querydsl/querydsl-sql/src/test/java/com/mysema/query/QBeanTest.java

package com.mysema.query;

import static org.junit.Assert.assertEquals;

import org.junit.Test;

import com.mysema.query.sql.RelationalPathBase;
import com.mysema.query.sql.Table;
import com.mysema.query.types.PathMetadata;
import com.mysema.query.types.PathMetadataFactory;
import com.mysema.query.types.QBean;
import com.mysema.query.types.path.BeanPath;
import com.mysema.query.types.path.NumberPath;
import com.mysema.query.types.path.StringPath;

public class QBeanTest {

    @Table("PERSON")
    public static class QPerson extends RelationalPathBase<QPerson> {
        private static final long serialVersionUID = 609527362;
        public static final QPerson person = new QPerson("PERSON");
        public final StringPath firstName = createString("FIRST_NAME");
        public final NumberPath<Integer> id = createNumber("ID", Integer.class);
        public final StringPath lastName = createString("LAST_NAME");

        public QPerson(String variable) {
           super(QPerson.class, PathMetadataFactory.forVariable(variable));
        }

        public QPerson(BeanPath<? extends QPerson> entity) {
            super(entity.getType(), entity.getMetadata());
        }

        public QPerson(PathMetadata<?> metadata) {
            super(QPerson.class, metadata);
        }

    }

    public static class Person {
        private int id;
        private String firstName;
        private String lastName;
        public int getId() {
            return id;
        }
        public void setId(int id) {
            this.id = id;
        }
        public String getFirstName() {
            return firstName;
        }
        public void setFirstName(String firstName) {
            this.firstName = firstName;
        }
        public String getLastName() {
            return lastName;
        }
        public void setLastName(String lastName) {
            this.lastName = lastName;
        }

    }

    @Test
    public void NewInstance(){
        QPerson p = QPerson.person;
        QBean<Person> projection = new QBean<Person>(Person.class, p.id, p.firstName.as("firstName"), p.lastName.as("lastName"));

        Person person = projection.newInstance(3, "John", "Doe");
        assertEquals(3,      person.getId());
        assertEquals("John", person.getFirstName());
        assertEquals("Doe",  person.getLastName());
    }

}