H2参照完整性约束违反

Question

我正在使用Spring Boot应用程序的H2数据库。 我创建了一个帐户服务类，用于保留account，account_type和customer的数据。 请在下面找到代码：

默认构造函数，Getter Setter，使用所有字段的构造函数，toString，hashCode，等式存在于下面的每个类中。

充当实体的帐户POJO以及数据传输对象（即DTO）

@Entity
@Table(name = "ACCOUNT")
@XmlRootElement
@XmlAccessorType(XmlAccessType.FIELD)
public class Account {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private long id;

    @OneToOne
    @JoinColumn(name="account_type_id")
    private AccountType accountType;

    @Temporal(TemporalType.DATE)
    @Column(name = "date_created", unique = true, nullable = false, length = 10)
    private Date dateCreated;

    @Column(nullable = false)
    private double originalCreditAmount;

    @Column(nullable = false)
    private double balanceAmount;

    @Column(nullable = false)
    private boolean fullyPaid;

    @Column(nullable = false)
    private int term;

    @Column(nullable = false)
    private float rateOfInterest;

    @Column(nullable = false)
    private boolean escrowAttached;

    @Column(nullable = false)
    private boolean pmiAttached;

    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "customer_id", nullable = false)
    @JsonBackReference
    Customer customer;
}

用作实体的AcountType POJO以及数据传输对象（即DTO）

@Entity
@Table(name = "ACCOUNT_TYPE")
@XmlRootElement
@XmlAccessorType(XmlAccessType.FIELD)
public class AccountType {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private long id;

    @Column(nullable = false)
    private String accountTypeName;

    @Column(nullable = false)
    private String accountTypeDescription;

}

客户POJO充当实体以及数据传输对象（即DTO）

@Entity
@Table(name = "customer")
@XmlRootElement
@XmlAccessorType(XmlAccessType.FIELD)
public class Customer {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private long id;

    @Column(nullable = false)
    private String firstName;

    @Column(nullable = false)
    private String lastName;

    @Column(nullable = false)
    private String socialSecurityNumber;

    @Temporal(TemporalType.DATE)
    @Column(name = "dob", unique = true, nullable = false, length = 10)
    private Date dateOfBirth;

    @Column(nullable = false)
    private double totalLoanAmount;

    @Column(nullable = false)
    private int bonusPoints;

    @Temporal(TemporalType.DATE)
    @Column(name = "customer_since", unique = true, nullable = false, length = 10)
    private Date memberSince;

    @OneToMany(fetch = FetchType.LAZY, mappedBy = "customer")
    @JsonManagedReference
    private Set<Address> addresses = new HashSet<Address>();

    @OneToMany(fetch = FetchType.LAZY, mappedBy = "customer")
    @JsonManagedReference
    private Set<Account> accounts = new HashSet<Account>();

    @OneToMany(fetch = FetchType.LAZY, mappedBy = "customer")
    @JsonManagedReference
    private Set<Contact> contacts = new HashSet<Contact>();


    @OneToMany(fetch = FetchType.LAZY, mappedBy = "customer")
    @JsonManagedReference
    private Set<Education> education = new HashSet<Education>();

    @OneToMany(fetch = FetchType.LAZY, mappedBy = "customer")
    @JsonManagedReference
    private Set<Employment> employment = new HashSet<Employment>();

    @OneToMany(fetch = FetchType.LAZY, mappedBy = "customer")
    @JsonManagedReference
    private Set<Investment> investments = new HashSet<Investment>();


    @OneToMany(fetch = FetchType.LAZY, mappedBy = "customer")
    @JsonManagedReference
    private Set<Liability> liabilities = new HashSet<Liability>();


    @Column()
    private int rating;
}

当我尝试进行POST呼叫以创建客户，帐户和帐户类型时，如下所示：

{
"customer": {
"id": 1,
"firstName": "Jordaya",
"lastName": "Scott",
"dateOfBirth": "1980-04-12",
"totalLoanAmount": 287000,
"bonusPoints": 70000,
"memberSince": "2000-04-11",
"socialSecurityNumber": "449-84-4944",
"rating": 7
},
"accountType": {
"id": 2,
"accountTypeName": "Savings A/C",
"accountTypeDescription": "Savings Account"
},
"dateCreated": "2017-01-01",
"originalCreditAmount": 300000,
"balanceAmount": 200000,
"fullyPaid": false,
"term": 30,
"rateOfInterest": 3.25,
"escrowAttached": false,
"pmiAttached": false
}

失败并显示以下错误。

org.h2.jdbc.JdbcSQLException: Referential integrity constraint violation: "FKGW84MGPACW9HTDXCS2J1P7U6J: PUBLIC.ACCOUNT FOREIGN KEY(ACCOUNT_TYPE_ID) REFERENCES PUBLIC.ACCOUNT_TYPE(ID) (2)"; SQL statement:
insert into account (account_type_id, balance_amount, customer_id, date_created, escrow_attached, fully_paid, original_credit_amount, pmi_attached, rate_of_interest, term, id) values (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)

请更正我对错误的理解。 我认为此错误即将到来，因为没有在数据库中创建“客户”和“帐户类型”记录，因此当在数据库中插入“帐户”时，无法找到帐户类型ID，因此会引发此错误。

Answer 1

是的，如果不存在具有匹配ID的实体，则将违反完整性约束。

如果要实现相关实体的级联创建，则应将cascade添加到关系映射中。 例如：

@OneToOne(cascade = CascadeType.ALL...)

但是即使这样，当您发送带有特定ID的JSON数据并且它们在数据库中不存在时，也会出现此错误。