有什么办法可以使两个表之间没有直接关系但又在hibernate中有两个公共字段呢？

我有两个表，称为boiler_plates和profile，它们之间没有直接关系，但是有一个名为contract_id的公共字段。

我写了查询“来自bp.bt_contracts = p.contract_id上的Boiler_Plates
bp内部连接配置文件p”，但它不断抛出错误。“意外令牌：在第1行附近，第75列[来自com.catapult.bid.model.Boiler_Plates作为bp内部连接配置文件，在bp.bt_contracts
= p.contract_id上为p，其中bp.bt_contracts = 1]。

以下是boiler_plates和配置文件的hibernate映射文件。

锅炉板的映射文件。

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping SYSTEM "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">


<hibernate-mapping package="com.catapult.bid.model"  default-access="field" >
    <class name="Boiler_Plates" table="bt_boiler_plates" schema="bidtool">

        <id name="boiler_plate_id" type="int" column="boiler_plate_id">           
            <generator class="sequence">
                 <param name="sequence">bidtool.boiler_plates_boiler_plate_id_seq</param>
            </generator>
        </id>

        <property name="boilerPlateName" type="string">
            <column name="boiler_plate_name" length="20" not-null="true" />
        </property>
        <property name="editable" type="int">
            <column name="editable"/>
        </property>
        <property name="boilerPlateContent" type="string">
            <column name="boiler_plate_content" length="20" />
        </property>
        <property name="insertTime" type="date" insert="false">
            <column name="insert_time_stamp"/>
        </property>
         <many-to-one class="Contracts" fetch="select" name="bt_contracts">
             <column name="contract_id"/>
        </many-to-one>
    </class> 
</hibernate-mapping>

概要文件的映射文件

  <?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping default-access="field" package="com.catapult.bid.model">
  <class name="Profiles" schema="bidtool" table="bid_tool_profiles">
    <id column="profile_id" name="profileId" type="string">
      <generator class="com.catapult.bid.commons.ProfileIDGenerator"/>
    </id>
    <many-to-one class="User" fetch="select" name="appUsers">
      <column name="user_id"/>
    </many-to-one>
    <property name="profileContent" type="string">
      <column name="profile_content"/>
    </property>
    <property name="scac" type="string">
      <column length="20" name="scac"/>
    </property>
    <property name="created" type="timestamp" update="false">
      <column name="insert_timestamp"/>
    </property>
    <property name="status" type="string">
      <column length="9" name="status" not-null="true"/>
    </property>
    <property name="editable" type="string">
      <column length="1" name="editable" not-null="true"/>
    </property>
  </class>
</hibernate-mapping>