Java Can';无法在hibernate中保存实体
我创建了简单的CRUD服务。有4个实体:客户、提供商、产品、交易Java Can';无法在hibernate中保存实体,java,hibernate,jpa,orm,hibernate-mapping,Java,Hibernate,Jpa,Orm,Hibernate Mapping,我创建了简单的CRUD服务。有4个实体:客户、提供商、产品、交易 Customer和Provider实体已将idAppId组合为以下结构: @Getter @Setter @Embeddable @NoArgsConstructor public class AppId implements Serializable { private String app; private String id; //... } 以下是我想要的业务逻辑: 提供者实体级联并创建产品实体。
Customer
和Provider
实体已将idAppId
组合为以下结构:
@Getter
@Setter
@Embeddable
@NoArgsConstructor
public class AppId implements Serializable {
private String app;
private String id;
//...
}
以下是我想要的业务逻辑:
提供者实体级联并创建产品实体。
当客户与提供商达成交易时,我需要创建实体交易
,它不会级联任何其他实体。
它只是有一些字段,这些字段涉及交易的提供者、客户和产品
我创建了一些提供商和客户。
然后我尝试创建交易,但我得到了customer和provider字段null
以下是我的实体定义:
提供者
:
@Entity
@Getter
@Setter
@ToString
@NoArgsConstructor
@Table(name = "provider")
public class Provider implements Serializable {
@EmbeddedId
@Column(name = "appid")
private AppId appId;
@Column(name = "name")
private String name;
@Column(name = "firstname")
private String firstName;
@Column(name = "lastname")
private String lastName;
@Column(name = "latitude")
private float latitude;
@Column(name = "longitude")
private float longitude;
@Column(name = "work_date")
private Date workDate;
@ManyToMany(cascade = CascadeType.ALL)
@JoinTable(name = "provider_product"
, joinColumns = {
@JoinColumn(name = "provider_app"),
@JoinColumn(name = "provider_id")
}
, inverseJoinColumns = @JoinColumn(name="product_id"))
private Set<Product> products;
@OneToMany(cascade = CascadeType.ALL)
@JoinColumns({
@JoinColumn(name = "app", referencedColumnName = "app", updatable = false, insertable = false),
@JoinColumn(name = "id", referencedColumnName = "id", updatable = false, insertable = false)
})
private List<Deal> dealList = new ArrayList<>();
}
@Entity
@Getter
@Setter
@ToString
@NoArgsConstructor
@Table(name = "customer")
public class Customer implements Serializable {
@EmbeddedId
@Column(name = "appid")
private AppId appId;
@Column(name = "firstname")
private String firstName;
@Column(name = "lastname")
private String lastName;
public Customer(AppId appId, String firstName, String lastName) {
this.appId = appId;
this.firstName = firstName;
this.lastName = lastName;
}
}
产品
:
@Entity
@Getter
@Setter
@ToString
@NoArgsConstructor
@Table(name = "product")
public class Product implements Serializable {
@Id
@GeneratedValue
private long id;
@Column(name = "name")
private String name;
@Column(name = "cost")
private long cost;
}
交易
:
@Entity
@Getter
@Setter
@ToString
@NoArgsConstructor
@Table(name = "deal")
public class Deal implements Serializable {
@Id
@GeneratedValue
private long id;
@ManyToOne
@JoinColumns({
@JoinColumn(name = "provider_app", referencedColumnName = "app", insertable = false, updatable = false),
@JoinColumn(name = "provider_id", referencedColumnName = "id", insertable = false, updatable = false)
})
private Provider provider;
@ManyToOne
@JoinColumns({
@JoinColumn(name = "customer_app", insertable = false, updatable = false),
@JoinColumn(name = "customer_id", insertable = false, updatable = false)
})
private Customer customer;
@ManyToMany
@JoinTable(name = "deal_product"
, joinColumns = @JoinColumn(name="deal_id", insertable = false, updatable = false)
, inverseJoinColumns = @JoinColumn(name="product_id", insertable = false, updatable = false))
private Set<Product> product;
// deal is complete when provider entered deal id
@Column(name = "closed")
private boolean closed = false;
}
@实体
@吸气剂
@塞特
@托斯特林
@诺尔格构装师
@表(name=“deal”)
公共类处理实现了可序列化{
@身份证
@生成值
私人长id;
@许多酮
@连接柱({
@JoinColumn(name=“provider\u app”,referencedColumnName=“app”,insertable=false,updateable=false),
@JoinColumn(name=“provider\u id”,referencedColumnName=“id”,insertable=false,updateable=false)
})
私人供应商;
@许多酮
@连接柱({
@JoinColumn(name=“customer\u app”,insertable=false,updateable=false),
@JoinColumn(name=“customer\u id”,insertable=false,updateable=false)
})
私人客户;
@许多
@JoinTable(name=“交易\产品”
,joinColumns=@JoinColumn(name=“deal\u id”,insertable=false,updateable=false)
,inverseJoinColumns=@JoinColumn(name=“product_id”,insertable=false,updateable=false))
私有集合产品;
//当提供商输入交易id时,交易完成
@列(name=“closed”)
私有布尔闭合=假;
}
通过删除交易
实体中客户
和提供商
字段的insertable=false
,一切正常
{
"id": 5,
"provider": {
"appId": {
"app": "vk",
"id": "123"
},
"name": null,
"firstName": null,
"lastName": null,
"latitude": 0,
"longitude": 0,
"workDate": null,
"products": null,
"dealList": []
},
"customer": {
"appId": {
"app": "vk",
"id": "123"
},
"firstName": null,
"lastName": null
},
"product": [
{
"id": 2,
"name": "Temp",
"cost": 100
}
],
"closed": false
}
我可以得到以下的回应
字段上的insertable=false
意味着在保存实体时,不会保存该字段的值,而是将该字段显式设置在某个位置
insertable=true
并不意味着您将创建新的客户
或提供商
,这是由CascadeType
处理的,为什么Deal
实体中的provider
和customer
字段有insertable=false
呢?@苛刻,因为在创建Deal
实体时,您不能创建新的provider
或customer
<代码>交易只能在以前创建了提供商
和客户
的情况下创建。请在创建和保存交易的位置共享代码,不查看任何内容很难说出任何内容that@harsh链接到项目:当创建不正确的交易时,它会重写提供者实体