当映射到子类时，ColdFusion ORM关系映射'一对多'问题​​

Question

这是可重复的，可能是一个错误。在这个例子中我有三个表：

付款
paymentID
日期
paymentType

信用
paymentID
cardNo
cardTypeID

CardTyp È
ID
说明

付款和信用分别父和子类表。代码如下：

payment.cfc

component persistent="true" table="payment" discriminatorcolumn="paymentType"{ 
    property name="paymentID"; 
    property name="date"; 
} 

credit.cfc

component persistent="true" extends="payment" joincolumn="paymentID" 
    table="credit" discriminatorvalue="ccard"{ 
    property name="cardNo"; 
    property name="cardTypes" fieldtype="many-to-one" lazy="true" cfc="cardType" 
     fkcolumn="cardTypeID"; 
} 

cardType.cfc

component persistent="true" table="cardType"{ 
    property name="id"; 
    property name="description"; 
    property name="creditCards" fieldtype="one-to-many" lazy="extra" 
     type="struct" structkeycolumn="id" cfc="credit" fkcolumn="cardType"; 
} 

错误与cardType.cfc中的“一对多”关系有关。当ORM生成SQL，它试图将fkcolumn适用于选择和WHERE子句父类：

select 
    creditcard0_.cardType as cardType30569_1_, 
    creditcard0_.PaymentID as PaymentID1_, 
    creditcard0_.PaymentID as PaymentID30570_0_, 
    creditcard0_.Date as Date30570_0_, 
    creditcard0_1_.cardNo as cardNo30572_0_, 
    creditcard0_1_.cardType as cardType30572_0_ 
from 
    Payment creditcard0_ 
inner join 
    CreditCardPayment creditcard0_1_ 
     on creditcard0_.PaymentID=creditcard0_1_.PaymentID 
where 
    creditcard0_.cardType=? 

这导致了大量的“CardType不存在”的错误时，一个简单的entityload（“cardType” ） 叫做。

任何人都有任何想法，为什么它不会正确地应用于子类，它可能是我缺少的配置设置。

在此先感谢。

Answer 1

所以，如果我的hbmxml文件映射像这样，显然它修复该问题：

<map lazy="extra" name="creditCards" table="CreditCardPayment" inverse="true"> 
    <key column="cardType"/> 
    <map-key column="CardNo" type="string"/> 
    <many-to-many unique="true" column="PaymentID" class="cfc:entities.credit"/> 
</map> 

Answer 2

尝试向付款CFC添加mapedSuperClass =“true”。不知道这是否会像我一直使用mappedSuperClass作为非持久“基础”对象一样工作。