examples: align the example to the blog post (#26)

examples/e2e_java_example/migrations/20231211121102.sql

@@ -0,0 +1,20 @@
+-- Create "movies" table
+CREATE TABLE "movies" (
+  "id" bigserial NOT NULL,
+  "numberinseries" integer NULL,
+  "title" character varying(255) NULL,
+  PRIMARY KEY ("id")
+);
+-- Create "actors" table
+CREATE TABLE "actors" (
+  "name" character varying(255) NOT NULL,
+  PRIMARY KEY ("name")
+);
+-- Create "movieparticipation" table
+CREATE TABLE "movieparticipation" (
+  "actorname" character varying(255) NOT NULL,
+  "movieid" bigint NOT NULL,
+  PRIMARY KEY ("actorname", "movieid"),
+  CONSTRAINT "fkaq2kkwvh9870847sm35vtjtiy" FOREIGN KEY ("movieid") REFERENCES "movies" ("id") ON UPDATE NO ACTION ON DELETE NO ACTION,
+  CONSTRAINT "fktm8fbwa577lnbvwdjegwxvget" FOREIGN KEY ("actorname") REFERENCES "actors" ("name") ON UPDATE NO ACTION ON DELETE NO ACTION
+);

examples/e2e_java_example/migrations/atlas.sum

@@ -0,0 +1,2 @@
+h1:GGcfPGf8nfFlFivTvL1pZaln1ryq4XEx3z7VMT+4VP4=
+20231211121102.sql h1:X6GruO9lR7xlAfG/+PiHN7lpni3+j2DMIDEAWRSf5e0=

examples/e2e_java_example/src/main/java/org/example/Actor.java

@@ -8,6 +8,9 @@
 @Entity
 @Table(name = "Actors")
 public class Actor {
+    Actor() {
+
+    }
     Actor(String name) {
         this.name = name;
     }

examples/e2e_java_example/src/main/java/org/example/Main.java

@@ -3,6 +3,7 @@
 import org.hibernate.SessionFactory;
 import org.hibernate.boot.MetadataSources;
 
+import java.util.List;
 import java.util.Set;
 
 public class Main {
@@ -15,11 +16,15 @@ public static void main(String[] args) {
                 .buildSessionFactory();
 
         sessionFactory.inTransaction(session -> {
-            Movie matrix = new Movie();
-            matrix.title = "The Matrix";
-            Actor keanuReeves = new Actor("Keanu Reeves");
-            keanuReeves.actedIn = Set.of(new MovieParticipation(matrix, keanuReeves));
-            session.persist(keanuReeves);
+            List<Actor> actors = session.createQuery("from Actor").list();
+            if (!actors.isEmpty()) {
+                actors.forEach(x -> System.out.println("Found Actor " + x.name));
+            } else {
+                Movie matrix = new Movie("The Matrix", 1);
+                Actor keanuReeves = new Actor("Keanu Reeves");
+                keanuReeves.actedIn = Set.of(new MovieParticipation(matrix, keanuReeves));
+                session.persist(keanuReeves);
+            }
         });
     }
 }

examples/e2e_java_example/src/main/java/org/example/Movie.java

@@ -7,9 +7,16 @@
 @Entity
 @Table(name = "Movies")
 public class Movie {
+
+    Movie(String title, Integer numberInSeries) {
+        this.title = title;
+        this.numberInSeries = numberInSeries;
+    }
     @Id
     @GeneratedValue(strategy = GenerationType.IDENTITY)
     public Long id;
 
     public String title;
+
+    public Integer numberInSeries;
 }

examples/e2e_java_example/src/main/resources/hibernate.properties

@@ -6,4 +6,3 @@ hibernate.show_sql=true
 hibernate.format_sql=true
 hibernate.highlight_sql=true
 
-hibernate.hbm2ddl.auto=create