Question

我正在尝试将此SQL查询转换为Hibernate Criteria，但我不太确定我对Hibernate的新手是什么。

SELECT header.*,
(SELECT items.end_date from
    subTable sub,
    ItemTable items
    WHERE items.sub_id = sub.sub_id
    and header.header_id = sub.header_id
    order by items.end_date desc
    limit 1) as latestEndDate
from headerTable header
order by latestEndDate desc;

我可以创建子查询，但我对如何将其合并到主查询中感到茫然。

Long headerId = getHeaderId();
Criteria criteria = session.createCriteria(dataaccess.model.Item.class, "item");

DetachedCriteria headerSubQuery =
    DetachedCriteria.forClass(dataaccess.model.Header.class, "header")
.setProjection(Property.forName("header.headerId"))
.add(Restrictions.eq("headerId, headerId));

DetachedCriteria subTableQuery =
    DetachedCriteria.forClass(dataaccess.model.SubTable.class, "sub")
.setProjection(Property.forName("sub.subId)).add(
    Property.forName("header").in(headerSubQuery));

criteria.add(Property.forName("sub").in(subTableQuery));
criteria.addOrder(Order.desc("endDate"));
criteria.setMaxResults(1);

List<Items> items = criteria.list();

* HeaderTable和SubTable具有1：1的关系，并且只是出于遗留原因而存在。 SubTable拥有Items，但由于1：1的关系，HeaderTable还拥有Items（HeaderTable - ＆gt; SubTable - ＆gt; Items）。

该查询返回具有最新endDate的项目。我希望能够使用Hibernate查询头表并使用最新的endDate对其中一个项进行排序（如上面的SQL查询）。

感谢您的帮助。

Answer 1

我最后通过在我的Header模型中添加另一个字段并使用@Formula注释传递我的SQL查询来解决这个问题。

var delegate: NewLocationViewControllerDelegate!
var contacts = [CNContact]()

override func viewDidLoad() {
    super.viewDidLoad()
    UIApplication.sharedApplication().delegate as! AppDelegate
    // Do any additional setup after loading the view.
}//end

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

@IBAction func openContacts(sender: UIButton) {
    let contactPicker = CNContactPickerViewController()
    contactPicker.delegate = self;
    contactPicker.displayedPropertyKeys = [CNContactPhoneNumbersKey]

    self.presentViewController(contactPicker, animated: true, completion: nil)
}//end

func contactPicker(picker: CNContactPickerViewController, didSelectContactProperty contactProperty: CNContactProperty) {
    let contact = contactProperty.contact
    let phoneNumber = contactProperty.value as! CNPhoneNumber
    print(contact.givenName)
    print(phoneNumber.stringValue)
}//end

这允许我在我的标准下附加订单：

@Formula("(SELECT items.end_date from "
    + "subTable sub, "
    + "ItemTable items "
    + "WHERE items.sub_id = sub.sub_id "
    + "and header.header_id = sub.header_id "
    + "order by items.end_date desc "
    + "limit 1)")
private Date latestStartDate;

public getLatestStartDate() {
    return latestStartDate;
}

使用Hibernate Criteria按子查询结果排序

1 个答案: