Question

当我尝试在Contact类中的电话上映射电话时，它会出现以下错误：

SessionFactory对象的初始创建失败。错误：org.hibernate.MappingException：无法确定以下类型：com.livro.capitulo3.crudannotations.Telephone，在表：contact，对于列：[org.hibernate.mapping.Column（numPhone）] 关闭插入操作时出错。消息：null java.lang.ExceptionInInitializerError 映射类如下：

//类Contato

package com.livro.capitulo3.crudannotations;

import java.sql.Date;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.ManyToOne;
import javax.persistence.OneToMany;
import javax.persistence.Table;

import org.hibernate.annotations.ManyToAny;

@Entity
@Table(name = "contato")
public class ContatoAnnotations {

    @Id
    @GeneratedValue
    @Column(name = "codigo")
    private Integer codigo;

    @Column(name = "nome", length = 50, nullable = true)
    private String  nome;

    @Column(name = "telefone", length = 50, nullable = true)
    private String  telefone;

    @Column(name = "email", length = 50, nullable = true)
    private String  email;

    @Column(name = "dt_cad", nullable = true)
    private Date        dataCadastro;

    @Column(name = "obs", nullable = true)
    private String  observacao;


    //Como ficaria a annotation aqui???? Só vou persistir esta tabela
    @OneToMany
    private Telefone numTelefone;
    ...
    //Getters e Setters

}

//班级电话：

package com.livro.capitulo3.crudannotations;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.ManyToOne;
import javax.persistence.OneToMany;
import javax.persistence.Table;

@Entity
@Table(name = "contato")
public class Telefone {
    @Id
    @GeneratedValue
    @Column(name = "numero")
    private String numero;
    @Column(name = "tipo")
    private String tipo;

    public String getNumero() {
        return numero;
    }

    public void setNumero(String numero) {
        this.numero = numero;
    }

    public String getTipo() {
        return tipo;
    }

    public void setTipo(String tipo) {
        this.tipo = tipo;
    }

}

我不知道如何做这个映射。救命！感谢!!!

Answer 1

如果您使用@OneToMany注释，则应该是List或Set之类的集合：

@OneToMany(cascade = CascadeType.ALL, mappedBy = "contacto")
private List<Telefone> numTelefone = new ArrayList<>();

同时更改Telephone实体的表名称，它必须与contacto不同：

@Entity
@Table(name = "tel")
public class Telefone {...}

Answer 2

因为您没有正确映射它。有几种方法可以做到：https://en.m.wikibooks.org/wiki/Java_Persistence/OneToMany

如何使用hibernate映射类属性？

2 个答案: