Question

我的实体名为Post，其中Id为主键。

@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name = "Id", unique = true, nullable = false)
public Integer getId() {
    return Id;
}

public void setId(Integer id) {
    Id = id;
}

在上面的代码中，您可能会看到GenerationType.IDENTITY，如果创建新Post，我会假设负责生成新ID。

但是，当我使用HTTP POST：

制作JSON时

{"id":0,"title":"test","viewCount":0,"body":"test","tags":"","answerCount":0,"commentCount":0,"postTypeId":1,"favoriteCount":0,"creationDate":"Nov 25, 2015 11:43:22 AM","acceptedAnswerId":0,"lastEditorUserId":0,"score":0}

我收到此错误：

 SEVERE: Servlet.service() for servlet [rest] in context with path [/StackExchange] threw exception [Request processing failed; nested exception is org.springframework.orm.jpa.JpaSystemException: could not execute statement; nested exception is org.hibernate.exception.GenericJDBCException: could not execute statement] with root cause
java.sql.SQLException: Field 'Id' doesn't have a default value

我还没有设置AI，也许这就是原因。但我无法改变这张桌子。表中的数据来自SQL转储，我无法更改它以将Id设置为AutoIncrement

Id的Hibernate自动生成似乎并没有起作用

0 个答案: