MongoDb常用sql语句

前言

很早之前的笔记，同步一下

官方地址

选择数据库，不存在则创建

use cool 

删除数据表

 # 等价于mysql drop table user
 db.user.drop() 

数据查找

find() 方法查找多条,findOne() 查找一条

查全部

# 等价于mysql select * from user
db.user.find() 

单条件查找

# 等价mysql select * from user where name = 'xie' 
db.user.find({"name":"xie"}) 

多条件AND

# 等价于mysql select * from user where name = 'xie' and age = 25 
db.user.find({"name":"xie","age":25}) 

WHERE IN

# 等价mysql select * from user where age in (25,33) 
db.user.find({"age":{$in:[25,33]}}) 

OR

# 等价mysql select * from user where age = 25 or age = 33 
db.user.find({$or:[{age:25},{age:33}]}) 

AND OR 连用

# 等价mysql select * from user where age = 25 and (name in ("rui","lucky") or weight = 90) 
db.user.find( {age:25, $or:[ {name:{$in:["rui","lucky"]}}, {"info.weight":90}]}) 

# 等价mysql select * from user where (age = 25 and name = "xie") or (age = 50 or name = "rui" ) 
db.user.find({$or:[  {age:25,name:"xie"},  {age:50,name:"rui"} ]}) 

LIKE

# 等价于mysql select * from user where name like "%i%"
db.user.find({name:/i/}) 

# 等价mysql select * from user where name like "x%" 
db.user.find({name:/^x/}) 

# 等价于mysql select * from user where name like "%g" 
db.user.find({name:/g$/}) 

大于

# 等价于 mysql select * from user where age > 25 
db.user.find({age:{$gt:25}}) 

大于等于

# 等价于 mysql select * from user where age >= 25 
db.user.find({age:{$gte:25}}) 

小于

# 等价于 mysql select * from user where age < 55 
db.user.find({age:{$lt:55}}) 

小于等于

# 等价于 mysql select * from user where age <= 55 
db.user.find({age:{$lte:55}}) 

数据插入

单条插入

# 等价于 mysql insert（`name`,`age`,`info`） value ('xie',25,'{"height":183,"weight":90"}') 
db.user.insert({name:"xie",age:25,info:{height:183,weight:90}}) 

一次插入多条

#等价于 insert user (`name`,`age`,`info`) values
#('xie',25,'{"height":183,"weight":90}'),
#('rui',50,'{"height":180,"weight":85}'),
#('xiang',33,'{"height":175,"weight":80}'),
#('goods',55,'{"height":170,"weight":90}'),
#('lucky',45,'{"height":165,"weight":70}');
db.user.insertMany([
  { name: "xie", age: 25, info: { height: 183, weight: 90, }},
  { name: "rui", age: 50, info: { height: 180, weight: 85}}, 
  { name: "xiang", age: 33, info: { height: 175, weight: 80}}, 
  { name: "goods", age: 55, info: { height: 170, weight: 90}}, 
  { name: "lucky", age: 45, info: { height: 165, weight: 70}}
]) 

数据修改

单条修改

# 等价于 mysql update user set name = "update after" where age = 25 limit 1 
db.user.updateOne({age:25},{$set:{name:"update after"}}) 

多条修改

# 等价于 mysql update user set name = "update after" where age = 25 
db.user.updateMany({age:25},{$set:{name:"update after"}}) 

数据删除

单条删除

# 等价于 mysql delete from user where age = 25 limit 1 
db.user.deleteOne({age:25}) 

多条删除

# 等价于 mysql delete from user where age = 25 
db.user.deleteMany({age:25}) 

查找到数据就修改，找不到就创建

# 查找一个，找到就修改 
# 由于设置upsert:true 找不到会创建数据 
# 由于设置returnNewDocument:true 如果数据不存在，且upsert:true,则返回新创建的数据内容 
db.user.findOneAndUpdate({age:31},{$set:{name:"kiki"}},{upsert:true,returnNewDocument:true}) 

# $setOnInsert 标识指定了插入时的参数 
# 下面语句表示找的到就展示,找不到就创建并展示 
db.user.findOneAndUpdate({_id:"619c88322bd7557260e6886j"},{$setOnInsert:{name:"666g",_id:"619c88322bd7557260e68862"}},{upsert:true,returnNewDocument:true})