code: func NewDbMap(db *sql.DB, dialect Dialect) *DbMap {
  	return &DbMap{
  		Db:      db,
  		Dialect: dialect,
  		Dbx:     sqlx.NewDb(db, dialect.DriverName()),
  		mapper:  reflectx.NewMapperFunc("db", sqlx.NameMapper),
  	}
  }
docs: // NewDbMap returns a new DbMap using the db connection and dialect.