Hibernate在映射Java类时不添加引用约束(SpringBoot应用程序)

第一次使用SpringBoot和Hibernate。

我在画我的地图 和 角色.java 类到NetBeans中的MySQL数据库。除了一个细节,一切都很好。

当我在 服务 user_role 表(@ManyToMany的结果),它允许我,即使还没有创建用户或角色。我希望它会提示我一些错误,比如说我插入的用户ID不存在。

pgAdmin公司 好吧,这是一个重大的不。

如果这是默认行为,请告诉我如何重写它,如果不是,这是我的代码,其中有错误。

用户.java

package hello;

import java.util.Set;
import javax.persistence.Access;
import javax.persistence.AccessType;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.JoinTable;
import javax.persistence.ManyToMany;
import javax.persistence.Transient;

@Entity // This tells Hibernate to make a table out of this class
public class User {

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

    private String name;
    private String email;
    private String username;
    private String password;
    private String passwordConfirm;

    @ManyToMany(targetEntity = Role.class)
    @Access(AccessType.FIELD)
    @JoinTable(name = "user_role", joinColumns = @JoinColumn(name = "user_id", referencedColumnName = "id"),
            inverseJoinColumns = @JoinColumn(name = "role_id", referencedColumnName = "id"))
    private Set<Role> roles;

    public Integer getId() {
        return id;
    }

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

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getEmail() {
        return email;
    }

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

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

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

    @Transient
    public String getPasswordConfirm() {
        return passwordConfirm;
    }

    public void setPasswordConfirm(String passwordConfirm) {
        this.passwordConfirm = passwordConfirm;
    }

    public Set<Role> getRoles() {
        return roles;
    }

    public void setRoles(Set<Role> roles) {
        this.roles = roles;
    }

}

package hello;

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

@Entity
@Table(name = "role")
public class Role {

    private Long id;
    private String name;

    @ManyToMany(targetEntity = User.class, mappedBy = "roles")
    @Access(AccessType.FIELD)
    private Set<User> users;

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    public Long getId() {
        return id;
    }

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

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Set<User> getUsers() {
        return users;
    }

    public void setUsers(Set<User> users) {
        this.users = users;
    }
}

如果你需要更多的信息,请询问。