How map a bit type in Mysql to hibernate?

问题

i use the reverse engeneering in my class and get this:

@Entity
@Table(name = "user", catalog = "bytecode", uniqueConstraints =
@UniqueConstraint(columnNames = "email"))
public class User implements java.io.Serializable {

    private Integer id;
    private String email;
    private String password;
    private boolean type;

Database:

CREATE TABLE  `bytecode`.`user` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `email` varchar(255) NOT NULL,
  `password` varchar(255) NOT NULL,
  `type` bit(1) NOT NULL,
  PRIMARY KEY (`id`),
  UNIQUE KEY `email` (`email`)
) ENGINE=MyISAM AUTO_INCREMENT=2 DEFAULT CHARSET=latin1;

But i don't want to set 'true' or 'false' in my attribute 'type' but 1 or 0. How can i do that in hibernate ?

Best regards, Valter Henrique.

回答1:

Hibernate has a special numeric_boolean type for this kind of mapping. You can configure it as follows:

@Type(type = "numeric_boolean")
private boolean type;

See also:

6.1.1. Basic value types

回答2:

Do you have to have it as a bit type in MySQL? The easiest solution would be to change the data type in MySQL to tinyint(1).

~~Otherwise you should be able to map your entity type to an integer using annotations;~~ Not sure about this, have to look it up

...
@Column(nullable=false)
@Type(type="org.hibernate.type.BooleanType")
private short type;

回答3:

I had a similar problem. The following mapping in Java solved my problem:

@Column(name = "columnName", columnDefinition="BIT")
private Boolean columnVariable;

回答4:

http://bugs.mysql.com/bug.php?id=28422 suggests it is a bug. http://www.xaprb.com/blog/2006/04/11/bit-values-in-mysql/ suggests it would be wise to skip it. But of course you can't tell the DBA to not use a bit column in MySQL - meaning either we need to use and older version of MySQL (< 5.0.3) or not use MySQL's bit + Hibernate at all.

来源：https://stackoverflow.com/questions/5567322/how-map-a-bit-type-in-mysql-to-hibernate

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