mongodb常用操作

查询文档列表

db.getCollection('documentinfo').find({"mustRead": true, "docStatus": "online", "$or": [{"docPermissionType": "public"}]}).count()

修改文档字段名

//  单个修改
db.getCollection('exam').update({_id: "1f51310a-518f-4816-8518-302f4a8bd437"}, { $rename: { "employee_id": "employeeId" }})
//  批量修改
db.getCollection('exam').updateMany({}, { $rename: { "employee_id": "employeeId" }}) 
参加：https://docs.mongodb.com/manual/reference/operator/update/

更新，修改字段

db.getCollection('exam').updateOne({_id: "1f51310a-518f-4816-8518-302f4a8bd437"}, {$set: {"isPassed": false}} )

查询文档中某个字段是否存在

db.getCollection('userinfo').find({ "isPassed": { $exists: true } }).count()

删除文档中某个字段

//  删除单个
db.getCollection('userinfo').delete({_id: "1f51310a-518f-4816-8518-302f4a8bd437"}, {$unset: {"duhuo": ''}} )
//  批量删除
db.getCollection('userinfo').deleteMany({}, {$unset: {"duhuo": ''}} )