hibernate详解（十二）继承关系映射

每个类映射一张表

SQL语句：

/* 每个类映射一张表 */
CREATE TABLE t_join_billingdetails(
    id NUMBER(10) PRIMARY KEY,
    owner VARCHAR2(15),
    code VARCHAR2(15),
    created DATE
);

CREATE TABLE t_join_bankaccount(
    billing_id NUMBER(10) PRIMARY KEY,
    bankname VARCHAR2(20),
    bankswift VARCHAR2(20),
    FOREIGN KEY(billing_id) REFERENCES t_join_billingdetails(id)
);

CREATE TABLE t_join_creditcart(
    billing_id NUMBER(10) PRIMARY KEY,
    credit_cart_type VARCHAR2(20),
    expired_month VARCHAR2(20),
    expired_year VARCHAR2(20),
    FOREIGN KEY(billing_id) REFERENCES t_join_billingdetails(id)
);

映射文件：

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC
    "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
    "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">

<hibernate-mapping package="com.iotek.basic.inheritance.pojo">
    <class name="BillingDetails" table="T_JOIN_BILLINGDETAILS">
        <id name="id" column="ID" type="long">
            <generator class="sequence">
                <param name="sequence">t_billing_seq</param>
            </generator>
        </id>
        
        <property name="owner" type="string" column="OWNER"/>
        <property name="created" type="date" column="CREATED"/>
        <property name="code" type="string" column="CODE"/>
        
        <joined-subclass name="CreditCard" table="T_JOIN_CREDITCART">
            <key column="BILLING_ID" />
            <property name="type" type="string" column="CREDIT_CART_TYPE" />
            <property name="expMonth" type="string" column="EXPIRED_MONTH" />
            <property name="expYear" type="string" column="EXPIRED_YEAR" />
        </joined-subclass>
        
        <joined-subclass name="BankAccount" table="T_JOIN_BANKACCOUNT">
            <key column="BILLING_ID" />
            <property name="bankName" type="string" column="BANKNAME" />
            <property name="bankSwift" type="string" column="BANKSWIFT" />
        </joined-subclass>
    </class>
</hibernate-mapping>

类的结构与上一讲的相同，在这里就不列举出来了。