Hibernate дублирует запрос
При выполнении count
запроса Hibernate
почему-то дублирует его. Это не похоже на проблему N+1, ведь он не выбирает никаких дочерних сущностей, а просто повторяет один и тот же запрос один-в-один. Почему и как это исправить?
Вот часть стэктрейса:
Hibernate: select ct1_0.author_id,ct1_0.id,ct1_0.created_at,ct1_0.description,ct1_0.edited_at,e1_0.id,e1_0.email,e1_0.name,e1_0.password,e1_0.registration_date,ct1_0.priority,ct1_0.status,ct1_0.title from tasks ct1_0 left join people e1_0 on e1_0.id=ct1_0.executor_id where ct1_0.author_id=?
0
2024-03-25T02:31:44.491+03:00 DEBUG 21948 --- [TaskManager] [nio-8080-exec-1] org.hibernate.SQL :
select
count(c1_0.id)
from
comments c1_0
left join
tasks t1_0
on t1_0.id=c1_0.task_id
where
t1_0.id=?
Hibernate:
select
count(c1_0.id)
from
comments c1_0
left join
tasks t1_0
on t1_0.id=c1_0.task_id
where
t1_0.id=?
1
2024-03-25T02:31:44.493+03:00 DEBUG 21948 --- [TaskManager] [nio-8080-exec-1] org.hibernate.SQL :
select
count(c1_0.id)
from
comments c1_0
left join
tasks t1_0
on t1_0.id=c1_0.task_id
where
t1_0.id=?
Hibernate:
select
count(c1_0.id)
from
comments c1_0
left join
tasks t1_0
on t1_0.id=c1_0.task_id
where
t1_0.id=?
2
2024-03-25T02:31:44.495+03:00 DEBUG 21948 --- [TaskManager] [nio-8080-exec-1] org.hibernate.SQL :
select
count(c1_0.id)
from
comments c1_0
left join
tasks t1_0
on t1_0.id=c1_0.task_id
where
t1_0.id=?
Hibernate:
select
count(c1_0.id)
from
comments c1_0
left join
tasks t1_0
on t1_0.id=c1_0.task_id
where
t1_0.id=?
3
Цикл в методе контроллера, где происходит дублирование:
int i = 0;
for (JsonNode node : tasksNode) {
System.out.println(i++);
int commentsCount = commentService.countByTask(node.get("id").asInt()); // В этой строке происходит дублирование запроса
((ObjectNode)node).set("comments", objectMapper.convertValue(commentsCount + " comments, "
+ (int) (Math.ceil((double) commentsCount / PAGE_SIZE)) + " pages", JsonNode.class)); // *
}
Я пробовал закомментировать строку, помеченную звездочкой - это не решило проблему.
В сервисе:
public Integer countByTask(long id) {
return commentRepository.countByTask_id(id);
}
В репозитории:
Integer countByTask_id(long id);
pom.xml:
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>3.2.3</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>ru.terentyev</groupId>
<artifactId>TaskManager</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>war</packaging>
<name>TaskManager</name>
<description>Web + REST Task Manager</description>
<properties>
<java.version>20</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-security</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-validation</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.thymeleaf.extras</groupId>
<artifactId>thymeleaf-extras-springsecurity6</artifactId>
</dependency>
<dependency>
<groupId>org.postgresql</groupId>
<artifactId>postgresql</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-tomcat</artifactId>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.security</groupId>
<artifactId>spring-security-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>com.github.java-json-tools</groupId>
<artifactId>json-patch</artifactId>
<version>1.13</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.datatype</groupId>
<artifactId>jackson-datatype-hibernate5</artifactId>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.datatype</groupId>
<artifactId>jackson-datatype-hibernate6</artifactId>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>