mongodb常规操作语句

db.c_user.insertOne({
    name: "ljm",
    pwd: "123456"
}); //插入一个

db.c_user.insertMany([{
    item: "wjl",
    age: "25",
    tags: ["blank", "red"],
    size: {
        h: 14,
        w: 21
    }
},
{
    item: "ljm",
    age: "18",
    tags: ["blank", "red"],
    size: {
        h: 14,
        w: 21
    }
}]) ;//插入多个
db.c_type.insertMany([{
    item: "wjl",
    age: "25",
    tags: ["blank", "red"],
    size: {
        h: 14,
        w: 21
    }
},
{
    item: "ljm",
    age: "18",
    tags: ["blank", "red"],
    size: {
        h: 14,
        w: 21
    }
}]) ;//插入多个

db.getCollection("c_user").find({}) ;
db.getCollection("c_user").find(); 
db.c_user.find({
    name: "ljm"
}) ;//Key:value 查询，相当于where name = ""

db.getCollection("c_type").find({});

db.c_user.find({
    name: "wjl",
    age: {
        $lt: 30
    }
}); // where .. and ... ,lt < ; gt >

db.c_user.find({
    $or: [{
        name: "wjl"
    },
    {
        age: {
            $lt: 30
        }
    }]
}); // where ... or ... 

db.c_user.find({
    name: "wjl",
    $or: [{
        age: {
            $lt: 30
        }
    },
    {
        name: /^m/
    }]
}); // where and .. or ..

db.c_user.find({
    name: {
        $in: ["wjl", "ljm"]
    }
}) ;//where in 
db.c_user.updateOne({
    "_id": ObjectId("5d034c0de20035e8e98d684a")
},
{
    $set: {
        pwd: "1315565452",
        name: "zhangsan"
    }
}); //修改一个

db.c_user.updateMany({
    name: "wjl"
},
{
    $set: {
        pwd: "1315565452",
        name: "zhangsan"
    }
}); //修改多个

db.c_user.replaceOne({
    name: "ljm"
},
{
    name: "ljm",
    age: "80"
}) ;//替换一个

db.c_user.deleteOne({
    "_id": ObjectId("5d034fdee20035e8e98d6850")
}) ;//删除一个