java 在复合键 hibernate xml 中映射复合键
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Map a composite key inside a composite key hibernate xml
提问by Organiccat
This is what I would like to do, map an object to another table that has the same primary keys. The below is an example, basically I have one object with a composite key that has a composite key for ANOTHER table, but I don't know how to include both in order to create the proper object key. I highlighted the row that is wrong, it only includes one of the properties for the key.
这就是我想要做的，将一个对象映射到另一个具有相同主键的表。下面是一个示例，基本上我有一个带有复合键的对象，该对象具有 ANOTHER 表的复合键，但我不知道如何同时包含这两个键以创建正确的对象键。我突出显示了错误的行，它只包含键的属性之一。
<class name="BusinessRuleObject" table="BUSINESS_RULE_OBJECTS" schema="DB">
<composite-id name="businessRuleObjectId" class="BusinessRuleObjectId">
<key-property name="sameIdCode" column="ID_CD" />
**<key-many-to-one name="businessRule" class="BusinessRule" column="BUSINESS_RULE" />**
</composite-id>
<!-- ... STUFF GOES HERE -->
</class>
<class name="BusinessRule" table="BUSINESS_RULE_STRINGS" schema="DB">
<composite-id name="businessRule2ID" class="BusinessRule2ID">
<key-property name="sameIdCode" column="ID_CD" />
<key-property name="businessRuleCode" column="BUSINESS_RULE" />
</composite-id>
<!-- TOTALLY DIFFERENT STUFF GOES HERE -->
</class>
回答by Joel Hudon
Only one properties of the composite foreign key businessRuleis included, because the <key-many-to-oneonly declare one column BUSINESS_RULE. It should declare the two column of the composite key it is referencing BUSINESS_RULEand ID_CDin your example. By adding the ID_CDcolumn to the <key-many-to-oneelement you need to remove or rename the column of <key-property name="sameIdCode" column="ID_CD" />element.
只businessRule包含复合外键的一个属性，因为<key-many-to-one只声明了一个 column BUSINESS_RULE。它应该声明它引用的组合键的两列，BUSINESS_RULE并且ID_CD在您的示例中。通过将ID_CD列添加到<key-many-to-one元素，您需要删除或重命名<key-property name="sameIdCode" column="ID_CD" />元素列。
The association <key-many-to-oneto businessRuleobject should be mapped like this:
该协会<key-many-to-one于businessRule对象应当映射是这样的：
<composite-id name="businessRuleObjectId" class="BusinessRuleObjectId">
<key-many-to-one name="businessRule" class="BusinessRule" >
<column name="ID_CD" />
<column name="BUSINESS_RULE" />
</key-many-to-one>
</composite-id>
Hibernate reference documenation
5.1.7. composite-id
Components as composite identifiers
Hibernate 参考文档
5.1.7。Composite-id
组件作为复合标识符
