Question

我有一张内容表。表格结构如下。我想用一些条件更新表。我会尝试更新这个，但我不能为MySQL新手请帮助我..

我的表结构：

Emp_id  Emp_Name  Join_date  confirm_date  resign_date  status   con_status
001     arun      2011-01-12 2012-06-12                   A      confirmed 
002     aruna     2011-02-12 2012-11-12    2012-04-10     D      Not-confirmed
002     aruna     2011-06-12 2012-12-12                   A      Not-confirmed
004     vinos     2011-03-12 2012-10-01                   A      //null value

我希望在日期

时更新con_status

Emp_id  Emp_Name  Join_date  confirm_date  resign_date  status   con_status
001     arun      2011-01-12 2012-06-12                   A      confirmed 
002     aruna     2011-02-12 2012-11-12    2012-04-10     D      Not-confirmed 
002     aruna     2011-06-12 2012-12-12                   A      Not-confirmed
004     vinos     2011-03-12 2012-10-01                   A      confirmed

我的条件是这样的。

if(con_status == null)
{
  if(confirm_date > Datetime.Now)and (status='Active')
  {
    //update con_status as confirmed
  }
}
else if(con_status == Not-confirmed)
{
   if(confirm_date > Datetime.Now)and (status='Active')
  {
    //update con_status as confirmed
  }
  else
  {
    maintain the previous status
  }

}

Answer 1

UPDATE my_table 
SET con_status = 'confirmed' 
WHERE status = 'Active' AND NOW() < confirm_date AND (con_status IS NULL OR con_status = 'Not-confirmed')

Answer 2

update table
set con_status='confirmed'
where
status='Active' and now()<confirm_date and  con_status is null

update table
set con_status='confirmed'
where
status='Active' and now()<confirm_date and  con_status ='Not-confirmed'

具有条件的Mysql更新查询

2 个答案: