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[英]Spring Boot JPA : How to delete child entity of a Many to One relation
[英]How to delete entity with many to many relation? JPA
我不知道如何刪除這個。 只有一件事我注意到,在刪除名為“OrderToProvider-Goods”的表中的所有實體后,OrderToProvider 將被刪除。
代碼:
OrderToProvider
public class OrderToProvider {
@GeneratedValue (strategy = GenerationType.IDENTITY)
@Id
private int id;
@Basic
private int price;
@Basic
private Date dataOfOrder;
@Basic
private Date dateOfProcessing;
@ManyToOne(optional = false)
private main.data.Provider provider;
@ManyToMany (cascade = CascadeType.ALL)
private Collection<Good> goods;
好的
public class Good implements Comparable<Good>{
@GeneratedValue (strategy = GenerationType.IDENTITY)
@Id
private int id;
@Basic
private String name;
@Basic
private String model;
@Basic
private int price;
@Basic
private String type;
@Basic
private int amount;
@ManyToOne(optional = false)
private Provider provider;
要從數據庫中刪除OrderToProvider
,首先從數據庫中檢索它,然后setGoods(null)
和setProvider(null)
,然后再將其刪除。 這應該適用於您具有正確實施的setters
的條件。
我希望這是有幫助的。
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