mongodb数据操作(CRUD)

> use hk
switched to db hk
> show collections
> db.info.insert({"url":"www.lepu.cn"})
WriteResult({ "nInserted" : 1 })
> db.info.find()
{ "_id" : ObjectId("592bd4324c964b7784cca90f"), "url" : "www.lepu.cn" }

db.info.insert([
        {"url":"www.baidu.com"},
        {"url":"www.9888.cn"},
        {"url":"www.a.cn"}
]);

for(var i=0;i<1000;i++){
        db.info.insert({"url":"url->"+i});
}

db.info.find({"url":"www.9888.cn"},{"_id":0,"url":1})
> db.info.find({"url":"www.9888.cn"},{"_id":0,"url":1})
{ "url" : "www.9888.cn" }

var data={
        "name":"hkui",
        "age":26,
        "hobby":"footbal,music",
        "info":"it码农，哈哈哈哈哈哈哈"
};
db.info.insert(data);

db.stu.find({"name":"tom"}).pretty();
db.stu.find({"address":"山东"}).pretty();
age大于20的
db.stu.find({"age":{"$gt":20}}).pretty();
查询姓名不是tom的
db.stu.find({"name":{"$ne":"tom"}}).pretty();

与($and)
或($or)
非($not,$nor)

查询年龄在18~21
db.stu.find({"age":{"$gte":18,"$lte":21}})
查询年龄小于20或者score>80的
db.stu.find({"$or":
[
    {"age":{"$lt":20}},
    {"score":{"$gt":80}}
]
}).pretty();

取反操作
db.stu.find({"$nor":
[
    {"age":{"$lt":22}},
    {"score":{"$gt":90}}
]
}).pretty();

$mod
{$mod:[数字,余数]}
取出除数是20,,余数为1的
db.stu.find({"age":{"$mod":[20,1]}}).pretty();
范围查询
$in或者$nin
db.stu.find({
 "address":{"$in":["河南","山东"]}
})

$all,$size,$slice,$elemMath

db.stus.drop();
db.stus.insert({"name":"hk1","sex":"男","age":18,"score":70,"address":"河南","course_id":[1,2,3,4,5]});
db.stus.insert({"name":"hk2","sex":"女","age":20,"score":60,"address":"山东","course_id":[1,2,3,4]});
db.stus.insert({"name":"hk3","sex":"男","age":17,"score":44,"address":"江苏","course_id":[1,2,3]});
db.stus.insert({"name":"hk4","sex":"男","age":21,"score":80,"address":"山东","course_id":[1,3]});
db.stus.insert({"name":"hk5","sex":"女","age":23,"score":50,"address":"湖北","course_id":[2,3,4]});
db.stus.insert({"name":"tom","sex":"男","age":24,"score":20,"address":"海南","course_id":[1]});
db.stus.insert({"name":"lucy","sex":"女","age":21,"score":62,"address":"浙江","course_id":[3,4]});
db.stus.insert({"name":"jack","sex":"男","age":20,"score":90,"address":"美国","course_id":[1,2,3,4]});
db.stus.insert({"name":"smith","sex":"男","age":19,"score":88,"address":"美国","course_id":[2,4]});

db.stus.find({"course_id":{"$all":[2,4]}}).pretty();

db.stus.find({"address":{"$all":["河南","山东"]}}).pretty();
//无结果
db.stus.find({"address":{"$all":["河南"]}}).pretty();
//查出了家是河南的

db.stus.find({"course_id.1":4}).pretty();

//只参加2门课程的
db.stus.find({"course_id":{"$size":2}}).pretty();
//数组截取
//取前2门
db.stus.find({"age":18},{"course_id":{"$slice":2}}).pretty(); //1,2
//后2门
db.stus.find({"age":18},{"course_id":{"$slice":-2}}).pretty();//4,5

db.stus.find({"age":18},{"course_id":{"$slice":[1,2]}}).pretty();//2,3

db.stus.find({"age":18},{"course_id":{"$slice":[3,1]}}).pretty();//4 //闭合区间，长度

查询出age大于18,父母里有是程序员的
db.stus1.find({
    "$and":
        [
            { "age":{"$gt":18}},
            { "parents":{ "$elemMatch":
                    {"job":"程序员"} 
                    } 
            }
        ]
}).pretty();

查询出age大于18,父母里有是程序员的而且程序员年龄小于50
db.stus1.find({
    "$and":
        [
            { "age":{"$gt":18}},
            { "parents":{ "$elemMatch":
                    {"$and":
                        [{"job":"程序员"},{"age":{"$lt":50}}]
                    } 
                    } 
            }
        ]
}).pretty();

db.stus.find({"parents":{"$exists":true}}).pretty();
db.stus.find({"parents":{"$exists":false}}).pretty();

查询年龄大于20的
db.stu.find({"$where":"this.age>20"});
db.stu.find("this.age>20");

db.stu.find(function(){
    return this.age>20;
})

db.stu.find({"$where":function(){
        return this.age>20;
}});

db.stu.find({"$and":[
{"$where":"this.age>20"},
{"$where":"this.age<22"},

]});