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POHibernate OneToMany Mapping - Where Set of Entities is getting saved?
 

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    <p>I have two entity class named <code>Customer</code> and <code>Activity</code>. </p> <p><code>Customer</code> has <code>customerId</code>,<code>customerName</code>,<code>activities</code> here <code>activities</code> holds set of <code>Activity</code> corresponds to each <code>Customer</code> mapped by <code>@OneToMany(mappedBy = "customer")</code> relationship.</p> <p>The <code>Customer</code> class has been defined as follows (I have removed other fields and some getter and setter for clarity):</p> <pre><code>@javax.persistence.Entity @Table(name = "CUSTOMER") public class Customer extends Entity { private String customerId; private String customerName; private Set&lt;Activity&gt; activities; @NaturalId @Column(name = "CUSTOMER_ID", nullable = false) public String getCustomerId() { return customerId; } @Column(name = "CUSTOMER_NAME", nullable = false) public String getCustomerName() { return customerName; } @OneToMany(mappedBy = "customer", fetch = FetchType.LAZY) @Cascade(CascadeType.SAVE_UPDATE) public Set&lt;Activity&gt; getActivities() { return activities; } } </code></pre> <p><code>Activity</code> has <code>activityId</code>,<code>activityName</code>,<code>customer</code> which is mapped by <code>customerId</code> with <code>@ManyToOne</code> relation. </p> <p><code>Activity</code> class is defined like:</p> <pre><code>@javax.persistence.Entity @Table(name = "ACTIVITY") public class Activity extends Entity { private String activityId; private String activityName; private Customer customer; @NaturalId @Column(name = "ACTIVITY_ID", nullable = false) public String getActivityId() { return activityId; } @Column(name = "ACTIVITY_NAME", nullable = false) public String getActivityName() { return activityName; } @ManyToOne @JoinColumn(name = "CUSTOMER_ID", nullable = false) public Customer getCustomer() { return customer; } } </code></pre> <p>Before saving a new <code>Activity</code>, I am adding this <code>Activity</code> to the <code>activities</code> set of <code>Customer</code>.</p> <p>I want to know: </p> <ul> <li>Where the <code>activities</code> of <code>Customer</code> are getting saved ?</li> <li>How the update and delete operation of both of the entities will effect each other?</li> <li>Is it the right way to create <code>@OneToMany</code> and <code>@ManyToOne</code> relationship?</li> <li>Can I add column name on <code>activities</code>?</li> </ul> <p>I am beginner in hibernate, any pointer would be very helpful to me. </p> <p>Thanks in advance.</p>
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    1. COhttp://www.mkyong.com/hibernate/hibernate-fetching-strategies-examples/
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    2. COhttp://www.mkyong.com/hibernate/hibernate-cascade-example-save-update-delete-and-delete-orphan/
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    3. COthis examples must help to understand some features that you want to know
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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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