强制流利的休眠加入正确的列？答案

【问题标题】：Force fluent-nhibernate join on correct column?强制流利的休眠加入正确的列？
【发布时间】：2014-12-19 15:25:50
【问题描述】：

使用这些实体时：

[AS400Entity]
public class AuthItemEntity
{
    public virtual decimal Upc { get; set; }
    public virtual string VendorItemCode { get; set; }
    public virtual int Vendor { get; set; }
    public virtual int ProductVendorNumber { get; set; }
    public virtual string Description { get; set; }
    public virtual DateTime AddDate { get; set; }
    public virtual DateTime VendorDiscontinueDate { get; set; }

    public virtual VendorMasterEntity VendorMaster { get; set; }
}

[AS400Entity]
public class VendorMasterEntity
{
    public virtual int CompanyNumber { get; set; }
    public virtual int Vendor { get; set; }
    public virtual CompNamesEntity CompNames { get; set; }
    public virtual IList<AuthItemEntity> AuthItems { get; set; }
}

[AS400Entity]
public class CompNamesEntity
{
    public virtual int CompanyNumber { get; set; }
    public virtual string CompanyName { get; set; }
    public virtual IList<VendorMasterEntity> VendorMasts { get; set; }
}

还有这个映射：

public class AuthItemEntityMapping : ClassMap<AuthItemEntity>
{
    public AuthItemEntityMapping()
    {
        Table("AUTHITEM");
        Id(entity => entity.Vendor, "ITEM_VENDOR");
        Map(entity => entity.ProductVendorNumber, "PRODUCT_VENDOR");
        Map(model => model.Upc, "ITEM_UPC");
        Map(model => model.VendorItemCode, "VENDOR_ITEM_CODE");
        Map(model => model.Vendor, "ITEM_VENDOR");
        Map(model => model.Description, "ITEM_DESCRIPTION");
        Map(model => model.AddDate, "ADD_DATE").CustomType("Date");
        Map(model => model.VendorDiscontinueDate, "VENDOR_DISCONTINUE_DATE").CustomType("Date");

        HasOne(entity => entity.VendorMaster).Fetch.Join().ForeignKey("ITEM_VENDOR");
    }
}

public class VendorMasterEntityMap : ClassMap<VendorMasterEntity>
{
    public VendorMasterEntityMap()
    {
        Table("VENDMAST");

        Id(entity => entity.Vendor, "ITEM_VENDOR");
        Id(entity => entity.CompanyNumber, "COMPANY_NUMBER");

        HasOne(entity => entity.CompNames).Fetch.Join().ForeignKey("COMPANY_NUMBER");

        HasMany(entity => entity.AuthItems).Cascade.All();
    }
}

public class CompNamesEntityMap : ClassMap<CompNamesEntity>
{
    public CompNamesEntityMap()
    {
        Table("COMPNAMES");
        Id(entity => entity.CompanyNumber, "COMPANY_NUMBER");
        Map(entity => entity.CompanyName, "COMPANY_NAME");

        HasMany(entity => entity.VendorMasts).Cascade.All();
    }
}

我得到了这个 SQL：

SELECT this_.ITEM_VENDOR as ITEM1_3_2_, this_.PRODUCT_VENDOR as PRODUCT2_3_2_, this_.ITEM_UPC as ITEM3_3_2_, this_.VENDOR_ITEM_CODE as VENDOR4_3_2_, this_.ITEM_DESCRIPTION as ITEM5_3_2_, this_.ADD_DATE as ADD6_3_2_, this_.VENDOR_DISCONTINUE_DATE as VENDOR7_3_2_, vendormast2_.COMPANY_NUMBER as COMPANY1_5_0_, compnamese3_.COMPANY_NUMBER as COMPANY1_4_1_, compnamese3_.COMPANY_NAME as COMPANY2_4_1_ 
FROM AUTHITEM this_ 
    left outer join VENDMAST vendormast2_ on this_.ITEM_VENDOR=vendormast2_.COMPANY_NUMBER <-- should be item_vendor
    left outer join COMPNAMES compnamese3_ on vendormast2_.COMPANY_NUMBER=compnamese3_.COMPANY_NUMBER WHERE this_.ITEM_UPC = ? and this_.VENDOR_DISCONTINUE_DATE = ?

这只是一个远离正确的属性引用。

请注意：我在所有地方都使用 HasOne()，因为我不能进行这种延迟加载，它必须在查询时加载。

【问题讨论】：

标签： c# nhibernate fluent-nhibernate db2-400

【解决方案1】：

截至 2014 年 12 月，您仍然无法解决此问题：

https://github.com/jagregory/fluent-nhibernate/issues/272

这是有道理的因为它是一个 ORM，我们试图在没有正确强制关系的数据库上使用它（缺少键，但数据以这种方式运行）。

这个问题迫使我的公司完全放弃了 NHibernate。

我希望这个答案可以避免其他人犯同样的错误并浪费他们的时间。

【讨论】：