[英]Mapping enum with fluent nhibernate
我正在關注http://wiki.fluentnhibernate.org/Getting_started教程,用Fluent NHibernate創建我的第一個NHibernate項目
我有2張桌子
1)帳戶與字段
Id
AccountHolderName
AccountTypeId
2)帶有字段的AccountType
Id
AccountTypeName
現在,帳戶類型可以是Savings或Current所以表AccountTypes存儲2行1 - Savings 2 - Current
對於AccoutType表,我已經定義了枚舉
public enum AccountType {
Savings=1,
Current=2
}
對於Account表,我定義了實體類
public class Account {
public virtual int Id {get; private set;}
public virtual string AccountHolderName {get; set;}
public virtual string AccountType {get; set;}
}
流暢的nhibernate映射是:
public AgencyMap() {
Id(o => o.Id);
Map(o => o.AccountHolderName);
Map(o => o.AccountType);
}
當我嘗試運行解決方案時,它給出了一個異常 - InnerException = {“(XmlDocument)(2,4):XML驗證錯誤:命名空間'urn:nhibernate-mapping-2.2'中的元素'class'具有不完整的內容。期望的可能元素列表:'命名空間'中的元,子選擇,緩存,同步,注釋,tuplizer,id,composite-id'...
我想那是因為我還沒有為AccountType指定任何映射。
問題是:
謝謝!
以下顯然不再有效https://stackoverflow.com/a/503327/189412
這樣做怎么樣:
public AgencyMap() {
Id(o => o.Id);
Map(o => o.AccountHolderName);
Map(o => o.AccountType).CustomType<AccountType>();
}
自定義類型處理一切:)
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);
}
如果要覆蓋需要為其提供約定,Fluent NHibernate默認將枚舉值保存為字符串。 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
}
幾乎忘了您還需要將常規添加到您的流暢配置中。 您可以在添加映射的同一位置執行此操作:
.Mappings(m => m.FluentMappings.AddFromAssemblyOf<BillingRecordMap>()
.Conventions.AddFromAssemblyOf<EnumConvention>()
一個很好的方法是實現接口IUserType和Create一個CustomType以及寫入和讀取的規則,這是布爾的一個例子:
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>();
這是一個示例,但您可以使用其他類型。
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