SELECT
tm as tm,
servername as server,
apu as apu,
lpu as lpu,
pcu as pcu
FROM
table
WHERE
servername=#server#
<isNotEmpty property="tm">
AND year(tm)=year(#tm#)
AND month(tm)=month(#tm#)
</isNotEmpty>
如果servername='DB'的时候,加入条件tm>='2011-10-10'这样的条件
如果不是,就直接执行上面那句sql...
参考一下这个贴子的提问方式http://topic.csdn.net/u/20091130/20/8343ee6a-417c-4c2d-9415-fa46604a00cf.html
1. 你的 create table xxx .. 语句
2. 你的 insert into xxx ... 语句
3. 结果是什么样,(并给以简单的算法描述)
4. 你用的数据库名称和版本(经常有人在MS SQL server版问 MySQL)
这样想帮你的人可以直接搭建和你相同的环境,并在给出方案前进行测试,避免文字描述理解上的误差。
我想对一个表进行查找
但是针对某个数据不想让人知道
比如servername=DB的2011-10-10以后的数据,不想被查询出来原来的Sql语句就是SELECT
tm as tm,
servername as server,
apu as apu,
lpu as lpu,
pcu as pcu
FROM
table
WHERE
servername=#server#
<isNotEmpty property="tm">
AND year(tm)=year(#tm#)
AND month(tm)=month(#tm#)
</isNotEmpty>
这样的但是当查询的条件为servername='DB' 的时候,让tm>=2011-10-10这个条件自动加入就是想问有没有类似isNotEmpty 这个类似方法的东西
tm as tm,
servername as server,
apu as apu,
lpu as lpu,
pcu as pcu
FROM
table
WHERE
servername=#server#
<isNotEmpty property="tm">
AND year(tm)=year(#tm#)
AND month(tm)=month(#tm#)
</isNotEmpty>
and (#server# != 'DB' or tm>='2011-10-10')
tm as tm,
servername as server,
apu as apu,
lpu as lpu,
pcu as pcu
FROM
table
WHERE
servername=#server#
<isNotEmpty property="tm">
AND year(tm)=year(#tm#)
AND month(tm)=month(#tm#)
</isNotEmpty>
and (#server# != 'DB' or tm<'2011-10-10')