在NHibernate中支持UINt32

Question

我正在尝试在我的application.By looking示例中支持UInt32，我写了我的代码。NHibernate - How to store UInt32 in database。在我的hbm文件中，我定义了属性标签：

           <property name="Uint16Var" column="Uint16Var" 
           type="datatypeSupported.UInt32Type,  datatypeSupported"  />

我还像这样定义了一个UInt32Type类：

     using System;
     using NHibernate;
     using NHibernate.SqlTypes;
     using NHibernate.UserTypes;

    namespace datatypeSupported
    {
     public class UInt32Type : IUserType
    {

    public object NullSafeGet(System.Data.IDataReader rs, string[] names, object owner)
    {
        int? i = (int?)NHibernateUtil.Int32.NullSafeGet(rs, names[0]);
        return (UInt32?)i;
    }

    public void NullSafeSet(System.Data.IDbCommand cmd, object value, int index)
    {
        UInt32? u = (UInt32?)value;
        int? i = (Int32?)u;
        NHibernateUtil.Int32.NullSafeSet(cmd, i, index);  
    }

    public Type ReturnedType
    {
        get
        {
            return typeof(Nullable<UInt32>);
        }
    }

    public SqlType[] SqlTypes
    {
        get
        {
            return new SqlType[] { SqlTypeFactory.Int32 };
        }
    } public object Assemble(object cached, object owner) 
    { 
        return cached; 
    } 

    public object DeepCopy(object value)
    { 
        return value;
    } 

    public object Disassemble(object value) 
    {
        return value; 
    } 

    public int GetHashCode(object x) 
    { 
        return x.GetHashCode(); 
    }

    public bool IsMutable
    {
        get { return false; }
    } 

    public object Replace(object original, object target, object owner) 
    { 
        return original; 
    } 

    public new bool Equals(object x, object y) 
    { 
        return x != null && x.Equals(y);
    }
}

}

但是，当我试图保存我的实体时，它给出了一个错误“方言不支持DbType.UInt32".What类型的更改我需要做吗？

Answer 1

编写一个支持UInt32类型的自定义方言。根据您正在使用的数据库，从一种已知的方言继承。也就是说，对于SQL Server，您可以拥有如下内容：

public class CustomMsSqlDialect : MsSql2008Dialect
{
    protected override void RegisterNumericTypeMappings()
    {
        base.RegisterNumericTypeMappings();
        RegisterColumnType(DbType.UInt32, "INT");
    }
}

要向FluentNHibernate注册方言：

Fluently.Configure().Database(
    MsSqlConfiguration.MsSql2008.Dialect<CustomMsSqlDialect>()...)

使用XML：

<property name="dialect">CustomMsSqlDialect, AssemblyName</property>