@NotNull public QueryBuilder appendPlaceholders(int count){
  if (count <= 0)   throw new IllegalArgumentException("count must be positive, but was: " + count);
  query.append('?');
  for (int i=1; i < count; i++)   query.append(",?");
  return this;
}

@ NotNull public QueryBuilder appendPlaceholders ( int count ) { if ( count <= 0 ) throw new IllegalArgumentException ( "count must be positive, but was: " + count ) ; query . append ( '?' ) ; for ( int i = 1 ; i < count ; i ++ ) query . append ( ",?" ) ; return this ; }
adds a given amount of comma - separated place - holders . the amount must be at last 1 .
