我使用NHibernate和Postgresql作为后端,必须创建用于将System.DateTime转换为Postgresql“time”类型以及将System.timepans转换为“interval”db类型的自定义类型。我创建的IUserType正在工作,并且正在应用于读取和更新,但当我试图将对象插入数据库时,它们从未应用。我已经在IUserTypes中设置了断点,但是在发生插入时它们永远不会被命中。
我认为问题可能在于对象只是一个POCO对象,还不是代理,所以当我设置属性值时,应用转换到usertype的映射不会发生。
如果我执行更新并设置这些属性之一,我可以看到IUserType中的断点被触发。
有什么想法吗?
更新
正在调用IUserType的Equals方法,但我在其中进行必要转换的NullSafeSet不是。
编辑
添加了代码示例
public class TimeType : BaseImmutableUserType<TimeSpan>
{
public override object NullSafeGet(IDataReader rs, string[] names, object owner)
{
var val = NHibernateUtil.Time.NullSafeGet(rs, names[0]);
if (val == null)
return null;
var dt = DateTime.Parse(val.ToString());
return new TimeSpan(0, dt.Hour, dt.Minute, dt.Second);
}
public override void NullSafeSet(IDbCommand cmd, object value, int index)
{
var obj = (TimeSpan)value;
((IDbDataParameter) cmd.Parameters[index]).Value = obj;
}
public override SqlType[] SqlTypes
{
get
{
return new[] { SqlTypeFactory.Time };
}
}
}
public abstract class BaseImmutableUserType<T> : IUserType
{
public abstract object NullSafeGet(IDataReader rs, string[] names, object owner);
public abstract void NullSafeSet(IDbCommand cmd, object value, int index);
public abstract SqlType[] SqlTypes { get; }
public BaseImmutableUserType()
{
int i = 0;
}
public new bool Equals(object x, object y)
{
if (ReferenceEquals(x, y))
{
return true;
}
if (x == null || y == null)
{
return false;
}
return x.Equals(y);
}
public int GetHashCode(object x)
{
return x.GetHashCode();
}
public object DeepCopy(object value)
{
return value;
}
public object Replace(object original, object target, object owner)
{
return original;
}
public object Assemble(object cached, object owner)
{
return DeepCopy(cached);
}
public object Disassemble(object value)
{
return DeepCopy(value);
}
public Type ReturnedType
{
get { return typeof(T); }
}
public bool IsMutable
{
get { return false; }
}
}
最佳答案
我找到了以下两个选项:
选项1:不要使用自己的用户类型。相反,使用NHibernate自己的TimeAsTimeSpan如下:
Map(x => x.TimeFrom)
.CustomType("TimeAsTimeSpan");
(示例取自here)
选项2:稍微修改类:
public class TimeType : BaseImmutableUserType<TimeSpan>
{
// this is taken from the source of NHibernate.Type.TimeAsTimeSpanType
private static readonly DateTime BaseDateValue = new DateTime(1753, 01, 01);
public override object NullSafeGet(IDataReader rs, string[] names, object owner)
{
var val = NHibernateUtil.TimeAsTimeSpan.NullSafeGet(rs, names[0]);
if (val == null)
return null;
var dt = DateTime.Parse(val.ToString());
return new TimeSpan(0, dt.Hour, dt.Minute, dt.Second);
}
public override void NullSafeSet(IDbCommand cmd, object value, int index)
{
//var obj = (TimeSpan)value; // we can't use TimeSpan here but need to use DateTime
// this is taken from the source of NHibernate.Type.TimeAsTimeSpanType
DateTime date = BaseDateValue.AddTicks(((TimeSpan)value).Ticks);
((IDbDataParameter)cmd.Parameters[index]).Value = date;
}
public override SqlType[] SqlTypes
{
get
{
return new[] { NHibernate.SqlTypes.SqlTypeFactory.Time };
}
}
}