[英]spring-data-jdbc: query containing entity with a 1-n relation
How can I write Queries for entities containing a 1-n reference?如何为包含 1-n 引用的实体编写查询?
Based on the spring-data-jdbc examples I will explain it with the following unit-test:基于spring-data-jdbc示例,我将使用以下单元测试对其进行解释:
@Test
public void customQuery_ReferenceMultipleInstances() {
// prepare
LegoSet smallCar = createLegoSet("Small Car 01", 5, 12);
smallCar.setManual(new Manual("Just put all the pieces together in the right order", "Jens Schauder"));
smallCar.addModel("suv", "SUV with sliding doors.");
smallCar.addModel("roadster", "Slick red roadster.");
repository.save(smallCar);
// execute
List<LegoSet> actual = repository.findByName("Small Car 01");
Iterable<LegoSet> compare = repository.findAll();
// verify
assertThat(actual).as("same number of lego sets").hasSize(Lists.newArrayList(compare).size());
assertThat(actual.get(0).getModels()).as("same number of models").hasSize(Lists.newArrayList(compare).get(0).getModels().size());
assertThat(actual.get(0).getModels().get(0)).as("model must not be null").isNotNull();
assertThat(actual.get(0).getModels().get(0).getName()).as("model must have a name").isNotEmpty();
}
This models a LegoSet
referencing 2 Model
s.这模拟了一个引用 2 个Model
的LegoSet
。 The repository.findByName()
is annotated with a custom query; repository.findByName()
用自定义查询注释; the repository.findAll()
is the standard spring-boot-data method of the CrudRepository
(just as reference). repository.findAll()
是CrudRepository
的标准 spring-boot-data 方法(仅供参考)。
The custom query in version 1:版本 1 中的自定义查询:
@Query("SELECT ls.id, ls.name, ls.min_age, ls.max_age, " +
"h.handbuch_id AS manual_handbuch_id, h.author AS manual_author, h.text AS manual_text " +
"FROM lego_set ls JOIN handbuch h ON ls.id = h.handbuch_id " +
"WHERE name = :name")
List<LegoSet> findByName(@Param("name") String name);
In this version the test fails w/在此版本中,测试失败 w/
java.lang.AssertionError: [model must not be null]
Expecting actual not to be null
Okay, after that I add another JOIN
to model
:好的,之后我将另一个JOIN
添加到model
中:
@Query("SELECT ls.id, ls.name, ls.min_age, ls.max_age, " +
"h.handbuch_id AS manual_handbuch_id, h.author AS manual_author, h.text AS manual_text, " +
"m.* " +
"FROM lego_set ls JOIN handbuch h ON ls.id = h.handbuch_id " +
"JOIN model m ON ls.id = m.lego_set " +
"WHERE name = :name")
List<LegoSet> findByName(@Param("name") String name);
Now the test fails w/现在测试失败了/
java.lang.AssertionError: [same number of lego sets]
Expected size:<1> but was:<2> in:
<[LegoSet(id=1, name=Small Car 01, minimumAge=P5Y, maximumAge=P12Y, manual=Manual(id=1, author=Jens Schauder , text=Just put all the pieces together in the right order), models={suv=Model(name=suv, description=SUV with sliding doors.), roadster=Model(name=roadster, description=Slick red roadster.)}),
LegoSet(id=1, name=Small Car 01, minimumAge=P5Y, maximumAge=P12Y, manual=Manual(id=1, author=Jens Schauder
So how do I have to write that query correctly?那么我该如何正确编写该查询呢?
The first query is actually the correct one and it is working fine.第一个查询实际上是正确的,并且工作正常。
The problem is in your test.问题出在你的测试中。 models
is a Map
, but you treat it like a List
which compiles because a list index is also a valid map key. models
是一个Map
,但是你把它当作一个List
来编译,因为列表索引也是一个有效的映射键。
If you change the last two assertions in your test like this they will succeed:如果您像这样更改测试中的最后两个断言,它们将会成功:
assertThat(actual.get(0).getModels().get("suv")).as("model must not be null").isNotNull();
assertThat(actual.get(0).getModels().get("suv").getName()).as("model must have a name").isNotEmpty();
// ----------------------------------------^
An alternative is to use the second query but with a custom ResultSetExtractor
to collect multiple rows for the multiple models into a single LegoSet
.另一种方法是使用第二个查询,但使用自定义ResultSetExtractor
将多个模型的多行收集到单个LegoSet
中。
I'm in a similar situation, but i don't see what is different in my situation.我处于类似情况,但我看不出我的情况有什么不同。
I have three models: Client: id, name.. Project: id, name, clientId, List ProjectMember我有三个模型: Client: id, name.. Project: id, name, clientId, List ProjectMember
Here is my had coded query这是我的编码查询
@Query("""
select
project.id,
project.legacy_id,
project.code,
project.client_id,
project.is_archived,
project.name,
project.budget_type,
project.hours_budget_max,
project.money_budget_max
from project
join client on client.id = project.client_id
where client.name ilike '%:name%'
""")
List<Project> findByClientNameContainingIgnoreCase(final String name);
As you can see i'm looking for project where client name (using a join) match a pattern.如您所见,我正在寻找客户名称(使用连接)匹配模式的项目。
Executing the request by hand give me the expected results.手动执行请求会给我预期的结果。 But going through spring data jdbc give me no results但是通过 spring data jdbc 没有给我任何结果
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