sql.Rows 转换为 []map[string]interface{} 类型

// *sql.Rows 转换为 []map[string]interface{}类型
func rows2maps(rows *sql.Rows) (res []map[string]interface{}) {

    defer rows.Close()
    cols, _ := rows.Columns()
    cache := make([]interface{}, len(cols))
    // 为每一列初始化一个指针
    for index, _ := range cache {
        var a interface{}
        cache[index] = &a
    }

    for rows.Next() {
        rows.Scan(cache...)
        row := make(map[string]interface{})
        for i, val := range cache {

            // 处理数据类型
            v := *val.(*interface{})
            switch v.(type) {
            case []uint8:
                v = string(v.([]uint8))
            case nil:
                v = ""
            }
            row[cols[i]] = v
        }

        res = append(res, row)
    }

    return res
}