code: func (engine *Engine) Find(beans interface{}, condiBeans ...interface{}) error {
  	session := engine.NewSession()
  	defer session.Close()
  	return session.Find(beans, condiBeans...)
  }
docs: // Find retrieve records from table, condiBeans's non-empty fields
  // are conditions. beans could be []Struct, []*Struct, map[int64]Struct
  // map[int64]*Struct