Question

它说我不能使用这类变量的运算符，但为什么呢？

我的想法是有两个文本字段，一个用于接收结束日期，另一个用于开始日期，作为参数值传递，然后返回具有亲属日期的对象列表

[59, 66] The identification variable 'endDate' cannot be used in conjunction   `with the <= operator.
[35, 44] The identification variable 'startDate' is not defined in the FROM clause.
[59, 66] The identification variable 'endDate' is not defined in the FROM clause.

即时通讯使用jDatachosser，以及我如何获取日期

String startDate= ((JTextField) txtDatainicio.getDateEditor().getUiComponent()).getText();
    String endDate= ((JTextField) txtDataFim.getDateEditor().getUiComponent()).getText();
    SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");

那就是返回列表的方法

 public List<Ordemservico> findDates(String date1, String date2) {


    EntityManager em = getEntityManager();
    em.getTransaction().begin();
    TypedQuery<Ordemservico> query = em.createQuery("select u from Ordemservico u where startDate>= :date1 AND endDate <= :date2", Ordemservico.class);
    query.setParameter("date1", date1);
    query.setParameter("date2", date2);
    List<Ordemservico> layoutsSelected = query.getResultList();

    em.getTransaction().commit();

    return layoutsSelected;
}

我的classe

public class Ordemservico implements Serializable {
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Basic(optional = false)
@Column(name = "idordemservico")
private Integer idordemservico;
@Column(name = "identificadoros")
private Integer identificadoros;
@Column(name = "mes")
private Integer mes;
@Column(name = "ano")
private Integer ano;
@Column(name = "assunto")
private String assunto;
@Basic(optional = false)
@Column(name = "publicitario")
private String publicitario;
@Basic(optional = false)
@Column(name = "layoutos")
private String layoutos;
@Basic(optional = false)
@Column(name = "startDate")
@Temporal(TemporalType.DATE)
private Date startDate;
@Column(name = "endDate")
@Temporal(TemporalType.DATE)
private Date endDate;
@Column(name = "dataevento")

Answer 1

在JPA中，当你创建查询时，你必须把对象放到属性所属的位置，试试：

TypedQuery<Ordemservico> query = em.createQuery("select u from Ordemservico u where u.startDate>= :date1 AND u.endDate <= :date2", Ordemservico.class);

查看条件 u。 startDate＆gt; =：date1而不仅仅是startDate＆gt; =：date1

Answer 2

达沙克给出的解决方案是正确的，要引用实体的财产，你必须提到哪个实体。除此之外，实体的startDate和endDate的类型为java.util.Date。

@Column(name = "startDate")
@Temporal(TemporalType.DATE)
private Date startDate;
@Column(name = "endDate")
@Temporal(TemporalType.DATE) 
private Date endDate;

但是您要将查询中的日期参数设置为字符串。相反，他们必须是日期类型。

findDates(String date1, String date2)
...
query.setParameter("date1", date1);//value should be of Date type
query.setParameter("date2", date2);//same as above

更改后，它应如下所示：

static SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");

public List<Ordemservico> findDates(String date1, String date2) {
    Date parsedDate1 = sdf.parse(date1);
    Date parsedDate2 = sdf.parse(date2);
    EntityManager em = getEntityManager();
    em.getTransaction().begin();
    TypedQuery<Ordemservico> query = em.createQuery("select u from Ordemservico u where u.startDate>= :date1 AND u.endDate <= :date2", Ordemservico.class)
    query.setParameter("date1", parsedDate1);// value must be date as the property we are comparing is of Date type
    query.setParameter("date2", parsedDate2);// same as above
    List<Ordemservico> layoutsSelected = query.getResultList();
    em.getTransaction().commit();
    return layoutsSelected;
}

此外，如果您只想在日期级别比较忽略时间值，您可以查看以下方法：

//Class: TypedQuery
setParameter(String name, Date value,TemporalType temporalType);

使用jpa在两个日期列之间搜索

2 个答案: