检测空值，以及会不会出现mapping类型不一致的问题

   /// <summary>
        /// 检测空值，以及会不会出现mapping类型不一致的问题
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="nullsb1"></param>
        /// <param name="errorsb"></param>
        public static void CheckHibernateMappingType<T>(out StringBuilder nullsb1,out StringBuilder errorsb) where T:Framework.Domain.Entity,new()
        {
            nullsb1 = new StringBuilder();
            errorsb = new StringBuilder();
            var ctx = Spring.Context.Support.ContextRegistry.GetContext();
            var Dao = GetDao();
            var mapping = ((Spring.Data.NHibernate.LocalSessionFactoryObject)ctx.GetObject("&SessionFactory")).Configuration.GetClassMapping(typeof(T));
            var pmap = mapping.PropertyIterator;
            var tableName1 = mapping.Table.Name;
            var table = Dao.ExecuteDataSet(new QueryInfo() { CustomSQL = "select * from " + tableName1 }).Tables[0];
            Hashtable columnsType = new Hashtable();
            foreach (DataColumn col in table.Columns)
            {
                columnsType.Add(col.ColumnName, col.DataType.Name);
            }
            string primaryKey = ((NHibernate.Mapping.Column)(mapping.Key.ColumnIterator.FirstOrDefault())).Name;
            StringBuilder sb = new StringBuilder();
            StringBuilder sb1 = new StringBuilder();
            foreach (DataRow dr in table.Rows)
            {
                foreach (var item in pmap)
                {
                    NHibernate.Mapping.Column c = (NHibernate.Mapping.Column)item.ColumnIterator.FirstOrDefault();



                    //1对多的属性如children没有对应的列
                    if (c != null)
                    {
                        string columnTypeName = columnsType[c.Name].ToString();
                        try
                        {
                            if (dr[c.Name] is DBNull)
                            {
                                nullsb1.Append("主键" + dr[primaryKey].ToString() + "列" + c.Name + "约定类型为:" + columnTypeName + "值为:NULL\r\n");
                                continue;
                            }
                            switch (columnTypeName)
                            {
                                case "String":

                                    break;
                                case "Int16":
                                    Convert.ToInt16(dr[c.Name]);
                                    break;
                                case "Int32":
                                    Convert.ToInt32(dr[c.Name]);
                                    break;
                                case "Int64":
                                    Convert.ToInt64(dr[c.Name]);
                                    break;

                                case "Decimal":
                                    Convert.ToDecimal(dr[c.Name]);
                                    break;
                                case "DateTime":

                                    Convert.ToDateTime(dr[c.Name]);
                                    break;
                                case "Boolean":
                                case "bool":
                                    Convert.ToBoolean(dr[c.Name]);
                                    break;
                                default:
                                    break;
                            }
                        }
                        catch (Exception ex)
                        {

                            sb.Append("主键" + dr[primaryKey].ToString() + "列" + c.Name + "约定类型为:" + columnTypeName + "值为:" + dr[c.Name] + "??类型转换异常\r\n");
                        }


                    }
                }
            }
        }