JPA 插入大型多對多

Question

我有這 2 個實體（商店和產品）我已經有了產品，我想將其分配給商店，問題是商店可能有數千種產品並且要“插入”我必須擁有這些產品在內存中，然后將商店與產品集一起保存。 這讓我有一個 StackOverflowError 並且效率非常低。

有沒有辦法做這樣的事情？

insert into product_store (product_id, store_id) VALUES (:productIds, :storeId)

實體：

@Entity
@Table(name = "stores")
data class Store(@Id
                 @GeneratedValue(strategy = GenerationType.IDENTITY)
                 val id: Long = 0,
                 @Column
                 val name: String,
                 @Column
                 val street: String,
                 @Column
                 val streetNumber: String,
                 @Column
                 val postalCode: Int,
                 @Column
                 val city: String,
                 @Column
                 val state: String,
                 @Column
                 val latitude: Double,
                 @Column
                 val longitude: Double,
                 @ManyToMany(fetch = FetchType.LAZY)
                 @JoinTable(name = "product_store",
                         joinColumns = [JoinColumn(name = "store_id")],
                         inverseJoinColumns = [JoinColumn(name = "product_id")])
                 val products: Set<Product>

) : DateAudit()

產品實體：

@Entity
@Table(name = "products")
data class Product(@Id
                   @GeneratedValue(strategy = GenerationType.IDENTITY)
                   val id: Long = 0,
                   @Column(nullable = false)
                   val codeBar: String,
                   @Column(nullable = false)
                   val name: String,
                   @Column(columnDefinition = "text")
                   val description: String,
                   @Column(columnDefinition = "text")
                   val ingredients: String?,
                   val picture: String,
                   @OneToMany(fetch = FetchType.EAGER, cascade = [CascadeType.PERSIST, CascadeType.MERGE, CascadeType.REFRESH])
                   val nutriments: Set<Nutriment>,
                   @ManyToOne(fetch = FetchType.EAGER)
                   @JoinColumn(name = "brand_id")
                   val brand: Brand,
                   @ManyToMany(fetch = FetchType.EAGER, cascade = [CascadeType.MERGE])
                   @JoinTable(name = "product_category",
                           joinColumns = [JoinColumn(name = "product_id")],
                           inverseJoinColumns = [JoinColumn(name = "category_id")])
                   val categories: Set<Category>
) : DateAudit()

Answer 1

像這樣固定

@Modifying
    @Query("INSERT INTO product_store (product_id, store_id) " +
            "(SELECT p.id, s.id FROM products p, stores s WHERE p.market_id IN (:productMarketIds) AND s.id = :storeId)", nativeQuery = true)
    fun saveProductsToStoreByProductMarketIds(storeId: Long, productMarketIds: Set<String>)