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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。我想插入这个表的东西，我收到此错误：无法添加或更新子行：外键约束失败 - OneToMany
Cannot add or update a child row: a foreign key constraint fails (
restaurant_java.order_food, CONSTRAINTfk_order_food_user_idFOREIGN KEY (user_id) REFERENCESusers(id) ON DELETE CASCADE ON UPDATE CASCADE)
这里是我怎样才能创建的表和如何我定义contrains。
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);
订购食品：
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，我试图与休眠到MySQL数据库中插入。我该如何解决这个问题？
编辑： 这里是我试图插入一个新的用户：
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();
而且实体是在这里：
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 +
'}';
}
}
谢谢。
您可以添加插入查询或至少您用于插入数据的代码吗？ – thsorens