我的MySQL数据库中有一个表，其中有一个日期列：

+-------------------+---------------+------+-----+---------+----------------+

| Field | Type | Null | Key | Default | Extra |

+-------------------+---------------+------+-----+---------+----------------+

| id | bigint(20) | NO | PRI | NULL | auto_increment |

| type | varchar(50) | NO | | NULL | |

| expiration | date | NO | | NULL | |

我正在将MySQL与JPA一起使用以保存日期。我有一个功能，用户可以选择最终日期范围，它将获得所有日期。

查看此代码(带有一堆SYSO)以尝试查看发生了什么…

@Override

protected DateTime nextReference(DateTime reference) {

System.out.println("Reference: " + reference.toString("dd-MM-YYYY"));

DateTime plus = reference.plusMonths(1);

System.out.println("One month from now: " + plus.toString("dd-MM-YYYY"));

DateTime result = plus.withDayOfMonth(reference.getDayOfMonth());

System.out.println("Final: " + result.toString("dd-MM-YYYY"));

return result;

}

这部分，结果很好：

Reference: 10-01-2017

One month from now: 10-02-2017

Final: 10-02-2017

Reference: 10-02-2017

One month from now: 10-03-2017

Final: 10-03-2017

Reference: 10-03-2017

One month from now: 10-04-2017

Final: 10-04-2017

Reference: 10-04-2017

One month from now: 10-05-2017

Final: 10-05-2017

Reference: 10-05-2017

One month from now: 10-06-2017

Final: 10-06-2017

Reference: 10-06-2017

One month from now: 10-07-2017

Final: 10-07-2017

Reference: 10-07-2017

One month from now: 10-08-2017

Final: 10-08-2017

Reference: 10-08-2017

One month from now: 10-09-2017

Final: 10-09-2017

Reference: 10-09-2017

One month from now: 10-10-2017

Final: 10-10-2017

Reference: 10-10-2017

One month from now: 10-11-2017

Final: 10-11-2017

Reference: 10-11-2017

One month from now: 10-12-2017

Final: 10-12-2017

Reference: 10-12-2017

One month from now: 10-01-2018

Final: 10-01-2018

好的，现在让我们转到保存部分：

@Transactional

private void saveTransactions(List transactions) {

for (Transaction t : transactions) {

System.out.println("Saving: " + t.getExpiration().toString("dd-MM-YYYY"));

Transaction saved = dao.save(t);

System.out.println("Saved: " + saved.getExpiration().toString("dd-MM-YYYY"));

}

}

如您所见，我还添加了一些行来调试它。…在继续输出之前，请检查DAO：

public T save(T entity) {

entityManager.persist(entity);

return entity;

}

没什么大不了的…输出：

Saving: 10-02-2017

Saved: 10-02-2017

Saving: 10-03-2017

Saved: 10-03-2017

Saving: 10-04-2017

Saved: 10-04-2017

Saving: 10-05-2017

Saved: 10-05-2017

Saving: 10-06-2017

Saved: 10-06-2017

Saving: 10-07-2017

Saved: 10-07-2017

Saving: 10-08-2017

Saved: 10-08-2017

Saving: 10-09-2017

Saved: 10-09-2017

Saving: 10-10-2017

Saved: 10-10-2017

Saving: 10-11-2017

Saved: 10-11-2017

Saving: 10-12-2017

Saved: 10-12-2017

如您所见…应该没事吧？一切都在十号。

在我再次继续之前，请检查模型和转换器：

//Attribute

@Convert(converter = JpaDateConverter.class)

private DateTime expiration;

//Converter

public class JpaDateConverter implements AttributeConverter {

@Override

public Date convertToDatabaseColumn(DateTime objectValue) {

return objectValue == null ? null : new Date(objectValue.getMillis());

}

@Override

public DateTime convertToEntityAttribute(Date dataValue) {

return dataValue == null ? null : new DateTime(dataValue);

}

}

现在查看我的数据库：

mysql> select expiration from tb_transaction where notes = 3 and year(expiration

) = 2017;

+------------+

| expiration |

+------------+

| 2017-01-10 |

| 2017-02-10 |

| 2017-03-09 |

| 2017-04-09 |

| 2017-05-09 |

| 2017-06-09 |

| 2017-07-09 |

| 2017-08-09 |

| 2017-09-09 |

| 2017-10-09 |

| 2017-11-10 |

| 2017-12-10 |

+------------+

12 rows in set (0.00 sec)

对于某些奇怪的原因，某些日期保存在9号而不是10号！

无警告，MySQL驱动程序无错误或什么都没有。

请帮助大家！

EDIT 交易类别：

@Entity

@Table(name = "tb_transaction")

public class Transaction implements Cloneable {

@Id

@GeneratedValue(strategy = GenerationType.IDENTITY)

private Long id;

@Enumerated(STRING)

private TransactionType type;

@Convert(converter = JpaDateConverter.class)

private DateTime expiration;