请问怎么把sql.Rows转成map

如题..我想把sql.Rows转成map..请问怎么实现写了下..失败了代码如下

func (this *Admin) Query(query string, args ...interface{}) ([]map[string]interface{}, error) {
    db, err := this.getDB()
    defer db.Close()
    if err != nil {
        return nil, err
    }
    stmt, err := db.Prepare(query)
    defer stmt.Close()
    if err != nil {
        return nil, err
    }
    res, err := stmt.Query(args...)
    defer res.Close()
    if err != nil {
        return nil, err
    }
    fields, _ := res.Columns()
    fieldslen := len(fields)
    ms := []map[string]interface{}{}
    for res.Next() {
        m := map[string]interface{}{}
        scaninterfaces := make([]interface{}, 0, fieldslen)
        for _, field := range fields {
            //m[field] = 0
            scaninterfaces = append(scaninterfaces, m[field])
        }
        res.Scan(scaninterfaces...)
        ms = append(ms, m)
    }
    return ms, nil
}