MongoDB中的常用語(yǔ)句總結(jié)大全

db.collection.deleteOne()

db.collection.deletMany();

db.student.remove({name:"李四"});

db.student.remove({sex:"男"},true);

db.student.remove({});

db.student.insert([
 {name:"張三",content:"今天心情好",isDel:0},
 {name:"張三",content:"今天心情一般",isDel:0},
]);

db.student.update({"_id" : ObjectId("5bd6a46f1eb7a22fa07cb382")},{
 $set:{
 isDel:1
 }
});

db.student.find({name:"張三",isDel:0});

var arr= [];
for(var i=0;i<10000;i++){
 arr.push({counter:i});
}
db.demos.insert(arr);
db.demos.find();

db.demos.find({counter:666});

db.demos.find({counter:{$lt:666}});

db.demos.find({counter:{$gt:666}});

db.demos.find({counter:{$gt:66, $lt:666}});

db.demos.find().limit(10);

db.demos.find().skip(0).limit(10);//第一頁(yè) 從0條開(kāi)始 每查詢(xún)10條
db.demos.find().skip(10).limit(10);//第二頁(yè) 從10條開(kāi)始 每查詢(xún)10條
db.demos.find().skip(20).limit(10);//第三頁(yè) 從20條開(kāi)始 每查詢(xún)10條

//一對(duì)一
db.aAndb.insert([
 {name:"楊過(guò)",wife:{name:"小龍女",sex:"女"},sex:"男"},
 {name:"楊過(guò)",wife:{name:"小龍女",sex:"女"},sex:"男"}
])

db.aAndb.find();

//一對(duì)多 比如 微博 和 微博評(píng)論
//添加微博
db.weibo.insert([
{weibo:"世界這么大，我想去看看"},
{weibo:"我要做一名web開(kāi)發(fā)者?。?！"}
])

db.weibo.find();

db.comments.insert([
{
weibo_id: ObjectId("5bdd89e06a5e78f4cfc2b9c8"),
list:[
 "那你有錢(qián)嗎",
 "一個(gè)人嗎？？去呢?。?？",
 "加油！！"
]
},
{
weibo_id: ObjectId("5bdd89e06a5e78f4cfc2b9c9"),
list:[
 "那你要學(xué)習(xí)HTML",
 "那還要你要學(xué)習(xí)css",
 "加油！！"
]
}
]);

db.comments.find();

var weibo_id= db.weibo.findOne({"weibo" : "世界這么大，我想去看看"})._id;
db.comments.find({weibo_id: weibo_id});

//多對(duì)多 老師《------》學(xué)生

//插入老師集合
db.teachers.insert([
{
 name:"語(yǔ)文老師",
 teacher_id: 1,
 student_id:[
 1001,
 1002,
 1003
 ]
 },
{
 name:"數(shù)學(xué)老師",
 teacher_id: 2,
 student_id:[
 1001,
 1002,
 1003
 ]
 },
{
 name:"英語(yǔ)老師",
 teacher_id: 3,
 student_id:[
 1001,
 1002,
 1003
 ]
 }
])

db.teachers.find();


//插入學(xué)生集合
db.students.insert([
{
 name:"小明",
 student_id: 1001,
 teacher_id:[
 1,
 2,
 3
 ]
 },
{
 name:"小紅",
 student_id: 1002,
 teacher_id:[
 1,
 2,
 3
 ]
 },
{
 name:"小剛",
 student_id: 1003,
 teacher_id:[
 1,
 2,
 3
 ]
 }
])

db.students.find();
db.teachers.find();

//按照工資升序排列

db.section.find().sort({wages:1});

//優(yōu)先按照工資升序排列 如果遇到相同的就在 按照id升序排列
db.section.find().sort({wages: 1},{_id: -1});

db.section.find({}, {name: 1});
//只顯示name和wages字段
`db.section.find({}, {name: 1, _id: 0, wages: 1});`