Mysql 中的时间

1. select from_unixtime(1297426454); --> 2011-02-11 20:14:14
2. select date_format(from_unixtime(1297426454),'%Y-%m-%d %H:%i'); --> 2011-02-11 20:14

2012.02.24
  1. 数据库连接池, validationQuery http://confluence.atlassian.com/display/JIRA/Surviving+Connection+Closures
  MySQL select 1
  Microsoft SQL Server select 1
  Oracle select 1 from dual
  PostgreSQL  select version();