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POMapping a relationship between 3 entities in Hibernate
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  1. POMapping a relationship between 3 entities in Hibernate
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    copied!<p>I am trying to get to grips with hibernate and have a problem trying to map a relationship between 3 entities:</p> <p>For example I have the following classes:</p> <p>Distributor (id, name) e.g.: TNT, UPS, Fed Ex and each distributor has a selection of ShippingMethod (id, name, description) e.g.: Super saver, overnight international, Next Day and each shipping method has a series of ShippingOption (id, name, default, active, cost, availability) and each of these are specific to a particular distributor.</p> <p>To do that in a DB I would have a table for Distributor, a table for ShippingMethods and a table for ShippingOptions which would have a FK relationship to Distributor and ShippingMethods. </p> <p>However, in my domain model I would like to have two classes - Distributor() which would contain a list of ShippingOption() classes. ShippingOption() is a class combined from both ShippingMethod() and ShippingOption() (I've left out getters etc for brevity below): </p> <pre><code>@Entity @Table(name = "shipping_option") public class ShippingOption { @Column(name = "is_active", nullable = false) private boolean isActive = false; @Column(name = "is_default", nullable = false) private boolean isDefault = false; @Column(name = "cost", nullable = false) private BigDecimal cost = BigDecimal.ZERO; private ShippingMethod shippingMethod = new ShippingMethod(); public ShippingOption() { } public ShippingOption(boolean isDefault, BigDecimal cost, ShippingMethod shippingMethod) { setDefault(isDefault); cost(cost); setShippingMethod(shippingMethod); } public void setDefault(boolean isDefault) { this.isDefault = isDefault; } public void setShippingMethod(ShippingMethod shippingMethod) { this.shippingMethod = shippingMethod; } } </code></pre> <p>Is it possible to model this in Hibernate and how? If you need more information please let me know. Not sure if this is relevent but I am using spring mvc 3 also.</p> <p>Cheers</p> <p>Morris</p>
 

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