@julian I get it,although it is still confused with me,anyway, thank you too!

@baris thank you! I has read this wiki,but It is only part of Database structure.I need to know all of it.~~

Hello Dear:
I use Redis Desktop Manager load the NodeBB Database,but I can figure out the model relationship.I need to know how datas work in nodeBB,then I can create a forum of own,do you have Database model there?anything,like photo,doc...，it is grateful to this.