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https://docs.mongodb.com/getting-started/shell/ 上面是mongodb AIP文档我们点击进入MongoDB Shell (mongo) Edition (this edition) 这个是让我们在cmd控制台自己进行输出的增删改查

现在下的version都是3.3.2以上的，里面的引擎也改掉了，所以不要用mongovue这个可视化工具了，推荐用http://www.mongobooster.com/ 直接下接，就可以用

还是费话不多说，也不一定能把所有的增删改查的全讲完，有多少写多少，不行以后知道更多了再补，先把一个基本的写上去

如何对mongdb前期的一些准备我就不多说了，不知道的可以看一上一篇

1增

db.students.insert({"name":"ziksang"}) 这是往集合中增加一条document

我们可以看出来如果一条一条插数据的话，会死的，而且命令输入太麻烦 所以我们可以用mongoimport --db test --collection restaurants --drop --file ~/downloads/primer-dataset.jsonmongoimport代表导入数据-db test 代表选择那个数据库-collection restaurants 代表选择那个集合-drop 删除里面所有的所有document-file 代表导入文件~/downloads/primer-dataset.json 表示文件路径，你可以直接用鼠标托到cmd里面就可能以 文件格式要这样

{"name":"aaaaaa","age":20,"sex":"boy","hobby":["f","b","c"],"scroe":{"shuxue":20,"english":100}}
{"name":"bbbbbb","age":10,"sex":"boy","hobby":["a","b","c"],"scroe":{"shuxue":80,"english":100}}
{"name":"cccccc","age":3,"sex":"boy","hobby":["a","b","c"],"scroe":{"shuxue":20,"english":70}}
{"name":"dddddd","age":20,"sex":"boy","hobby":["d","b","c"],"scroe":{"shuxue":10,"english":70}}
{"name":"ffffff","age":10,"sex":"boy","hobby":["a","b","c"],"scroe":{"shuxue":20,"english":100}}
{"name":"gggggg","age":20,"sex":"boy","hobby":["a","b","c"],"scroe":{"shuxue":20,"english":100}}
{"name":"hhhhhh","age":8,"sex":"boy","hobby":["h","b","c"],"scroe":{"shuxue":20,"english":80}}
{"name":"jjjjjj","age":20,"sex":"boy","hobby":["a","b","c"],"scroe":{"shuxue":40,"english":60}}
{"name":"kkkkkk","age":8,"sex":"boy","hobby":["a","b","c"],"scroe":{"shuxue":20,"english":80}}
{"name":"llllll","age":20,"sex":"boy","hobby":["a","b","c"],"scroe":{"shuxue":20,"english":100}}
{"name":"qqqqqq","age":20,"sex":"boy","hobby":["a","b","c"],"scroe":{"shuxue":20,"english":100}}

2删

db.dropDatabase() 删除你所在的当前数据库！！这个一定要小心，不会给你任何提示，然后就删除了

db.students.drop() 删除数据库中students集合

db.students.remove({"age":20}) 删除所有students集合中age:20的文档

db.students.remove({"age":100},{ justOne: true }) 删除最前面一条age:100的文档

3改

单个修改db.students.update({"name":"qqqqqq"},{$set:{"age":100}}) 把学生集合中 name =qqqqq 的 age改成100，但只能修改最上面的一条

多个修改db.students.update({},{$set:{"age":100}},{multi:true}) 查询条件为所有，把所有人的年纪都改成100 mult:true 这个表示多条件更改

把集合中的一个document完整替换 db.students.update({"name":"qqqqqq"},{"name":"iiiiii","age":100}) 把name叫qqqqqq的一整条document 全部替换成{"name":"iiiiii","age":100}

查

db.restaurants.find() 如果find里没有查询条件时，则是列出集合中所有的文档