♪ SQL different types of clusters of tablesJOINTwo of them are interesting.INNER JOIN: In the absence of a recording in the attached table, the entry from the main table does not appear in the resulting sampleLEFT JOIN: The entry from the main table shall be entered in the resulting sample irrespective of the presence of the entry in the attached tableIn language JPQL operator JOIN The default works as INNER JOINso, in your case, the samples are missing records for which no records have been found. secondInstance and thirdInstance♪ For the sample to be essentially Case There were empty records. secondInstance and thirdInstance should be clearly indicated. LEFT JOIN♪

Such tasks were addressed through the interface. Specification:public class ResolutionSpecs { public static Specification<Resolution> isActualUser(String user) { return new Specification<Resolution>() { public Predicate toPredicate(Root<Resolution> r, CriteriaQuery<?> cq, CriteriaBuilder cb) { return cb.equal(r.get(_Resolution.user), user); } }; } public static Specification<Resolution> isSomeDateAfter(Date start) { return new Specification<Resolution>() { public Predicate toPredicate(Root<Resolution> r, CriteriaQuery<?> cq, CriteriaBuilder cb) { return cb.greater(r.get(_Resolution.someDate), start); } }; } public static Specification<Resolution> isSomeDateBefore(Date end) { return new Specification<Resolution>() { public Predicate toPredicate(Root<Resolution> r, CriteriaQuery<?> cq, CriteriaBuilder cb) { return cb.lower(r.get(_Resolution.someDate), end); } }; } } @Repository public interface ResolutionRepository extends JpaRepository<Resolution, Long>, JpaSpecificationExecutor<Resolution> { } @Service public class ResolutionService { private final ResolutionRepository repository; @Autowired public ResolutionService(ResolutionRepository repository) { this.repository = repository; } public List&lt;Resolution&gt; findByUserAndSomeDateBetween(String user, Date start, Date end) { Specification&lt;Resolution&gt; sp = null; if (user != null) { sp = Specifications.where(ResolutionSpecs.isActualUser(user)); } if (start != null) { sp = (sp == null ? Specifications.where(ResolutionSpecs.isSomeDateAfter(start)) : sp.and(ResolutionSpecs.isSomeDateAfter(start))); } if (end != null) { sp = (sp == null ? Specifications.where(ResolutionSpecs.isSomeDateBefore(end)) : sp.and(ResolutionSpecs.isSomeDateBefore(end))); } return repository.findAll(sp); } } http://docs.spring.io/spring-data/jpa/docs/current/reference/html/#specifications ♪There may also be a way to use a library to generate SQL queries, such as JOOQ, but I have no experience with it. http://www.jooq.org/doc/3.4/manual-single-page/#select-statement ♪ http://www.baeldung.com/jooq-with-spring ♪

Table field type, first case varchar(1000)in the second text♪ Type text not limited in length. The hygabytes of the text can be retained in the fields of this type.

You can point the poles in the pots. @Query (value = "Select b FROM Books WHERE \"Books.BOOK_TITLE\" LIKE ? AND \"Books.autor\" LIKE ?", nativeQuery = true) Remove the IDE test Settings -> Incpections -> Jpa issues "Unresolved queries and query parameter" снять галочку

Add the class. User The fields you need, and on the website, put them in. https://github.com/hellokoding/registration-login-spring-xml-maven-jsp-mysql/blob/master/src/main/webapp/WEB-INF/views/registration.jsp#L57 I'd like to know what's happening.

It's been conceived and written for a long time. There's a crowd. http://docs.jboss.org/tools/3.0.1.GA/en/hibernatetools/html_single/index.html (Eclipse flame) which allows, among other things, to generate Hibernate for the existing scheme.

It's decided to send it to Clint Side pojo in json.@RequestMapping(method = RequestMethod.GET, path = "/first") public @ResponseBody CpLicenseInfo getLicenseKeyFirst(@AuthenticationPrincipal UserDetailsDecorator currentUser) { return service.getLicenseKeyFirst(currentUser.getEntity()); } if (document.getElementById("license_key_first")) { $.ajax({ type: "GET", url: "/api/cp/first", dataType: 'json', contentType: 'application/json', mimeType: 'application/json', success: function (data) { var result = data.key_first; $("#key_first").text(result); } }); }

Create the class. public class DepartmentDto { @JsonProperty("DepId") private Integer depId; @JsonProperty("PoName") private String poName; @JsonProperty("PoType") private String poType; @JsonProperty("Mestnost1") private String mestnost1; @JsonProperty("Mestnost2") private String mestnost2; @JsonProperty("PoStatus") private Integer poStatus; @JsonProperty("PostIndex") private String postIndex; // геттеры, сеттеры } Get through the restTemplate collection of copies of this class and do whatever you want (e.g. transfer to JPA Entity class and write to base).

You use a reserved word. check (but it does not allow for the construction of a table with such a column) for the Check class:@Entity @Table(name = "Orders") public class Ord { @Id @GeneratedValue(strategy = GenerationType.AUTO) private long id; @JoinColumn(name = "check_id") //вот тут замена @OneToOne(fetch = FetchType.EAGER,cascade = CascadeType.ALL) private Check check; //Другие поля } The reserved word should be changed to another, for example check_id♪

In my first request, "SELECT * from CustomCourse" was a SQL request, and it was thing to do "SELECT c FROM CustomCourse c" once JPA and Hibernate.Second MrFylypenko correctly indicated that the List findAllCourses() method had to be made; It allows us to walk around without cycles, and it makes my job easier.The JpaRepository method is working, too.My code looks like it. @Query("SELECT c FROM CustomCourse c") ArrayList<CustomCourse> findAll();

How the removal affects the substance in every possible state describes section 3.2.3 of the baits http://download.oracle.com/otndocs/jcp/persistence-2_1-fr-eval-spec/index.html If the status is new, the operation is ignored, but dependent Entity may change the status to removed if they have cascade annotations and have managed status, If managed, the status is changed to remove, and the recording of the facility in the database will be removed when they commit the transaction. (The operation will also be removed for all cascade dependent objects),If the status is removed, the operation is ignored,If detached, the exception will be dropped immediately or at the stage.

The parameters of the request can be read to the specifications and transmitted to the requests.Example of specification request:CuVotercntByCuSpecification builder = new CuVotercntByCuSpecification(); Specification<CuVotercntByCu> specification = where(builder.isEqualViborrefererDate()) .and(builder.fetch("ciuSubject")) .and(builder.fetch("viboryrefer")) .and(builder.fetch("protocolStatus")); List<CuVotercntByCu> allCiu = votercntByCuRepository.findAll(specification, Sort.by("viboryrefer.namvibor", "numokr")); Example of specification:public class CuVotercntByCuSpecification extends BaseSpecification<CuVotercntByCu> { }

First option:Entity entity= em.getReference(Entity.class, id); //em.find(Entity.class, id); em.getTransaction().begin(); entity.setName("Joe"); entity.setAddress("Address"); em.getTransaction().commit(); Second option (in fact, without connection, all fields will be updated)void updateEntity (Entity entity){ em.getTransaction().begin(); em.merge(entity); em.getTransaction().commit(); } Third optionem.getTransaction().begin(); em.createQuery("UPDATE Entity SET name =:name, address=: address where id = :id") .setParameter("name", name) .setParameter("address", address) .setParameter("id", id) .executeUpdate(); em.getTransaction().commit(); The preference for the first option, i.e. all field management to update the substance goes through Java code, the second option is not very secure (may be missed by added or modified fields of the developer, especially heavy fields such as BLOB or String length = 100,00000), and the third option is to write the code.

The problem hashcode(s); After he was removed, there was a log in the tectreus with "un-managed delete" - It's all about this problem.

For the correct work of cascade = CascadeType.PERSIST with HibernateTemplate, the method persist(s) should be used instead of save()

@ManyToOne private Judge judge;// в классе Case @ManyToOne private Client client;// в классе Case @OneToMany (mappedBy = "judge") private Set<Case> cases = new HashSet<>();// в классе Judge @OneToMany (mappedBy = "client") private Set<Case> cases = new HashSet<>();// в классе Client public List<Case> findAll() { Query query = entityManager.createQuery("select c from Case c left join fetch c.lawyer left join fetch c.judge left join fetch c.client", Case.class); return query.getResultList(); } necessarily redesign hashCode and equals at all classes

The error was in the class of substance declaring the table.@javax.persistence.Table(name = "TL_Tasks", schema = "dbo", catalog = "todoListDB") @Entity public class TlTasks { private int id; @javax.persistence.Column(name = "id", nullable = false, insertable = false, updatable = false, length = 10, precision = 0) @Id public int getId() { return id; } In pole proclamation insertable = false, updatable = false standing. true♪ There was a mistake at this stage.

You answered your question yourself. JPA is a specification, and Hibernate is ORM Framworth/Library compatible with JPA. As in the classical PLO, the class that operates the interface may have additional methods/practice, and Hiberante has more than JPA. According to some data, JPA &apos; s own specifications were based on the ideas embodied in Hibernate, however, EclipseLink is an official implementation. When it's convenient to change the implementation and what's that for?Changes may be necessary, for example, in the following cases:Significant deficiencies (bags) in the implementation or version of the implementationChanges in the licensing of your product (Hibernate has more restrictions than EclipseLink).Switch to another application server. Most EE servers have built-in implementation of JPA. It often makes sense to use what is being delivered to the application server to avoid compatibility problems. Specific requirements for ORM

♪ http://docs.oracle.com/javaee/6/api/javax/persistence/Column.html#updatable%28%29 ♪ updatable=false Only influences the generation of UPDATE requests. In line (1), we create a new essence and we must generate SQL INSERT Request. In line (2), we call method employeeJpaRepository.saveAndFlushwhich, http://docs.spring.io/autorepo/docs/spring-data-jpa/1.7.x/api/org/springframework/data/jpa/repository/JpaRepository.html#saveAndFlush-S- (sighs) https://github.com/spring-projects/spring-data-jpa/blob/master/src/main/java/org/springframework/data/jpa/repository/support/SimpleJpaRepository.java should cause save(entity) and flush()♪@Transactional public <S extends T> S saveAndFlush(S entity) { S result = save(entity); flush(); return result; } In turn, method save(entity) has such a view:@Transactional public <S extends T> S save(S entity) { if (entityInformation.isNew(entity)) { em.persist(entity); return entity; } else { return em.merge(entity); } } Since we already have an object, the method will be called. em.merge(entity);Let's go to the merge method description. Turning to http://download.oracle.com/otndocs/jcp/ejb-3_0-fr-oth-JSpec/ (sighs) http://download.oracle.com/otn-pub/jcp/ejb-3_0-fr-oth-JSpec/ejb-3_0-fr-spec-persistence.pdf?AuthParam=1501531629_a1278b338ffa49dd2766f4e4ccd669a6 On pdf, but it is possible to open a licensing agreement. Let's go to the section: 3.2.4.1. Merging Detached Entity State The semantics of the merge operation applied to an entity X are as follows:♪ ♪ ♪♪ ♪ ♪If X is a managed entity, it is ignored by the merge operation, however, the merge operation is cascaded to entities referenced by relationships from X if these relationships have been anno- tated with the cascade element value cascade=MERGE or cascade=ALL annotation.A simpler version from the Internet:if the entity is already in the persistence context (session), no action is taken, except for cascadesFree translation: If X is managed, it will be ignored in merge surgery, but it will be applied to cascade-related objects. ♪ ♪But why do we still have SELECT in line (2)? And there's a request for "the most recent" version of our essence, to be followed by the mechanism. https://letslearnjava.quora.com/Dirty-Checking-in-Hibernate We've found changes and managed to generate UPDATE query. By summarizing the above and answering questions:Both results of SELECT requests are the same, but only merge returns the existing object from a session that has already changed the meaning name♪ The approach may be proposed to modify the method in such a way @Transactional public EmployeeJpaBean create(final EmployeeJpaBean employeeJpaBean) { employeeJpaRepository.saveAndFlush(employeeJpaBean); return employeeService.read(employeeJpaBean.getId()); } But I'll think about the second question. ♪ ♪

Yes, I can help. CriteriaBuilder.function:filterApps = builder.equal( builder.function("TO_CHAR", Date.class,root.get("youDateColumn"), builder.literal("yyyy")), youYear); predicateList.add(filterApps);