jpql | 易学教程

Ordering a join fetched collection in JPA using JPQL/HQL

阅读更多关于 Ordering a join fetched collection in JPA using JPQL/HQL

问题 Given the below JPQL statement, how do I modify it so that the kittens in the resulting list are ordered by their age property? SELECT c FROM Cat c left join fetch c.kittens WHERE c.id = :id I've tried multiple approches but without any luck. This is esentially what I would like to do, but it doesn't work: SELECT c FROM Cat c left join fetch c.kittens k WHERE c.id = :id ORDER BY k.age 回答1: Hej, I don't think this is possible when applied using queries. But as far as I remember, you can use

Name for parameter binding must not be null or empty! For named parameters you need to use @Param for query method parameters on Java versions

阅读更多关于 Name for parameter binding must not be null or empty! For named parameters you need to use @Param for query method parameters on Java versions

问题 This has been posted before but my issue is a little different. This is the JPQL query in question: @Query("SELECT NEW com.htd.domain.ShopOrder(po.id, po.po_number, " + "po.due_date, po_part.id, po_part.part_quantity, " + "part.id, part.part_number, part.part_description, " + "part.plasma_hrs_per_part, part.grind_hrs_per_part, " + "part.mill_hrs_per_part, part.brakepress_hrs_per_part) " + "FROM Po po " + "LEFT JOIN po.partList po_part " + "LEFT JOIN po_part.part part " + "LEFT JOIN po_part

Kundera Cassandra JPQL with Compound Key

阅读更多关于 Kundera Cassandra JPQL with Compound Key

Am using Kundera JPA for Cassandra. Kundera version is: 3.8 Here are my Entity definitions:- @Embeddable public class PartitionKey implements Serializable { @Column(name = "ID") private String Id; @Column (name = "TYPE") private String Type; } @Embeddable public class CompoundKey implements Serializable { @Embedded private PartitionKey partitionKey; @Column(name = "LABEL") private String label; } @Embeddable public class Comment { @Column(name="comment") private String comment; } @Entity @Table(name = "MY_ENTITY", schema = "xyz@cassandra_pu") public class MyEntity { @EmbeddedId private

Return more data than model contains using Spring Data

阅读更多关于 Return more data than model contains using Spring Data

I'm working with Spring Data which is great stuff, but sometimes I need to get more data from database than my model can handle. For example I have model like below. @Entity @Table(name = "email") public class Mail implements Serializable { @Getter @Setter @GeneratedValue(strategy = GenerationType.IDENTITY) @Id private Long id; @Getter @Setter private String text; } An I my query will be more complex than usual. I want to get my model and in addition number of similar entities, using group by . @Query(value = "SELECT m, COUNT(m) as countValue FROM Mail m GROUP BY m.text") List<Mail>

JPA 3-way join annotation

阅读更多关于 JPA 3-way join annotation

问题 There are three tables modeled as three entities: @Entity @Table(name="event") public class Event { public Long datetime; public String name; public Long processId; } @Entity @Table(name="process") public class Process { public Long Id; public Long sequence; public Name name; } @Entity @Table(name="operation") public class Operation { public Long Id; public Long datetime; public Long sequence; } Any unique single record of process-operation-sequence is obtained by the SQL that has a 3-way

How can I use JPQL in a NamedQuery to create an entity having a calculated transient attribute?

阅读更多关于 How can I use JPQL in a NamedQuery to create an entity having a calculated transient attribute?

问题 I have an SQL statement: SELECT x.SPEED, (6371 * acos(cos(radians(16.65555))) * cos(radians(LATITUDE)) * cos(radians(LONGITUDE) - radians(54.55555)) + sin(radians(16.65555)) * sin(radians(LATITUDE))) AS dist FROM MY_TABLE x HAVING dist <= 50 ORDER BY dist How can I put this into a NamedQuery within a Java entity class in a way that the calculated value is set into this entity as a transient attribute called distance ? For the time being I have tried this: SELECT vsle, (:distance_unit * FUNC(

Loading Two Unrelated Entities (nothing in comman) in One Query [Spring Data JPA]

阅读更多关于 Loading Two Unrelated Entities (nothing in comman) in One Query [Spring Data JPA]

问题 How can two unrelated entities , nothing in common be loaded in one Query using spring data jpa? Current Code : User user = userRepo.findOne(userId); Post post = postRepo.findOne(postId); This creates two sql query is there any way to do it 1 Query. Is there any way doing like this Object[] userAndPost = someRepo.findUserAndPost(userId, postId); Please note both user and post are unrelated and have no common column on which join can be done. Sandeep 回答1: You could refer to this answer and

How to correctly convert JPQL query using “%”

阅读更多关于 How to correctly convert JPQL query using “%”

问题 I have this query (works fine): @Override public List<Product> getProductsByName(String name) { Query q = em.createQuery("SELECT p FROM Product p WHERE p.productName LIKE '%"+name+"%'"); @SuppressWarnings("unchecked") List<Product> pro = q.getResultList(); return pro; } but I want to convert it into this (with .setParameter()): @Override public List<Product> getProductsByName(String name) { Query q = em.createQuery("SELECT p FROM Product p WHERE p.productName LIKE %:name %") .setParameter(

Define sort property for referenced field during order by in JPQL

阅读更多关于 Define sort property for referenced field during order by in JPQL

问题 I have rest repository with 2 entities and projection: @Entity public class Person { @Id @GeneratedValue private Long id; String name; @ManyToOne Language language; } @Entity public class Language { @Id @GeneratedValue private Long id; private String name; } public interface PersonRepository extends PagingAndSortingRepository<Person, Long> { } @Projection(name = "details", types = {Person.class}) interface PersonProjection { Long getId(); String getName(); @Value("#{target.language.name}")

How to use Regex keyword in Spring Data Repository Method

阅读更多关于 How to use Regex keyword in Spring Data Repository Method

问题 I am currently using spring-data-jpa version 1.9.4 . I have a MySql table with columns project(integer), summary(varchar), and description(varchar). I have a regex that I would like to use to search the summary and/or description field meaning that if it finds it in summary does not need to apply regex to description. The repository method I am attempting to use is: List<Issue> findByProjectAndSummaryOrDescriptionRegex(long project, String regex) The error I am receiving is: java.lang