iBatis in或not in 查询
open:内容开头
close:内容结尾
conjunction:分隔符
<isNotNull prepend="and" property="uidList">weibouid [in | not in]<iterate property="uidList" open="(" close=")" conjunction=",">#uidList[]#</iterate></isNotNull>使用in将not in去掉,not in反之