hibernate雙向關聯注意

資料庫中2兩張表

一張user表，一張pay表

department的外鍵在user表中做主鍵

則：用eclipse的自動翻轉工具產生的設定檔如下

<?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">
<!--
    Mapping file autogenerated by MyEclipse Persistence Tools
-->
<hibernate-mapping>
    <class name="com.ddz.model.User" table="user" catalog="flandlordb">
        <id name="username" type="java.lang.String">
            <column name="username" length="20" />
            <generator class="assigned" />
        </id>
        <property name="password" type="java.lang.String">
            <column name="password" length="20" not-null="true" />
        </property>
        <property name="name" type="java.lang.String">
            <column name="name" length="50" />
        </property>
        <property name="iconPath" type="java.lang.String">
            <column name="icon_path" length="100" />
        </property>
        <property name="sex" type="java.lang.String">
            <column name="sex" length="10" />
        </property>
        <property name="qq" type="java.lang.String">
            <column name="qq" length="16" />
        </property>
        <property name="level" type="java.lang.String">
            <column name="level" length="20" />
        </property>
        <property name="EMail" type="java.lang.String">
            <column name="e_mail" length="50" />
        </property>
        <property name="idealMoney" type="java.lang.Integer">
            <column name="ideal_money" />
        </property>
        <property name="regtime" type="java.util.Date">
            <column name="regtime" length="10" />
        </property>
        <property name="wincount" type="java.lang.Integer">
            <column name="wincount" />
        </property>
        <property name="failcount" type="java.lang.Integer">
            <column name="failcount" />
        </property>
        <property name="lastlogin" type="java.sql.Timestamp">
            <column name="lastlogin" length="19" />
        </property>
        <set name="competitions" inverse="true" lazy="false">
            <key>
                <column name="user_id" length="20" />
            </key>
            <one-to-many class="com.ddz.model.Competition" />
        </set>
        <set name="paies" inverse="true" lazy="false">
            <key>
                <column name="user_id" length="20" />
            </key>
            <one-to-many class="com.ddz.model.Pay" />
        </set>
    </class>
</hibernate-mapping>

//---------------------------pay如下--------------------------------------

<?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">
<!--
    Mapping file autogenerated by MyEclipse Persistence Tools
-->
<hibernate-mapping>
    <class name="com.ddz.model.Pay" table="pay" catalog="flandlordb">
        <id name="id" type="java.lang.Integer">
            <column name="id" />
            <generator class="assigned" />
        </id>
        <many-to-one name="user" class="com.ddz.model.User" fetch="select" lazy="false">
            <column name="user_id" length="20" />
        </many-to-one>
        <property name="money" type="java.lang.Integer">
            <column name="money">
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            </column>
        </property>
        <property name="date" type="java.sql.Timestamp">
            <column name="date" length="19" />
        </property>
    </class>
</hibernate-mapping>