问题描述

jpa配置@ManyToOne和@OneToMany

@Entity
@Table(name = "ba_user", catalog = "GONGYOU")
public class User implements java.io.Serializable{
private String userId;//主键

@Id
@GeneratedValue(generator = "UIDGenerator")
@GenericGenerator(name = "UIDGenerator", strategy = "uuid")
@Column(length = 32,name="userId",nullable=false)
public String getUserId() {
    return userId;
}
public void setUserId(String userId) {
    this.userId = userId;
}
    private Set<UserPost> userPosts = new HashSet<UserPost>();

@OneToMany(cascade = { CascadeType.PERSIST, CascadeType.REFRESH,
        CascadeType.REMOVE }, fetch = FetchType.EAGER, mappedBy = "user")
public Set<UserPost> getUserPosts() {
    return userPosts;
}
public void setUserPosts(Set<UserPost> userPosts) {
    this.userPosts = userPosts;
}

}

第二张表：
@Entity
@Table(name = "gy_user_post", catalog = "GONGYOU")
public class UserPost implements java.io.Serializable{
private String id;
private String userId;
private User user;

@Id
@GeneratedValue(generator = "UIDGenerator")
@GenericGenerator(name = "UIDGenerator", strategy = "uuid")
@Column(length = 32,name="id",nullable=false)
public String getId() {
    return id;
}
public void setId(String id) {
    this.id = id;
}

@Column(length = 32, name = "user_id",insertable = false, updatable = false)
public String getUserId() {
    return userId;
}
public void setUserId(String userId) {
    this.userId = userId;
}

@ManyToOne(cascade = {CascadeType.ALL,CascadeType.REFRESH }, optional = true)
@JoinColumn(name = "user_id",referencedColumnName="USERID")
public User getUser() {
    return user;
}

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

}

双向关联，报错信息为:the table gy_user_post cannot be found on the database

解决方案

没看出来哪里有问题，怎么会表格找不到呢？clean以后重新试试
把错误截图看看

解决方案二：

这个报错是类编译错误过不去。。。

解决方案三：

把错误截图传上来看看

解决方案四：

呵呵，好吧，以后就不会犯这个错误了。加深印象。