public EntityPropertyMeta CreateExtensionPropertyMeta(IManagedProperty mp, EntityMeta em)
{
var epm = new EntityPropertyMeta()
{
Owner = em,
Runtime = new ManagedPropertyRuntime(mp),
PropertyType = mp.PropertyType,
ManagedProperty = mp,
};
em.EntityProperties.Add(epm);
return(epm);
}
/// <summary>
/// 开始指定某个属性直接映射字段的详细信息
/// </summary>
/// <param name="meta"></param>
/// <returns></returns>
public static ColumnMeta MapColumn(this EntityPropertyMeta meta)
{
if (meta.ManagedProperty is IRefEntityProperty)
{
throw new InvalidOperationException(string.Format(
"引用实体属性 {0} 不能映射数据库，请使用相应的 id 属性。", meta.Name
));
}
if (meta.ColumnMeta == null)
{
meta.ColumnMeta = new ColumnMeta();
}
return(meta.ColumnMeta);
}
private EntityPropertyMeta CreateEntityPropertyMeta(IManagedProperty mp, EntityMeta entityMeta)
{
var propertyType = mp.PropertyType;
if (mp == EntityConvention.Property_Id)
{
propertyType = entityMeta.IdType;
}
else if (mp == EntityConvention.Property_TreePId)
{
propertyType = entityMeta.IdType;
if (!propertyType.IsClass)
{
propertyType = typeof(Nullable <>).MakeGenericType(entityMeta.IdType);
}
}
var item = new EntityPropertyMeta
{
Owner = entityMeta,
Runtime = new ManagedPropertyRuntime(mp),
PropertyType = propertyType,
ManagedProperty = mp
};
#region 创建 ReferenceInfo 及聚合子类
var refMP = mp as IRefEntityProperty;
if (refMP != null)
{
var ri = new ReferenceInfo()
{
RefEntityProperty = refMP
};
this.CreateReference(ri, entityMeta);
item.ReferenceInfo = ri;
}
#endregion
entityMeta.EntityProperties.Add(item);
return(item);
}
/// <summary>
/// 找到实体中对应聚合关系中的父实体引用属性元数据。
///
/// 注意，此函数返回的是引用实体属性，而非引用 Id 属性。
/// </summary>
/// <returns></returns>
public EntityPropertyMeta FindParentReferenceProperty()
{
if (!_parentPropertyCacheLoaded)
{
var result = this.EntityProperties
.Where(p => p.ReferenceInfo != null && p.ReferenceInfo.Type == ReferenceType.Parent).ToArray();
if (result.Length > 1)
{
throw new InvalidOperationException(string.Format("类 {0} 中定义了两个父引用属性。（一个类中只能定义一个父引用属性。）", this.Name));
}
_parentPropertyCache = result.Length > 0 ? result[0] : null;
_parentPropertyCacheLoaded = true;
}
return(_parentPropertyCache);
}
/// <summary>
/// 指定某个属性是否需要直接映射字段
/// </summary>
/// <param name="meta"></param>
/// <returns></returns>
public static EntityPropertyMeta DontMapColumn(this EntityPropertyMeta meta)
{
meta.ColumnMeta = null;
return(meta);
}
