All Questions
2,038
questions
0
votes
1
answer
24
views
Entity Inheritance and query filtering
I'm trying to achieve a very basic from SQL point of view operation but using Spring Boot and JPA
This is my Java data model:
@MappedSuperclass
public abstract class BaseEntity {
@Id
@...
- 55
0
votes
0
answers
29
views
Why does Blaze-Persistence project count queries for pagination despite potential performance issues?
I'm using Blaze-Persistence and noticed that its offset pagination feature projects the count query as follows( concisely reduced ):
select *, (select count(*) from Entity)
from Entity e inner join ...
- 1
1
vote
0
answers
72
views
Join parent with children and children with grandchildren in a single query
I am learning Spring Data JPA. I want to implement this query in it:
select * from p
left join c on p.p_id = c.p_id
left join g on c.c_id = g.c_id;
I have three tables, p, c and g.
These are ...
- 352
-1
votes
0
answers
15
views
Parameterize jsonb specfic key with Spring Jpa
There is a list having once column jsonb type .
{
"quoteId":2024,
"quoteName":"EDE",
"quoteDetails" :[
"id":3156,
"metadata":[
"code&...
- 1
1
vote
1
answer
109
views
Spring Data JPA/Hibernate: JPQL constructor expressions- difference between using "new(..)" and not using it
I am using JPQL and projecting the specific returned fields into a different Class than the Entity. I can achieve it using at least the following 2 ways in JPQL with EntityManger (em in code):-
@Test
...
- 352
0
votes
1
answer
39
views
Anyone can translate this JPQL to mySQL
@Query("SELECT u FROM User u LEFT JOIN FETCH u.roles WHERE u.email = :email")
Optional<User> findByEmailWithRoles(@Param("email") String email);
I like to use mysql but this ...
-1
votes
1
answer
35
views
Why does one delete statement cascade, but not the other?
In my Spring Boot app, I have a table message which has a child table message_recipient i.e. the latter holds a foreign key to the former. These are both mapped to domain classes using JPA.
I've ...
- 187k
0
votes
0
answers
20
views
JPQL ignores Boolean param of joined entity field which is @Embedded
I have written JPQL query in repo to retrieve quiz with child questions which are not deleted. Deletion data is kept in @Embedded field Removal on entity. However the repository method keeps returning ...
- 17
0
votes
0
answers
18
views
JPA OneToMany JoinColumn returning unrelated children
my first real-life experience with JPA. So please forgive naiveness!
I have two 1-to-n related DB tables and I need a read-only access through JPA to them.
I have realized the JPQA query like below
...
- 93
0
votes
0
answers
69
views
Spring Boot 3.x.x, Left Join with condition stopped working correctly
I have custom query in jpa repository:
@Repository
public interface UserRepository extends JpaRepository<User, Long> {
@Query("""
select
user
...
0
votes
0
answers
33
views
JPA Query with NOT LIKE doesn't work to filter ips
I am working with a JPQL query to filter some gateways ips ending with 1 (the column in the database is of type INET but on the entity is of type String):
...AND concat(c.ip,'') not LIKE '%.1'
THe ...
- 1
0
votes
1
answer
66
views
What string can be used in JPQL order by to cause SQL injection?
Consider code similar to this:
String orderBy = getParameter("orderBy");
String orderDir = getOrderDir(); // returns "asc" or "desc"
String query = "select u from ...
- 9
0
votes
0
answers
17
views
How to query the inverse relationship of a ManyToMany in JPQL?
I have 3 entities that have the following relationships (all ManyToMany):
EquipmentMaster <=> ComponentMaster <=> CanMaster
EquipmentMaster <=> CanMaster
Classes (getters & ...
0
votes
1
answer
23
views
Use JPQL or SQL to SELECT items _not_ in the database from a supplied set in the query parameters
I have an interesting problem, I need to figure out which files I have not processed.
I have an object called ReturnFile(return_files) that stores the ones I've processed. I'd like to issue a query ...
- 8,395
0
votes
1
answer
55
views
How to join tables efficiently?
In Java, with JPA and EclipseLink. Lets say I have 3 tables: Supplier, Order and Customer
I want to get all customers that have an order by said supplier. Say suppliers and customers are not directly ...
