-
Notifications
You must be signed in to change notification settings - Fork 481
/
MultiLevelCollectionFetchingTest.java
366 lines (284 loc) · 8.87 KB
/
MultiLevelCollectionFetchingTest.java
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
package com.vladmihalcea.hpjp.hibernate.fetching.multiple;
import com.vladmihalcea.hpjp.util.AbstractPostgreSQLIntegrationTest;
import org.junit.Test;
import jakarta.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 MultiLevelCollectionFetchingTest extends AbstractPostgreSQLIntegrationTest {
public static final int POST_COUNT = 50;
public static final int POST_COMMENT_COUNT = 20;
public static final int TAG_COUNT = 10;
public static final int VOTE_COUNT = 5;
@Override
protected Class<?>[] entities() {
return new Class<?>[]{
Post.class,
PostComment.class,
Tag.class,
User.class,
UserVote.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 -> {
User alice = new User()
.setId(1L)
.setName("Alice");
User bob = new User()
.setId(2L)
.setName("Bob");
entityManager.persist(alice);
entityManager.persist(bob);
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;
long voteId = 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++) {
PostComment comment = new PostComment()
.setId(++commentId)
.setReview("Excellent!");
for (int j = 0; j < VOTE_COUNT; j++) {
comment.addVote(
new UserVote()
.setId(++voteId)
.setScore(Math.random() > 0.5 ? 1 : -1)
.setUser(Math.random() > 0.5 ? alice : bob)
);
}
post.addComment(comment);
}
for (int i = 0; i < TAG_COUNT; i++) {
post.getTags().add(tags.get(i));
}
entityManager.persist(post);
}
});
}
@Test
public void testTwoJoinFetchQueries() {
List<Post> posts = doInJPA(entityManager -> {
List<Post> _posts = entityManager.createQuery("""
select p
from Post p
left join fetch p.comments
where p.id between :minId and :maxId
""", Post.class)
.setParameter("minId", 1L)
.setParameter("maxId", 50L)
.getResultList();
entityManager.createQuery("""
select p
from Post p
left join fetch p.tags t
where p in :posts
""", Post.class)
.setParameter("posts", _posts)
.getResultList();
entityManager.createQuery("""
select pc
from PostComment pc
left join fetch pc.votes v
join pc.post p
where p in :posts
""", PostComment.class)
.setParameter("posts", _posts)
.getResultList();
return _posts;
});
assertEquals(POST_COUNT, posts.size());
for (Post post : posts) {
assertEquals(POST_COMMENT_COUNT, post.getComments().size());
for(PostComment comment : post.getComments()) {
assertEquals(VOTE_COUNT, comment.getVotes().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;
@OneToMany(mappedBy = "comment", cascade = CascadeType.ALL, orphanRemoval = true)
private List<UserVote> votes = new ArrayList<>();
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;
}
public List<UserVote> getVotes() {
return votes;
}
public PostComment addVote(UserVote vote) {
votes.add(vote);
vote.setComment(this);
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;
}
}
@Entity(name = "User")
@Table(name = "blog_user")
public static class User {
@Id
private Long id;
private String name;
public Long getId() {
return id;
}
public User setId(Long id) {
this.id = id;
return this;
}
public String getName() {
return name;
}
public User setName(String name) {
this.name = name;
return this;
}
}
@Entity(name = "UserVote")
@Table(name = "user_vote")
public static class UserVote {
@Id
private Long id;
@ManyToOne(fetch = FetchType.LAZY)
private User user;
@ManyToOne(fetch = FetchType.LAZY)
private PostComment comment;
private int score;
public Long getId() {
return id;
}
public UserVote setId(Long id) {
this.id = id;
return this;
}
public User getUser() {
return user;
}
public UserVote setUser(User user) {
this.user = user;
return this;
}
public PostComment getComment() {
return comment;
}
public UserVote setComment(PostComment comment) {
this.comment = comment;
return this;
}
public int getScore() {
return score;
}
public UserVote setScore(int score) {
this.score = score;
return this;
}
}
}