Question

我想创建一个在线商店。我已经定义了一个用户表和一个订单表，它们之间有一对多的关系。我想在这个表中插入一些东西，我收到了这个错误：

无法添加或更新子行：外键约束失败（restaurant_java。order_food，CONSTRAINT fk_order_food_user_id FOREIGN KEY（user_id）参考users （id）ON UPETE CASCADE ON UPDATE CASCADE）

以下是如何创建表格以及如何定义限制因素。

用户表：

CREATE TABLE users (
    id              INT(10) UNSIGNED AUTO_INCREMENT NOT NULL,
    firstname       VARCHAR(200) NOT NULL,
    lastname        VARCHAR(200) NOT NULL,
    cnp             VARCHAR(13) NOT NULL,
    email           VARCHAR(50) NOT NULL,
    password        VARCHAR(100) NOT NULL,
    phone           VARCHAR(10) NOT NULL,
    iban            VARCHAR(20) NOT NULL,
    address         VARCHAR(200) NOT NULL,
    KEY (id)
);
ALTER TABLE users ADD CONSTRAINT pk_users_id PRIMARY KEY (id);

订购食物：

CREATE TABLE order_food (
    id          INT(10) UNSIGNED AUTO_INCREMENT NOT NULL,
    user_id     INT(10) UNSIGNED,
    created     datetime DEFAULT NOW(),
    closed      datetime,
    total       float,
    KEY(id)
);
ALTER TABLE order_food ADD CONSTRAINT pk_order_food_id PRIMARY KEY (id);
ALTER TABLE order_food ADD CONSTRAINT fk_order_food_user_id FOREIGN KEY (user_id) REFERENCES users(id) ON UPDATE CASCADE ON DELETE CASCADE;

我还想补充一点，我试图用hibernate插入mySql数据库。我该如何解决这个问题？

修改以下是我尝试插入新用户的方法：

session.beginTransaction();

Collection<OrderFoodEntity> orderFoodEntities = new HashSet<>();
OrderFoodEntity orderFoodEntity = new OrderFoodEntity();

orderFoodEntity.setTotal((float) 0);
orderFoodEntities.add(orderFoodEntity);
user.setOrderFoodsById(orderFoodEntities);
user.addOrder();

session.persist(user);
session.getTransaction().commit();

实体在这里：

import javax.persistence.*;
import java.util.Collection;

@Entity
@Table(name = "users", schema = "", catalog = "restaurant_java")
public class UsersEntity {
    private int id;
    private String firstname;
    private String lastname;
    private String cnp;
    private String email;
    private String password;
    private String phone;
    private String iban;
    private String address;
    @OneToMany(mappedBy = "usersByUserId", cascade = {CascadeType.ALL})
    private Collection<OrderFoodEntity> orderFoodsById;

    @Id
    @Column(name = "id", nullable = false, insertable = true, updatable = true)
    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    @Basic
    @Column(name = "firstname", nullable = false, insertable = true, updatable = true, length = 200)
    public String getFirstname() {
        return firstname;
    }

    public void setFirstname(String firstname) {
        this.firstname = firstname;
    }

    @Basic
    @Column(name = "lastname", nullable = false, insertable = true, updatable = true, length = 200)
    public String getLastname() {
        return lastname;
    }

    public void setLastname(String lastname) {
        this.lastname = lastname;
    }

    @Basic
    @Column(name = "cnp", nullable = false, insertable = true, updatable = true, length = 13)
    public String getCnp() {
        return cnp;
    }

    public void setCnp(String cnp) {
        this.cnp = cnp;
    }

    @Basic
    @Column(name = "email", nullable = false, insertable = true, updatable = true, length = 50)
    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    @Basic
    @Column(name = "password", nullable = false, insertable = true, updatable = true, length = 100)
    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    @Basic
    @Column(name = "phone", nullable = false, insertable = true, updatable = true, length = 10)
    public String getPhone() {
        return phone;
    }

    public void setPhone(String phone) {
        this.phone = phone;
    }

    @Basic
    @Column(name = "iban", nullable = false, insertable = true, updatable = true, length = 20)
    public String getIban() {
        return iban;
    }

    public void setIban(String iban) {
        this.iban = iban;
    }

    @Basic
    @Column(name = "address", nullable = false, insertable = true, updatable = true, length = 200)
    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }

    public void addOrder() {
        for (OrderFoodEntity orderFoodEntity : orderFoodsById) {
            orderFoodEntity.setUsersByUserId(this);
        }
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;

        UsersEntity that = (UsersEntity) o;

        if (id != that.id) return false;
        if (firstname != null ? !firstname.equals(that.firstname) : that.firstname != null) return false;
        if (lastname != null ? !lastname.equals(that.lastname) : that.lastname != null) return false;
        if (cnp != null ? !cnp.equals(that.cnp) : that.cnp != null) return false;
        if (email != null ? !email.equals(that.email) : that.email != null) return false;
        if (password != null ? !password.equals(that.password) : that.password != null) return false;
        if (phone != null ? !phone.equals(that.phone) : that.phone != null) return false;
        if (iban != null ? !iban.equals(that.iban) : that.iban != null) return false;
        if (address != null ? !address.equals(that.address) : that.address != null) return false;

        return true;
    }

    @Override
    public int hashCode() {
        int result = id;
        result = 31 * result + (firstname != null ? firstname.hashCode() : 0);
        result = 31 * result + (lastname != null ? lastname.hashCode() : 0);
        result = 31 * result + (cnp != null ? cnp.hashCode() : 0);
        result = 31 * result + (email != null ? email.hashCode() : 0);
        result = 31 * result + (password != null ? password.hashCode() : 0);
        result = 31 * result + (phone != null ? phone.hashCode() : 0);
        result = 31 * result + (iban != null ? iban.hashCode() : 0);
        result = 31 * result + (address != null ? address.hashCode() : 0);
        return result;
    }


    public Collection<OrderFoodEntity> getOrderFoodsById() {
        return orderFoodsById;
    }

    public void setOrderFoodsById(Collection<OrderFoodEntity> orderFoodsById) {
        this.orderFoodsById = orderFoodsById;
    }

    @Override
    public String toString() {
        return "UsersEntity{" +
                "id=" + id +
                ", firstname='" + firstname + '\'' +
                ", lastname='" + lastname + '\'' +
                ", cnp='" + cnp + '\'' +
                ", email='" + email + '\'' +
                ", password='" + password + '\'' +
                ", phone='" + phone + '\'' +
                ", iban='" + iban + '\'' +
                ", address='" + address + '\'' +
                ", order= " + orderFoodsById +
                '}';
    }
}

和

import javax.persistence.*;
import java.sql.Timestamp;
import java.util.Collection;

@Entity
@Table(name = "order_food", schema = "", catalog = "restaurant_java")
public class OrderFoodEntity {
    private int id;
    private int userId;
    private Timestamp created;
    private Timestamp closed;
    private Float total;
    @ManyToOne(cascade = {CascadeType.ALL})
    private UsersEntity usersByUserId;
    private Collection<OrderLineEntity> orderLinesById;

    @Id
    @Column(name = "id", nullable = false, insertable = true, updatable = true)
    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    @Basic
    @Column(name = "user_id", nullable = false, insertable = true, updatable = true)
    public int getUserId() {
        return userId;
    }

    public void setUserId(int userId) {
        this.userId = userId;
    }

    @Basic
    @Column(name = "created", nullable = true, insertable = true, updatable = true)
    public Timestamp getCreated() {
        return created;
    }

    public void setCreated(Timestamp created) {
        this.created = created;
    }

    @Basic
    @Column(name = "closed", nullable = true, insertable = true, updatable = true)
    public Timestamp getClosed() {
        return closed;
    }

    public void setClosed(Timestamp closed) {
        this.closed = closed;
    }

    @Basic
    @Column(name = "total", nullable = true, insertable = true, updatable = true, precision = 0)
    public Float getTotal() {
        return total;
    }

    public void setTotal(Float total) {
        this.total = total;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;

        OrderFoodEntity that = (OrderFoodEntity) o;

        if (id != that.id) return false;
        if (userId != that.userId) return false;
        if (created != null ? !created.equals(that.created) : that.created != null) return false;
        if (closed != null ? !closed.equals(that.closed) : that.closed != null) return false;
        if (total != null ? !total.equals(that.total) : that.total != null) return false;

        return true;
    }

    @Override
    public int hashCode() {
        int result = id;
        result = 31 * result + userId;
        result = 31 * result + (created != null ? created.hashCode() : 0);
        result = 31 * result + (closed != null ? closed.hashCode() : 0);
        result = 31 * result + (total != null ? total.hashCode() : 0);
        return result;
    }


    @JoinColumn(name = "user_id", referencedColumnName = "id", nullable = false, insertable = true, updatable = true)
    public UsersEntity getUsersByUserId() {
        return usersByUserId;
    }

    public void setUsersByUserId(UsersEntity usersByUserId) {
        this.usersByUserId = usersByUserId;
    }

    @OneToMany(mappedBy = "orderFoodByOrderId")
    public Collection<OrderLineEntity> getOrderLinesById() {
        return orderLinesById;
    }

    public void setOrderLinesById(Collection<OrderLineEntity> orderLinesById) {
        this.orderLinesById = orderLinesById;
    }

    @Override
    public String toString() {
        return "OrderFoodEntity{" +
                "id=" + id +
                ", userId=" + userId +
                ", created=" + created +
                ", closed=" + closed +
                ", total=" + total +
                '}';
    }
}

感谢。

Answer 1

表{() => { this.props.togglePreviewModal() }}中没有列user_id。你拥有的是order_line，因为你已经在这个TABLE中有order_id，所以没有意义。

确保这是正确的，并确保您插入id {或order_id我认为应该是您的情况）user_id来自您的id }表。

无法添加或更新子行：外键约束失败 - OneToMany

1 个答案: