MongoDB 数据库日常操作

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本文详细介绍了MongoDB的日常操作，包括数据库的创建、数据的插入与查询、集合的管理和更新，以及数据的删除和索引的创建。通过具体实例展示了如何在MongoDB中进行高效的数据管理。

1 MongoDB 日常操作

1.1 创建数据库

创建studentService，并show所有数据库

> use studentService
switched to db studentService
> db
studentService
> show dbs
admin   0.000GB
config  0.000GB
local   0.000GB

1.2 插入数据

发现没有显示studentService，是因为MongoDB不显示空的db，要想显示，需要插入些数据

> db.studentService.insert({"name":"Weison"})
WriteResult({ "nInserted" : 1 })
> show dbs
admin           0.000GB
config          0.000GB
local           0.000GB
studentService  0.000GB

1.3 刷新客户端

这是刷新客户端连接工具，就可以看到studentService和表了

1.4 往集合中插数据

> db.students.insert({"name":"Weison","sex":"男"})
WriteResult({ "nInserted" : 1 })
> db.scores.insert({"name":"Weison","score":"98"})
WriteResult({ "nInserted" : 1 })
> show collections
score
scores
studentService
students

1.5 删除集合

> db.score.drop()
true
> db.studentService.drop()
true
> show collections
scores
students

1.6 更新集合

> db.students.update({'name':'Weison'},{$set:{'phoneNum':18702966632}})
WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })
> db.students.find().pretty()
{
	"_id" : ObjectId("5cff41a9c88cf469cc121da9"),
	"name" : "Weison",
	"sex" : "男",
	"phoneNum" : 18702966632
}

1.7 更新多个数据

> db.students.update({'sex':'男'},{$set:{'describe':'this is a man'}},{multi:true})
WriteResult({ "nMatched" : 2, "nUpserted" : 0, "nModified" : 2 })
> db.students.find().pretty()
{
	"_id" : ObjectId("5cff41a9c88cf469cc121da9"),
	"name" : "Weison",
	"sex" : "男",
	"phoneNum" : 18702966632,
	"describe" : "this is a man"
}
{
	"_id" : ObjectId("5cff42fcc88cf469cc121dab"),
	"name" : "Lucas",
	"sex" : "男",
	"describe" : "this is a man"
}

1.8 删除数据

> db.students.remove({'name':'Jac'})
WriteResult({ "nRemoved" : 1 })
> db.students.remove({'name':'Jack'})
WriteResult({ "nRemoved" : 1 })

1.9 创建索引

> db.students.createIndex({'stId':1})
{
	"createdCollectionAutomatically" : false,
	"numIndexesBefore" : 1,
	"numIndexesAfter" : 2,
	"ok" : 1
}

在这里插入图片描述

1.10 以优雅的姿势展示结果

> db.students.find().pretty()
{
	"_id" : ObjectId("5cff41a9c88cf469cc121da9"),
	"name" : "Weison",
	"sex" : "男",
	"phoneNum" : 18702966632,
	"describe" : "this is a man"
}
{
	"_id" : ObjectId("5cff42fcc88cf469cc121dab"),
	"name" : "Lucas",
	"sex" : "男",
	"describe" : "this is a man"
}
{
	"_id" : ObjectId("5cff4647c88cf469cc121db0"),
	"name" : "Jack",
	"sex" : "男"
}