Question

我使用时间戳列选择的jpql ＆＃34; where子句＆＃34; 不会＆＃34;过滤＆＃34;正如所料。

它似乎对＆＃34; date＆＃34;时间戳的一部分，但忽略了＆＃34;时间＆＃34;部分。

table1.tmstmp列定义为：＆＃34; TMSTMP TIMESTAMP NOT NULL＆＃34;

table1实体包含以下命名查询...

@NamedQuery(name = "table1.getUpdTime", query = "SELECT e FROM table1 e     
WHERE e.tmstmp >= :tmstmp order by e.tmstmp asc")

tmstmp属性定义如下......

@Column(name = "TMSTMP", nullable = false)
private Timestamp tmstmp;

像这样使用......

TypedQuery<EsEvnt> query = em.createNamedQuery("table1.getUpdTime",
table1.class).setParameter("tmstmp", tmstmp);

例如，当上面的Timestamp变量（＆＃34; tmstmp＆＃34;）等于＆＃34; 2016-06-30T09：28：33.247-04：00＆＃34;时，它返回全部记录日期部分为：2016-06-30。

有什么想法吗？

我想依赖＆＃34; where子句＆＃34;明确选择使用整个时间戳。

谢谢！

更新

我使用＆＃34; CAST＆＃34;修改了我的查询（似乎需要本机查询）。功能，如下所示，它似乎一致地工作......

//...note, date is in ISO format...
LocalDateTime ldt = LocalDateTime.parse(tmstmpString, DateTimeFormatter.ISO_DATE_TIME);
Timestamp tmstmp = Timestamp.valueOf(ldt);
- 
-
-
// (see "native query", coded below)...
Query query = em.createNativeQuery("SELECT * FROM table1 e WHERE e.tmstmp >= CAST(?1 as TIMESTAMP)", Table1.class)  
        .setParameter(1, tmstmp);  
List<Table1> resultList = query.getResultList();

谢谢！：）

WebLogic 12.1.3

DB2

Java 8

EclipseLink 2.1

Answer 1

Below, is what worked for me...

Assuming...

    //...note, date is in ISO format...
    LocalDateTime ldt = LocalDateTime.parse(tmstmpString, DateTimeFormatter.ISO_DATE_TIME);
    Timestamp tmstmp = Timestamp.valueOf(ldt);

Here's one way...

    Query query = entityManager.createNativeQuery("SELECT * FROM table1 e WHERE e.tmstmp >= CAST(?1 as TIMESTAMP)", Table1.class)  
            .setParameter(1, tmstmp);  
    List<Table1> resultList = query.getResultList();

Here's another way...

    CriteriaBuilder criteriaBuilder = entityManager.getCriteriaBuilder();
    CriteriaQuery<Table1> criteriaQuery = criteriaBuilder.createQuery(Table1.class);
    Root<Table1> table1 = criteriaQuery.from(Table1.class);

    Expression<Byte> expression = table1.get("tmstmp"); // ...NOTE: column name is "tmstmp"...
    Expression<Timestamp> castFunction = criteriaBuilder.function("TIMESTAMP", Timestamp.class, expression);
    Predicate predicate = criteriaBuilder.greaterThanOrEqualTo(castFunction, tmstmp);

    //NOTE: should be able to add to predicate...
    //      e.g.,   
    //          predicate = criteriaBuilder.and(predicate, otherPredicate);

    criteriaQuery.where(predicate);
    TypedQuery<Table1> query = entityManager.createQuery(criteriaQuery);
    List<Table1> resultList = query.getResultList();

Answer 2

这对你有用吗？

query.setParameter("tmstmp", tmstmp, TemporalType.DATE)

更新：

@Temporal(TemporalType.TIMESTAMP)
@Column(name = "TMSTMP", nullable = false)
private Date tmstmp;

EclipseLink jpql＆＃34; where子句＆＃34;比较时间戳不能按预期工作

2 个答案: