$lt(<) $lte(<=) $gt(>) $gte(>=) $ne(!=) $in $not $size $where limit(5).skip(5).sort({"number" : -1}

$lt(<) $lte(<=) $gt(>) $gte(>=)  $ne(!=) $in $not $size $where limit(5).skip(5).sort({"number" : -1} 查询关键字

$lt(<) $lte(<=) $gt(>) $gte(>=)  $ne(!=)

查询一个范围内的数据

> db.qwen.number.find({"number" : { "$gt" : 900 ,"$lt" : 910,"$ne":905 } })

{ "_id" : ObjectId("50da8f322ffd118128237aee"), "name" : "qwen", "number" : 901

}

{ "_id" : ObjectId("50da8f322ffd118128237aef"), "name" : "qwen", "number" : 902

}

{ "_id" : ObjectId("50da8f322ffd118128237af0"), "name" : "qwen", "number" : 903

}

{ "_id" : ObjectId("50da8f322ffd118128237af1"), "name" : "qwen", "number" : 904

}

{ "_id" : ObjectId("50da8f322ffd118128237af3"), "name" : "qwen", "number" : 906

}

{ "_id" : ObjectId("50da8f322ffd118128237af4"), "name" : "qwen", "number" : 907

}

{ "_id" : ObjectId("50da8f322ffd118128237af5"), "name" : "qwen", "number" : 908

}

{ "_id" : ObjectId("50da8f322ffd118128237af6"), "name" : "qwen", "number" : 909

}

$in(存在于数组中的) $nin (不存在于数组中的） $or(或者条件)

> db.qwen.number.find({"number" : { "$in" : [ 901,902 ] } })

{ "_id" : ObjectId("50da8f322ffd118128237aee"), "name" : "qwen", "number" : 901

}

{ "_id" : ObjectId("50da8f322ffd118128237aef"), "name" : "qwen", "number" : 902

}

> db.qwen.number.find( {"number" : { "$nin" : [ 995,998 ],"$lt" : 1000,"$gt" : 9

90 } })

{ "_id" : ObjectId("50da8f322ffd118128237b48"), "name" : "qwen", "number" : 991

}

{ "_id" : ObjectId("50da8f322ffd118128237b49"), "name" : "qwen", "number" : 992

}

{ "_id" : ObjectId("50da8f322ffd118128237b4a"), "name" : "qwen", "number" : 993

}

{ "_id" : ObjectId("50da8f322ffd118128237b4b"), "name" : "qwen", "number" : 994

}

{ "_id" : ObjectId("50da8f322ffd118128237b4d"), "name" : "qwen", "number" : 996

}

{ "_id" : ObjectId("50da8f322ffd118128237b4e"), "name" : "qwen", "number" : 997

}

{ "_id" : ObjectId("50da8f322ffd118128237b50"), "name" : "qwen", "number" : 999

}

$not(可以用于附于任何条件之上) $all匹配所有数组 并且支持正则表达式的查询条件(javascript的语法）

$size取条件中的某部分值,$slice返回数组的一个子集合。

$where支持javascript函数调用来匹配查询.查询的性能较差，因为不能利用索引并且还需要java转换一次。

> db.qwen.foo.insert({"apple" : 1,"banana" : 6,"peach" : 3})

> db.qwen.foo.insert({"apple" : 8,"spinach" : 4,"watermelon" : 4 })

> db.qwen.foo.find({"$where" : function()

{

  for(var current in this)

    {

      for(var other in this )

        {

          if(current != other && this[current] == this[other] )

            { return true; }

        }

    }  

}

})

{ "_id" : ObjectId("50da96c22ffd118128239e7b"), "apple" : 8, "spinach" : 4, "wat

ermelon" : 4 }

limit(5).skip(5).sort({"number" : -1}每次只显示5条，且排倒序（1为升序）Skip()这种查询就是游标，对于数据集比较大时，性能通常并不好。

> db.qwen.number.find({"name" : "qwen" } ).limit(5).skip(5).sort({"number" : -1})

{ "_id" : ObjectId("50da8f332ffd118128239e74"), "name" : "qwen", "number" : 9995

 }

{ "_id" : ObjectId("50da8f332ffd118128239e73"), "name" : "qwen", "number" : 9994

 }

{ "_id" : ObjectId("50da8f332ffd118128239e72"), "name" : "qwen", "number" : 9993

 }

{ "_id" : ObjectId("50da8f332ffd118128239e71"), "name" : "qwen", "number" : 9992

 }

{ "_id" : ObjectId("50da8f332ffd118128239e70"), "name" : "qwen", "number" : 9991

 }

>