查询表中学生年级大于20,如下: db.getCollection('student').find({'age':{'$gt':'20'}}) $lt < (less than ) $lte <= (less than or equal to ) $gt > (greater than ) $gte >= (greater than or equal to) $ne != (not equal to)不等于 {'age': {'
原创博客,转载请注明:http://www.cnblogs.com/albert1017/p/3361932.html 查询时有多个参数,参数个数由客户输入决定,不能确定有多少个参数,按一般的方法每种参数组合都得写个方法,很麻烦,解决方法如下: select * from table where (addDate = @addDate or @addDate is null) and (name = @name or @name = '') 这样的话当有不需要的条件时,就往函数对应参数传入nul
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