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Код

<?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>
    <!-- Клиенты -->
    <class name="Clients" table="clients">
        <id column="id" name="id" type="long">
            <generator class="native"/>
        </id>
    <!-- Основые поля -->
    <property column="name" type="string" name="name" not-null="true"/>
    <property column="inn" type="string" name="inn" not-null="true" />
    <property column="type_internal" type="boolean" name="type_internal" not-null="true" />
    <property column="type_legal" type="boolean" name="type_legal" not-null="true" />   
    </class>
    
    <!-- Юридические лица -->
    <class name="Legal_person" table="legal_person">
        <id column="id" name="id" type="long"></id>
        <one-to-one name="clients" class="Clients" constrained="true"/>    
        <!-- Доп поля -->
        <property column="kpp" name="kpp" type="string" not-null="true"/>
        <property column="snp_bookkeeper" type="string" name="snp_bookkeeper" />
        <property column="snp_director" type="string" name="snp_director" />
    </class>

    <!-- Физические лица -->
    <class name="Physical_person" table="physical_person">
        <id column="id" name="id" type="long"></id>
        <one-to-one name="clients" class="Clients" constrained="true"/>    
        <!-- Доп поля -->
        <property column="snp" name="snp" type="string" not-null="true"/>
        <property column="passport_data" type="string" name="passport_data" />
    </class>

</hibernate-mapping>