---
User: 
  tableName: user
  className: User
  columns: 
    id: 
      notnull: true
      primary: true
      autoincrement: true
      type: integer
      length: 4
      name: id
    username: 
      type: string
      length: 255
Group: 
  tableName: group
  className: Group
  columns: 
    id: 
      notnull: true
      primary: true
      autoincrement: true
      type: integer
      length: 4
      name: id
    name: 
      type: string
      length: 255