i have table named gifts that contains field company_value_id and i want to make select for all company_value_id,count(company_value_id) so that the result will be list of object and each object will contain company_value_id,count(company_value_id)
i am using spring jpa with annotations as follows:
public interface GiftsRepository extends JpaRepository<Gifts, String> {
#Query("from Gifts g where g.companyGuid = :companyGuid")
List<Gifts> getGiftsByCompany(#Param("companyGuid") String companyGuid);
}
please advise, thanks.
i was able to accomplish it as follows:
#Query("select g.value.id,cr.value.name,count(g.value.id) from Gift g where g.user.id=:userId group by g.value")
List<Object[]> getUserGifts(
#Param("userId") String userId);
and in the service layer i extract the values as follows:
List<Object[]> results = giftsRepository
.getUserGifts(userId);
for (Object[] result : results) {
String id = (String) result[0];
String name = (String) result[1];
int count = ((Number) result[2]).intValue();
}
You need add a parameter to your function,just like this:
#Query("from Gifts g where g.companyGuid = :companyGuid")
List<Gifts> getGiftsByCompany(#Param("companyGuid") String companyGuid,Pageable pageable);
and the pageabel can be create like this:
Pageable pageable = new PageRequest(pageIndex, pageSize, Direction.ASC, sortColumn);
Related
The following ItemReader get a list of thousands accounts that need to be retrieved from MD database.
In this approach I am limited to the number of accounts that I can use:
#StepScope
#Bean
public ItemReader<OmsDto> itemReader(#Value("#{stepExecutionContext[accOms]}") List<String> notLoadedFiles) {
StringBuffer buffer = new StringBuffer();
notLoadedFiles.forEach(accountNumber -> buffer.append("'"+accountNumber+"',"));
buffer.replace(buffer.length()- 1, buffer.length(), "");
DriverManagerDataSource mdDataSource = new DriverManagerDataSource();
mdDataSource.setDriverClassName("prestosql");
mdDataSource.setUrl("jdbc:presto:....");
mdDataSource.setUsername(".....");
mdDataSource.setPassword("....");
String sql ="SELECT DISTINCT "
.....
.....
+ "FROM MD.ONLINE WHERE acct IN ";
JdbcCursorItemReader<OmsDto> reader = new JdbcCursorItemReader<OmsDto>();
reader.setVerifyCursorPosition(false);
reader.setDataSource(mdDataSource);
reader.setSql(sql);
reader.open(new ExecutionContext());
BeanPropertyRowMapper<OmsDto> rowMapper = new BeanPropertyRowMapper<>(OmsDto.class);
rowMapper.setPrimitivesDefaultedForNullValue(true);
reader.setRowMapper(rowMapper);
return reader;
}
What is the correct way to create dynamic IN Query (WHERE A IN (…, .., …)) ?
Thank you
Here is an example to generate IN query dynamically,
Example Query: SELECT * FROM USER WHERE ID IN (?,?,?,?,?)
List ids = List.of(1,2,3,4,5);
String inParams = String.join(",", ids.stream().map(id -> "?").collect(Collectors.toList()));
String query = String.format("SELECT * FROM USER WHERE ID IN (%s)", inParams);
Note that, if your query IN clause parameters limit more than 1000, it's better to use TEMP tables. Here some examples on github
#Query("Select DISTINCT ord from Order ord where ord.status = :status)
public Page<Order> search(String status) ;
Is there a way to allow status to match for multiple values?
like
GET /search?status="done or pending"
#User9123 has put it correctly,
#Query("Select DISTINCT ord from Order ord where (ord.status in :statusList or ord.status is null)")
public Page<Order> search(List<String> statusList) ;
Also to get list of parameter in your controller change request like this.
GET /search?status=done,pending
and in controller
#RequestMapping("/search")
public void search(#RequestParam List<String> statusList)
{
// Handle values here
}
I am programming function for pagination in my repository layer. Function receive as parameters spring's pageable object and some value like this:
public Page<Foo> filterFoo(Pageable pageable, String value) {
CriteriaBuilder cb = entityManager.getCriteriaBuilder();
CriteriaQuery<Foo> fooQuery = cb.createQuery(Foo.class);
Root<Foo> foo = fooQuery .from(Foo.class);
fooQuery .where(adding predicate for match value);
List<Foo> result = entityManager.createQuery(fooQuery )
.setFirstResult((pageable.getPageNumber() - 1) * pageable.getPageSize())
.setMaxResults(pageable.getPageSize())
.getResultList();
return new PageImpl<>(result, pageable, xxxx);
}
Function return spring's PageImpl object filled with my result. To PageImpl I also need set total count of objects which suit predicates. This count number have to be of course without maxResult and firstResult. Is possible create another database call with my fooQuery to get total database records for that query without limit? What is the best practise to use pageable and criteria api in JPA? Thank you in advice.
Because generated SQL uses aliases - you may need make separate query for get total count of rows.
For example:
CriteriaQuery<Long> countQuery = cb.createQuery(Long.class);
countQuery.select(cb.count(countQuery.from(Foo.class)));
if (Objects.nonNull(filters)) {
countQuery.where(filters);
}
return new PageImpl<>(result, pageable, em.createQuery(countQuery).getSingleResult());
where filters is equal to your adding predicate for match value expression.
Also, you may use a TupleQuery with custom SQL function for calculate count of rows in one select query.
Like this:
public class SqlFunctionsMetadataBuilderContributor implements MetadataBuilderContributor {
#Override
public void contribute(MetadataBuilder metadataBuilder) {
metadataBuilder.applySqlFunction(
"count_over",
new SQLFunctionTemplate(
StandardBasicTypes.LONG,
"(count(?1) over())"
)
);
}
}
and Criteria:
public Page<Foo> findAll(Specification<Foo> specification, Pageable pageable) {
CriteriaQuery<Tuple> cq = cb.createTupleQuery();
Root<Foo.class> fooRoot = cq.from(Foo.class);
cq.select(cb.tuple(fooRoot, cb.function("count_over", Long.class, fooRoot.get("id"))));
Predicate filters = specification.toPredicate(fooRoot, cq, cb);
if (Objects.nonNull(filters)) {
cq.where(filters);
}
TypedQuery<Tuple> query = em.createQuery(cq);
query.setFirstResult((int) pageable.getOffset());
query.setMaxResults(pageable.getPageSize());
List<Tuple> result = query.getResultList();
if (result.isEmpty()) {
return new PageImpl<>(List.of());
}
return new PageImpl<>(
result.stream().map(tuple -> (Foo) tuple.get(0)).collect(toUnmodifiableList()),
pageable,
(long) result.get(0).get(1)
);
}
See more about SQLFunction: https://vladmihalcea.com/hibernate-sql-function-jpql-criteria-api-query/ and Custom SQL for Order in JPA Criteria API
I have this request working good with queryDSL :
Iterable<AO> query_result = new JPAQuery(entityManager).from(ao)
.leftJoin( ao.lots , lot )
.leftJoin( ao.acs , ac )
.where(where).distinct()
.list(ao);
But what is its equivalent if we use it with spring data jpa
ao_respository.findAll(Predicate arg0, Pageable arg1);
Because i want to return a Page and just with querydsl it doesn't implement Page without spring data jpa.
I try to put my where in Predicate arg0 but i got this exception
Undeclared path 'lot '. Add this path as a source to the query to be able to reference it
where lot is declared as QLot lot = QLot.lot;
I created my own Page class and executed the query like this:
JPAQuery query = new JPAQuery(entityManager).from(ao)
.leftJoin( .. ).fetch()
.leftJoin( .. ).fetch()
...
.where(where)
MaPage<AO> page = new MaPage<AO>();
page.number = pageNumber+1;
page.content = query.offset(pageNumber*pageSize).limit(pageSize).list(ao);
page.totalResult = query.count();
My Page class:
public class MaPage<T> {
public List<T> content;
public int number;
public Long totalResult;
public Long totalPages;
...
}
It works but I got this warning
nov. 21, 2014 6:48:54 AM
org.hibernate.hql.internal.ast.QueryTranslatorImpl list WARN:
HHH000104: firstResult/maxResults specified with collection fetch;
applying in memory!
Returning a Page:
JPAQuery query =
...
.orderBy(getOrderSpecifiers(pageable, MyEntity.class))
.limit(pageable.getPageSize())
.offset(pageable.getOffset());
long total = query.fetchCount();
List<MyEntity> content = query.fetch();
return new PageImpl<>(content, pageable, total);
And I created this function to get OrderSpecifier:
private OrderSpecifier[] getOrderSpecifiers(#NotNull Pageable pageable, #NotNull Class klass) {
// orderVariable must match the variable of FROM
String className = klass.getSimpleName();
final String orderVariable = String.valueOf(Character.toLowerCase(className.charAt(0))).concat(className.substring(1));
return pageable.getSort().stream()
.map(order -> new OrderSpecifier(
Order.valueOf(order.getDirection().toString()),
new PathBuilder(klass, orderVariable).get(order.getProperty()))
)
.toArray(OrderSpecifier[]::new);
}
If you have a working, complex query in querydsl and you want to use springdata pagination, you have to:
make your querydsl/repository method return Page<T>
Page<YourEntity> yourSelect(Pageable aPageable)
use querydsl offset and limit to page your result set
List<YourEntity> theResultList = jpaQueryFactory
.select(<whatever complext jpaquery you like>)
.offset(aPageable.getOffset())
.limit(aPageable.getPageSize())
.fetch();
provide a LongSuplier counting all available results with respect to your query and use PageableExecutionUtils to return the result as Page
final long theCount = jpaQueryFactory
.selectFrom(<your select to count all results>)
.fetchCount();
return PageableExecutionUtils.getPage(theResultList, aPageable, () -> theCount);
My domain model is like this:
CollectedData {
String name;
String description;
int count;
int xAxis,
int yAxis
}
Using Spring data repository query, I would like to retrieve all the unique rows (unique with name, xAxis, yAxis)
I am trying something like this
#Query("select distinct a.name, a.xAxis, a.yAxis from CollectedData a")
List<CollectedData> findAllDistinctData();
So, when I do
List<CollectedData> records= findAllDistinctData();
for (CollectedData record : records) { //Exception on this line
}
Exception
[Ljava.lang.Object; cannot be cast to CollectedData.
Is there any other way to write query for this ?
#Query return ArrayList of Object(s) instead of specific type of object. so you have to define some thing like
#Query("select distinct a.name, a.xAxis, a.yAxis from CollectedData a")
List<Object> findAllDistinctData();
then cast according to your requirement,
List<Object> cdataList=findAllDistinctData();
for (Object cdata:cdataList) {
Object[] obj= (Object[]) cdata;
String name = (String)obj[0];
String description = (String)obj[1];;
...
}
Instead of returning an object you can use JPA's constructor expression feature to return a more specific object holding only the columns you're interested in. See also following answer:
JPQL Constructor Expression - org.hibernate.hql.ast.QuerySyntaxException:Table is not mapped
According to your example you could create a new Object with only the columns you are interested in:
SELECT DISTINCT new com.mypackage.MyInterestingCollectedData(a.name, a.xAxis, a.yAxis) from CollectedData a
If you want to select complete object based on distinct values of multiple columns,
In that case the native query would be the option.
e.g.
#Query(
value = "select distinct on (column1, column2, column3) * From my_table where someId=: order by column1 asc,column2 desc,column3 desc,column4 desc",
nativeQuery = true
)
fun finalAllDistinctBy(containerId: String): List<MyTable>