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jpa order records descending and select first record

I have a spring boot app connected to oracle DB.
I am trying to order a list of records and select the top most record.
I wrote a JPA query as below but it fails.
#Query("SELECT id FROM UploadedFile uploadedFile "
+ "WHERE uploadedFile.p_file_type = 'branch' "
+ "and p_file_status='Processed' "
+ "and p_is_file_process_with_error = 0 "
+ "order by c_created_date desc "
+ "FETCH FIRST 1 rows only ")
public String findLatestBranchCodeFile();
The error received was
creating bean with name 'uploadedFileRepo': Invocation of init method
failed; nested exception is java.lang.IllegalArgumentException:
Validation failed for query for method public abstract
java.lang.String
com.rhb.pintas.repo.UploadedFileRepo.findLatestBranchCodeFile()!
org.hibernate.hql.internal.ast.QuerySyntaxException: unexpected token:
FETCH near line 1, column 204 [SELECT id FROM
com.rhb.pintas.entities.UploadedFile uploadedFile WHERE
uploadedFile.p_file_type = 'branch' and p_file_status='Processed' and
p_is_file_process_with_error = 0 order by c_created_date desc FETCH
FIRST 1 rows only ] -> [Help 1]
The issue seems to be with fetch,not sure whats wrong.

It seems you are mixing HQL and native query dialects:
If this will be a naviveQuery (like most of the columns would mention), then replace the entity name with table name and add nativeQuery option. And because You are using only a single table, You can skip the alias name:
#Query("SELECT id FROM uploaded_file "
+ "WHERE p_file_type = 'branch' and p_file_status='Processed' and "
+ "p_is_file_process_with_error = 0 "
+ "order by c_created_date desc "
+ "FETCH FIRST 1 rows only ", nativeQuery = true)
public String findLatestBranchCodeFile();
If You want to keep it as a HQL, then replace all column names with entity property names, like p_file_type > fileType (I guess column names). Secondly You will need to pass a Pageable parameter, to replace Your 'Fetch first' statement.
You can find more materials here:
Bealdung
NativeQ
StackOverflow

You are trying to execute SQL query, in this case you need to add nativeQuery=true attribute to #Query annotation
UPD.
got confused because FETCH FIRST - is a SQL syntax, for JPA way please check another solution - it is possible to return list with at most one element.

I guess, you can try passing pagable to limit result set size and unlimit your query:
public String findLatestBranchCodeFile(Pageable pageable); // pass new PageRequest(0,1)

Use postgres function timestamp in JpaRepository

I try to group by date only, column active_to is timestamp so it has time also. This query works in pgAdmin but JpaRepository seems to have problem even if it is native query. How can I modify this query to work using JpaRepository?
#Query(value = "SELECT o.active_to::timestamp::date, count(o) as sum from work_order o group by o.active_to::timestamp::date order by o.active_to::timestamp::date asc limit 7", nativeQuery = true)
I get this error:
org.postgresql.util.PSQLException: ERROR: syntax error at or near ":"
Position: 19

You cannot use : because this is the character that starts a named parameter.
You have to use cast.
#Query(value = "SELECT cast(cast(o.active_to as timestamp) as date), count(o) as sum " +
"from work_order o group by cast(cast(o.active_to as timestamp) as date) " +
"order by cast(cast(o.active_to as timestamp) as date) asc limit 7",
nativeQuery = true)
Cast and :: are similar. Read more about here:
https://www.postgresql.org/docs/current/sql-expressions.html#SQL-SYNTAX-TYPE-CASTS

Select Top 1 records from MS SQL using Spring Data JPA

I am using the below #Query annotation to get the first few record from MS-SQL. It's showing error saying "< operator > or AS expected..."
#Query("SELECT Top 1 * FROM NEVS010_VEH_ACTV_COMMAND C WHERE C.EVS014_VIN = :vin ORDER BY C.EVS010_CREATE_S DESC")
CommandStatus findCommandStatusByVinOrderByCreatedTimestampDesc(#Param("vin") String vin);

You can also use findFirst and findTop as mentioned in the Docs:
findFirstByVinOrderByCreatedTimestampDesc(String vin)

Since the query is SQL (and not JPQL) one needs to set nativeQuery = true in the annotation:
#Query(nativeQuery = true, value = "SELECT Top 1 * FROM NEVS010_VEH_ACTV_COMMAND C WHERE C.EVS014_VIN = :vin ORDER BY C.EVS010_CREATE_S DESC")
CommandStatus findCommandStatusByVinOrderByCreatedTimestampDesc(#Param("vin") String vin);

For custom Queries without using nativeQuery, the field ROWNUM can be used.
Ex (in Kotlin but the same idea works in Java):
#Query("""
SELECT a
FROM Account a
WHERE a.bla = :ble
AND ROWNUM = 1
ORDER BY a.modifiedDate DESC
""")
fun findWhatever(#Param("ble") someParam: String)
I haven't found that on any doc so far. I just tested and it worked for Oracle, MySQL and H2

Spring jpa native query sorting adding prefix to order by field name

I have problem with sorting.
Repository method:
#Query(nativeQuery = true,
value = "SELECT D.ID as dealerId , D.NAME as dealerName, K.ID as kpiId, " +
"K.NAME as kpiName FROM REGION R, DEALER D, KPI K "
+ "WHERE R.IMPORTER_ID = :importerId "
+ "AND D.REGION_ID = R.ID "
+ "AND K.IMPORTER_ID = :importerId ")
Page<DealersKpiTargets> getDealersKpiTargets(#Param("importerId") Long importerId, Pageable pageable);
Pageable object:
Page request [number: 0, size 20, sort: name: DESC]
Hibernate log:
Hibernate: SELECT D.ID as dealerId , D.NAME as dealerName, K.ID as kpiId, K.NAME as kpiName FROM REGION R, DEALER D, KPI K WHERE R.IMPORTER_ID = ? AND D.REGION_ID = R.ID AND K.IMPORTER_ID = ? order by R.name desc limit ?
I don't understand where R.name prefix came from, in the order by part in Hibernate (towards the end).
For reference, I am using:
spring-data-jpa version 2.0.7.RELEASE
spring-boot-starter-data-jpa version 2.0.2.RELEASE
UPDATE
I have solved this by changing the query from the native query to jpa query and it's working. And I changed cartesian to join version.
#Query("SELECT dealerEntity.id AS dealerId , dealerEntity.name AS dealerName, kpiEntity.id AS kpiId, " +
"kpiEntity.name AS kpiName FROM KpiEntity kpiEntity "
+ "JOIN RegionEntity regionEntity ON regionEntity.importerEntity = kpiEntity.importerEntity "
+ "JOIN DealerEntity dealerEntity ON dealerEntity.importerEntity = regionEntity.importerEntity "
+ "WHERE kpiEntity.importerEntity = :importerEntity ")
Page<DealersKpiTargets> getDealersKpiTargets(#Param("importerEntity") ImporterEntity importerEntity, Pageable pageable);

here is jira ticket with more details which can be key for resolution (https://jira.spring.io/browse/DATAJPA-1613).
QueryUtils.ALIAS_MATCH
(?<=from)(?:\s)+([._[\P\\{Z}&&\P\\{Cc}&&\P\\{Cf}&&\P\\{P}]]+)(?:\sas)*(?:\s)+(?!(?:where|group\s*by|order\s*by))(\w+)
responsible to incorrect alias extraction. The solution for my case was rewrite native query, so it doesn't match the provided regexp.

This may be a little late to answer this question. But thought to share how I got around this issue.
For native queries, it seems like hibernate tries to use the alias of the first table used in the query when it applies the sorting criteria. In your case, the first table alias is R hence you see R.name desc in the query generated by hibernate.
One way to get around this issue is to wrap your query in a select clause and name it as R, like
"SELECT * FROM(SELECT D.ID as dealerId , D.NAME as dealerName, K.ID as kpiId, " +
"K.NAME as kpiName FROM REGION R, DEALER D, KPI K "
+ "WHERE R.IMPORTER_ID = :importerId "
+ "AND D.REGION_ID = R.ID "
+ "AND K.IMPORTER_ID = :importerId ) R"
This way at runtime hibernate would apply the sort criteria on top of your query which corresponds to R now.

It has Sort class for this you can use this maybe. Besides, it is easy to use.
https://docs.spring.io/spring-data/jpa/docs/current/reference/html/#jpa.query-methods.sorting

I faced similar issue especially in case of complex queries where there is ORDER BY with in the query. I was getting syntax error because a , was getting added before ORDER BY.
The way I solved this issue was to create a VIEW with the SELECT query having necessary fields required for result set and WHERE condition (so you can run query with params in WHERE condition against the VIEW). And write native query to SELECT FROM the VIEW
CREATE VIEW my_view AS (// your complex select query with required fields);
#Query("SELECT field1 AS alias1, field2 AS alias2 FROM my_view "
+ "WHERE field3 = :param1 AND field4 = :param2")
Page<MyDto> myFunction(#Param("param1") Long param1, #Param("param1") String param2, Pageable pageable);

How to use ::date in java JDBC hibernate?

PG Admin
I have a query on SQL Editor in PGadmin:
select * from list_taxi where last_update::date = now()::date
It show a good result, It show the taxi that online/update today.
(I use ::date).
Then I implement the query into Java using hibernate.
Java - JDBC Hibernate
I have a timestamp variable
Timestamp nowTime = new Timestamp(System.currentTimeMillis() );
I have query in Java DAO connected to Postgresql (JDBC - Hibernate)
ArrayList<Object[]> arrayList =
(ArrayList) em.createQuery("SELECT lt FROM ListTaxi lt
WHERE lt.lastUpdate::date = '" + nowTime + "'::date ")
.getResultList();
The result is error because of ::date
java.lang.IllegalArgumentException:
org.hibernate.hql.internal.ast.QuerySyntaxException: unexpected token:
: near line 1, column 75 [SELECT lt FROM model.ListTaxi lt WHERE
lt.lastUpdate::date = lt.lastUpdate::date]
How to solve this?

As a workaround you can do
WHERE lastUpdate > :startOfTodayTimestamp -- set this to :00:00:00 today
If you have dates from the future or want to do this not just with today, you also need to add an upper bound.