要在 MongoDB v3 中创建用户，请使用 createUser() 方法。这允许您创建用户，并且在创建时还需要添加用户、密码和角色。这些角色分配权限。语法如下 -

use admin
db.createUser(
   {
      user: “yourUserName",
      pwd: "yourPassword",
      roles: [ { role: "yourPermission", db: "yourDatabase" } ]
   }
);

让我们实现上述语法以便在 MongoDB v3 中创建用户 -

> use admin
switched to db admin
> db.createUser(
...    {
...       user: "Robert",
...       pwd: "robert",
...       roles: [ { role: "readWrite", db: "sample" } ]
...    }
... );

在上面，我们为新用户设置了以下内容 -

User: Robert
Password: robert
Roles: readWrite
This will produce the following output:
Successfully added user: {
   "user" : "Robert",
   "roles" : [
      {
         "role" : "readWrite",
         "db" : "sample"
      }
   ]
}

我们已经在上面成功创建了一个新用户“Robert”。