mysql+mssql+oracle的时间日期类型
1: sql server 日期类型: 为 'YYYY-MM-DD HH:MM:SS 2. mysql 日期和时间类型: DATE ,日期。支持的范围为 '1000-01-01' 到 '9999-12-31' 。 MySQL 以 'YYYY-MM-DD' 式显示 DATE DATETIME ,日期和时间的组合。支持的范围是 '1000-01-01 00:00:00' 到 '9999
1: sql server 日期类型:
为'YYYY-MM-DD HH:MM:SS
2. mysql日期和时间类型:
DATE,日期。支持的范围为'1000-01-01'到'9999-12-31'。MySQL以'YYYY-MM-DD'格式显示DATE值
DATETIME,日期和时间的组合。支持的范围是'1000-01-01
00:00:00'到'9999-12-31 23:59:59'。MySQL以'YYYY-MM-DD
HH:MM:SS'格式显示DATETIME值
TIMESTAMP[(M)],时间戳。TIMESTAMP值返回后显示为'YYYY-MM-DD
HH:MM:SS'格式的字符串,显示宽度固定为19个字符。
TIME,时间。范围是'-838:59:59'到'838:59:59'。MySQL以'HH:MM:SS'格式显示TIME值
YEAR[(2|4)],两位或四位格式的年。默认是四位格式。在四位格式中,允许的值是1901到2155和0000。在两位格式中,允许的值是70到69,表示从1970年到2069年。MySQL以YYYY 格式显示YEAR值
3:JAVA默认的日期时间格式为
Thu Jul 07 17:05:39 CST 2005
如果想转化为2005-07-05 的格式,则需要使用类 SimpleDateFormat
SimpleDateFormat formatt= new SimpleDateFormat("yyyy-MM-dd") ;
Date date =new Date();
System.out.println(formatt.format(date));
则打印出的格式为:2005-07-07
SimpleDateFormat formatt= new SimpleDateFormat("yyyy-MMMM-dd") ;
Date date =new Date();
System.out.println(formatt.format(date));
则打印出的格式为:2005-七月-07
---------------------------
4:Oracle的默认日期格式
SQL> select sysdate from dual ;
SYSDATE
----------
07-7月-05
用to_char转化为yyyy-mm-dd的格式
SQL> select to_char(sysdate,'yyyy-mm-dd') Time from dual ;
TIME
----------
2005-07-07
在Oracle里有两个与date相关的函数 to_date()和to_char() ;
to_date() 作用将字符类型按一定格式转化为日期类型:
具体用法:to_date('2004-11-27','yyyy-mm-dd'),前者为字符串,后者为转换日期格式,注意,前后两者要以一对应。
如;to_date('2004-11-27 13:34:43', 'yyyy-mm-dd hh24:mi:ss') 将得到具体的时间
to_date() 作用将字符类型按一定格式转化为日期类型:
具体用法:to_date('2004-11-27','yyyy-mm-dd'),前者为字符串,后者为转换日期格式,注意,前后两者要以一对应。
如;to_date('2004-11-27 13:34:43', 'yyyy-mm-dd hh24:mi:ss') 将得到具体的时间.
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