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many-to-one配置:
<many-to-one name="dailyCatalog" column="daily_catalog_id" class="com.tyloo.po.DailyCatalog" fetch="join" lazy="false" />
one-to-many配置:
<set name="company" fetch="join" lazy="false">
<key column="company_id"></key>
<!--
这里的column="company_id" 是指明了在company_data表里有一个company_id的列名,是指向company_data表的外键
-->
<one-to-many class="com.tyloo.po.CompanyData" />
</set>
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原文地址:http://www.cnblogs.com/toSeeMyDream/p/5537861.html