映射枚举与功能NHibernate(Mapping enum with fluent nhibern

2019-07-19 18:51发布

我下面的http://wiki.fluentnhibernate.org/Getting_started教程与功能NHibernate创建我的第一个项目的NHibernate

我有2个表

1)字段帐户

Id
AccountHolderName
AccountTypeId

2)用ACCOUNTTYPE字段

Id
AccountTypeName

眼下账户类型可以是储蓄或电流,使表AccountTypes店2行1 - 2储蓄 - 当前

对于AccoutType表我已经定义枚举

public enum AccountType {
    Savings=1,
    Current=2
}

对于帐户表我定义的实体类

public class Account {
    public virtual int Id {get; private set;}
    public virtual string AccountHolderName {get; set;}
    public virtual string AccountType {get; set;}
}

该功能NHibernate映射是:

public AgencyMap() {
    Id(o => o.Id);
    Map(o => o.AccountHolderName);
    Map(o => o.AccountType);
}

当我尝试运行解决方案,它提供了一个异常 - 的InnerException = {“(XmlDocument的)(2,4):XML验证错误:元素‘类’在命名空间‘瓮:NHibernate的映射-2.2’具有不完整的内容。可能元素的列表预计:“元,子查询,高速,同步,评论,的tuplizer,ID,复合ID”命名空间“UR ...

我想这是因为我还没有speciofied为ACCOUNTTYPE任何映射。

这些问题是:

  1. 我如何使用ACCOUNTTYPE枚举,而不是ACCOUNTTYPE类的?
  2. 也许我会在错误的轨道。 有一个更好的方法吗?

谢谢!

Answer 1:

下面显然不再适用https://stackoverflow.com/a/503327/189412

如何只这样做:

public AgencyMap() {
    Id(o => o.Id);
    Map(o => o.AccountHolderName);
    Map(o => o.AccountType).CustomType<AccountType>();
}

自定义类型处理一切:)



Answer 2:

public class Account {
    public virtual int Id {get; private set;}
    public virtual string AccountHolderName {get; set;}
    public virtual AccountType AccountType {get; set;}
}

public AgencyMap() {
    Id(o => o.Id);
    Map(o => o.AccountHolderName);
    Map(o => o.AccountType);
}

功能NHibernate如果你想越过你需要提供一个约定将其保存枚举值作为默认字符串。 就像是:

public class EnumConvention :
    IPropertyConvention, 
    IPropertyConventionAcceptance
{
    #region IPropertyConvention Members

    public void Apply(IPropertyInstance instance)
    {
        instance.CustomType(instance.Property.PropertyType);
    }

    #endregion

    #region IPropertyConventionAcceptance Members

    public void Accept(IAcceptanceCriteria<IPropertyInspector> criteria)
    {
        criteria.Expect(x => x.Property.PropertyType.IsEnum ||
        (x.Property.PropertyType.IsGenericType && 
         x.Property.PropertyType.GetGenericTypeDefinition() == typeof(Nullable<>) &&
         x.Property.PropertyType.GetGenericArguments()[0].IsEnum)
        );
    }

    #endregion
}

差点忘了,你需要的约定添加到您流畅的配置也是如此。 你这样做,在同一个地方,你添加映射:

.Mappings(m => m.FluentMappings.AddFromAssemblyOf<BillingRecordMap>()
.Conventions.AddFromAssemblyOf<EnumConvention>()


Answer 3:

一个伟大的方式做到这一点,是实现接口IUserType和创建的规则CustomType写入和读取,that'sa例如布尔:

 public class CharToBoolean : IUserType
{
    public SqlType[] SqlTypes => new[] { NHibernateUtil.String.SqlType };

    public Type ReturnedType => typeof(bool);

    public bool IsMutable =>true;

    public object Assemble(object cached, object owner)
    {
        return (cached);
    }

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

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

    public new bool Equals(object x, object y)
    {
        if (ReferenceEquals(x, y)) return true;

        var firstObject = x as string;
        var secondObject = y as string;

        if (string.IsNullOrEmpty(firstObject) || string.IsNullOrEmpty(secondObject)) return false;

        if (firstObject == secondObject) return true;
        return false;
    }

    public int GetHashCode(object x)
    {
        return ((x != null) ? x.GetHashCode() : 0);
    }

    public object NullSafeGet(IDataReader rs, string[] names, object owner)
    {
        var obj = NHibernateUtil.String.NullSafeGet(rs, names[0]);

        if (obj == null) return null;

        var value = (string)obj;

        return value.ToBoolean();
    }

    public void NullSafeSet(IDbCommand cmd, object value, int index)
    {
        if(value != null)
        {
            if ((bool)value)
            {
                ((IDataParameter)cmd.Parameters[index]).Value = "S";
            }
            else
            {
                ((IDataParameter)cmd.Parameters[index]).Value = "N";
            }
        }
        else
        {
            ((IDataParameter)cmd.Parameters[index]).Value = DBNull.Value;
        }
    }
    public object Replace(object original, object target, object owner)
    {
        return original;
    }
}

}

映射:

  this.Map(x => x.DominioGenerico).Column("fldominiogen").CustomType<CharToBoolean>();

It'sa样品,不过你可以用其他类型的做到这一点。



文章来源: Mapping enum with fluent nhibernate