func (db *DB) selectToSlice(rows *sql.Rows, t reflect.Type) (reflect.Value, error) {
	columns, err := rows.Columns()
	if err != nil {
		return reflect.Value{}, err
	}
	t = t.Elem()
	ptrN := 0
	for ; t.Kind() == reflect.Ptr; ptrN++ {
		t = t.Elem()
	}
	fieldIndexes := make([][]int, len(columns))
	for i, column := range columns {
		index := db.fieldIndexByName(t, column, nil)
		if len(index) < 1 {
			return reflect.Value{}, fmt.Errorf("`%v` field isn't defined in %v or embedded struct", stringutil.ToUpperCamelCase(column), t)
		}
		fieldIndexes[i] = index
	}
	dest := make([]interface{}, len(columns))
	var result []reflect.Value
	for rows.Next() {
		v := reflect.New(t).Elem()
		for i, index := range fieldIndexes {
			field := v.FieldByIndex(index)
			dest[i] = field.Addr().Interface()
		}
		if err := rows.Scan(dest...); err != nil {
			return reflect.Value{}, err
		}
		result = append(result, v)
	}
	if err := rows.Err(); err != nil {
		return reflect.Value{}, err
	}
	for i := 0; i < ptrN; i++ {
		t = reflect.PtrTo(t)
	}
	slice := reflect.MakeSlice(reflect.SliceOf(t), len(result), len(result))
	for i, v := range result {
		for j := 0; j < ptrN; j++ {
			v = v.Addr()
		}
		slice.Index(i).Set(v)
	}
	return slice, nil
}
func (db *DB) selectToSlice(rows *sql.Rows, t reflect.Type) (reflect.Value, error) {
	columns, err := rows.Columns()
	if err != nil {
		return reflect.Value{}, err
	}
	t = t.Elem()
	ptrN := 0
	for ; t.Kind() == reflect.Ptr; ptrN++ {
		t = t.Elem()
	}
	fieldIndexes := make([][]int, len(columns))
	for i, column := range columns {
		index := db.fieldIndexByName(t, column, nil)
		if len(index) < 1 {
			return reflect.Value{}, fmt.Errorf("`%v` field isn't defined in %v or embedded struct", stringutil.ToUpperCamelCase(column), t)
		}
		fieldIndexes[i] = index
	}
	dest := make([]interface{}, len(columns))
	var result []reflect.Value
	for rows.Next() {
		v := reflect.New(t).Elem()
		for i, index := range fieldIndexes {
			field := v.FieldByIndex(index)
			dest[i] = field.Addr().Interface()
		}
		if err := rows.Scan(dest...); err != nil {
			return reflect.Value{}, err
		}
		result = append(result, v)
	}
	if err := rows.Err(); err != nil {
		return reflect.Value{}, err
	}
	for i := 0; i < ptrN; i++ {
		t = reflect.PtrTo(t)
	}
	slice := reflect.MakeSlice(reflect.SliceOf(t), len(result), len(result))
	for i, v := range result {
		for j := 0; j < ptrN; j++ {
			v = v.Addr()
		}
		slice.Index(i).Set(v)
	}
	return slice, nil
}
// selectToSlice returns a slice value fetched from rows.