Question

我有一个查询，当我使用NativeQuery时工作正常，但我需要使用EJB查询来解决我的问题。任何人都可以帮我重新格式化我的查询，这样它也适用于EJB吗？

这是Native版本

Query query = getEntityManager.createNativeQuery("WITH src as ("
+ "Select distinct TRUNC(CreationDate) a" 
+ "From myTable)"
+ "Select src.a from src Order by src.a desc");

myTable的类是实体类型。属性如下

    @Id
    private Long Id; 

    @Column(nullable = false)
    private String Name;

    @Column(length = 30, nullable = false)
    private Timestamp CreationDate;

属性与上面的setter和getter一样。（除了ID）感谢

Answer 1

SELECT DISTINCT 
    TRUNC(CreationDate) as a
        FROM 
            (SELECT CreationDate  FROM myTable ORDER BY CreationDate DESC)

Answer 2

试试这个：

Query query = getEntityManager.createQuery(
                "select DISTINCT TRUNC(src.CreationDate) 
                   from myTable src 
                  ORDER by src.CreationDate"
              );
List<Object[]> rows = query.list();
for (Object[] row: rows) {
    System.out.println("My date" + row[0]);
}

使用TRUNC和WITH的EJB查询

2 个答案: