查询当前数据上一条和下一条的记录
id是指当前数据news_id参数
方法一：
string preSql = "select top 1 * from news where news_id < " + id + " order by news_id DESC" string nextSql = "select top 1 * from news where news_id > " + id + " order by news_id ASC"
方法二：
string preSql = "select * from [news] where news_id = (select MAX(news_id) from [news] where news_id<" + id + ")" string nextSql = "select * from [news] where news_id = (select MIN(news_id) from [news] where news_id>" + id + ")"