Examples of org.javaee7.jpa.ordercolumn.OrderColumnBiJoinTest

org.javaee7.movieplex7.entities.Sales

This tests and demonstrates the {@link OrderColumn} annotation when used together with abi-directional parent-child mapping, where the child holds a foreign key to the parent.

This is a variation on the normal oneToMany mapping using two {@link JoinColumn} annotations instead of using the mappedBy attribute.

In this mapping the position each child has in the parent's list is stored in the child table and fully managed by JPA. This means that this position index does not explicitly show up in the object model.

Example SQL DDL (h2 syntax)

 create table Parent ( id bigint generated by default as identity, primary key (id) ); create table Child ( id bigint generated by default as identity, parent_id bigint, children_ORDER integer, primary key (id), foreign key (parent_id) references Parent );

@author Arjan Tijms

@Named
public class SalesProcessor implements ItemProcessor {


    @Override
    public Sales processItem(Object s) {
        Sales sales = new Sales();
        
        StringTokenizer tokens = new StringTokenizer((String)s, ",");
        sales.setId(Integer.parseInt(tokens.nextToken()));
        sales.setAmount(Float.parseFloat(tokens.nextToken()));
        
        return sales;
    }

Examples of org.javaee7.jpa.ordercolumn.OrderColumnBiJoinTest

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