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不及格的程序员-八神

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由于数据库中DateTime类型字段,最小值是1/1/1753 12:00:00,而.NET Framework中,DateTime类型,最小值是1/1/0001 0:00:00,显然,超出了sql的值的最小值范围,导致数据溢出错误

using System.Data.SqlTypes;
namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine(".net最小时间为{0}",DateTime.MinValue.ToString());
            Console.WriteLine(".net最大时间为{0}",DateTime.MaxValue.ToString());
            Console.WriteLine("SQL最小时间为{0}",SqlDateTime.MinValue.ToString());
            Console.WriteLine("SQL最大时间为{0}",SqlDateTime.MaxValue.ToSqlString());
            Console.ReadKey();
        }
    }
}
try
                {
                    using (System.Data.SqlClient.SqlCommand cmd = new System.Data.SqlClient.SqlCommand())
                    {
                        cmd.Connection = sqlConn;
                        cmd.CommandType = CommandType.Text;
                        cmd.CommandText = "insert into tCollectionLog (iID_tControlNodes, cNodeName, cValue, cQuality, iType, cReturnInfo, dOPC)values(@iID_tControlNodes, @cNodeName, @cValue, @cQuality, @iType, @cReturnInfo, @dOPC)";
                        cmd.Parameters.AddWithValue("@iID_tControlNodes", iID_tControlNodes);
                        cmd.Parameters.AddWithValue("@cNodeName", item.ItemName);
                        cmd.Parameters.AddWithValue("@cValue", item.Value == null ? DBNull.Value : item.Value);//没有值时出错;参数化查询 '(@iID_tControlNodes nvarchar(36),@cNodeName nvarchar(13),@cValue' 需要参数 '@cValue',但未提供该参数。
                        cmd.Parameters.AddWithValue("@cQuality", string.Format("{0}", item.Quality));
                        cmd.Parameters.AddWithValue("@iType", type == OPCDataType.CURRENTTAG ? 1:2);
                        cmd.Parameters.AddWithValue("@cReturnInfo", item.ResultID.ToString());
                        cmd.Parameters.AddWithValue("@dOPC", item.Quality == Quality.Bad ? DBNull.Value : (object)item.Timestamp);
                        cmd.ExecuteNonQuery();
                    }
                }
                catch(Exception ex)
                {
                    IoriUtilityLib.Iori.LogUtil.logError(string.Format("InsertOPCReadLog:{0}" , ex.Message));
                }

 

 

posted on 2023-11-10 10:50  不及格的程序员-八神  阅读(384)  评论(0编辑  收藏  举报