Question

EF SqlQuery 是否具有Dapper中的多映射功能？

EF联接查询结果并不像我预期的那样。

示例：

型号：

public class Tlb
{
    [Key]
    public int TlbId { get; set; }
    public bool IsPublished { get; set; }
    public virtual ICollection<TlbAttachment> Attachments { get; set; }
    public virtual ICollection<TlbAttachment> OtherCollection1 { get; set; }
    public virtual ICollection<TlbAttachment> OtherCollection2 { get; set; }
}

public class TlbAttachment
{
    [Key, Column(Order = 0)]
    public int AttachmentId { get; set; }

    [ForeignKey("AttachmentId")]
    public virtual Attachment Attachment { get; set; }

    [Key, Column(Order = 1)]
    public int TlbId { get; set; }

    [ForeignKey("TlbId")]
    public virtual Tlb Tlb { get; set; }
}

public class Attachment
{
    [Key]
    public int AttachmentId { get; set; }
    public int Type { get; set; }
}

数据库访问：

const string query = "SELECT * " +
                     "FROM Tlb AS t LEFT OUTER JOIN "+
                     "TlbAttachment AS at ON at.TlbId = t.TlbId LEFT OUTER JOIN "+
                     "Attachment AS a ON a.AttachmentId = at.AttachmentId " +
                     "WHERE t.IsPublished = 1 AND a.Type = 0";

return _DbContext.Database.SqlQuery<Model.Tlb>(query);

SqlQuery的结果不包含Attachments，我不想获得OtherCollection1和OtherCollection2。在Dapper看来你可以改变它的映射。在 Web API 中使用Include，将在延迟加载模式下调用OtherCollection1和OtherCollection2。而且我不需要它们。

Answer 1

如果您需要该功能来加载关联，那么EF可以使用Include方法获得内置支持。否则，没有用于多映射的功能。

EF SqlQuery多映射

1 个答案: