Question

我有一个Addon类。删除其实体时，我想将记录保留在数据库中，但将其隐藏在查询中。

通过以下实现，我遇到了一个异常：

@Entity
@SQLDelete(sql = "UPDATE addon SET active IS FALSE WHERE id = ?")
@Where(clause = "active = false")
public class Addon {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private long id;
    @ManyToOne
    private Category category;
    private String name;
    private int amount;
    private int minimalAmount;
    @OneToMany
    private Set<HandOver> handOvers;
    private boolean active;

    public Addon(){
         this.setAmount(0);
         this.active = true;
    }

    @PreRemove
    public void deleteAddon() {
        this.setActive(false);
    }
}

删除方法：

private void deleteAddon(){
        Addon toBeDeleted = chooseAddon();

        Session s = MainController.getSession();
        try {
            s.beginTransaction();
            s.remove(toBeDeleted);
            s.getTransaction().commit();
        } catch (Exception e) {
            s.getTransaction().rollback();
            System.err.println("An error occured. Addon has not been deleted: " + e);
        }
    }

例外：

Led 17, 2019 3:45:44 ODP. org.hibernate.engine.jdbc.spi.SqlExceptionHelper logExceptions
WARN: SQL Error: 1064, SQLState: 42000
Led 17, 2019 3:45:44 ODP. org.hibernate.engine.jdbc.spi.SqlExceptionHelper logExceptions
ERROR: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'IS FALSE WHERE id = 3' at line 1
Led 17, 2019 3:45:44 ODP. org.hibernate.engine.jdbc.batch.internal.AbstractBatchImpl release
INFO: HHH000010: On release of batch it still contained JDBC statements
Led 17, 2019 3:45:44 ODP. org.hibernate.internal.ExceptionMapperStandardImpl mapManagedFlushFailure
ERROR: HHH000346: Error during managed flush [org.hibernate.exception.SQLGrammarException: could not execute statement]

An error occured. Addon has not been deleted: javax.persistence.PersistenceException: org.hibernate.exception.SQLGrammarException: could not execute statement

查询（在hibernate配置中为“ show_sql” = true）为：

Hibernate: delete from Addon_HandOver where Addon_id=?
Hibernate: UPDATE addon SET active IS FALSE WHERE id = ?

我正在使用Hibernate 5和MySQL 8。

Answer 1

尝试这样写：@Where（clause =“ active ='false'”），或者如果active = true表示可见记录，则为true。

软删除实现休眠

1 个答案: