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EagerFetchingMultipleBagTest.java
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EagerFetchingMultipleBagTest.java
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package com.vladmihalcea.book.hpjp.hibernate.fetching.multiple;
import com.vladmihalcea.book.hpjp.util.AbstractPostgreSQLIntegrationTest;
import com.vladmihalcea.book.hpjp.util.exception.ExceptionUtil;
import org.hibernate.annotations.QueryHints;
import org.hibernate.loader.MultipleBagFetchException;
import org.junit.Test;
import javax.persistence.*;
import java.util.ArrayList;
import java.util.List;
import java.util.Properties;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
/**
* @author Vlad Mihalcea
*/
public class EagerFetchingMultipleBagTest extends AbstractPostgreSQLIntegrationTest {
public static final int POST_COUNT = 50;
public static final int POST_COMMENT_COUNT = 20;
public static final int TAG_COUNT = 10;
@Override
protected Class<?>[] entities() {
return new Class<?>[]{
Post.class,
PostComment.class,
Tag.class
};
}
@Override
protected void additionalProperties(Properties properties) {
properties.put("hibernate.jdbc.batch_size", "50");
properties.put("hibernate.order_inserts", "true");
properties.put("hibernate.order_updates", "true");
}
@Override
public void afterInit() {
doInJPA(entityManager -> {
List<Tag> tags = new ArrayList<>();
for (long i = 1; i <= TAG_COUNT; i++) {
Tag tag = new Tag()
.setId(i)
.setName(String.format("Tag nr. %d", i));
entityManager.persist(tag);
tags.add(tag);
}
long commentId = 0;
for (long postId = 1; postId <= POST_COUNT; postId++) {
Post post = new Post()
.setId(postId)
.setTitle(String.format("Post nr. %d", postId));
for (long i = 0; i < POST_COMMENT_COUNT; i++) {
post.addComment(
new PostComment()
.setId(++commentId)
.setReview("Excellent!")
);
}
for (int i = 0; i < TAG_COUNT; i++) {
post.getTags().add(tags.get(i));
}
entityManager.persist(post);
}
});
}
@Test
public void testOneQueryTwoJoinFetch() {
try {
doInJPA(entityManager -> {
List<Post> posts = entityManager.createQuery("""
select p
from Post p
left join fetch p.comments
left join fetch p.tags
where p.id between :minId and :maxId
""", Post.class)
.setParameter("minId", 1L)
.setParameter("maxId", 50L)
.getResultList();
});
} catch (Exception e) {
assertTrue(
MultipleBagFetchException.class.isAssignableFrom(
ExceptionUtil.rootCause(e).getClass()
)
);
LOGGER.error("Failure", e);
}
}
@Test
public void testTwoJoinFetchQueries() {
List<Post> _posts = doInJPA(entityManager -> {
List<Post> posts = entityManager.createQuery("""
select distinct p
from Post p
left join fetch p.comments
where p.id between :minId and :maxId""", Post.class)
.setParameter("minId", 1L)
.setParameter("maxId", 50L)
.setHint(QueryHints.PASS_DISTINCT_THROUGH, false)
.getResultList();
posts = entityManager.createQuery("""
select distinct p
from Post p
left join fetch p.tags t
where p in :posts""", Post.class)
.setParameter("posts", posts)
.setHint(QueryHints.PASS_DISTINCT_THROUGH, false)
.getResultList();
assertEquals(POST_COUNT, posts.size());
return posts;
});
for(Post post : _posts) {
assertEquals(POST_COMMENT_COUNT, post.getComments().size());
assertEquals(TAG_COUNT, post.getTags().size());
}
}
@Test
public void testTwoJoinFetchQueriesWithoutInClause() {
List<Post> _posts = doInJPA(entityManager -> {
List<Post> posts = entityManager.createQuery("""
select distinct p
from Post p
left join fetch p.comments
where p.id between :minId and :maxId""", Post.class)
.setParameter("minId", 1L)
.setParameter("maxId", 50L)
.setHint(QueryHints.PASS_DISTINCT_THROUGH, false)
.getResultList();
posts = entityManager.createQuery("""
select distinct p
from Post p
left join fetch p.tags t
where p.id between :minId and :maxId""", Post.class)
.setParameter("minId", 1L)
.setParameter("maxId", 50L)
.setHint(QueryHints.PASS_DISTINCT_THROUGH, false)
.getResultList();
assertEquals(POST_COUNT, posts.size());
return posts;
});
for(Post post : _posts) {
assertEquals(POST_COMMENT_COUNT, post.getComments().size());
assertEquals(TAG_COUNT, post.getTags().size());
}
}
@Entity(name = "Post")
@Table(name = "post")
public static class Post {
@Id
private Long id;
private String title;
@OneToMany(mappedBy = "post", cascade = CascadeType.ALL, orphanRemoval = true)
private List<PostComment> comments = new ArrayList<>();
@ManyToMany(cascade = {CascadeType.PERSIST, CascadeType.MERGE})
@JoinTable(name = "post_tag",
joinColumns = @JoinColumn(name = "post_id"),
inverseJoinColumns = @JoinColumn(name = "tag_id")
)
private List<Tag> tags = new ArrayList<>();
public Long getId() {
return id;
}
public Post setId(Long id) {
this.id = id;
return this;
}
public String getTitle() {
return title;
}
public Post setTitle(String title) {
this.title = title;
return this;
}
public List<PostComment> getComments() {
return comments;
}
public Post addComment(PostComment comment) {
comments.add(comment);
comment.setPost(this);
return this;
}
public List<Tag> getTags() {
return tags;
}
public void setTags(List<Tag> tags) {
this.tags = tags;
}
}
@Entity(name = "PostComment")
@Table(name = "post_comment")
public static class PostComment {
@Id
private Long id;
@ManyToOne(fetch = FetchType.LAZY)
private Post post;
private String review;
public Long getId() {
return id;
}
public PostComment setId(Long id) {
this.id = id;
return this;
}
public Post getPost() {
return post;
}
public PostComment setPost(Post post) {
this.post = post;
return this;
}
public String getReview() {
return review;
}
public PostComment setReview(String review) {
this.review = review;
return this;
}
}
@Entity(name = "Tag")
@Table(name = "tag")
public static class Tag {
@Id
private Long id;
private String name;
public Long getId() {
return id;
}
public Tag setId(Long id) {
this.id = id;
return this;
}
public String getName() {
return name;
}
public Tag setName(String name) {
this.name = name;
return this;
}
}
}