![]() It declares that a new table EMPLOYEE_ACCOUNT will be created with two columns EMPLOYEE_ID (primary key of EMPLOYEE table) and ACCOUNT_ID (primary key of ACCOUNT table). Other fields, getters, setters are hidden for annotation is used in EmployeeEntity class. In this technique, the main annotation to be used is This annotation is used to define the new table name (mandatory) and foreign keys from both of the tables. Let us start with the targeted DB structure in this technique. Here, hibernate will create a new table that will store the primary key values from both entities. We can verify the data and mappings in both tables when we run the above program. ![]() Hibernate: insert into Employee (ACCOUNT_ID, EMAIL, FIRST_NAME, LAST_NAME) values (?, ?, ?, ?) Hibernate: insert into ACCOUNT (ACC_NUMBER) values (?) Running the above code creates the desired schema in the database and runs these SQL queries. Let’s test the above mappings: AccountEntity account = new AccountEntity() ĮmployeeEntity emp = new EmployeeEntity() Īssertions.assertNotNull(account.getAccountId()) Īssertions.assertNotNull(emp.getEmployeeId()) Īssertions.assertNotNull(emp.getAccount().getAccountId()) Public class AccountEntity implements Serializable = "ID")Ībove "mappedBy” attribute declares that it is dependent on the owner entity for mapping. The ‘ mappedBy‘ refers to the property name of the association on the owner’s side. To declare any side as not responsible for the relationship, the attribute mappedBy is used. The owner is responsible for the association column(s) update. In a bidirectional relationship, one of the sides (and only one) has to be the owner. A join column(s) will be created in the owner table and its name will be the concatenation of the name of the relationship in the owner side, _ (underscore), and the name of the primary key column(s) in the owned side. If no is declared on the owner side, the defaults apply. ![]() This parameter declares the column name in the targeted entity that will be used to join. It has one more parameter named referencedColumnName. The join column is declared with the annotation that looks like the annotation. Other fields, getters, setters are hidden for brevity Public class EmployeeEntity implements Serializable = "ID") To make such an association, refer the Account entity in EmployeeEntity class as follow: = "EMPLOYEE")
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