ATJ_MES_ZY/Equips/Mesnac.Math.~/Mesnac.Math.Feeding/WeightInfoList.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Mesnac.Maths;
using System.Data;
using Mesnac.Equips;
using System.Data.Common;
using System.Data.SqlClient;
using System.IO;
using System.Xml.Serialization;

namespace Mesnac.Math.Feeding
{
    /// <summary>
    /// 称量信息列表
    /// </summary>
    public class WeightInfoList : IMath
    {
        private object NullResult = new DataTable();

        public string Name
        {
            get { return "称量信息"; }
        }

        public string Caption
        {
            get
            {
                StringBuilder sb = new StringBuilder();
                sb.AppendLine("必须填写使用数据库连接的设备名称");
                sb.AppendLine("例：");
                sb.Append("    ").Append(Name).AppendLine("(A1)");
                return sb.ToString();
            }
        }

        public object Execute(string[] parameters, object[] buff)
        {
            string id = string.Empty;
            if ((buff.Length > 0)
                && (buff[0] != null)
                && (!string.IsNullOrWhiteSpace(buff[0].ToString())))
            {
                id = buff[0].ToString();
            }
            if (string.IsNullOrWhiteSpace(id))
            {
                return this.NullResult;
            }
            if (parameters.Length < 1)
            {
                return this.NullResult;
            }
            string equipName = parameters[0];
            BaseEquip equip = null;
            if (!Mesnac.Equips.Factory.Instance.AllEquips.TryGetValue(equipName, out equip))
            {
                return this.NullResult;
            }
            DataTable Result = new DataTable();
            string xml = string.Empty;
            try
            {
                DbConnection conn = equip.Main.ConnType.Connection as DbConnection;
                if (conn == null)
                {
                    return this.NullResult;
                }
                using (SqlConnection sqlCon = new SqlConnection(conn.ConnectionString))
                {
                    sqlCon.Open();

                    SqlCommand sqlcmd = new SqlCommand();
                    sqlcmd.Connection = sqlCon;
                    sqlcmd.CommandType = System.Data.CommandType.Text;
                    string sqlstr = "SELECT ssValue FROM SysKeyValue WHERE ssKey='RecipeCache_WeightListTable'";
                    sqlcmd.CommandText = sqlstr;
                    object obj = sqlcmd.ExecuteScalar();
                    if (obj != null && obj != DBNull.Value)
                    {
                        xml = obj.ToString();
                    }
                    sqlCon.Close();
                    if (string.IsNullOrWhiteSpace(xml))
                    {
                        return this.NullResult;
                    }
                }
                #region 旧代码，在多线程并发访问数据库时，容易产生DataReader未关闭错误
                //bool isOpen = true;
                //if (conn.State != ConnectionState.Open)
                //{
                //    isOpen = false;
                //    conn.Open();
                //}


                //DbCommand sqlcmd = conn.CreateCommand();

                //sqlcmd.CommandType = System.Data.CommandType.Text;
                //string sqlstr = "SELECT ssValue FROM SysKeyValue WHERE ssKey='RecipeCache_WeightListTable'";
                //sqlcmd.CommandText = sqlstr;
                //object obj = sqlcmd.ExecuteScalar();
                //string xml = string.Empty;
                //if (obj != null && obj != DBNull.Value)
                //{
                //    xml = obj.ToString();
                //}
                //sqlcmd.Dispose();
                //if (!isOpen)
                //{
                //    conn.Close();
                //}
                //if (string.IsNullOrWhiteSpace(xml))
                //{
                //    return this.NullResult;
                //}
                #endregion
                Result = DeserializeObject<DataTable>(xml);
                //ICSharpCode.Core.LoggingService.Debug("函数（称量信息）：" + Result.Rows.Count);
            }
            catch (Exception ex)
            {
                ICSharpCode.Core.LoggingService.Error("发生错误在Mesnac.Math.Fedding.WeightInfoList：" + ex.Message, ex);
            }
            Result.TableName = String.Format("T_WeightInfoList_{0}", Guid.NewGuid().ToString());
            return Result;
        }

        /// <summary>
        /// 把xml字符串反序列化为对象
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="xmlString"></param>
        /// <returns></returns>
        private T DeserializeObject<T>(string xmlString)
        {
            if (!String.IsNullOrEmpty(xmlString))
            {
                StringReader strReader = new StringReader(xmlString);
                XmlSerializer serializer = new XmlSerializer(typeof(T));
                T obj = (T)serializer.Deserialize(strReader);
                strReader.Close();
                strReader.Dispose();
                return obj;
            }
            else
            {
                return default(T);
            }
        }
    }
}