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Account entity

Example | -5 shows an extract of the Account class.

Example 12-5 Account entity

package itso.bank.entities;

import java.io.Serializable;

import java.math.BigDecimal;

import java.util.Set;

import javax.persistence.Entity;

import javax.persistence.Id;

import javax.persistence.JoinColumn;

import javax.persistence.JoinTable;

import javax.persistence.ManyToMany;

import javax.persistence.OneToMany;

@Entity

public class Account implements Serializable {

	@Id

	private String id;

	private BigDecimal balance;

	@OneToMany(mappedBy="account")

	private Set<Transaction> transactCollection;

	@ManyToMany

	@JoinTable(

		joinColumns=@JoinColumn(name="ACCOUNT_ID"),

		inverseJoinColumns=@JoinColumn(name="CUSTOMER_SSN"))

	private Set<Customer> customerCollection;

	......

	// contructor, getter, setter methods

The @Entity annotation defined the class as an entity.

The @Id annotation defines id as the primary key.

The @OneToMany annotation defines the 1:m relationship with Transaction. The mapping is defined in the Transaction entity. A Set<Tranasaction> field holds the related instances.

The @ManyToMany and @JoinTables annotations define the m:m relationship with Customer, including the two join columns. A Set<Customer> field holds the related instances. We have to add the name of the relationship table (ITSO.ACCOUNT_CUSTOMER).

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