From c5ba081f7c1ca22380f69303722802d8e140488a Mon Sep 17 00:00:00 2001 From: Yavuz Tas <12643010+yavuztas@users.noreply.github.com> Date: Thu, 26 Mar 2020 04:23:14 +0100 Subject: [PATCH] sample codes for article BAEL-3581 (#8942) --- persistence-modules/hibernate-jpa/pom.xml | 8 +- .../entitymanager/getreference/Game.java | 38 ++++ .../entitymanager/getreference/Player.java | 50 +++++ .../src/main/resources/META-INF/create-db.sql | 3 + .../src/main/resources/META-INF/data.sql | 5 + .../src/main/resources/META-INF/drop-db.sql | 2 + .../main/resources/META-INF/persistence.xml | 86 +++++++- .../GetReferenceH2IntegrationTest.java | 194 ++++++++++++++++++ .../GetReferenceMySQLManualTest.java | 185 +++++++++++++++++ .../GetReferencePostgreSQLManualTest.java | 185 +++++++++++++++++ 10 files changed, 754 insertions(+), 2 deletions(-) create mode 100644 persistence-modules/hibernate-jpa/src/main/java/com/baeldung/hibernate/entitymanager/getreference/Game.java create mode 100644 persistence-modules/hibernate-jpa/src/main/java/com/baeldung/hibernate/entitymanager/getreference/Player.java create mode 100644 persistence-modules/hibernate-jpa/src/main/resources/META-INF/create-db.sql create mode 100644 persistence-modules/hibernate-jpa/src/main/resources/META-INF/data.sql create mode 100644 persistence-modules/hibernate-jpa/src/main/resources/META-INF/drop-db.sql create mode 100644 persistence-modules/hibernate-jpa/src/test/java/com/baeldung/hibernate/entitymanager/getreference/GetReferenceH2IntegrationTest.java create mode 100644 persistence-modules/hibernate-jpa/src/test/java/com/baeldung/hibernate/entitymanager/getreference/GetReferenceMySQLManualTest.java create mode 100644 persistence-modules/hibernate-jpa/src/test/java/com/baeldung/hibernate/entitymanager/getreference/GetReferencePostgreSQLManualTest.java diff --git a/persistence-modules/hibernate-jpa/pom.xml b/persistence-modules/hibernate-jpa/pom.xml index 67f40d5017..07b1ee1c51 100644 --- a/persistence-modules/hibernate-jpa/pom.xml +++ b/persistence-modules/hibernate-jpa/pom.xml @@ -81,11 +81,17 @@ jmh-generator-annprocess ${openjdk-jmh.version} + + org.postgresql + postgresql + ${postgresql.version} + 5.3.7.Final - 6.0.6 + 8.0.13 + 42.2.11 2.2.3 3.8.0 1.21 diff --git a/persistence-modules/hibernate-jpa/src/main/java/com/baeldung/hibernate/entitymanager/getreference/Game.java b/persistence-modules/hibernate-jpa/src/main/java/com/baeldung/hibernate/entitymanager/getreference/Game.java new file mode 100644 index 0000000000..1de8de0327 --- /dev/null +++ b/persistence-modules/hibernate-jpa/src/main/java/com/baeldung/hibernate/entitymanager/getreference/Game.java @@ -0,0 +1,38 @@ +package com.baeldung.hibernate.entitymanager.getreference; + +import javax.persistence.Entity; +import javax.persistence.Id; + +@Entity +public class Game { + + @Id + private Long id; + + private String name; + + public Game() { + } + + public Game(Long id, String name) { + this.id = id; + this.name = name; + } + + public Long getId() { + return id; + } + + public void setId(Long id) { + this.id = id; + } + + public String getName() { + return name; + } + + public void setName(String name) { + this.name = name; + } + +} diff --git a/persistence-modules/hibernate-jpa/src/main/java/com/baeldung/hibernate/entitymanager/getreference/Player.java b/persistence-modules/hibernate-jpa/src/main/java/com/baeldung/hibernate/entitymanager/getreference/Player.java new file mode 100644 index 0000000000..459a3a00ad --- /dev/null +++ b/persistence-modules/hibernate-jpa/src/main/java/com/baeldung/hibernate/entitymanager/getreference/Player.java @@ -0,0 +1,50 @@ +package com.baeldung.hibernate.entitymanager.getreference; + +import javax.persistence.Entity; +import javax.persistence.Id; +import javax.persistence.ManyToOne; + +@Entity +public class Player { + + @Id + private Long id; + + private String name; + + @ManyToOne + private Game game; + + public Player() { + } + + public Player(Long id, String name) { + this.id = id; + this.name = name; + } + + public Long getId() { + return id; + } + + public void setId(Long id) { + this.id = id; + } + + public String getName() { + return name; + } + + public void setName(String name) { + this.name = name; + } + + public Game getGame() { + return game; + } + + public void setGame(Game game) { + this.game = game; + } + +} diff --git a/persistence-modules/hibernate-jpa/src/main/resources/META-INF/create-db.sql b/persistence-modules/hibernate-jpa/src/main/resources/META-INF/create-db.sql new file mode 100644 index 0000000000..7074b603f6 --- /dev/null +++ b/persistence-modules/hibernate-jpa/src/main/resources/META-INF/create-db.sql @@ -0,0 +1,3 @@ +create table Game (id bigint not null, name varchar(255), primary key (id)); +create table Player (id bigint not null, name varchar(255), game_id bigint, primary key (id)); +alter table Player add constraint FKohr86afuapoujklti79wo27aa foreign key (game_id) references Game(id); \ No newline at end of file diff --git a/persistence-modules/hibernate-jpa/src/main/resources/META-INF/data.sql b/persistence-modules/hibernate-jpa/src/main/resources/META-INF/data.sql new file mode 100644 index 0000000000..1e83082801 --- /dev/null +++ b/persistence-modules/hibernate-jpa/src/main/resources/META-INF/data.sql @@ -0,0 +1,5 @@ +insert into Game (id, name) values (1, 'Game 1'); +insert into Game (id, name) values (2, 'Game 2'); +insert into Player (game_id, name, id) values (null, 'Player 1', 1); +insert into Player (game_id, name, id) values (null, 'Player 2', 2); +insert into Player (game_id, name, id) values (null, 'Player 3', 3); \ No newline at end of file diff --git a/persistence-modules/hibernate-jpa/src/main/resources/META-INF/drop-db.sql b/persistence-modules/hibernate-jpa/src/main/resources/META-INF/drop-db.sql new file mode 100644 index 0000000000..275324fcae --- /dev/null +++ b/persistence-modules/hibernate-jpa/src/main/resources/META-INF/drop-db.sql @@ -0,0 +1,2 @@ +drop table if exists Player; +drop table if exists Game; \ No newline at end of file diff --git a/persistence-modules/hibernate-jpa/src/main/resources/META-INF/persistence.xml b/persistence-modules/hibernate-jpa/src/main/resources/META-INF/persistence.xml index 4dfade1af3..c2d5bf59ab 100644 --- a/persistence-modules/hibernate-jpa/src/main/resources/META-INF/persistence.xml +++ b/persistence-modules/hibernate-jpa/src/main/resources/META-INF/persistence.xml @@ -5,7 +5,7 @@ version="2.0"> Hibernate EntityManager Demo - com.baeldung.hibernate.pojo.Movie + com.baeldung.hibernate.pojo.Movie true @@ -16,4 +16,88 @@ + + + EntityManager getReference persistence unit + com.baeldung.hibernate.entitymanager.getreference.Game + com.baeldung.hibernate.entitymanager.getreference.Player + true + + + + + + + + + + + + + + + + + + + EntityManager getReference persistence unit + com.baeldung.hibernate.entitymanager.getreference.Game + com.baeldung.hibernate.entitymanager.getreference.Player + true + + + + + + + + + + + + + + + + + + + + + + + + + EntityManager getReference persistence unit + com.baeldung.hibernate.entitymanager.getreference.Game + com.baeldung.hibernate.entitymanager.getreference.Player + true + + + + + + + + + + + + + + + + + + + + + + \ No newline at end of file diff --git a/persistence-modules/hibernate-jpa/src/test/java/com/baeldung/hibernate/entitymanager/getreference/GetReferenceH2IntegrationTest.java b/persistence-modules/hibernate-jpa/src/test/java/com/baeldung/hibernate/entitymanager/getreference/GetReferenceH2IntegrationTest.java new file mode 100644 index 0000000000..e8e6aeed7c --- /dev/null +++ b/persistence-modules/hibernate-jpa/src/test/java/com/baeldung/hibernate/entitymanager/getreference/GetReferenceH2IntegrationTest.java @@ -0,0 +1,194 @@ +package com.baeldung.hibernate.entitymanager.getreference; + +import ch.qos.logback.classic.Level; +import ch.qos.logback.classic.Logger; +import org.junit.jupiter.api.*; +import org.slf4j.LoggerFactory; + +import javax.persistence.EntityManager; +import javax.persistence.EntityManagerFactory; +import javax.persistence.Persistence; +import java.io.ByteArrayOutputStream; +import java.io.OutputStream; +import java.io.PrintStream; + +import static org.junit.jupiter.api.Assertions.assertEquals; + +public class GetReferenceH2IntegrationTest { + + private static EntityManagerFactory entityManagerFactory; + private static EntityManager entityManager; + + private static final PrintStream SystemOut = System.out; + private static OutputStream output; + + @BeforeAll + public static void setup() { + // close some specific loggers so that we can clearly see Hibernate: SQL queries + ((Logger) LoggerFactory.getLogger("org.hibernate.SQL")).setLevel(Level.OFF); + ((Logger) LoggerFactory.getLogger("org.hibernate.type.descriptor.sql")).setLevel(Level.OFF); + ((Logger) LoggerFactory.getLogger("org.hibernate.stat")).setLevel(Level.OFF); + + entityManagerFactory = Persistence.createEntityManagerFactory("com.baeldung.hibernate.entitymanager.game_player_h2"); + entityManager = entityManagerFactory.createEntityManager(); + entityManager.getTransaction().begin(); + + entityManager.persist(new Game(1L, "Game 1")); + entityManager.persist(new Game(2L, "Game 2")); + entityManager.persist(new Player(1L, "Player 1")); + entityManager.persist(new Player(2L, "Player 2")); + entityManager.persist(new Player(3L, "Player 3")); + + entityManager.getTransaction().commit(); + entityManager.clear(); + entityManager.close(); + } + + private void runInTransaction(Runnable task) { + // We create new persistence context for each test method to discard Hibernate first level cache. + // So that we can see the behavior of getReference() method in a non-cached environment. + entityManager = entityManagerFactory.createEntityManager(); + entityManager.getTransaction().begin(); + task.run(); + entityManager.getTransaction().commit(); + // In any case, we use clear() and close() to make all the managed entities detached and cleared. + // So, we can be sure we test always on a clear persistence context. + entityManager.clear(); + entityManager.close(); + } + + @BeforeEach + public void beforeEach() { + // stubbing System.out printStream + output = new ByteArrayOutputStream(); + System.setOut(new PrintStream(output)); + } + + @AfterEach + public void afterEach() { + System.setOut(SystemOut); + // we print to see original output after each test method + System.out.print(output.toString()); + } + + @AfterAll + public static void tearDown() { + entityManagerFactory.close(); + } + + @Test + public void whenUsingFindMethodToUpdateGame_thenExecutesSelectForGame() { + + runInTransaction(() -> { + Game game1 = entityManager.find(Game.class, 1L); + game1.setName("Game Updated 1"); + + entityManager.persist(game1); + }); + + StringBuilder expected = new StringBuilder(); + expected.append("Hibernate: select game0_.id as id1_0_0_, game0_.name as name2_0_0_ from Game game0_ where game0_.id=?\n"); + expected.append("Hibernate: update Game set name=? where id=?\n"); + + assertEquals(expected.toString(), output.toString()); + } + + @Test + public void whenUsingGetReferenceMethodToUpdateGame_thenExecutesSelectForGame() { + + runInTransaction(() -> { + Game game1 = entityManager.getReference(Game.class, 1L); + game1.setName("Game Updated 2"); + + entityManager.persist(game1); + }); + + StringBuilder expected = new StringBuilder(); + expected.append("Hibernate: select game0_.id as id1_0_0_, game0_.name as name2_0_0_ from Game game0_ where game0_.id=?\n"); + expected.append("Hibernate: update Game set name=? where id=?\n"); + + assertEquals(expected.toString(), output.toString()); + } + + @Test + public void whenUsingFindMethodToDeletePlayer_thenExecutesSelectForPlayer() { + + runInTransaction(() -> { + Player player2 = entityManager.find(Player.class, 2L); + entityManager.remove(player2); + }); + + StringBuilder expected = new StringBuilder(); + expected.append("Hibernate: select "); + expected.append("player0_.id as id1_1_0_, player0_.game_id as game_id3_1_0_, "); + expected.append("player0_.name as name2_1_0_, game1_.id as id1_0_1_, game1_.name as name2_0_1_ "); + expected.append("from Player player0_ left outer join Game game1_ on player0_.game_id=game1_.id where player0_.id=?\n"); + expected.append("Hibernate: delete from Player where id=?\n"); + + assertEquals(expected.toString(), output.toString()); + } + + @Test + public void whenUsingGetReferenceMethodToDeletePlayer_thenExecutesSelectForPlayer() { + + runInTransaction(() -> { + Player player3 = entityManager.getReference(Player.class, 3L); + entityManager.remove(player3); + }); + + StringBuilder expected = new StringBuilder(); + expected.append("Hibernate: select "); + expected.append("player0_.id as id1_1_0_, player0_.game_id as game_id3_1_0_, "); + expected.append("player0_.name as name2_1_0_, game1_.id as id1_0_1_, game1_.name as name2_0_1_ "); + expected.append("from Player player0_ left outer join Game game1_ on player0_.game_id=game1_.id where player0_.id=?\n"); + expected.append("Hibernate: delete from Player where id=?\n"); + + assertEquals(expected.toString(), output.toString()); + } + + @Test + public void whenUsingFindMethodToUpdatePlayersGame_thenExecutesSelectForGame() { + + runInTransaction((() -> { + Game game1 = entityManager.find(Game.class, 1L); + + Player player1 = entityManager.find(Player.class, 1L); + player1.setGame(game1); + + entityManager.persist(player1); + })); + + StringBuilder expected = new StringBuilder(); + expected.append("Hibernate: select game0_.id as id1_0_0_, game0_.name as name2_0_0_ from Game game0_ where game0_.id=?\n"); + expected.append("Hibernate: select "); + expected.append("player0_.id as id1_1_0_, player0_.game_id as game_id3_1_0_, "); + expected.append("player0_.name as name2_1_0_, game1_.id as id1_0_1_, game1_.name as name2_0_1_ "); + expected.append("from Player player0_ left outer join Game game1_ on player0_.game_id=game1_.id where player0_.id=?\n"); + expected.append("Hibernate: update Player set game_id=?, name=? where id=?\n"); + + assertEquals(expected.toString(), output.toString()); + } + + @Test + public void whenUsingGetReferenceMethodToUpdatePlayersGame_thenDoesNotExecuteSelectForGame() { + + runInTransaction(() -> { + Game game2 = entityManager.getReference(Game.class, 2L); + + Player player1 = entityManager.find(Player.class, 1L); + player1.setGame(game2); + + entityManager.persist(player1); + }); + + StringBuilder expected = new StringBuilder(); + expected.append("Hibernate: select "); + expected.append("player0_.id as id1_1_0_, player0_.game_id as game_id3_1_0_, "); + expected.append("player0_.name as name2_1_0_, game1_.id as id1_0_1_, game1_.name as name2_0_1_ "); + expected.append("from Player player0_ left outer join Game game1_ on player0_.game_id=game1_.id where player0_.id=?\n"); + expected.append("Hibernate: update Player set game_id=?, name=? where id=?\n"); + + assertEquals(expected.toString(), output.toString()); + } + +} diff --git a/persistence-modules/hibernate-jpa/src/test/java/com/baeldung/hibernate/entitymanager/getreference/GetReferenceMySQLManualTest.java b/persistence-modules/hibernate-jpa/src/test/java/com/baeldung/hibernate/entitymanager/getreference/GetReferenceMySQLManualTest.java new file mode 100644 index 0000000000..2b7c5e8119 --- /dev/null +++ b/persistence-modules/hibernate-jpa/src/test/java/com/baeldung/hibernate/entitymanager/getreference/GetReferenceMySQLManualTest.java @@ -0,0 +1,185 @@ +package com.baeldung.hibernate.entitymanager.getreference; + +import ch.qos.logback.classic.Level; +import ch.qos.logback.classic.Logger; +import org.junit.jupiter.api.*; +import org.slf4j.LoggerFactory; + +import javax.persistence.EntityManager; +import javax.persistence.EntityManagerFactory; +import javax.persistence.Persistence; +import java.io.ByteArrayOutputStream; +import java.io.OutputStream; +import java.io.PrintStream; + +import static org.junit.jupiter.api.Assertions.assertEquals; + +/** + * We need to have a running MySQL instance and a schema named "baeldung" ready in order to execute this integration test + */ +public class GetReferenceMySQLManualTest { + + private static EntityManagerFactory entityManagerFactory; + private static EntityManager entityManager; + + private static final PrintStream SystemOut = System.out; + private static OutputStream output; + + @BeforeAll + public static void setup() { + // close some specific loggers so that we can clearly see Hibernate: SQL queries + ((Logger) LoggerFactory.getLogger("org.hibernate.SQL")).setLevel(Level.OFF); + ((Logger) LoggerFactory.getLogger("org.hibernate.type.descriptor.sql")).setLevel(Level.OFF); + ((Logger) LoggerFactory.getLogger("org.hibernate.stat")).setLevel(Level.OFF); + + entityManagerFactory = Persistence.createEntityManagerFactory("com.baeldung.hibernate.entitymanager.game_player_mysql"); + } + + private void runInTransaction(Runnable task) { + // We create new persistence context for each test method to discard Hibernate first level cache. + // So that we can see the behavior of getReference() method in a non-cached environment. + entityManager = entityManagerFactory.createEntityManager(); + entityManager.getTransaction().begin(); + task.run(); + entityManager.getTransaction().commit(); + // In any case, we use clear() and close() to make all the managed entities detached and cleared. + // So, we can be sure we test always on a clear persistence context. + entityManager.clear(); + entityManager.close(); + } + + @BeforeEach + public void beforeEach() { + // stubbing System.out printStream + output = new ByteArrayOutputStream(); + System.setOut(new PrintStream(output)); + } + + @AfterEach + public void afterEach() { + System.setOut(SystemOut); + // we print to see original output after each test method + System.out.print(output.toString()); + } + + @AfterAll + public static void tearDown() { + entityManagerFactory.close(); + } + + @Test + public void whenUsingFindMethodToUpdateGame_thenExecutesSelectForGame() { + + runInTransaction(() -> { + Game game1 = entityManager.find(Game.class, 1L); + game1.setName("Game Updated 1"); + + entityManager.persist(game1); + }); + + StringBuilder expected = new StringBuilder(); + expected.append("Hibernate: select game0_.id as id1_0_0_, game0_.name as name2_0_0_ from Game game0_ where game0_.id=?\n"); + expected.append("Hibernate: update Game set name=? where id=?\n"); + + assertEquals(expected.toString(), output.toString()); + } + + @Test + public void whenUsingGetReferenceMethodToUpdateGame_thenExecutesSelectForGame() { + + runInTransaction(() -> { + Game game1 = entityManager.getReference(Game.class, 1L); + game1.setName("Game Updated 2"); + + entityManager.persist(game1); + }); + + StringBuilder expected = new StringBuilder(); + expected.append("Hibernate: select game0_.id as id1_0_0_, game0_.name as name2_0_0_ from Game game0_ where game0_.id=?\n"); + expected.append("Hibernate: update Game set name=? where id=?\n"); + + assertEquals(expected.toString(), output.toString()); + } + + @Test + public void whenUsingFindMethodToDeletePlayer_thenExecutesSelectForPlayer() { + + runInTransaction(() -> { + Player player2 = entityManager.find(Player.class, 2L); + entityManager.remove(player2); + }); + + StringBuilder expected = new StringBuilder(); + expected.append("Hibernate: select "); + expected.append("player0_.id as id1_1_0_, player0_.game_id as game_id3_1_0_, "); + expected.append("player0_.name as name2_1_0_, game1_.id as id1_0_1_, game1_.name as name2_0_1_ "); + expected.append("from Player player0_ left outer join Game game1_ on player0_.game_id=game1_.id where player0_.id=?\n"); + expected.append("Hibernate: delete from Player where id=?\n"); + + assertEquals(expected.toString(), output.toString()); + } + + @Test + public void whenUsingGetReferenceMethodToDeletePlayer_thenExecutesSelectForPlayer() { + + runInTransaction(() -> { + Player player3 = entityManager.getReference(Player.class, 3L); + entityManager.remove(player3); + }); + + StringBuilder expected = new StringBuilder(); + expected.append("Hibernate: select "); + expected.append("player0_.id as id1_1_0_, player0_.game_id as game_id3_1_0_, "); + expected.append("player0_.name as name2_1_0_, game1_.id as id1_0_1_, game1_.name as name2_0_1_ "); + expected.append("from Player player0_ left outer join Game game1_ on player0_.game_id=game1_.id where player0_.id=?\n"); + expected.append("Hibernate: delete from Player where id=?\n"); + + assertEquals(expected.toString(), output.toString()); + } + + @Test + public void whenUsingFindMethodToUpdatePlayersGame_thenExecutesSelectForGame() { + + runInTransaction((() -> { + Game game1 = entityManager.find(Game.class, 1L); + + Player player1 = entityManager.find(Player.class, 1L); + player1.setGame(game1); + + entityManager.persist(player1); + })); + + StringBuilder expected = new StringBuilder(); + expected.append("Hibernate: select game0_.id as id1_0_0_, game0_.name as name2_0_0_ from Game game0_ where game0_.id=?\n"); + expected.append("Hibernate: select "); + expected.append("player0_.id as id1_1_0_, player0_.game_id as game_id3_1_0_, "); + expected.append("player0_.name as name2_1_0_, game1_.id as id1_0_1_, game1_.name as name2_0_1_ "); + expected.append("from Player player0_ left outer join Game game1_ on player0_.game_id=game1_.id where player0_.id=?\n"); + expected.append("Hibernate: update Player set game_id=?, name=? where id=?\n"); + + assertEquals(expected.toString(), output.toString()); + } + + @Test + public void whenUsingGetReferenceMethodToUpdatePlayersGame_thenDoesNotExecuteSelectForGame() { + + runInTransaction(() -> { + Game game2 = entityManager.getReference(Game.class, 2L); + + Player player1 = entityManager.find(Player.class, 1L); + player1.setGame(game2); + + entityManager.persist(player1); + }); + + StringBuilder expected = new StringBuilder(); + expected.append("Hibernate: select "); + expected.append("player0_.id as id1_1_0_, player0_.game_id as game_id3_1_0_, "); + expected.append("player0_.name as name2_1_0_, game1_.id as id1_0_1_, game1_.name as name2_0_1_ "); + expected.append("from Player player0_ left outer join Game game1_ on player0_.game_id=game1_.id where player0_.id=?\n"); + expected.append("Hibernate: update Player set game_id=?, name=? where id=?\n"); + + assertEquals(expected.toString(), output.toString()); + } + +} diff --git a/persistence-modules/hibernate-jpa/src/test/java/com/baeldung/hibernate/entitymanager/getreference/GetReferencePostgreSQLManualTest.java b/persistence-modules/hibernate-jpa/src/test/java/com/baeldung/hibernate/entitymanager/getreference/GetReferencePostgreSQLManualTest.java new file mode 100644 index 0000000000..17f6b10b8a --- /dev/null +++ b/persistence-modules/hibernate-jpa/src/test/java/com/baeldung/hibernate/entitymanager/getreference/GetReferencePostgreSQLManualTest.java @@ -0,0 +1,185 @@ +package com.baeldung.hibernate.entitymanager.getreference; + +import ch.qos.logback.classic.Level; +import ch.qos.logback.classic.Logger; +import org.junit.jupiter.api.*; +import org.slf4j.LoggerFactory; + +import javax.persistence.EntityManager; +import javax.persistence.EntityManagerFactory; +import javax.persistence.Persistence; +import java.io.ByteArrayOutputStream; +import java.io.OutputStream; +import java.io.PrintStream; + +import static org.junit.jupiter.api.Assertions.assertEquals; + +/** + * We need to have a running PostgreSQL instance in order to execute this integration test + */ +public class GetReferencePostgreSQLManualTest { + + private static EntityManagerFactory entityManagerFactory; + private static EntityManager entityManager; + + private static final PrintStream SystemOut = System.out; + private static OutputStream output; + + @BeforeAll + public static void setup() { + // close some specific loggers so that we can clearly see Hibernate: SQL queries + ((Logger) LoggerFactory.getLogger("org.hibernate.SQL")).setLevel(Level.OFF); + ((Logger) LoggerFactory.getLogger("org.hibernate.type.descriptor.sql")).setLevel(Level.OFF); + ((Logger) LoggerFactory.getLogger("org.hibernate.stat")).setLevel(Level.OFF); + + entityManagerFactory = Persistence.createEntityManagerFactory("com.baeldung.hibernate.entitymanager.game_player_postgresql"); + } + + private void runInTransaction(Runnable task) { + // We create new persistence context for each test method to discard Hibernate first level cache. + // So that we can see the behavior of getReference() method in a non-cached environment. + entityManager = entityManagerFactory.createEntityManager(); + entityManager.getTransaction().begin(); + task.run(); + entityManager.getTransaction().commit(); + // In any case, we use clear() and close() to make all the managed entities detached and cleared. + // So, we can be sure we test always on a clear persistence context. + entityManager.clear(); + entityManager.close(); + } + + @BeforeEach + public void beforeEach() { + // stubbing System.out printStream + output = new ByteArrayOutputStream(); + System.setOut(new PrintStream(output)); + } + + @AfterEach + public void afterEach() { + System.setOut(SystemOut); + // we print to see original output after each test method + System.out.print(output.toString()); + } + + @AfterAll + public static void tearDown() { + entityManagerFactory.close(); + } + + @Test + public void whenUsingFindMethodToUpdateGame_thenExecutesSelectForGame() { + + runInTransaction(() -> { + Game game1 = entityManager.find(Game.class, 1L); + game1.setName("Game Updated 1"); + + entityManager.persist(game1); + }); + + StringBuilder expected = new StringBuilder(); + expected.append("Hibernate: select game0_.id as id1_0_0_, game0_.name as name2_0_0_ from Game game0_ where game0_.id=?\n"); + expected.append("Hibernate: update Game set name=? where id=?\n"); + + assertEquals(expected.toString(), output.toString()); + } + + @Test + public void whenUsingGetReferenceMethodToUpdateGame_thenExecutesSelectForGame() { + + runInTransaction(() -> { + Game game1 = entityManager.getReference(Game.class, 1L); + game1.setName("Game Updated 2"); + + entityManager.persist(game1); + }); + + StringBuilder expected = new StringBuilder(); + expected.append("Hibernate: select game0_.id as id1_0_0_, game0_.name as name2_0_0_ from Game game0_ where game0_.id=?\n"); + expected.append("Hibernate: update Game set name=? where id=?\n"); + + assertEquals(expected.toString(), output.toString()); + } + + @Test + public void whenUsingFindMethodToDeletePlayer_thenExecutesSelectForPlayer() { + + runInTransaction(() -> { + Player player2 = entityManager.find(Player.class, 2L); + entityManager.remove(player2); + }); + + StringBuilder expected = new StringBuilder(); + expected.append("Hibernate: select "); + expected.append("player0_.id as id1_1_0_, player0_.game_id as game_id3_1_0_, "); + expected.append("player0_.name as name2_1_0_, game1_.id as id1_0_1_, game1_.name as name2_0_1_ "); + expected.append("from Player player0_ left outer join Game game1_ on player0_.game_id=game1_.id where player0_.id=?\n"); + expected.append("Hibernate: delete from Player where id=?\n"); + + assertEquals(expected.toString(), output.toString()); + } + + @Test + public void whenUsingGetReferenceMethodToDeletePlayer_thenExecutesSelectForPlayer() { + + runInTransaction(() -> { + Player player3 = entityManager.getReference(Player.class, 3L); + entityManager.remove(player3); + }); + + StringBuilder expected = new StringBuilder(); + expected.append("Hibernate: select "); + expected.append("player0_.id as id1_1_0_, player0_.game_id as game_id3_1_0_, "); + expected.append("player0_.name as name2_1_0_, game1_.id as id1_0_1_, game1_.name as name2_0_1_ "); + expected.append("from Player player0_ left outer join Game game1_ on player0_.game_id=game1_.id where player0_.id=?\n"); + expected.append("Hibernate: delete from Player where id=?\n"); + + assertEquals(expected.toString(), output.toString()); + } + + @Test + public void whenUsingFindMethodToUpdatePlayersGame_thenExecutesSelectForGame() { + + runInTransaction((() -> { + Game game1 = entityManager.find(Game.class, 1L); + + Player player1 = entityManager.find(Player.class, 1L); + player1.setGame(game1); + + entityManager.persist(player1); + })); + + StringBuilder expected = new StringBuilder(); + expected.append("Hibernate: select game0_.id as id1_0_0_, game0_.name as name2_0_0_ from Game game0_ where game0_.id=?\n"); + expected.append("Hibernate: select "); + expected.append("player0_.id as id1_1_0_, player0_.game_id as game_id3_1_0_, "); + expected.append("player0_.name as name2_1_0_, game1_.id as id1_0_1_, game1_.name as name2_0_1_ "); + expected.append("from Player player0_ left outer join Game game1_ on player0_.game_id=game1_.id where player0_.id=?\n"); + expected.append("Hibernate: update Player set game_id=?, name=? where id=?\n"); + + assertEquals(expected.toString(), output.toString()); + } + + @Test + public void whenUsingGetReferenceMethodToUpdatePlayersGame_thenDoesNotExecuteSelectForGame() { + + runInTransaction(() -> { + Game game2 = entityManager.getReference(Game.class, 2L); + + Player player1 = entityManager.find(Player.class, 1L); + player1.setGame(game2); + + entityManager.persist(player1); + }); + + StringBuilder expected = new StringBuilder(); + expected.append("Hibernate: select "); + expected.append("player0_.id as id1_1_0_, player0_.game_id as game_id3_1_0_, "); + expected.append("player0_.name as name2_1_0_, game1_.id as id1_0_1_, game1_.name as name2_0_1_ "); + expected.append("from Player player0_ left outer join Game game1_ on player0_.game_id=game1_.id where player0_.id=?\n"); + expected.append("Hibernate: update Player set game_id=?, name=? where id=?\n"); + + assertEquals(expected.toString(), output.toString()); + } + +}