sql判断语句

方法一：

<if test="null != orderType and 0 == orderType">

order by amountTimes desc

</if>

<if test="null != orderType and 1 == orderType">

order by amountTimes asc

</if>

<if test="null != orderType and 2 == orderType">

order by amountUsedTime desc

</if>

<if test="null != orderType and 3 == orderType">

order by amountUsedTime asc

</if>

<if test="null != orderType and 4 == orderType">

order by amountUsedTime/amountTimes desc

</if>

<if test="null != orderType and 5 == orderType">

order by amountUsedTime/amountTimes asc

</if>

方法二：

case

when timage.original_url is null then '/images/no_picture.gif'

when timage.original_url is null then '/images/no_picture.gif'

when timage.original_url is null then '/images/no_picture.gif'

else timage.original_url

end as tourgallery