/// <summary>
        /// 读取校历Excel并保存到SQL
        /// </summary>
        /// <param name="fileName">服务器端Excel文件路径</param>
        /// <param name="identity">sql表名</param>
        /// <returns></returns>
        public static string ReadCalendarExcel(string fileName, string identity)
        {
            List <string> SheetName = new List <string>();

            SheetName = GetSheetName(fileName);
            string strSQL = "";

            if (SheetName[0] != "Sheet1$")
            {
                return("指定的Excel文件的工作表不为“Sheet1”,当前的表名为" + SheetName[0]);
            }
            strSQL = "select * from [Sheet1$]";
            ReadExcelToDataSet(fileName, strSQL);

            if (CheckExcelTableCalendar())
            {
                DataTable dt = ds.Tables["ExcelInfo"];
                // CalenderToSQLServer(identity);
                return(ExcelToSQLServer.DataTableToSQLServer(dt, identity, 3));
            }
            else
            {
                return("选择的Excel文件中的内容与数据与数据库中的要求不匹配,请确认!");
            }
        }
        /// <summary>
        /// 读取课程Excel并保存到SQL
        /// </summary>
        /// <param name="fileName"></param>
        /// <param name="identity"></param>
        /// <returns></returns>
        public static string ReadCoursesExcel(string fileName, string identity)
        {
            List <string> SheetName = new List <string>();

            SheetName = GetSheetName(fileName);
            string strSQL = "";

            if (SheetName[0] != identity + "$")
            {
                return("指定的Excel文件的工作表名不为" + identity + ",当前的表名为" + SheetName[0]);
            }
            strSQL = "select * from [" + SheetName[0] + "]";
            ReadExcelToDataSet(fileName, strSQL);

            if (CheckExcelTableCourses())
            {
                //CoursesTOSQLServer(identity);
                //在原表的基础上添加两列数据并指定添加的位置,使得与数据库目标表结构相同
                DataTable dt = ds.Tables["ExcelInfo"];
                dt.Columns.Add("TeacherID");
                dt.Columns["TeacherID"].SetOrdinal(1);
                dt.Columns.Add("TeacherName");
                dt.Columns["TeacherName"].SetOrdinal(2);

                dt.Columns.Add("CourseID");
                dt.Columns.Add("CourseName");
                dt.Columns["CourseID"].SetOrdinal(5);
                dt.Columns["CourseName"].SetOrdinal(6);
                for (int i = 0; i < dt.Rows.Count; i++)
                {
                    SplitToDataTable.SplitTeacherIDAndTeacherName(dt.Rows[i]);
                }
                //移除已经拆分完毕的列--任课教师
                dt.Columns.Remove(dt.Columns[3]);
                dt.Columns.Remove(dt.Columns[6]);


                return(ExcelToSQLServer.DataTableToSQLServer(DisposeDataTable(dt), "TabTeacherAllCourse", 21));
            }
            else
            {
                return("选择的Excel文件中的内容与数据库要求不匹配。请确认!");
            }
        }
 /// <summary>
 /// 将datat批量导入数据库,中转作用
 /// </summary>
 /// <param name="dt"></param>
 /// <param name="table"></param>
 /// <param name="num"></param>
 /// <returns></returns>
 public static string InsertForSql(DataTable dt, string table, int num)
 {
     return(ExcelToSQLServer.DataTableToSQLServer(dt, table, num));
 }