Following this example I am trying to create custom queries, using the reactive mongo template.
I have defined the following files
Repository definition
#Repository
public interface SimulationRepository extends ReactiveMongoRepository<Simulation, String>, PersSimRepo {
#Query("{userId : ?0}")
public Flux<Simulation> findByUserId(String userId);
#Query("{userId : ?0}")
public Flux<Simulation> findByUserId(String userId, Pageable pageable);
public Mono<Long> countByUserId(String userId);
}
Custom query interface
public interface PersSimRepo {
Flux<Simulation> aaa(String userId, Sort sort, List<GlobalSimStatus> status);
}
Custom query implementation
#Slf4j
public class PerSimRepoImpl implements PersSimRepo {
private final ReactiveMongoTemplate mongoTemplate;
public PerSimRepoImpl(ReactiveMongoTemplate mongoTemplate) {
this.mongoTemplate = mongoTemplate;
}
#Override
public Flux<Simulation> aaa(String userId, Sort sort, List<GlobalSimStatus> status) {
log.info("status:{}", status);
Query query = new Query();
query.addCriteria(Criteria.where("userId").is(userId).and("status").in(status));
return mongoTemplate.find(query.with(sort), Simulation.class);
}
}
When I try to start the project I get this exception
Could not create query for public abstract reactor.core.publisher.Flux it.reply.evtb.repository.specialization.PersSimRepo.aaa(java.lang.String,org.springframework.data.domain.Sort,java.util.List); Reason: No property 'aaa' found for type 'Simulation'; nested exception is org.springframework.data.mapping.PropertyReferenceException: No property 'aaa' found for type 'Simulation'
Where Simulation is the object, apparently spring looks for a "aaa" field inside Simulation
This looks like a bug to me, I can't figure out where I am wrong, I use spring boot 2.7.5
Related
I want to have similar functionality as I get with the JPA #PrePersist but in a mongodb database. Reading the spring data mongodb documentation I found the entity callbacks: https://docs.spring.io/spring-data/mongodb/docs/current/reference/html/#entity-callbacks. They seem to work for what I need so I'm trying to implement some callbacks. I know there are some alternatives for what I'm doing (auditing annotations) but I want to keep with this for the moment.
This is how I register the callback, my entity definition and the repository:
#Configuration
public class BeforeSaveCallbackConfiguration {
#Bean
BeforeSaveCallback<Measurement> beforeSaveMeasurement() {
return (entity, document, collection) -> {
entity.setTimestamp(System.currentTimeMillis());
System.out.println("Before save, timestamp: " + entity.getTimestamp());
return entity;
};
}
}
public interface MeasurementRepository extends MongoRepository<Measurement, String> {
}
#Document
public class Measurement {
private String id;
private long timestamp;
private Float value1;
private Float value2;
// constructor, getters, setters ...
}
I save the entity using measurementRepository.save method of the repository. I actually see the printed line from the callback with the timestamp. However the data saved in the mongodb collection always have timestamp set to 0. Does anyone have any hint?
You implement BeforeConvertCallback interface can work for you：
#Component
public class TestCallBackImpl implements BeforeConvertCallback<Measurement> {
#Override
public Measurement onBeforeConvert(Measurement entity, String collection) {
entity.setTimestamp(System.currentTimeMillis());
return entity;
}
}
I'm trying to create a repository that has a method which doesn't fit the usual JpaRepository with #Query annotations.
I've created a custom repository interface:
public interface CustomVoteRepository {
List<VoteCountResult> countVotesForSession();
}
And the implementation:
#Repository
public class CustomVoteRepositoryImp implements CustomVoteRepository {
private JdbcTemplate jdbcTemplate;
public CustomVoteRepositoryImp(JdbcTemplate jdbcTemplate) {
this.jdbcTemplate = jdbcTemplate;
}
#Override
public List<VoteCountResult> countVotesForSession() {
return jdbcTemplate.query("SELECT video_id, COUNT(votes.id) FROM votes WHERE session_id=2 GROUP BY video_id",
new CustomRowMapper());
}
}
However, this gives me this error:
No property countVotesForSession found for type Vote!
I don't understand why it's trying to map a property on the Vote class. I understand it does this for the "auto-generated" method names, but this is supposed to be a custom one.
I've come across this article: https://www.mkyong.com/spring-data/spring-data-add-custom-method-to-repository/ which explains what I'm doing, and yet it's trying to map a property of the model for a custom repository.
I'm sure I missed something stupid.
Thanks!
Edit:
Here's the VoteCountResult dto:
#Data
#AllArgsConstructor
public class VoteCountResult {
private String count;
private String title;
private String url;
}
What if you change your custom method name to votesForSessionCount ? I think this way you won't face with method name conflict.
I have Tenant table where only one tenant should be active at a time.
To activate a tenant i am using following code. Is there a better way to change particular column of all rows using spring data mongo.
tenantRepository.save(tenantRepository.findAll().stream().map(t -> {
t.setActive(false);
return t;
}).collect(Collectors.toList()));
tenant.setActive(true);
tenantRepository.save(tenant);
If you want to update specific column(s) in Spring data Mongo, simply define your custom repository interface and its implementation like:
Define Custom Interface
public interface TenantRepositoryCustom {
Integer updateStatus(List<String> id, TenantStatus status, Date date);
}
Implement your Custom Interface
#Repository
public class TenantRepositoryCustomImpl implements TenantRepositoryCustom{
#Autowired
MongoTemplate template;
#Override
Integer updateStatus(List<String> id, TenantStatus status, Date date) {
WriteResult result = template.updateMulti(new Query(Criteria.where("id").in(ids)),
new Update().set("status", status).set("sentTime", date), Tenant.class);
return result.getN();
}
Extends you Default Tenant Repository from Custom Repository:
public interface TenantRepository extends MongoRepository<Tenant, String>, TenantRepositoryCustom{
}
Use Custom repository in Service
#Service
public class TenantService{
#Autowired
TenantRepository repo;
public void updateList(){
//repo.updateStatus(...)
}
}
Note:
This is less error prone as compared to using #Query, as here you will have to just specify column's names and values instead of complete query.
I have just started using spring data MongoDb with Spring-Boot.
I have some mongo based json queries added in the interface using #query annotation when using spring data repository.
I want to know if it is possible to externalize or separate out the JSON query outside the codebase so that it can be optimized separately and
also not having it mixed with code.
Thanks for your suggestions.
This is the code which i have added in my interface and annotated with #query annotation.
#Query("{ 'firstname' : ?0 ,'lastname': ?1}")
List findByCriteria(String firstname,String lastname);
The above is a simple example. I have complex conditions involving $and and $or operators too .
What i basically want to achieve is externalize the above native mongo json query to a config file and refer that in the above annotation.
Spring data supports something similar when using jpa with hibernate. But not sure if we can do the same using spring data mongodb with spring boot.
Do like this (I am explaining only for the API)
Suppose you have an Entity user
At the Top there will be User domain
public class User extends CoreDomain {
private static final long serialVersionUID = -4292195532570879677L;
#Length(min = 2)
private String name;
#Length(min = 2)
#UniqueUserName(message = "User name already registered,Please choose something Different")
private String userName;
#Length(min = 6)
private String password;
}
User Controller
User Service (Interface)
User ServiceImpl(Service Implementation)
Mongo Repository(Since, I have MongoDb)
Now in userController you will take all the queries , Param(Parameters) , Pagerequest like this
public class UserController extends CoreController {
#Autowired
private UserService userService;
/*
* This controller is for getting the UserDetails on passing the UserId in
* the #param Annotation
*/
#GET
#Path("{id}")
public User getUser(#PathParam("id") String UserId) {
User user = new User();
user = userService.findUserId(UserId);
if (user == null)
throw new NotFoundException();
log.info("The userId you searched is having the details as :" + user);
return user;
}}
For serviceInterface you will have :
public interface UserService {
// Boolean authenticateUser(User user);
User findUserId(String UserId);
}
For serviceImpl :
public class UserServiceImpl implements UserService {
#Setter
#Autowired
private UserRepository userRepository;
/*
* This method will find user on the basis of their userIds passed in the
* parameter.
*/
#Override
public User findUserId(String UserId) {
User userIdResult = userRepository.findOne(UserId);
log.info("The userDetail is" + userIdResult);
return userIdResult;
}
In mongoRepository for user we will have:
A default query findById(String userId);
Hopefully this will help you.
What is the best way how to integrate Java 8 Date Time api in jpa?
I have added converters:
#Converter(autoApply = true)
public class LocalDatePersistenceConverter implements AttributeConverter<LocalDate, Date> {
#Override
public Date convertToDatabaseColumn(LocalDate localDate) {
return Date.valueOf(localDate);
}
#Override
public LocalDate convertToEntityAttribute(Date date) {
return date.toLocalDate();
}
}
and
#Converter(autoApply = true)
public class LocalDateTimePersistenceConverter implements AttributeConverter<LocalDateTime, Timestamp> {
#Override
public Timestamp convertToDatabaseColumn(LocalDateTime entityValue) {
return Timestamp.valueOf(entityValue);
}
#Override
public LocalDateTime convertToEntityAttribute(Timestamp databaseValue) {
return databaseValue.toLocalDateTime();
}
}
Everything seems fine, but how should I use JPQL for querying? I am using Spring JPARepository, and goal is to select all entities where date is the same as date given, only difference is that it is saved in entity as LocalDateTime.
So:
public class Entity {
private LocalDateTime dateTime;
...
}
And:
#Query("select case when (count(e) > 0) then true else false end from Entity e where e.dateTime = :date")
public boolean check(#Param("date") LocalDate date);
When executing it just gives me exception, which is correct.
Caused by: java.lang.IllegalArgumentException: Parameter value [2014-01-01] did not match expected type [java.time.LocalDateTime (n/a)]
I have tried many ways, but it seems that none is working, is that even possible?
Hibernate has an extension library, hibernate-java8 I believe, which natively supports many of the time types.
You should use it before writing converters.
in hibernate 5.2 you won't need this additional library, it is part of core.
To query temporal fields you should use the #Temporal Anotation in the temporal fields, add the converters to persistence.xml and also be sure you are using the java.sql.Date,java.sql.Time or java.sql.Timestamp in the converters. (Sometimes i imported from the wrong package)
for example thats works for me:
#Temporal(TemporalType.TIMESTAMP)
#Convert(converter = InstantPersistenceConverter.class)
private Instant StartInstant;
#Temporal(TemporalType.TIME)
#Convert(converter = LocalTimePersistenceConverter.class)
private LocalTime StartTime;
and my Instant converter:
#Converter(autoApply = true)
public class InstantPersistenceConverter implements AttributeConverter <Instant,java.sql.Timestamp>{
#Override
public java.sql.Timestamp convertToDatabaseColumn(Instant entityValue) {
return java.sql.Timestamp.from(entityValue);
}
#Override
public Instant convertToEntityAttribute(java.sql.Timestamp databaseValue) {
return databaseValue.toInstant();
}
}
Did you add LocalDatePersistenceConverter and LocalDateTimePersistenceConverter in persistence.xml placed in 'class' element ?