Question

我正在开发一个Web应用程序，该应用程序可以显示Oracle数据库中的数据。

例如，如果我需要显示零件，则需要以下关系：

Parts have 0-1 AdditionalInformations
Parts have 0-1 ReferencePart
Parts have 1   Type 
Parts have 1-* Tasks
Parts have 0-* Locations

此外：

AdditionalInformations have 0-* Users
And Locations          have 1   AdditionalLocationInfo

所以我想从db获取一个Part，配置上下文，然后再显示包括前面提到的关系的Part。

我将EntityFramework 6和LINQ一起用于查询。还有一个ORACLE 12c数据库来保存数据

var query = from part in _dbcontext.Part.AsNoTracking()
            where part.Id == partId
            select part;
return query
        .Include(p => p.Type)
        .Include(p => p.AdditionalInformations.Users)
        .Include(p => p.ReferencePart)
        .Include(p => p.Locations.Select(l => l.AdditionalLocationInfo))
        .Include(p => p.Tasks)
        .SingleOrDefault();

可悲的是，这给了我ORA-01790例外...
如果我使用更少的包含，它将起作用！：

var query = from part in _dbcontext.Part.AsNoTracking()
            where part.Id == partId
            select part;
return query
        .Include(p => p.Type)
        .Include(p => p.Locations.Select(l => l.AdditionalLocationInfo))
        .SingleOrDefault();


var query = from part in _dbcontext.Part.AsNoTracking()
            where part.Id == partId
            select part;
return query
        .Include(p => p.Type)
        .Include(p => p.AdditionalInformations.Users)
        .Include(p => p.ReferencePart)
        .SingleOrDefault();

但是，我需要所有关系...

所以请给我有关如何解决此问题的意见：）谢谢！

通过EF6和LINQ从Oracle DB接收相关实体

0 个答案: