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package org.apache.cayenne.tutorial;
import java.util.Calendar;
import java.util.Collections;
import java.util.GregorianCalendar;
import java.util.List;
import org.apache.cayenne.Cayenne;
import org.apache.cayenne.ObjectContext;
import org.apache.cayenne.configuration.server.ServerRuntime;
import org.apache.cayenne.exp.Expression;
import org.apache.cayenne.query.SelectQuery;
import org.apache.cayenne.tutorial.persistent.Artist;
import org.apache.cayenne.tutorial.persistent.Gallery;
import org.apache.cayenne.tutorial.persistent.Painting;
public class Main {
public static void main(String[] args) {
// starting Cayenne
ServerRuntime cayenneRuntime = new ServerRuntime("cayenne-project.xml");
// getting a hold of ObjectContext
ObjectContext context = cayenneRuntime.newContext();
newObjectsTutorial(context);
selectTutorial(context);
deleteTutorial(context);
}
static void newObjectsTutorial(ObjectContext context) {
// creating new Artist
Artist picasso = context.newObject(Artist.class);
picasso.setName("Pablo Picasso");
picasso.setDateOfBirthString("18811025");
// Creating other objects
Gallery metropolitan = context.newObject(Gallery.class);
metropolitan.setName("Metropolitan Museum of Art");
Painting girl = context.newObject(Painting.class);
girl.setName("Girl Reading at a Table");
Painting stein = context.newObject(Painting.class);
stein.setName("Gertrude Stein");
// connecting objects together via relationships
picasso.addToPaintings(girl);
picasso.addToPaintings(stein);
girl.setGallery(metropolitan);
stein.setGallery(metropolitan);
// saving all the changes above
context.commitChanges();
}
static void selectTutorial(ObjectContext context) {
// SelectQuery examples
SelectQuery<Painting> select1 = SelectQuery.query(Painting.class, null);
List<Painting> paintings1 = context.select(select1);
Expression qualifier2 = Painting.NAME.likeInsensitive("gi%");
SelectQuery<Painting> select2 = SelectQuery.query(Painting.class, qualifier2);
List<Painting> paintings2 = context.select(select2);
Calendar c = new GregorianCalendar();
c.set(c.get(Calendar.YEAR) - 100, 0, 1, 0, 0, 0);
Expression qualifier3 = Expression.fromString("artist.dateOfBirth < $date");
qualifier3 = qualifier3.expWithParameters(Collections.singletonMap("date", c.getTime()));
SelectQuery<Painting> select3 = SelectQuery.query(Painting.class, qualifier3);
List<Painting> paintings3 = context.select(select3);
}
static void deleteTutorial(ObjectContext context) {
// Delete object examples
Expression qualifier = Artist.NAME.eq("Pablo Picasso");
SelectQuery<Artist> selectToDelete = SelectQuery.query(Artist.class, qualifier);
Artist picasso = (Artist) Cayenne.objectForQuery(context, selectToDelete);
if (picasso != null) {
context.deleteObjects(picasso);
context.commitChanges();
}
}
}