無法解析屬性：product_id of：評論

在服務器啓動時發生錯誤，查詢可查找用戶發佈的有關特定產品的所有評論。無法解析屬性：product_id of：評論

引起：java.lang.IllegalArgumentException：org.hibernate.QueryException：無法解析屬性：product_id：haughton.dvdstore.model.Comment [從haughton.dvdstore.model.Comment中選擇c c其中c.product_id =：ID]

回購類

@Repository 
public interface CommentDao extends CrudRepository<Comment,Long> { 
@Query("select c from Comment c where c.product_id = :id") 
List<Comment> allCommentsByProductId(@Param("id") Long id); 
}

Comment類

@Entity 
public class Comment { 
@Id 
@GeneratedValue(strategy = GenerationType.IDENTITY) 
private Long id; 

@ManyToOne 
@JoinColumn(name = "product_id") 
private Product product; 

@ManyToOne 
@JoinColumn(name = "user_id") 
private User user; 

private String text; 

public Long getId() { 
    return id; 
} 

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

public Product getProduct() { 
    return product; 
} 

public void setProduct(Product product) { 
    this.product = product; 
} 

public User getUser() { 
    return user; 
} 

public void setUser(User user) { 
    this.user = user; 
} 

public String getText() { 
    return text; 
} 

public void setText(String text) { 
    this.text = text; 
} 
}

我的產品類

@Entity 
public class Product { 
@Id 
@GeneratedValue(strategy = GenerationType.IDENTITY) 
private Long id; 

private String title; 
private String description; 
private int quantityInStock; 
Date date; 
private double price; 

public Long getId() { 
    return id; 
} 

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

public String getTitle() { 
    return title; 
} 

public void setTitle(String title) { 
    this.title = title; 
} 

public String getDescription() { 
    return description; 
} 

public void setDescription(String description) { 
    this.description = description; 
} 

public int getQuantityInStock() { 
    return quantityInStock; 
} 

public void setQuantityInStock(int quantityInStock) { 
    this.quantityInStock = quantityInStock; 
} 

public Date getDate() { 
    return date; 
} 

public void setDate(Date date) { 
    this.date = date; 
} 

public double getPrice() { 
    return price; 
} 

public void setPrice(double price) { 
    this.price = price; 
} 
}

用戶類

@Entity 
public class User implements UserDetails { 
@Id 
@GeneratedValue(strategy = GenerationType.IDENTITY) 
private Long id; 

@Column(unique = true) 
@Size(min = 8, max = 20) 
private String username; 

@Column(length = 100) 
private String password; 

@Column(nullable = false) 
private boolean enabled; 

@OneToOne 
@JoinColumn(name = "role_id") 
private Role role; 

@Override 
public Collection<? extends GrantedAuthority> getAuthorities() { 
    List<GrantedAuthority> authorities = new ArrayList<>(); 
    authorities.add(new SimpleGrantedAuthority(role.getName())); 
    return authorities; 
} 

public Long getId() { 
    return id; 
} 

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

@Override 
public String getPassword() { 
    return password; 
} 

@Override 
public String getUsername() { 
    return username; 
} 

@Override 
public boolean isAccountNonExpired() { 
    return true; 
} 

@Override 
public boolean isAccountNonLocked() { 
    return true; 
} 

@Override 
public boolean isCredentialsNonExpired() { 
    return true; 
} 

@Override 
public boolean isEnabled() { 
    return enabled; 
} 
public static PasswordEncoder getPasswordEncoder() { 
    return PASSWORD_ENCODER; 
} 
}

來源

2017-04-04 Daniel

它應該已經@Query（「選擇從評論C C其中c.product.id =：ID」）

來源

2017-04-04 18:53:10 Daniel

無法解析屬性：product_id of：評論

回答

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