在我的带有spring-data-jpa的spring Boot 框架中
当我使用javax.persistence.EntityManager进行INSERT或UPDATE时，MySQL数据库插入不需要毫秒。
在我的Sping Boot 框架中，我使用
spring-data-jpa 2.7.11
mysql-connector-j 8.0.33
hibernate-core 5.6.15.Final

javax.persistence.EntityManager entityManager;
entityManager.persist(myEntityItem);

我测试了Table的列DATETIME（3）和DATETIME（6）

MySQL表：

我尝试使用java.util.Date、java.util.Calendar和java. time. LocalDateTime。
我还尝试在实体类的参数上使用@CreationTimestamp注解，并手动设置每个参数的值。
每一次，我都会得到包含毫秒的TRACE级别日志。

Hibernate: 
    insert 
    into
        DREAM_TEST.time_table
        (calendar3, calendar6, java_util_date3, java_util_date6, local_date_time3, local_date_time6, text) 
    values
        (?, ?, ?, ?, ?, ?, ?)
2023-05-17 10:02:27.685 TRACE 31760 --- [           main] o.h.type.descriptor.sql.BasicBinder      : binding parameter [1] as [TIMESTAMP] - [java.util.GregorianCalendar[time=1684285347672,areFieldsSet=true,areAllFieldsSet=true,lenient=true,zone=sun.util.calendar.ZoneInfo[id="Asia/Seoul",offset=32400000,dstSavings=0,useDaylight=false,transitions=30,lastRule=null],firstDayOfWeek=1,minimalDaysInFirstWeek=1,ERA=1,YEAR=2023,MONTH=4,WEEK_OF_YEAR=20,WEEK_OF_MONTH=3,DAY_OF_MONTH=17,DAY_OF_YEAR=137,DAY_OF_WEEK=4,DAY_OF_WEEK_IN_MONTH=3,AM_PM=0,HOUR=10,HOUR_OF_DAY=10,MINUTE=2,SECOND=27,MILLISECOND=672,ZONE_OFFSET=32400000,DST_OFFSET=0]]
2023-05-17 10:02:27.685 TRACE 31760 --- [           main] o.h.type.descriptor.sql.BasicBinder      : binding parameter [2] as [TIMESTAMP] - [java.util.GregorianCalendar[time=1684285347672,areFieldsSet=true,areAllFieldsSet=true,lenient=true,zone=sun.util.calendar.ZoneInfo[id="Asia/Seoul",offset=32400000,dstSavings=0,useDaylight=false,transitions=30,lastRule=null],firstDayOfWeek=1,minimalDaysInFirstWeek=1,ERA=1,YEAR=2023,MONTH=4,WEEK_OF_YEAR=20,WEEK_OF_MONTH=3,DAY_OF_MONTH=17,DAY_OF_YEAR=137,DAY_OF_WEEK=4,DAY_OF_WEEK_IN_MONTH=3,AM_PM=0,HOUR=10,HOUR_OF_DAY=10,MINUTE=2,SECOND=27,MILLISECOND=672,ZONE_OFFSET=32400000,DST_OFFSET=0]]
2023-05-17 10:02:27.685 TRACE 31760 --- [           main] o.h.type.descriptor.sql.BasicBinder      : binding parameter [3] as [TIMESTAMP] - [2023-05-17 10:02:27.6725819]
2023-05-17 10:02:27.685 TRACE 31760 --- [           main] o.h.type.descriptor.sql.BasicBinder      : binding parameter [4] as [TIMESTAMP] - [2023-05-17 10:02:27.6725819]
2023-05-17 10:02:27.685 TRACE 31760 --- [           main] o.h.type.descriptor.sql.BasicBinder      : binding parameter [5] as [TIMESTAMP] - [2023-05-17T10:02:27.672581900]
2023-05-17 10:02:27.686 TRACE 31760 --- [           main] o.h.type.descriptor.sql.BasicBinder      : binding parameter [6] as [TIMESTAMP] - [2023-05-17T10:02:27.672581900]
2023-05-17 10:02:27.686 TRACE 31760 --- [           main] o.h.type.descriptor.sql.BasicBinder      : binding parameter [7] as [VARCHAR] - [with values set]
2023-05-17 10:02:27.691  INFO 31760 --- [           main] p6spy                                    : #1684285347691 | took 2ms | statement | connection 9| url jdbc:mysql://dreamtest.db:4306/DREAM_TEST
insert into DREAM_TEST.time_table (calendar3, calendar6, java_util_date3, java_util_date6, local_date_time3, local_date_time6, text) values (?, ?, ?, ?, ?, ?, ?)
insert into DREAM_TEST.time_table (calendar3, calendar6, java_util_date3, java_util_date6, local_date_time3, local_date_time6, text) values ('2023-05-17T10:02:27.672+0900', '2023-05-17T10:02:27.672+0900', '2023-05-17T10:02:27.672+0900', '2023-05-17T10:02:27.672+0900', '2023-05-17T10:02:27.672+0900', '2023-05-17T10:02:27.672+0900', 'with values set');

但在我的数据库中，所有的毫秒都被删除了

结果表：