Question

使用下面的两个来存储更新和创建时间。

@CreationTimestamp
private Timestamp creationTime;

@UpdateTimestamp
private Timestamp updationTime;

当我创建新记录时，这两个记录均存储在UTC时区中。

+------------+----------------------------------+--------------+--------------+--------------------+--------------------+-----------------------+---------------------------+------+-------------------+---------------------+------------+------------+---------------------+---------------------+----------+
| meeting_id | analysis_description             | meeting_date | preread_date | first_version_date | reminder_sent_date | review_addressed_date | review_comments_addressed | tfls | first_record_flag | current_record_flag | created_by | updated_by | creation_time       | updation_time       | end_time |
+------------+----------------------------------+--------------+--------------+--------------------+--------------------+-----------------------+---------------------------+------+-------------------+---------------------+------------+------------+---------------------+---------------------+----------+
|          4 | BAF312A2122 - CRT 1 - LEGACY CRT | NULL         | NULL         | NULL               | NULL               | NULL                  | NULL                      |    0 | Y                 | Y                   | NULL       | NULL       | 2019-10-04 06:36:36 | 2019-10-04 06:36:36 | NULL     |
+------------+----------------------------------+--------------+--------------+--------------------+--------------------+-----------------------+---------------------------+------+-------------------+---------------------+------------+------------+---------------------+---------------------+----------+
1 row in set (0.00 sec)

但是，如果我更新记录，则创建时间戳会更改为我的本地时间戳。

+------------+----------------------------------+--------------+--------------+--------------------+--------------------+-----------------------+---------------------------+------+-------------------+---------------------+------------+------------+---------------------+---------------------+----------+
| meeting_id | analysis_description             | meeting_date | preread_date | first_version_date | reminder_sent_date | review_addressed_date | review_comments_addressed | tfls | first_record_flag | current_record_flag | created_by | updated_by | creation_time       | updation_time       | end_time |
+------------+----------------------------------+--------------+--------------+--------------------+--------------------+-----------------------+---------------------------+------+-------------------+---------------------+------------+------------+---------------------+---------------------+----------+
|          4 | BAF312A2122 - CRT 1 - LEGACY CRT | 2019-09-30   | 2019-09-30   | 2019-09-30         | 2019-09-30         | 2019-09-30            | yes                       |    1 | Y                 | Y                   | NULL       | NULL       | 2019-10-04 12:08:20 | 2019-10-04 06:38:20 | NULL     |
+------------+----------------------------------+--------------+--------------+--------------------+--------------------+-----------------------+---------------------------+------+-------------------+---------------------+------------+------------+---------------------+---------------------+----------+
1 row in set (0.00 sec)

两者都将得到更新，而不仅仅是更新时间。

我尝试了各种配置更改，但是它们的行为都相同。

spring.jpa.properties.hibernate.jdbc.time_zone=UTC

使用帖子构造

@SpringBootApplication
public class IdotApplication {

@PostConstruct
void started() {
    TimeZone.setDefault(TimeZone.getTimeZone("UTC"));
}

public static void main(String[] args) {
    SpringApplication.run(IdotApplication.class, args);
}

}

日期而不是时区

@CreationTimestamp 私人Date creationTime;
@CreationTimestamp @Temporal（TemporalType.TIMESTAMP）私人Date creationTime;
@Column（updatable = false） @CreationTimestamp 私人Date creationTime;

serverTimezone=UTC和useLegacyDatetimeCode=false一起已经定义

spring.datasource.url=jdbc:mysql://localhost:3306/rmcdb?useUnicode=true&useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=false&serverTimezone=UTC

Answer 1

该问题是由于mysql的一项功能引起的，我将mysql 5.7+，liquibase与原始sql一起用于架构生成。

如果我使用timestamp在mysql中创建一列，它将自动更新。

mysql> create table test ( a timestamp );
Query OK, 0 rows affected (0.02 sec)

mysql> describe test;
+-------+-----------+------+-----+-------------------+-----------------------------+
| Field | Type      | Null | Key | Default           | Extra                       |
+-------+-----------+------+-----+-------------------+-----------------------------+
| a     | timestamp | NO   |     | CURRENT_TIMESTAMP | on update CURRENT_TIMESTAMP |
+-------+-----------+------+-----+-------------------+-----------------------------+
1 row in set (0.00 sec)

mysql>

创建新记录时，两个时间戳都在UTC时区中，因为hibernate覆盖了mysql。

但是，当记录从on update current_timestamp mysql更新时，hibernate不会执行任何操作，因为它是@creationTimeStamp，因此它保留在{{1} }已放置。

要解决，我将该字段定义为

mysql

现在creation_time timestamp null, updation_time timestamp null不会干扰，更新等。所有操作都只能通过休眠来完成。

如果您发现解释有些混乱，并且正在使用mysql，请仔细阅读下面的文章，以进行澄清。 https://dev.mysql.com/doc/refman/5.7/en/timestamp-initialization.html

希望它对某人有帮助。

在不同的时区休眠@CreationTimestamp @UpdateTimestamp

1 个答案: