I know this question look similar, but I think for me the case is different
this is the exception message
Exception while fetching data (/periodicReport/userReport) :
org.hibernate.hql.internal.ast.QuerySyntaxException: Unable to locate
appropriate constructor on class
[com.analytics.entity.projections.UserParticipantCountAndDurationImpl].
Expected arguments are: java.util.UUID, long, java.util.Date [select
new
com.analytics.entity.projections.UserParticipantCountAndDurationImpl(generatedAlias0.userID,
count(distinct generatedAlias0.userID), sum(function('TIMEDIFF',
generatedAlias0.endTime, generatedAlias0.startTime))) from
com.analytics.entity.ConferenceParticipant as
generatedAlias0 group by generatedAlias0.userID order by :param0 desc]
I'm expecting the sum to be Long and I have specified it in the criteria query.
I don't have any idea where Date is defined
the snipet for the buider
Expression<Long> sum = criteriaBuilder.sum(
criteriaBuilder.function(
"TIMEDIFF",
Long.class,
participantRoot.<Date>get("endTime"),
participantRoot.<Date>get("startTime")
)
);
Expression<Long> count = criteriaBuilder.countDistinct(participantRoot.get("userID"));
reportQuery.select(criteriaBuilder.construct(
UserParticipantCountAndDurationImpl.class,
participantRoot.get("userID").as(UUID.class).alias(USER_ID),
count.as(Long.class).alias(PARTICIPANTS),
sum.as(Long.class).alias(PARTICIPANT_DURATION)
));
the class in question
#Data
#NoArgsConstructor
public class UserParticipantCountAndDurationImpl implements UserParticipantCountAndDuration, Serializable {
private UUID userID;
private long participants;
public long participantDuration;
public UserParticipantCountAndDurationImpl(
UUID userID,
long participants,
long participantDuration
) {
this.userID = userID;
this.participants = participants;
this.participantDuration = participantDuration;
}
}
And yes I have tried to change signature of the constructor. in that case the query will run, but then thows CastException since it java.util.Date
you need a Expression with the name of the unit you want to extract from the timediff function
public static class TimeUnitExpression extends BasicFunctionExpression<String> implements Serializable {
public TimeUnitExpression(CriteriaBuilderImpl criteriaBuilder, Class<String> javaType,
String functionName) {
super(criteriaBuilder, javaType, functionName);
}
#Override
public String render(RenderingContext renderingContext) {
return getFunctionName();
}
}
so your sum expression becomes
Expression<Long> sum = criteriaBuilder.sum(
criteriaBuilder.function(
"TIMEDIFF",
Long.class,
new TimeUnitExpression(null, String.class, "MILLISECOND"),
participantRoot.<Date>get("endTime"),
participantRoot.<Date>get("startTime")
)
);
TIMEDIFF return date time as the result, so it cant be casted to Long or double, the the Sql object in the raw result is DateTime, refer this.
I can solve this by using a function to get minutes from the datetime. but I solved this by getting difference of UNIXTIMESTAMP for both the datetime for the summation. Since UNIXTTIMESTAMP is always long I can cast it to Long or BigInteger
Related
I have a JPA Entity (Terminal) which uses an AttributeConverter to convert a Database String into a list of Objects (ProgrmRegistration). The converter just uses a JSON ObjectMapper to turn the JSON String into POJO objects.
Entity Object
#Entity
#Data
public class Terminal {
#Id
private String terminalId;
#NotEmpty
#Convert(converter = ProgramRegistrationConverter.class)
private List<ProgramRegistration> programRegistrations;
#Data
public static class ProgramRegistration {
private String program;
private boolean online;
}
}
The Terminal uses the following JPA AttributeConverter to serialize the Objects from and to JSON
JPA AttributeConverter
public class ProgramRegistrationConverter implements AttributeConverter<List<Terminal.ProgramRegistration>, String> {
private final ObjectMapper objectMapper;
private final CollectionType programRegistrationCollectionType;
public ProgramRegistrationConverter() {
this.objectMapper = new ObjectMapper().setSerializationInclusion(JsonInclude.Include.NON_EMPTY);
this.programRegistrationCollectionType =
objectMapper.getTypeFactory().constructCollectionType(List.class, Terminal.ProgramRegistration.class);
}
#Override
public String convertToDatabaseColumn(List<Terminal.ProgramRegistration> attribute) {
if (attribute == null) {
return null;
}
String json = null;
try {
json = objectMapper.writeValueAsString(attribute);
} catch (final JsonProcessingException e) {
LOG.error("JSON writing error", e);
}
return json;
}
#Override
public List<Terminal.ProgramRegistration> convertToEntityAttribute(String dbData) {
if (dbData == null) {
return Collections.emptyList();
}
List<Terminal.ProgramRegistration> list = null;
try {
list = objectMapper.readValue(dbData, programRegistrationCollectionType);
} catch (final IOException e) {
LOG.error("JSON reading error", e);
}
return list;
}
}
I am using Spring Boot and a JPARepository to fetch a Page of Terminal results from the Database.
To filter the results I am using a BooleanExpression as the Predicate. For all the filter values on the Entity it works well, but the List of objects converted from the JSON string does not allow me to easily write an Expression that will filter the Objects in the list.
REST API that is trying to filter the Entity Objects using QueryDSL
#GetMapping(path = "/filtered/page", produces = MediaType.APPLICATION_JSON_VALUE)
public Page<Terminal> findFilteredWithPage(
#RequestParam(required = false) String terminalId,
#RequestParam(required = false) String programName,
#PageableDefault(size = 20) #SortDefault.SortDefaults({ #SortDefault(sort = "terminalId") }) Pageable p) {
BooleanBuilder builder = new BooleanBuilder();
if (StringUtils.isNotBlank(terminalId))
builder.and(QTerminal.terminal.terminalId.upper()
.contains(StringUtils.upperCase(terminalId)));
// TODO: Figure out how to use QueryDsl to get the converted List as a predicate
// The code below to find the programRegistrations does not allow a call to any(),
// expects a CollectionExpression or a SubqueryExpression for calls to eqAny() or in()
if (StringUtils.isNotBlank(program))
builder.and(QTerminal.terminal.programRegistrations.any().name()
.contains(StringUtils.upperCase(programName)));
return terminalRepository.findAll(builder.getValue(), p);
}
I am wanting to get any Terminals that have a ProgramRegistration object with the program name equal to the parameter passed into the REST service.
I have been trying to get CollectionExpression or SubQueryExpression working without success since they all seem to be wanting to perform a join between two Entity objects. I do not know how to create the path and query so that it can iterate over the programRegistrations checking the "program" field for a match. I do not have a QProgamRegistration object to join with, since it is just a list of POJOs.
How can I get the predicate to match only the Terminals that have programs with the name I am searching for?
This is the line that is not working:
builder.and(QTerminal.terminal.programRegistrations.any().name()
.contains(StringUtils.upperCase(programName)));
AttributeConverters have issues in Querydsl, because they have issues in JPQL - the query language of JPA - itself. It is unclear what actually the underlying query type of the attribute is, and whether the parameter should be a basic type of that query type, or should be converted using the conversion. Such conversion, whilst it appears logical, is not defined in the JPA specification. Thus a basic type of the query type needs to be used instead, which leads to new difficulties, because Querydsl can't know the type it needs to be. It only knows the Java type of the attribute.
A workaround can be to force the field to result into a StringPath by annotating the field with #QueryType(PropertyType.STRING). Whilst this fixes the issue for some queries, you will run into different issues in other scenarios. For more information, see this thread.
Although the following desired QueryDsl looks like it should work
QTerminal.terminal.programRegistrations.any().name().contains(programName);
In reality JPA would never be able to convert it into something that would make sense in terms of SQL. The only SQL that JPA could convert it into could be as follows:
SELECT t.terminal_id FROM terminal t where t.terminal_id LIKE '%00%' and t.program_registrations like '%"program":"MY_PROGRAM_NAME"%';
This would work in this use case, but be semantically wrong, and therefore it is correct that it should not work. Trying to select unstructured data using a structured query language makes no sense
The only solution is to treat the data as characters for the DB search criteria, and to treat it as a list of Objects after the query completes and then perform filtering of the rows in Java. Although This makes the paging feature rather useless.
One possible solution is to have a secondary read only String version of the column that is used for the DB search criteria, that is not converted to JSON by the AttributeConverter.
#JsonIgnore
#Column(name = "programRegistrations", insertable = false, updatable = false)
private String programRegistrationsStr;
The real solution is do not use unstructured data when you want structured queries on that data Therefore convert the data to either a database that supports the JSON natively for queries or model the data correctly in DDL.
To have a short answer: the parameter used in the predicate on attribute with #QueryType must be used in another predicate on attribute of type String.
It's a clearly known issue describe in this thread: https://github.com/querydsl/querydsl/issues/2652
I simply want to share my experience about this bug.
Model
I have an entity like
#Entity
public class JobLog {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private String id;
#QueryType(PropertyType.STRING)
private LocalizedString message;
}
Issue
I want to perform some predicate about message. Unfortunately, with this configuration, I can't do this:
predicates.and(jobLog.message.likeIgnoreCase(escapedTextFilter));
because I have the same issues that all people!
Solution
But I find a way to workaround :)
predicates.and(
(jobLog.id.likeIgnoreCase(escapedTextFilter).and(jobLog.id.isNull()))
.or(jobLog.message.likeIgnoreCase(escapedTextFilter)));
Why it workaround the bug?
It's important that escapedTextFilter is the same in both predicate!
Indeed, in this case, the constant is converter to SQL in the first predicate (which is of String type). And in the second predicate, we use the conterted value
Bad thing?
Add a performance overflow because we have OR in predicate
Hope this can help someone :)
I've found one way to solve this problem, my main idea is to use mysql function cast(xx as char) to cheat hibrenate. Below is my base info. My code is for work , so I've made an example.
// StudentRepo.java
public interface StudentRepo<Student, Long> extends JpaRepository<Student, Long>, QuerydslPredicateExecutor<Student>, JpaSpecificationExecutor<Student> {
}
// Student.java
#Data
#AllArgsConstructor
#NoArgsConstructor
#EqualsAndHashCode(of = "id")
#Entity
#Builder
#Table(name = "student")
public class Student {
#Convert(converter = ClassIdsConvert.class)
private List<String> classIds;
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
}
// ClassIdsConvert.java
public class ClassIdsConvert implements AttributeConverter<List<String>, String> {
#Override
public String convertToDatabaseColumn(List<String> ips) {
// classid23,classid24,classid25
return String.join(",", ips);
}
#Override
public List<String> convertToEntityAttribute(String dbData) {
if (StringUtils.isEmpty(dbData)) {
return null;
} else {
return Stream.of(dbData.split(",")).collect(Collectors.toList());
}
}
}
my db is below
id
classIds
name
address
1
2,3,4,11
join
北京市
2
2,31,14,11
hell
福建省
3
2,12,22,33
work
福建省
4
1,4,5,6
ouy
广东省
5
11,31,34,22
yup
上海市
-- ----------------------------
-- Table structure for student
-- ----------------------------
DROP TABLE IF EXISTS `student`;
CREATE TABLE `student` (
`id` int(11) NOT NULL,
`classIds` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL,
`name` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL,
`address` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL,
PRIMARY KEY (`id`) USING BTREE
) ENGINE = InnoDB CHARACTER SET = utf8mb4 COLLATE = utf8mb4_general_ci ROW_FORMAT = Dynamic;
SET FOREIGN_KEY_CHECKS = 1;
Use JpaSpecificationExecutor solve the problem
Specification<Student> specification = (root, query, criteriaBuilder) -> {
String classId = "classid24"
String classIdStr = StringUtils.wrap(classId, "%");
var predicate = criteriaBuilder.like(root.get("classIds").as(String.class), classIdStr);
return criteriaBuilder.or(predicate);
};
var students = studentRepo.findAll(specification);
log.info(new Gson().toJson(students))
attention the code root.get("classIds").as(String.class)
In my opinion, if I don't add .as(String.class) , hibernate will think the type of student.classIds is list and throw an Exception as below.
SQL will like below which runs correctly in mysql. But hibnerate can't work.
org.springframework.dao.InvalidDataAccessApiUsageException: Parameter value [%classid24%] did not match expected type [java.util.List (n/a)]; nested exception is java.lang.IllegalArgumentException: Parameter value [%classid24%] did not match expected type [java.util.List (n/a)]
SELECT
student0_.id AS id1_0_,
student0_.class_ids AS class_ids2_0_
FROM
student student0_
WHERE
student0_.class_ids LIKE '%classid24%' ESCAPE '!'
if you add .as(String.class) , hibnerate will think the type of student.classIds as string and won't check it at all.
SQL will be like below which can run correct in mysql. Also in JPA.
SELECT
student0_.id AS id1_0_,
student0_.class_ids AS class_ids2_0_
FROM
student student0_
WHERE
cast( student0_.class_ids AS CHAR ) LIKE '%classid24%' ESCAPE '!'
when the problem is solved by JpaSpecificationExecutor, so I think this can be solve also in querydsl. At last I find the template idea in querydsl.
String classId = "classid24";
StringTemplate st = Expressions.stringTemplate("cast({0} as string)", qStudent.classIds);
var students = Lists.newArrayList<studentRepo.findAll(st.like(StringUtils.wrap(classId, "%"))));
log.info(new Gson().toJson(students));
it's sql is like below.
SELECT
student0_.id AS id1_0_,
student0_.class_ids AS class_ids2_0_
FROM
student student0_
WHERE
cast( student0_.class_ids AS CHAR ) LIKE '%classid24%' ESCAPE '!'
I want to make a request that inserts data into my database. The table has 4 columns: ID_DOCUMENT (PK), ID_TASK, DESCRIPTION, FILEPATH
Entity
...
#Column(name = "ID_TASK")
private Long idTask;
#Column(name = "DESCRIPTION")
private String description;
#Column(name = "FILEPATH")
private String filepath;
...
Repository
#Modifying
#Query("insert into TaskDocumentEntity c (c.idTask, c.description, c.filepath) values (:id,:description,:filepath)")
public void insertDocumentByTaskId(#Param("id") Long id,#Param("description") String description,#Param("filepath") String filepath);
Controller
#RequestMapping(value = "/services/tasks/addDocument", method = RequestMethod.POST)
#ResponseBody
public void set(#RequestParam("idTask") Long idTask,#RequestParam("description") String description,#RequestParam("filepath") String filepath){
//TaskDocumentEntity document = new TaskDocumentEntity();
taskDocumentRepository.insertDocumentByTaskId(idTask,descriere,filepath);
}
When I run my test, I get this error:
Caused by: org.hibernate.hql.ast.QuerySyntaxException: expecting OPEN, found 'c' near line 1, column 32 [insert into TaskDocumentEntity c (c.idTask, c.descriere, c.filepath) values (:id,:descriere,:filepath)]
I tried to remove the alias c, and still doesn`t work.
Spring data provides out of the box save method used for insertion to database - no need to use #Query. Take a look at core concepts of springData (http://docs.spring.io/spring-data/jpa/docs/current/reference/html/#repositories.core-concepts)
thus in your controller just create object TaskDocumentEntity and pass it to repository
#RequestMapping(value = "/services/tasks/addDocument", method = RequestMethod.POST)
#ResponseBody
public void set(#RequestParam("idTask") Long idTask,#RequestParam("description") String description,#RequestParam("filepath") String filepath){
// assign parameters to taskDocumentEntity by constructor args or setters
TaskDocumentEntity document = new TaskDocumentEntity(idTask,descriere,filepath);
taskDocumentRepository.save(document);
}
There is a way to do this but it depends on the db you're using. Below worked for me in Oracle (using Dual table):
#Repository
public interface DualRepository extends JpaRepository<Dual,Long> {
#Modifying
#Query("insert into Person (id,name,age) select :id,:name,:age from Dual")
public int modifyingQueryInsertPerson(#Param("id")Long id, #Param("name")String name, #Param("age")Integer age);
}
So in your case, it would be (if Oracle):
#Modifying
#Query("insert into TaskDocumentEntity (idTask,description,filepath) select :idTask,:description,:filepath from Dual")
public void insertDocumentByTaskId(#Param("idTask") Long id,#Param("description") String description,#Param("filepath") String filepath)
I'm not sure which db you're using, here's a link which shows at the bottom which db's support select stmts without a from clause : http://modern-sql.com/use-case/select-without-from
I'm developing a spring mvc webapp with spring data and hibernate.
I've an entity composed by a boolean field and by an Integer field.
At beginning the boolean field is false and Integer field is null.
When boolean field become true I need to assign to the Integer field a unique value equals to MAX(seq) +1
To do it, I write my service method in this way:
#Override
public synchronized Obj save(Obj entry) {
if (entry.getBool() && entry.getSeq() == null){
Integer seq = objRepository.getLastSeq();
if (seq == null){
seq = 1;
}
entry.setSeq(seq);
}
return entry.save(entry);
}
And in my Reposiroty:
#Query("select MAX(seq)+1 FROM Obj")
Integer getLastSeq();
I put synchronized keyword to service method in order to be sure that only a thread at a time can get an unique MAX+1 number.. but I'm not sure if it works in all situation and if it is the right way.
Can I be sure that it guarantee unicity of seq?
Thank you
Marco
It seems like your Integer is entry id or isn't it ? So why not to use database sequence, with #id adnotation for example :
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
#Column(name = "id")
private Long id;
Example how to use initializing bean for that purpose.
#Service
public class SequenceInitializer implements InitializingBean{
#Autowired
private ObjRepository objRepository;
#Autowired
private Service service;
#Override
public void afterPropertiesSet() throws Exception {
try {
Integer max = objRepository.getLastSeq();
service.setLastSeq(max);
} catch(Exception e){...}
}
In your service setLastSeq will set AtomicInteger field.
Am trying to get an object of count(*) and sum() through a hibernate query which actually uses another object. Here's what I'm doing :
String query = select new org.rangde.domain.AggregatedCount(count(*), sum(lps.loanAmount - lps.loanPledged - lps.loanRaised)) from LoanProfileSnapshot lps where lps.loanState in (:loanStates)
List<AggregatedCount> counts = getHibernateTemplate().findByNamedParam(query, params, values);
return counts.size() > 0 ? counts.get(0) : null;
and this is the class AggregatedCount (have removed getters and setters)
public class AggregatedCount {
private int id;
private BigInteger count;
private BigDecimal sum;
public AggregatedCount(){}
public AggregatedCount(BigInteger count, BigDecimal sum){
this.count = count;
this.setSum(sum);
}
}
This is the exception i get when i run the query.
Unable to locate appropriate constructor on class [org.domain.AggregatedCount] ... nested exception is org.hibernate.hql.ast.QuerySyntaxException: Unable to locate appropriate constructor on class [org.domain.AggregatedCount] ...
I tried having the sum as Double and BigInteger and still I'm getting the same exception.
Any help would be appreciated. I'd prefer to stick to findByNamedParam for this because there are a lot of conditions that I'm checking within the code before the final query is generated. Thanks.
Although my answer seems a little bit too late maybe it will help others ..
The necessary datatype is Long for the count and sum depends on the datatype in the entity.
It also depends on the hibernate version you are using:
https://community.jboss.org/wiki/HibernateCoreMigrationGuide35?_sscc=t
public class AggregatedCount {
private Long count;
private Long sum;
public AggregatedCount(Long count, Long sum){
this.count = count;
this.setSum(sum);
}
}
What would the equivalent of Oracle's DECODE() function be in the Hibernate Criteria API?
An SQL example of what I need to do:
SELECT DECODE(FIRST_NAME, NULL, LAST_NAME, FIRST_NAME) as NAME ORDER BY NAME;
Which returns LAST_NAME to NAME in the event that FIRST_NAME is NULL.
I would prefer to use the Criteria API but could use HQL if there's no other way.
Check out org.hibernate.criterion.Projections.sqlProjection(...).
Similar to this answer.
For the example you give, you could use COALESCE().
How to simulate NVL in HQL
You can use sqlRestriction to call the native decode function.
session.createCriteria(Table.class).add(Restrictions.sqlRestriction("decode({alias}.firstName,null,
{alias}.lastName,
{alias}.firstName)"))
With HQL, the Oracle dialect already has coalesce and nvl functions, or if you really need decode, you could subclass the dialect and add it as a custom function. I don't know if Hibernate supports a variable length number of arguments like decode does, but worst-case, you could create decode1, decode2, etc to support different numbers of arguments.
Or, if you aren't using the column in a where or group by, you could just bring both attributes back and do the check in Java.
Ended up adding a formula for it:
<property name="name" formula="coalesce(first_name, last_name)"/>
I'm concerned about cross-database problems and possibly efficiency problems with this approach so I'm willing to change the accepted answer.
You can Use Hibernate #Type attribute,Based on your requirement you can customize the annotation and apply on top of the fied. like :
public class PhoneNumberType implements UserType {
#Override
public int[] sqlTypes() {
return new int[]{Types.INTEGER, Types.INTEGER, Types.INTEGER};
}
#Override
public Class returnedClass() {
return PhoneNumber.class;
}
// other methods
}
First, the null SafeGet method:
#Override
public Object nullSafeGet(ResultSet rs, String[] names,
SharedSessionContractImplementor session, Object owner) throws HibernateException,
SQLException {
int countryCode = rs.getInt(names[0]);
if (rs.wasNull())
return null;
int cityCode = rs.getInt(names[1]);
int number = rs.getInt(names[2]);
PhoneNumber employeeNumber = new PhoneNumber(countryCode, cityCode, number);
return employeeNumber;
}
Next, the null SafeSet method:
#Override
public void nullSafeSet(PreparedStatement st, Object value,
int index, SharedSessionContractImplementor session)
throws HibernateException, SQLException {
if (Objects.isNull(value)) {
st.setNull(index, Types.INTEGER);
} else {
PhoneNumber employeeNumber = (PhoneNumber) value;
st.setInt(index,employeeNumber.getCountryCode());
st.setInt(index+1,employeeNumber.getCityCode());
st.setInt(index+2,employeeNumber.getNumber());
}
}
Finally, we can declare our custom PhoneNumberType in our OfficeEmployee entity class:
#Entity
#Table(name = "OfficeEmployee")
public class OfficeEmployee {
#Columns(columns = { #Column(name = "country_code"),
#Column(name = "city_code"), #Column(name = "number") })
#Type(type = "com.baeldung.hibernate.customtypes.PhoneNumberType")
private PhoneNumber employeeNumber;
// other fields and methods
}
This might solve your problem, This will work for all database. if you want more info refer :: https://www.baeldung.com/hibernate-custom-types
If you can use HQL the you can replace DECODE with CASE.
You can update your query from,
SELECT DECODE(FIRST_NAME, NULL, LAST_NAME, FIRST_NAME) as NAME ORDER BY NAME;
to,
SELECT CASE WHEN FIRST_NAME = NULL then LAST_NAME ELSE FIRST_NAME END as NAME ORDER BY NAME;