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  package org.apache.cayenne.query;
  
  import static org.junit.Assert.assertEquals;
  
  import java.util.Collections;
  
  import org.apache.cayenne.ObjectContext;
  import org.apache.cayenne.di.Inject;
  import org.apache.cayenne.test.jdbc.DBHelper;
  import org.apache.cayenne.test.jdbc.TableHelper;
  import org.apache.cayenne.unit.di.runtime.CayenneProjects;
  import org.apache.cayenne.unit.di.runtime.RuntimeCase;
  import org.apache.cayenne.unit.di.runtime.UseCayenneRuntime;
  import org.junit.Before;
  import org.junit.Test;
  
  @UseCayenneRuntime(CayenneProjects.TESTMAP_PROJECT)
  public class EJBQLQueryCountIT extends RuntimeCase {
  
  	@Inject
  	private ObjectContext context;
  
  	@Inject
  	protected DBHelper dbHelper;
  
  	protected TableHelper tArtist;
  	protected TableHelper tPainting;
  	protected TableHelper tGallery;
  
  	@Before
  	public void before() throws Exception {
  		tArtist = new TableHelper(dbHelper, "ARTIST");
  		tArtist.setColumns("ARTIST_ID", "ARTIST_NAME");
  
  		tPainting = new TableHelper(dbHelper, "PAINTING");
  		tPainting.setColumns("PAINTING_ID", "ARTIST_ID", "PAINTING_TITLE");
  	}
  
  	@Test
  	public void test_SimpleCount() throws Exception {
  		tArtist.insert(1, "A1");
  		tArtist.insert(2, "A2");
  		tArtist.insert(3, "A3");
  
  		EJBQLQuery query = new EJBQLQuery("SELECT COUNT(a) FROM Artist a");
  
  		// this should be simply a count of painting/artist joins
  		assertEquals(Collections.singletonList(3L), context.performQuery(query));
  	}
  
  	@Test
  	public void test_ToOne() throws Exception {
  		tArtist.insert(1, "A1");
  		tArtist.insert(2, "A2");
  		tArtist.insert(3, "A3");
  
  		tPainting.insert(1, 1, "P1");
  		tPainting.insert(2, 1, "P2");
  		tPainting.insert(4, 2, "P1");
  
  		EJBQLQuery query = new EJBQLQuery("SELECT COUNT(p.toArtist) FROM Painting p");
  
  		// this should be simply a count of painting/artist joins
  		assertEquals(Collections.singletonList(3L), context.performQuery(query));
  	}
  
  	@Test
  	public void test_DistinctToOne() throws Exception {
  		tArtist.insert(1, "A1");
  		tArtist.insert(2, "A2");
  		tArtist.insert(3, "A3");
  
  		tPainting.insert(1, 1, "P1");
  		tPainting.insert(2, 1, "P2");
  		tPainting.insert(4, 2, "P1");
  
  		EJBQLQuery query = new EJBQLQuery("SELECT COUNT(DISTINCT p.toArtist) FROM Painting p");
  		// this should be a count of artists that have paintings
  		assertEquals(Collections.singletonList(2L), context.performQuery(query));
  	}
  	
  	@Test
  	public void test_DistinctToOneAttribute() throws Exception {
  		tArtist.insert(1, "A1");
  		tArtist.insert(2, "A1");
  		tArtist.insert(3, "A1");
  
  		tPainting.insert(1, 1, "P1");
  		tPainting.insert(2, 1, "P2");
  		tPainting.insert(4, 2, "P1");
  
  		EJBQLQuery query = new EJBQLQuery("SELECT COUNT(DISTINCT p.toArtist.artistName) FROM Painting p");
  		// this should be a count of artists that have paintings
  		assertEquals(Collections.singletonList(1L), context.performQuery(query));
  	}
  	
  }
  