MySQL中DATETIME和TIMESTAMP的区别

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MySQL中DATETIME和TIMESTAMP的区别

来源: 作者: 时间:2016-01-28 09:19 【

先Copy一份文档给大家看:DateTimeA date and time combination The supported range is 1000-01-01 00:00:00 to 9999-12-31 23:59:59 MySQL displays DATETIME values in YY

先Copy一份文档给大家看:

DateTime
A date and time combination. The supported range is '1000-01-01 00:00:00' to '9999-12-31 23:59:59'.
MySQL displays DATETIME values in 'YYYY-MM-DD HH:MM:SS' format, but allows you to assign values to DATETIME columns using either strings or numbers.
TimeStamp
A timestamp. The range is '1970-01-01 00:00:00' to partway through the year 2037.
A TIMESTAMP column is useful for recording the date and time of an INSERT or UPDATE operation.
The first TIMESTAMP column in a table is automatically set to the date and time of the most recent operation if you don't assign it a value yourself.
You can also set any TIMESTAMP column to the current date and time by assigning it a NULL value.

现在开始具体比较:

DATETIME,字节数为8,取值范围为“1000-01-01 00:00:00——9999-12-31 23:59:59”

对应类型为java.sql.Timestamp

INSERT或UPDATE操作时不会自动修改其值,不可以设定默认值,为必须字段时必须手动插入,建议使用:new()

MySql按照YYYY-MM-DD HH:MM:SS对数据进行格式化,允许以字符串和数字的方式提交

eg:insert into time_table(CreateDate) values(‘2014-06-09 15:01:01’)

或insert into time_table(CreateDate) values(‘20140609150101’)

TIMESTAMP,字节数为4,取值范围为“19700101080001——20380119111407”

对应Java类型为java.sql.Timestamp

INSERT或UPDATE操作时(且未手动赋值)系统会自动更新、插入当前系统时间,默认值为CURRENT_TIMESTAMP()

提交手动赋值为NULL时也会被赋值为当前系统时间,错误时会填入0

使用TIMESTAMP一定要注意他的时间范围(见上)。

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