Question

我有一个查询，我想在我的产品模型中编写

select * from shop inner join product on product.shops_id=shop.id where product.name=keyword

Shop.java

public class Shop extends Model {

    @Id
    @SequenceGenerator(name="shop_gen", sequenceName="shop_id_seq", allocationSize=1)
    @GeneratedValue(strategy=GenerationType.SEQUENCE, generator="shop_gen")
    @Column(name="id")
    public Long id;

    @Required
    public String name;

    @Required
    public String addressLine1;

    public String addressLine2;

    public String addressLine3;

    @Required
    public String city;

    @Required
    public String town;

    @Required
    public String phoneNumber;

    @OneToMany(mappedBy = "shops",cascade = CascadeType.REMOVE)
    public List<Product> products=new ArrayList<>();


    @Required
    @OneToOne
    public String category;

    @Lob
    @Column(name = "shop_pic")
    public  byte[] shop_pic;


    @ManyToOne
    @Required
    public User owner;

}

Product.java

public class Product extends Model {
   @Id
    @SequenceGenerator(name="product_gen", sequenceName="product_id_seq", allocationSize=1)
    @GeneratedValue(strategy=GenerationType.SEQUENCE, generator="product_gen")
    @Column(name="id")
    public Long id;
    @Required
    public String name;
    @Required
    public Float price;
    @OneToOne
    @Required
    public String category;
    @ManyToOne
    public Shop shops;
}

我的主要目的是找到有特定产品的商店列表。

每次关键字都会改变。我提到了类似的问题，但他们理解其中的任何一个。任何帮助将不胜感激

Answer 1

如果你的模特有适当的关系，那就是：

Shop.find.where().like("product.name", keyword).findList();

无论如何，我们对你的模特一无所知。

Answer 2

这是您问题的解决方案：

首先将Finder添加到Product class

public static Finder<Long,Product> find = new Finder<Long,Product>(
    Long.class, Product.class
);

在Product类中将属性shops更改为shop。当有单个对象时，给出复数名称是不合适的。

然后，检索包含给定名称产品的商店列表，添加与此类似的代码：

List<Product> productList = Product.find.where().like("name", keyword).findList();
List<Shop> shopList = new ArrayList<Shop>();
for(Product product:productList)
    shopList.add(product.shop);

内部联接在play框架ebean中

2 个答案: