这篇博客详细介绍了如何在Hibernate中通过XML配置文件实现多对多的映射关系，包括实体类`TProject`与`TEmp`之间的关联设置，以及在`tempandproject`表中的关系维护。
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="entity.TProject" table="tproject">
<id name="pNo" column="pno" type="java.lang.Integer">
<generator class="assigned"/>
</id>
<property name="pName" type="java.lang.String" column="pname"/>
<set name="temps" table="tempandproject" cascade="all">
<key column="pno"/>
<many-to-many class="entity.TEmp" column="eno"/>
</set>
</class>
</hibernate-mapping>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="entity.TProject" table="tproject">
<id name="pNo" column="pno" type="java.lang.Integer">
<generator class="assigned"/>
</id>
<property name="pName" type="java.lang.String" column="pname"/>
<set name="temps" table="tempandproject" cascade="all">
<key column="pno"/>
<many-to-many class="entity.TEmp" column="eno"/>
</set>
</class>
</hibernate-mapping>
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