org.postgresql.util.PSQLException:错误:类型字符变化的值太长(255)

Question

我明白了 error

当executing我project和我不知道为什么.

目标是通过使用save Json文本到文本.databasehibernate

Users.java和UsersBooks.java同样是,

Books.java:

@Entity
@Table(name="tblbooks")
public class Books {


@Id
@Column(name = "bookshareId")
private int bookshareId;

@Column(name="author")
private String author;

@Column(name = "availableToDownload")
private int availableToDownload;

@Column(name = "briefSynopsis")
private String briefSynopsis;

@Column(name="category")
private String category;

@Column(name = "completeSynopsis")
private String completeSynopsis;

@Column(name = "contentId")
private int contentId;

@Column(name = "copyright")
private Date copyright;

@Column(name="downloadFormat")
private String downloadFormat;

@Column(name="dtbookSize")
private int dtbookSize;

@Column(name = "freelyAvailable")
private int freelyAvailable;

@Column(name = "brf")
private int brf;

@Column(name = "daisy")
private int daisy;

@Column(name = "images")
private int images;

@Column(name = "isbn13")
private String isbn13;

@Column(name="language")
private String language;

@Column(name = "publishDate")
private Date publishDate;

@Column(name = "publisher")
private String publisher;

@Column(name = "quality")
private String quality;

@Column(name = "title")
private String title;

@OneToMany(mappedBy="book")
private List<UsersBooks> usersBooks;



//Getters & Setters

Answer 1

您尝试保存超过255个字符长度的字符串值.只需增加列长度即可

@Column(name = "xxx", length = 1024)

您还需要更改数据库中的列长度.

当你使用

@Column(name = "xxx")

Hibernate使用默认列长度.

您可以使用@Lob非常大的文本数据.

请用xxx_users,代替tblusers.

用来User代替Users.

使用协会CascadeType.ALL的@OneToMany一部分.

@ManyToOne在关联部分使用延迟加载.

@ManyToOne(fetch = FetchType.Lazy)
pravate User user;

Answer 2

对于长度超过 255 个字符的字符串，您可以增加列长度：

@Column(length = 2048)
private String column;

对于大尺寸：

@Lob
private String column;

对于无限大小：

@Column(columnDefinition="text")
private String column;