如何在hibernate中按日期对结果排序?

busg9geu  于 2021-06-17  发布在  Mysql
关注(0)|答案(1)|浏览(724)

我正在使用hibernate从db获取json对象。我希望json对象应该包含最近创建的vgis中仅有的前两个的所有细节。但是我不知道当没有使用hql查询时,如何限制结果集,然后根据创建的日期进行排序。它正在从mysql数据库获取所有细节。

import java.util.Date;
import java.util.List;

import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.OneToMany;
import javax.persistence.OneToOne;
import javax.persistence.Table;

@Entity
@Table(name = "vgi", catalog = "coworkee5")
public class VGI {
@ManyToOne
@JoinColumn(name = "employee_id", referencedColumnName = "id", insertable = false, updatable = false)
private Employees employees;

public Employees getEmployees() {
    return employees;
}

public void setEmployees(Employees employees) {
    this.employees = employees;
}

@OneToMany(cascade = CascadeType.ALL, targetEntity = VgiGoals.class, mappedBy = "vgi")
private List<VgiGoals> vgiGoals;

public List<VgiGoals> getVgiGoals() {
    return vgiGoals;
}

public void setVgi_goals(List<VgiGoals> vgiGoals) {
    this.vgiGoals = vgiGoals;
}

public VGI() {
}

@Id
@Column(name = "id")
private String id;
@Column(name = "title")
private String vgi;
@Column(name = "employee_id")
private String employee_id;
@Column(name = "created_on")
private String created;

public String getId() {
    return id;
}

public void setId(String id) {
    this.id = id;
}

public String getvgi() {
    return vgi;
}

public void setvgi(String vgi) {
    this.vgi = vgi;
}

public String getEmployee_id() {
    return employee_id;
}

public void setEmployee_id(String employee_id) {
    this.employee_id = employee_id;
}

public String getCreated() {
    return created;
}

public void setCreated(String created) {
    this.created = created;
}

}

a9wyjsp7

a9wyjsp71#

添加 @OrderBy 注解排序如下。

@OneToMany(cascade = CascadeType.ALL, targetEntity = VgiGoals.class, mappedBy = "vgi")
@OrderBy("createdOn DESC")
private List<VgiGoals> vgiGoals;

注意:用vgigoals类中的日期字段替换createdon。
并限制在查询中使用下面的方法。

query.setFirstResult(1).setMaxResults(10);

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