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

I get this error

我得到这个错误

when executing my project and I don't know why.

当执行我的项目时，我不知道为什么。

The goal is to save Json text into a database by using hibernate.

目标是使用hibernate将Json文本保存到数据库中。

Users.java & UsersBooks.java is likewise,

用户。java & UsersBooks。java是同样的,

Books.java:

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

3 个解决方案

#1

You try to save a string value more than 255 chars length. Just increase a column length

尝试保存超过255个字符长度的字符串值。只要增加一列的长度

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

you need to alter a column length in the database too.

您还需要修改数据库中的列长度。

When you use

当你使用

@Column(name = "xxx")

Hibernate uses a default column length.

Hibernate使用默认的列长度。

You can use @Lob for a really large text data.

您可以将@Lob用于一个非常大的文本数据。

Please, use xxx_users in place of tblusers.

请使用xxx_users代替tblusers。

Use User in place of Users.

使用用户代替用户。

Use CascadeType.ALL on the @OneToMany part of the association.

使用CascadeType。所有关于协会的@OneToMany部分。

Use a lazy loading on the @ManyToOne part of the association.

对关联的@ManyToOne部分使用延迟加载。

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

#2

The error message tells that you are trying to store a String which is too large for its destination column (255).

错误消息告诉您正在尝试存储一个字符串，该字符串对于其目标列(255)来说太大。

You can either :

你可以:

Increase the column size or
增加列大小或
Change the column type to TEXT instead of VARCHAR(255).
将列类型改为文本，而不是VARCHAR(255)。

#3

For String with more than 255 chars length you can increase column length :

对于长度超过255字符的字符串，可以增加列长度:

@Column(length = 2048)
private String column;

For large size :

对于大尺寸:

@Lob
private String column;

For unlimited size :

无限的规模:

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

#1