restrictions; /** * * @author 2796 */ public class SplitHibernateIn { private static int PARAMETER_LIMIT = 999; public static org.hibernate.criterion.Criterion buildInCriterion(String propertyName, List values) { org.hibernate.criterion.Criterion criterion = null; int listSize = values.size(); for (int i = 0; i < listSize; i += PARAMETER_LIMIT) { List subList; if (listSize > i + PARAMETER_LIMIT) { subList = values.subList(i, (i + PARAMETER_LIMIT)); } else { subList = values.subList(i, listSize); } if (criterion != null) { criterion = Restrictions.or(criterion, Restrictions.in(propertyName, subList)); } else { criterion = Restrictions.in(propertyName, subList); } } return criterion; } } 

Answer 2

同样的想法，但使用javax Predicate。

 private static int PARAMETER_LIMIT = 999; private static Predicate createInStatement(CriteriaBuilder cb, Path fieldName, List values) { int listSize = values.size(); Predicate predicate = null; for (int i = 0; i < listSize; i += PARAMETER_LIMIT) { List subList; if (listSize > i + PARAMETER_LIMIT) { subList = values.subList(i, (i + PARAMETER_LIMIT)); } else { subList = values.subList(i, listSize); } if (predicate == null) { predicate = fieldName.in(subList); } else { predicate = cb.or(predicate, fieldName.in(subList)); } } return predicate; } 

和用法

 public List getBeanList(List pkList) { CriteriaBuilder cb = entityManager.getCriteriaBuilder(); CriteriaQuery query = cb.createQuery(Bean.class); Root root = query.from(Bean.class); // "Bean_" is a @StaticMetamodel(Bean.class) Predicate inStatement = createInStatement(cb, root.get(Bean_.pk), pkList); query.select(root).where(inStatement); return entityManager.createQuery(query).getResultList(); }