添加项目文件。

Epost.DAL/HistoryDataDAL.cs

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+using System;
+using System.Collections.Generic;
+using System.Data;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Epost.DAL
+{
+    public class HistoryDataDAL
+    {
+         DataBaseOpration.OprationSqlDAL db = DB_DLL.GetInstance();
+
+        #region 删除表名
+        public bool DeleteTable(string table)
+        {
+            //执行删除语句
+            string sql = "";
+            if (table == "Ordershis")
+            {
+                sql = "delete from Ordershis where state!=3";
+            }
+            else
+            {
+                sql = "delete from {0}";
+                sql = string.Format(sql, table);
+            }
+
+
+            //如果表中数据为空
+            string sql1 = "select count(*) from {0}";
+            sql1 = string.Format(sql1, table);
+            DataTable dt = db.GetsqlForDT(sql1);
+            int y = Convert.ToInt32(dt.Rows[0][0].ToString());
+            if (y == 0)
+            {
+                return true;
+            }
+            else
+            {
+                int x = db.InsertSql(sql);
+                if (x > 0)
+                {
+                    return true;
+                }
+                else
+                {
+                    return false;
+                }
+            }
+
+
+
+
+        }
+        #endregion
+
+
+        #region 保存删除时间(数据库数据)
+        public bool SaveTime(String table, string date)
+        {
+            int x = -1;
+            string sql = "alter proceduce proceduce_delete " +
+                "as delete from {0} where {1}<DATEADD(DAY,{2} GETDATE()) go " +
+                "Execute proceduce_delete";
+            if (table == "Error")
+            {
+                sql = string.Format(sql, table, "date", Convert.ToInt32(date) * (-1), "GETDATE()");
+            }
+            else if (table == "Orders")
+            {
+                sql = string.Format(sql, table, "downdate", Convert.ToInt32(date) * (-1), "GETDATE()");
+            }
+            //GetsqlForDT
+            x = db.InsertSql(sql);
+            if (x != -1)
+            {
+                return true;
+            }
+            else
+            {
+                return false;
+            }
+
+
+        }
+        #endregion
+
+
+        #region 查询历史数据
+        public DataTable HistoryData()
+        {
+            string sql = "exec sys_viewtablespace";
+
+            DataTable dt = db.GetsqlForDT(sql);
+            return dt;
+        }
+        #endregion
+    }
+}