using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace FCOMMON
{
    public static class DBM
    {
        private static System.Data.SqlClient.SqlConnection getCn()
        {
            string cs = FCOMMON.info.CS;
            System.Data.SqlClient.SqlConnection cn = new System.Data.SqlClient.SqlConnection();
            cn.ConnectionString = cs;
            return cn;
        }

        public struct sItemInfo
        {
            public int idx;
            public string sid;
            public string model;
            public string supply;
        }

        public static sItemInfo getItemInfo(int idx)
        {
            var cn = getCn();
            cn.Open();

            var retval = new sItemInfo();
            retval.idx = -1;

            string sql = "select * from Items where idx = " + idx.ToString();
            var cmd = new System.Data.SqlClient.SqlCommand(sql, cn);
            var rdr = cmd.ExecuteReader();
            while(rdr.Read())
            {
                retval.idx = (int)rdr["idx"];
                if(rdr["sid"] != DBNull.Value) retval.sid = rdr["sid"].ToString();
                if (rdr["model"] != DBNull.Value) retval.model = rdr["model"].ToString();
                if (rdr["supply"] != DBNull.Value) retval.supply = rdr["supply"].ToString();
            }

            cn.Close();
            cn.Dispose();
            return retval;
        }

        public static List<String> getGroupList(string GroupColumn, string table, string where = "",Boolean desc=false)
        {
            List<string> retval = new List<string>();
            var cn = getCn();
            cn.Open();
            var sql = "select {0} " +
                " from {1} " +
                " where isnull({0},'') != '' ";

            if (where != "") sql += " and " + where;

            sql += " group by {0} " +
                   " order by {0} ";
            if (desc) sql += " desc";

            sql = string.Format(sql, "[" + GroupColumn + "]", table);
            var cmd = new System.Data.SqlClient.SqlCommand(sql, cn);
            var rdr = cmd.ExecuteReader();
            while (rdr.Read())
            {
                retval.Add(rdr[0].ToString());
            }
            cmd.Dispose();
            cn.Close();
            cn.Dispose();
            return retval;
        }
        public static List<String> getDateList(string table, string where = "",Boolean desc =false)
        {
            return getGroupList("pdate", table, where,desc);
        }
    }
}