早期有插入一点数据，现在继续插入

> db.centos.hr_study.insert({"name":"赵5","age":"50","height":170,"sex":'男'})

WriteResult({ "nInserted" : 1 })

> db.centos.hr_study.insert({"name":"李5","age":"60","height":160,"sex":'女'})

WriteResult({ "nInserted" : 1 })

> db.centos_hr_study.insert({"name":"赵5","age":"50","height":170,"sex":'男'})

WriteResult({ "nInserted" : 1 })

> db.centos_hr_study.insert({"name":"李6","age":"60","height":160,"sex":'女'})

WriteResult({ "nInserted" : 1 })

更新文档：加粗部分是条件，如果匹配到则更新文档，否则（有些文章说没匹配到则插入一条新的，但此处测试并没有产生新的）

> db.centos_hr_study.update({"name":"赵5"},{"name":"赵5","age":"50","height":150,"sex":'不男不女'})

WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })

查看最新数据：

> db.centos_hr_study.find()

{ "_id" : ObjectId("5b61d2bf2d2a29b484b2a8b8"), "name" : "这是一个在centos中建立的用于学习的mongodb数据库" }

{ "_id" : ObjectId("5b61d55d2d2a29b484b2a8ba"), "name" : "张三", "age" : "20" }

{ "_id" : ObjectId("5b61d5752d2a29b484b2a8bb"), "name" : "张4", "age" : "40" }

{ "_id" : ObjectId("5b61d7932d2a29b484b2a8be"), "name" : "赵5", "age" : "50", "height" : 150, "sex" : "不男不女" }

{ "_id" : ObjectId("5b61d79d2d2a29b484b2a8bf"), "name" : "李6", "age" : "60", "height" : 160, "sex" : "女" }

测试未匹配时是否产生一条新的，如果：未产生

> db.centos_hr_study.update({"name":"张3"},{"name":"张3","age":"30","height":130,"sex":'30的男人'})

WriteResult({ "nMatched" : 0, "nUpserted" : 0, "nModified" : 0 })

> db.centos_hr_study.find()

{ "_id" : ObjectId("5b61d2bf2d2a29b484b2a8b8"), "name" : "这是一个在centos中建立的用于学习的mongodb数据库" }

{ "_id" : ObjectId("5b61d55d2d2a29b484b2a8ba"), "name" : "张三", "age" : "20" }

{ "_id" : ObjectId("5b61d5752d2a29b484b2a8bb"), "name" : "张4", "age" : "40" }

{ "_id" : ObjectId("5b61d7932d2a29b484b2a8be"), "name" : "赵5", "age" : "50", "height" : 150, "sex" : "不男不女" }

{ "_id" : ObjectId("5b61d79d2d2a29b484b2a8bf"), "name" : "李6", "age" : "60", "height" : 160, "sex" : "女" }

> 

如果匹配，则覆盖命中的数据：

> db.centos_hr_study.update({"name":"张三"},{"name":"张三","age":"30","height":"130"})

WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })

> db.centos_hr_study.find()

{ "_id" : ObjectId("5b61d2bf2d2a29b484b2a8b8"), "name" : "这是一个在centos中建立的用于学习的mongodb数据库" }

{ "_id" : ObjectId("5b61d55d2d2a29b484b2a8ba"), "name" : "张三", "age" : "30", "height" : "130" }

{ "_id" : ObjectId("5b61d5752d2a29b484b2a8bb"), "name" : "张4", "age" : "40" }

{ "_id" : ObjectId("5b61d7932d2a29b484b2a8be"), "name" : "赵5", "age" : "50", "height" : 150, "sex" : "不男不女" }

{ "_id" : ObjectId("5b61d79d2d2a29b484b2a8bf"), "name" : "李6", "age" : "60", "height" : 160, "sex" : "女" }

>