运用NaviCat进行MongoDB查询管道操作索引等操作

//空值查询

db.myMongoDB.find({"state":null})

//正则查询

db.myMongoDB.find({"content":/^何 /})

//精度查询

db.myMongoDB.find({"phone":{"homePhone":"82174911","mobilePhone":"13065840128"}})

//点查询

db.myMongoDB.find({"phone.homePhone":"62771541"})

//分组管道操作

// $group

db.myMongoDB.aggregate([{$group:{"_id":"$userid"}}])

//$limit

db.myMongoDB.aggregate({$limit:3})

//$match

db.myMongoDB.aggregate([{$match:{"nickname":"小潘"}}])

//$sort

db.myMongoDB.aggregate([{$sort:{"age":-1}}])

//$project

db.myMongoDB.aggregate([{$project:{"_id":0}}])

//$skip

db.myMongoDB.aggregate({$skip:3})

use dashuju3;

db.createCollection("product")

db.product.insertMany([

{"_id":"1","name":"iPhone 14","price":3000,"type":"电子通讯"},

{"_id":"2","name":"adidas neo","price":700,"type":"服装"},

{"_id":"3","name":"nike air max 90","price":760,"type":"服装"},

{"_id":"4","name":"HuaWei mate30","price":5000,"type":"电子通讯"},

{"_id":"5","name":"vivo x27","price":2000,"type":"电子通讯"},

])

//$sum

db.product.aggregate([{$group:{"_id":"$type","price":{$sum:"$price"}}}])

//$avg

db.product.aggregate([{$group:{"_id":"$type","price":{$avg:"$price"}}}])

//$min

db.product.aggregate([{$group:{"_id":"$type","price":{$min:"$price"}}}])

//$max

db.product.aggregate([{$group:{"_id":"$type","price":{$max:"$price"}}}])

//$push

db.product.aggregate([{$group:{"_id":"$type","tags":{$push:"$name"}}}])

//$first

db.product.aggregate([{$group:{"_id":"$type","tags":{$first:"$name"}}}])

//$last

db.product.aggregate([{$group:{"_id":"$type","tags":{$last:"$name"}}}])

//查询索引

db.myMongoDB.getIndexes()

//查询索引大小

db.myMongoDB.totalIndexSize()

//新建索引

db.myMongoDB.createIndex({userid:1})

//创建复合索引

db.myMongoDB.createIndex({userid:1,nickname:-1})

//删除索引

db.myMongoDB.dropIndex({userid:1})

db.myMongoDB.dropIndexes()

use dashuju3;

db.createCollection("myMongoDB")

show dbs;

db.mymongodb.insertMany([

{"_id":"1","articleid":"1000001","content":"早上好","userid":"1002","nickname":"小杰","age":"18","phone":{"homePhone":"82174911","mobilePhone":"13065840128"},"state":"1","createdatetime":new Date("2020-01-02 09:08:15"),"likenum":NumberInt(1000)},

{"_id":"2","articleid":"1000001","content":"中午好","userid":"1003","nickname":"小欣","age":"22","phone":"13065840128","state":"1","createdatetime":new Date("2020-01-02 09:08:15"),"likenum":NumberInt(888)},

{"_id":"3","articleid":"1000001","content":"傍晚好","userid":"1004","nickname":"小何","age":"28","phone":"13065840128","state":null,"createdatetime":new Date("2020-01-02 09:08:15"),"likenum":NumberInt(666)},

{"_id":"4","articleid":"1000001","content":"晚上好","userid":"1006","nickname":"小潘","age":"25","phone":{"homePhone":"62771541","mobilePhone":"13262984142"},"state":"1","createdatetime":new Date("2020-01-03 15:10:37"),"likenum":NumberInt(3000)},

{"_id":"5","articleid":"1000001","content":"凌晨好","userid":"1004","nickname":"小星","age":"18","phone":"13065840128","state":null,"createdatetime":new Date("2020-01-02 09:08:15"),"likenum":NumberInt(2000)},

{"_id":"6","articleid":"1000001","content":"清晨好","userid":"1004","nickname":"小柿","age":"18","phone":"13065840128","state":null,"createdatetime":new Date("2020-01-02 09:08:15"),"likenum":NumberInt(3000)},

])

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