mongodb创建、更新、删除

user = {"username":"lcq","sex":"man"}
db.user.insert(user)

var lcq = db.user.findOne({"username":"lcq"}}
lcq.address = {"province":"shandong","location":"zoupin"}
lcq.haha = "hehhehe"
db.user.update({"username":"lcq"},lcq)


> db.user.update({"username":"lcq"},{$set:{"test":"test"}})
> db.user.findOne({"username":"lcq"})
{
        "_id" : ObjectId("55024de2849b70a4f670f413"),
        "address" : {
                "province" : "shandong",
                "location" : "zoupin"
        },
        "haha" : "afdfdfd",
        "sex" : "man",
        "test" : "test",
        "username" : "lcq"
}

> db.user.update({"username":"lcq"},{$unset:{"test":1}})

> lcq = db.user.findOne({"username":"lcq"})
{
        "_id" : ObjectId("55024de2849b70a4f670f413"),
        "address" : {
                "province" : "shandong",
                "location" : "zoupin"
        },
        "haha" : "afdfdfd",
        "sex" : "man",
        "username" : "lcq"
}
>
>
> lcq.count = 1
> db.user.update({"username":"lcq"},lcq)


> db.user.update({"username":"lcq"},{$inc:{"count":2}})

> db.user.update({"username":"lcq"},{$set:{"friends":['zhangsan']}})


> db.user.findOne()
{
        "_id" : ObjectId("55024de2849b70a4f670f413"),
        "address" : {
                "province" : "shandong",
                "location" : "zoupin"
        },
        "count" : 3,
        "friends" : [
                "zhangsan"
        ],
        "haha" : "afdfdfd",
        "sex" : "man",
        "username" : "lcq"
}


> db.user.update({"username":"lcq"},{$push:{"friends":'lisi'}})
>
> db.user.findOne()
{
        "_id" : ObjectId("55024de2849b70a4f670f413"),
        "address" : {
                "province" : "shandong",
                "location" : "zoupin"
        },
        "count" : 3,
        "friends" : [
                "zhangsan",
                "lisi"
        ],
        "haha" : "afdfdfd",
        "sex" : "man",
        "username" : "lcq"
}

> db.user.update({"username":"lcq"},{$addToSet:{"friends":'lisi'}})
>
> db.user.findOne()
{
        "_id" : ObjectId("55024de2849b70a4f670f413"),
        "address" : {
                "province" : "shandong",
                "location" : "zoupin"
        },
        "count" : 3,
        "friends" : [
                "zhangsan",
                "lisi"
        ],
        "haha" : "afdfdfd",
        "sex" : "man",
        "username" : "lcq"
}


> db.user.update({"username":"lcq"},{$addToSet:{"friends":'xiaoming'}})
>
>
> db.user.findOne()
{
        "_id" : ObjectId("55024de2849b70a4f670f413"),
        "address" : {
                "province" : "shandong",
                "location" : "zoupin"
        },
        "count" : 3,
        "friends" : [
                "zhangsan",
                "lisi",
                "xiaoming"
        ],
        "haha" : "afdfdfd",
        "sex" : "man",
        "username" : "lcq"
}
>

> db.user.update({"friends":"lisi"},{$set:{"friends.$":"join"}})
>
>
>
> db.user.findOne()
{
        "_id" : ObjectId("55024de2849b70a4f670f413"),
        "address" : {
                "province" : "shandong",
                "location" : "zoupin"
        },
        "count" : 3,
        "friends" : [
                "zhangsan",
                "join",
                "xiaoming"
        ],
        "haha" : "afdfdfd",
        "sex" : "man",
        "username" : "lcq"
}

> lcq = db.user.findOne()
{
        "_id" : ObjectId("55024de2849b70a4f670f413"),
        "address" : {
                "province" : "shandong",
                "location" : "zoupin"
        },
        "count" : 3,
        "friends" : [
                "zhangsan",
                "join",
                "xiaoming"
        ],
        "haha" : "afdfdfd",
        "sex" : "man",
        "username" : "lcq"
}
>
>
> lcq.count = 10
10
>


> db.user.save(lcq)
>


> db.user.findOne()
{
        "_id" : ObjectId("55024de2849b70a4f670f413"),
        "address" : {
                "province" : "shandong",
                "location" : "zoupin"
        },
        "count" : 10,
        "friends" : [
                "zhangsan",
                "join",
                "xiaoming"
        ],
        "haha" : "afdfdfd",
        "sex" : "man",
        "username" : "lcq"
}

> db.user.insert({"username":"zhangsan"})
> db.user.remove({"username":"zhangsan"})

mongodb创建、更新、删除

原文：http://blog.csdn.net/liuchangqing123/article/details/44240417