MYSQL date

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MySQL Date函数的正确用法
http://database.51cto.com 2010-05-31 11:13 小单单互联网我要评论(0)
摘要：此文章主要向大家描述的是MySQL Date函数的实际应用以及对其实际应用代码的描述，以下就是文章的主要内容描述，望你会有所收获。
标签：MySQL Date函数
限时报名参加“甲骨文全球大会·2010·北京”及“JavaOne和甲骨文开发者大会2010”

以下的文章主要介绍的是MySQL Date函数的实际应用其中包括如何获取当前时间的具体操作，Unix时间的具体应用，时间前后、时间间隔与时间转换的实际内容描述，以下就是文章的主要内容。

MySQL Date函数 1、获取当前时间

MySQL> select current_timestamp(); +---------------------+ | current_timestamp() | +---------------------+ | 2010-01-18 21:24:37 | +---------------------+ 1 row in set (0.00 sec) MySQL> select current_date(); +----------------+ | current_date() | +----------------+ | 2010-01-18 | +----------------+ 1 row in set (0.00 sec) MySQL> select current_time(); +----------------+ | current_time() | +----------------+ | 21:24:46 | +----------------+ 1 row in set (0.00 sec)
MySQL Date函数 2、Unix时间

MySQL> select unix_timestamp(); +------------------+ | unix_timestamp() | +------------------+ | 1263821184 | +------------------+ 1 row in set (0.00 sec) MySQL> select from_unixtime(1263821182); +---------------------------+ | from_unixtime(1263821182) | +---------------------------+ | 2010-01-18 21:26:22 | +---------------------------+ 1 row in set (0.00 sec)
MySQL Date函数 3、时间前后

MySQL> select date_add(current_timestamp, interval 1 day); +---------------------------------------------+ | date_add(current_timestamp, interval 1 day) | +---------------------------------------------+ | 2010-01-19 21:27:53 | +---------------------------------------------+ 1 row in set (0.00 sec) MySQL> select date_add(current_time, interval 1 day); +----------------------------------------+ | date_add(current_time, interval 1 day) | +----------------------------------------+ | NULL | +----------------------------------------+ 1 row in set, 1 warning (0.00 sec) MySQL> select date_add(current_date, interval 1 day); +----------------------------------------+ | date_add(current_date, interval 1 day) | +----------------------------------------+ | 2010-01-19 | +----------------------------------------+ 1 row in set (0.00 sec) MySQL> select date_sub(current_timestamp, interval 1 day); +---------------------------------------------+ | date_sub(current_timestamp, interval 1 day) | +---------------------------------------------+ | 2010-01-17 21:28:41 | +---------------------------------------------+ 1 row in set (0.00 sec) MySQL> select date_sub(current_date, interval 1 day); +----------------------------------------+ | date_sub(current_date, interval 1 day) | +----------------------------------------+ | 2010-01-17 | +----------------------------------------+ 1 row in set (0.00 sec) MySQL> select date_sub(current_time, interval 1 day); +----------------------------------------+ | date_sub(current_time, interval 1 day) | +----------------------------------------+ | NULL | +----------------------------------------+ 1 row in set, 1 warning (0.00 sec)

MySQL Date函数 4、时间间隔

MySQL> select datediff('2010-01-18','2010-01-17'); +-------------------------------------+ | datediff('2010-01-18','2010-01-17') | +-------------------------------------+ | 1 | +-------------------------------------+ 1 row in set (0.00 sec) MySQL> select timediff('2010-01-18 12:00','2010-01-17 11:00'); +-------------------------------------------------+ | timediff('2010-01-18 12:00','2010-01-17 11:00') | +-------------------------------------------------+ | 25:00:00 | +-------------------------------------------------+ 1 row in set (0.00 sec)

MySQL Date函数 5、时间转换

MySQL> select time_to_sec('25:00:00'); +-------------------------+ | time_to_sec('25:00:00') | +-------------------------+ | 90000 | +-------------------------+ 1 row in set (0.00 sec) MySQL> select sec_to_time(90000); +--------------------+ | sec_to_time(90000) | +--------------------+ | 25:00:00 | +--------------------+ 1 row in set (0.00 sec)
以上的相关内容就是对MySQL Date函数的介绍，望你能有所收获。