android java qr code generator The complete Hibernate mapping catalog in Java

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APPENDIX
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The complete Hibernate mapping catalog
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Although this mapping is a niche case, it has some neat uses, especially for databases that need to add new tables dynamically at runtime (as a content management system might do) or legacy databases. Hibernate 3 has a new way to handle the table-per-concrete-class strategy, <union-subclass>, but for 2.x, the <any> mapping is what s available. So let s explore what this looks like. Our example for this section deals with event registration and payments. The Registration class will have any relationship to classes, which implement a PaymentDetails interface. Since the Event is going to be open, you need liberal payment options. So you ll accept both CreditCardPayments and BarterPayments. Both of these are structurally different; each gets its own table. Here s what the PaymentDetails interface looks like:
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public interface PaymentDetails { public Long getId(); }
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The first subclass looks like this:
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/** * @hibernate.class table="credit_card_payments" */ public class CreditCardPayment implements Serializable, PaymentDetails { private Long id; private BigDecimal amount; private String currencyCode; /** * @hibernate.id generator-class="native" column="id" */ public Long getId() { return id; } public void setId(Long id) { this.id = id; } /** * @hibernate.property */ public BigDecimal getAmount() { return amount; } public void setAmount(BigDecimal amount) { this.amount = amount; } /**
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Subclasses
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* @hibernate.property column="currency_code" */ public String getCurrencyCode() { return currencyCode; } public void setCurrencyCode(String currencyCode) { this.currencyCode = currencyCode; } }
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And here s the second subclass:
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/** * @hibernate.class table="barter_payments" */ public class BarterPayment implements Serializable, PaymentDetails { private Long id; private int numberOfCows; private int numberOfSheep; /** * @hibernate.id generator-class="native" column="id" */ public Long getId() { return id; } public void setId(Long id) { this.id = id; } /** * @hibernate.property column="number_of_cows" */ public int getNumberOfCows() { return numberOfCows; } public void setNumberOfCows(int numberOfCows) { this.numberOfCows = numberOfCows; } /** * @hibernate.property column="number_of_sheep" */ public int getNumberOfSheep() { return numberOfSheep; } public void setNumberOfSheep(int numberOfSheep) { this.numberOfSheep = numberOfSheep; } }
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APPENDIX
The complete Hibernate mapping catalog
As you can see, both subclasses implement a very simple interface, PaymentDetails, and each has its own id and table. Nothing in the tables they use indicates they are subclasses. Next, let s look at the Registration class, which actually has the <any> mapping:
/** * @hibernate.class table="registrations" */ public class Registration implements Serializable { private Long id; private PaymentDetails paymentDetails; /** * @hibernate.id generator-class="native" column="id" */ public Long getId() { return id; } public void setId(Long id) { this.id = id; } /** * @hibernate.any id-type="long" meta-type="java.lang.Class" * @hibernate.any-column name="table_name" * @hibernate.any-column name="payment_id" */ public PaymentDetails getPaymentDetails() { return paymentDetails; } public void setPaymentDetails(PaymentDetails paymentDetails) { this.paymentDetails = paymentDetails; } }
The @hibernate.any and @hibernate.any-column tags specify the column with the foreign key, and the column that holds the table name. Here we use the fully qualified class name as the table name. The three mapping files follow. First, here s Registration.hbm.xml:
<class name="com.manning.hq.apdxA.Registration" table="registrations"> <id name="id" column="id" type="java.lang.Long">
Subclasses
<generator class="native"/> </id> <any name="paymentDetails" id-type="long" meta-type="java.lang.Class"> <column name="payment_id" /> <column name="table_name" /> </any> </class>
Next is CreditCardPayment.hbm.xml:
<class name="com.manning.hq.apdxA.CreditCardPayment" table="credit_card_payments"> <id name="id" column="id" type="java.lang.Long" > <generator class="native" /> </id> <property name="amount" type="java.math.BigDecimal" column="amount" /> <property name="currencyCode" type="java.lang.String" column="currency_code" /> </class>
And finally, BarterPayment.hbm.xml:
<class name="com.manning.hq.apdxA.BarterPayment" table="barter_payments"> <id name="id" column="id" type="java.lang.Long" > <generator class="native" /> </id> <property name="numberOfCows" type="int" column="number_of_cows" /> <property name="numberOfSheep" type="int" column="number_of_sheep" /> </class>
A Registration object can be assigned either a CreditCardPayment or a BarterPayment, and each object is stored in its own table.
APPENDIX
The complete Hibernate mapping catalog
Table schema
Here s what the table structures would look like:
Registrations id payment_id table_name id credit_card_payment amount currency_code
barter_payment id number_of_cows number_of_sheep
To further highlight the data that is actually added to the database, suppose you wrote the following code:
Registration r = new Registration(); CreditCardPayment cc = new CreditCardPayment(); r.setPaymentDetails(cc); cc.setAmount(new BigDecimal(34.50)); cc.setCurrencyCode("US"); session.save(cc); session.save(r); session.flush();
You d get something like the following rows in the database:
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