我想通过Hibernate中的外键在Definition(DEF)和Details(DET)表之间创建关系。在这种情况下,一个定义具有多个细节。
当我将它们连接到 hbm.xml 内部时,出现诸如以下错误:
由于:org.hibernate.MappingException:映射中的重复列 对于实体:com.ykb.hmn.cms.commission.datamodel.ICmsExemptRestrictDet 列:ID(应与insert =“ false” update =“ false”映射)
pd.DataFrame(data={'col1': [1, 2], 'A': ['A', 'A']})
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="com.ykb.hmn.cms.commission.datamodel.ICmsExemptRestrictDef"
table="CMS_EXEMPT_RESTRICT_DEF">
<tuplizer class="com.ykb.hmn.inf.core.datamodel.IntfEntityTuplizer"
entity-mode="pojo" />
<id name="oid" type="java.lang.Long">
<column name="ID" />
<generator class="sequence">
<param name="sequence">SEQ_CMS_EXEMPT_RESTRICT_DEF</param>
</generator>
</id>
.
.
.
<bag name="cmsExemptRestrictDetails" table="CMS_EXEMPT_RESTRICT_DET"
inverse="true" lazy="true" fetch="select">
<key>
<column name="DEFINITION_ID" not-null="true" />
</key>
<one-to-many
class="com.ykb.hmn.cms.commission.datamodel.ICmsExemptRestrictDet" />
</bag>
</class>
</hibernate-mapping>
首先-我需要在每个hbm xml中定义多对一和一对多关系吗?
第二个-我是否需要将“详细信息”的列ID重命名为DETAIL_ID?
谢谢。
答案 0 :(得分:1)
属性映射Definition_id不正确。外键不应该被映射。删除它,然后将多音映射中的列名更改为definition_id:
将hbm xml详细信息更改为:
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="com.ykb.hmn.cms.commission.datamodel.ICmsExemptRestrictDet"
table="CMS_EXEMPT_RESTRICT_DET">
<tuplizer class="com.ykb.hmn.inf.core.datamodel.IntfEntityTuplizer"
entity-mode="pojo" />
<id name="oid" type="java.lang.Long">
<column name="ID" />
<generator class="sequence">
<param name="sequence">SEQ_CMS_EXEMPT_RESTRICT_DET</param>
</generator>
</id>
<many-to-one name="cmsExemptRestrictDefinition" class="com.ykb.hmn.cms.commission.datamodel.ICmsExemptRestrictDef" fetch="select">
<column name="DEFINITION_ID" not-null="true" />
</many-to-one>
</class>
</hibernate-mapping>