账户：root 密码：123456 用户角色：root 数据库：admin
账户：admin 密码：123456 用户角色：readWriteAnyDatabase/userAdminAnyDatabase 数据库：admin
账户：stockUser 密码：123456 用户角色：readWrite/dbOwner 数据库：stock


db.createUser({
     user:"root",
     pwd:"123456",
     roles:[
         {role:"root",db:"admin"}
     ]
});
db.createUser({
     user:"admin",
     pwd:"123456",
     roles:[
         {role:"readWriteAnyDatabase",db:"admin"},
         {role:"userAdminAnyDatabase",db:"admin"}
     ]
});
db.createUser({
     user:"stockUser",
     pwd:"123456",
     roles:[
         {role:"readWrite",db:"stock"},
         {role:"dbOwner",db:"stock"}
     ]
});