Spring boot spring数据jdbc:包含与JOOQ的1-n关系的查询实体
我试图在JOOQ(基于spring数据jdbc)的帮助下加载包含对另一个实体(1-n)的引用的实体 我已经开始延长时间了 具有1-n关系的调整模型:Spring boot spring数据jdbc:包含与JOOQ的1-n关系的查询实体,spring-boot,jooq,spring-data-jdbc,Spring Boot,Jooq,Spring Data Jdbc,我试图在JOOQ(基于spring数据jdbc)的帮助下加载包含对另一个实体(1-n)的引用的实体 我已经开始延长时间了 具有1-n关系的调整模型: @Data public class Category { private @Id Long id; private String name, description; private AgeGroup ageGroup; private Set<SubCategory> subCategories;
@Data
public class Category {
private @Id Long id;
private String name, description;
private AgeGroup ageGroup;
private Set<SubCategory> subCategories;
public Category() {}
public Category(Long id, String name, String description, AgeGroup ageGroup) {
this(id, name, description, ageGroup, new HashSet<>());
}
public Category(Long id, String name, String description, AgeGroup ageGroup, Set<SubCategory> subCategories) {
this.id = id;
this.name = name;
this.description = description;
this.ageGroup = ageGroup;
this.subCategories = subCategories;
}
}
我写了两个查询,一个是通过crudepository
中的@Query
-注释,另一个是在JooqRepository
中的JOOQ
的帮助下
interface CategoryRepository extends CrudRepository<Category, Long>, JooqRepository {
@Query("SELECT * FROM category")
List<Category> findAllWithQuery();
}
如您在以下输出中所见,JOOQ
查询的子类别将不会加载:
2019-11-26 16:28:00.749 INFO 18882 --- [ main] example.springdata.jdbc.jooq.Output : ==== JOOQ ====
Category(id=1,
name=Cars,
description=Anything that has approximately 4 wheels,
ageGroup=_3to8,
subCategories=null)
2019-11-26 16:28:00.749 INFO 18882 --- [ main] example.springdata.jdbc.jooq.Output : ==== Query ====
Category(id=1,
name=Cars,
description=Anything that has approximately 4 wheels,
ageGroup=_3to8,
subCategories=[SubCategory(id=1,
title=sub0),
SubCategory(id=2,
title=sub1)])
这是shema使用的数据库:
CREATE TABLE IF NOT EXISTS category (
id INTEGER IDENTITY PRIMARY KEY,
name VARCHAR(100),
description VARCHAR(2000),
age_group VARCHAR(20)
);
CREATE TABLE IF NOT EXISTS sub_category (
id INTEGER IDENTITY PRIMARY KEY,
title VARCHAR(100),
category INTEGER
)
在JOOQ变体中,JOOQ执行从
ResultSet
到对象实例的转换。由于JOOQ不知道聚合的解释,因为它是由Spring数据JDBC完成的,因此它只对类别
本身进行分析,而不是子类别
中包含的集
interface CategoryRepository extends CrudRepository<Category, Long>, JooqRepository {
@Query("SELECT * FROM category")
List<Category> findAllWithQuery();
}
另一方面,Spring数据JDBC解释类别的结构,并在此基础上执行另一条语句来加载子类别
@Test
public void exerciseRepositoryForSimpleEntity() {
// create some categories
SubCategory sub0 = new SubCategory(null, "sub0");
SubCategory sub1 = new SubCategory(null, "sub1");
Category cars = new Category(null, "Cars", "Anything that has approximately 4 wheels", AgeGroup._3to8, Sets.newLinkedHashSet(sub0, sub1));
// save category
repository.saveAll(asList(cars));
// execute
List<Category> actual = repository.findAllWithJooq();
List<Category> compare = repository.findAllWithQuery();
Output.list(actual, "JOOQ");
Output.list(compare, "Query");
// verify
assertThat(actual).as("same size of categories").hasSize(compare.size());
assertThat(actual.get(0).getSubCategories()).as("same size of sub-categories").hasSize(compare.get(0).getSubCategories().size());
}
java.lang.AssertionError: [same size of sub-categories]
Expecting actual not to be null
2019-11-26 16:28:00.749 INFO 18882 --- [ main] example.springdata.jdbc.jooq.Output : ==== JOOQ ====
Category(id=1,
name=Cars,
description=Anything that has approximately 4 wheels,
ageGroup=_3to8,
subCategories=null)
2019-11-26 16:28:00.749 INFO 18882 --- [ main] example.springdata.jdbc.jooq.Output : ==== Query ====
Category(id=1,
name=Cars,
description=Anything that has approximately 4 wheels,
ageGroup=_3to8,
subCategories=[SubCategory(id=1,
title=sub0),
SubCategory(id=2,
title=sub1)])
CREATE TABLE IF NOT EXISTS category (
id INTEGER IDENTITY PRIMARY KEY,
name VARCHAR(100),
description VARCHAR(2000),
age_group VARCHAR(20)
);
CREATE TABLE IF NOT EXISTS sub_category (
id INTEGER IDENTITY PRIMARY KEY,
title VARCHAR(100),
category INTEGER
)