java - EclipseLink jpql "where clause"比较时间戳未按预期工作

Question

我选择使用时间戳列的 jpql“where 子句”没有按预期“过滤”。

它似乎对时间戳的“日期”部分敏感，但是忽略了“时间”部分。

table1.tmstmp 列定义为:“TMSTMP TIMESTAMP NOT NULL”

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;

它的用法如下:

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

例如，当上面的时间戳变量(“tmstmp”)等于“2016-06-30T09:28:33.247-04:00”时，它将返回日期部分为:2016-06 的所有记录-30。

有什么想法吗？

我想依靠“where 子句”来使用整个时间戳来显式选择。

更新

我使用“CAST”函数修改了我的查询(似乎需要 native 查询)，如下所示，并且它似乎一致工作:

//...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(); 

<小时/>

WebLogic 12.1.3

DB2

Java 8

EclipseLink 2.1

Answer 1

下面是对我有用的...

假设...

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

这是一种方法...

    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(); 

还有另一种方法...

    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();