將TimeSpan屬性保留爲時間類型Mysql列的錯誤

Question

我有一個TimeSpan屬性，我想使用Nhibernate將它保存到數據庫中。 Mysql列類型是Time。我看周圍的

CustomType（ 「TimeAsTimeSpan」）

應該解決的問題，但它不。

session.Save（對象）

將導致以下個MySqlException

只有時間跨度目的可以通過MySqlTimeSpan錯誤

，即時通訊的時間戳屬性被序列化試圖堅持是一個有效的時間戳。任何sudggestions？

Answer 1

好，因爲沒有人回答我的問題，我嘗試了許多不同的方法，沒有結果，我決定去解決。我插入到varchar列時將我的timestamp對象轉換爲字符串Type（不再是時間類型），並且在從DB讀取時將字符串轉換回時間戳對象。以防萬一，這是轉換的代碼。

DateTime.Parse(startTimebtn.Text).TimeOfDay.ToString();

Answer 2

這是NHibernate的一個bug。我剛剛設法通過創建TimeAsTimeSpan類的克隆來解決這個問題。

用法：

CustomType(typeof(TimeAsTimeSpanTypeClone)); 

類：

using System; 
using System.Collections; 
using System.Collections.Generic; 
using System.Data; 
using NHibernate.Engine; 
using NHibernate.SqlTypes; 
using NHibernate.Type; 

namespace DataAccess.NhibernateFixes 
{ 
    /// <summary> 
    /// Clone of the Nhibernate class: NHibernate.Type.TimeAsTimeSpanType 
    /// This one actually works though... 
    /// </summary> 
    [Serializable] 
    public class TimeAsTimeSpanTypeClone : PrimitiveType, IVersionType, IType, ICacheAssembler 
    { 
     private static readonly DateTime BaseDateValue = new DateTime(1753, 1, 1); 

     public override string Name 
     { 
      get 
      { 
       return "TimeAsTimeSpan"; 
      } 
     } 

     public override System.Type ReturnedClass 
     { 
      get 
      { 
       return typeof(TimeSpan); 
      } 
     } 

     public IComparer Comparator 
     { 
      get 
      { 
       return (IComparer)Comparer<TimeSpan>.Default; 
      } 
     } 

     public override System.Type PrimitiveClass 
     { 
      get 
      { 
       return typeof(TimeSpan); 
      } 
     } 

     public override object DefaultValue 
     { 
      get 
      { 
       return (object)TimeSpan.Zero; 
      } 
     } 

     static TimeAsTimeSpanTypeClone() 
     { 
     } 

     public TimeAsTimeSpanTypeClone() 
      : base(SqlTypeFactory.Time) 
     { 
     } 

     public override object Get(IDataReader rs, int index) 
     { 
      try 
      { 
       object obj = rs[index]; 
       if (obj is TimeSpan) 
        return (object)(TimeSpan)obj; 
       else 
        return (object)((DateTime)obj).TimeOfDay; 
      } 
      catch (Exception ex) 
      { 
       throw new FormatException(string.Format("Input string '{0}' was not in the correct format.", rs[index]), ex); 
      } 
     } 

     public override object Get(IDataReader rs, string name) 
     { 
      try 
      { 
       object obj = rs[name]; 
       if (obj is TimeSpan) 
        return (object)(TimeSpan)obj; 
       else 
        return (object)((DateTime)obj).TimeOfDay; 
      } 
      catch (Exception ex) 
      { 
       throw new FormatException(string.Format("Input string '{0}' was not in the correct format.", rs[name]), ex); 
      } 
     } 

     public override void Set(IDbCommand st, object value, int index) 
     { 
      DateTime dateTime = TimeAsTimeSpanTypeClone.BaseDateValue.AddTicks(((TimeSpan)value).Ticks); 
      ((IDataParameter)st.Parameters[index]).Value = (object)dateTime.TimeOfDay; // <<<< fix here. Added ".TimeOfDay" 
     } 

     public override string ToString(object val) 
     { 
      return ((TimeSpan)val).Ticks.ToString(); 
     } 

     public object Next(object current, ISessionImplementor session) 
     { 
      return this.Seed(session); 
     } 

     public virtual object Seed(ISessionImplementor session) 
     { 
      return (object)new TimeSpan(DateTime.Now.Ticks); 
     } 

     public object StringToObject(string xml) 
     { 
      return (object)TimeSpan.Parse(xml); 
     } 

     public override object FromStringValue(string xml) 
     { 
      return (object)TimeSpan.Parse(xml); 
     } 

     public override string ObjectToSQLString(object value, NHibernate.Dialect.Dialect dialect) 
     { 
      return (string)(object)'\'' + (object)((TimeSpan)value).Ticks.ToString() + (string)(object)'\''; 
     } 
    } 
}