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JPA - Select All Rows from Dynamic Table Name

Hi guys I am new to jpa, named queries, etc.. and I need something like this:
select t from :tableName t
Later in code I want something like this:
em.createQuery(...);
setParameter("tableName", "Person")
Result would be:
select * from person
How to write such a generic jpa query statement allowing to select all rows from :tableName which may be defined at runtime? thanks in advance

Try this I think this works well
EntityManagerFactory emfactory=Persistence.createEntityManagerFactory("Eclipselink_JPA" );
EntityManager entitymanager = emfactory.createEntityManager();
Query query = entitymanager.
createQuery("Select p from Person p");
List<String> list = query.getResultList();

setParameter("foo", foo) is used to set the value for column of the table not to set the table name. I do not think it will work, as you want to set the table name dynamically.
You can try this:
public returnType foo(String tableName){
String jpql = "SELECT t FROM " + tableName+ " t";
Query query = em.createQuery(jpql);
//rest of the code
}

Pass the dynamically created query (according to condition) in #Query annotation

I am using the #Query annotation to execute the query in spring repository.
But I want to change the some part or make a new query according to the condition and pass in the #Query("pass here the query according to condition")
This is my query
#Query("SELECT ds.symptom FROM DoctorSymptomsModel ds where ds.doctorId = :doctorId and ds.isMostUsed = :isMostUsed)
If some condition satisfy then concat the "ORDER BY createdDate" part in query.
Or
Can I make the variable and set the query in that variable and set like that
String query = SELECT ds.symptom FROM DoctorSymptomsModel ds where
ds.doctorId = :doctorId and ds.isMostUsed = :isMostUsed
if(result){
query = SELECT ds.symptom FROM DoctorSymptomsModel ds where ds.doctorId =
:doctorId and ds.isMostUsed = :isMostUsed ORDER BY createdDate
}
//pass the query variable here
#Query(query)
List<String> findDoctorSymptomsModelList(#Param("doctorId") long doctorId,
#Param("isMostUsed") boolean isMostUsed);

To make a dynamic query, you should think about CriteriaQuery. Take a look at this link for brief introduction.

Not able to fetch resultset in Hibernate using HQL

I'm triggering a query using HQL, normally it should return empty resultset as it doesn't have any records w.r.t it. But, it throws
org.hibernate.exception.SQLGrammarException: could not extract ResultSet
at org.hibernate.exception.internal.SQLStateConversionDelegate.convert(SQLStateConversionDelegate.java:106)
My code is
String hql = "FROM com.pck.Person where userId = " + userId;
Query query = session.createQuery(hql);
#SuppressWarnings("unchecked")
List<Dashboard> listUserDetails = query.list(); <-- Problem here.
I'm expecting list size is 0 because there are no records w.r.t userId passed.
What changes do I need to do?

Lets say the value of userId was "abc12"
Given your code, the value of the string called hql would become:
"FROM com.pck.Person where userId = abc12"
If you took the value of that string and tried to run it as a query on any database, most of them would fail to understand that abc12 is a string. Normally it would be interpreted as a variable.
As other users mentioned including the single quotes would produce the desired query, but the recommended way to assign parameter values is this:
String hql = "FROM com.pck.Person where userId = :id"
query.setParameter("id", userId);

Looks like you are missing single quotes around userid.
Try with "FROM com.pck.Person where userId = '" + userId + "'";
or
Use named parameters with query.setParameter("userid", userId);
Posting the full stacktrace would help if this doesn't solve.

How can I add a value to a column?

I want to add a value to an existing column, but I don't want to have to select it first. Right now I would have to do something like
// run hql in a named query
from Employee where id = :id
// after running the above
e.setBonus(e.getBonus() + 100); // add 100 to e's bonus
// commit to database
HibernateUtil.saveOrUpdate(e);
But I want something that's just one-and-done - something like
update Employee e set e.bonus = e.bonus + 100
Is this something I can do in Hibernate? If so, how. If not, what's the suggested best practice for such an update?

You could create a hql query that just does an update
Query updateBonus = createQuery("UPDATE Employee SET bonus = bonus+100 WHERE id = :id" );
updateBonus.setInteger("id", employee.getId());
updateBonus.executeUpdate();

Yes, you can do it as intended with hql query. Try such code:
Session session = sessionFactory.openSession();
Transaction tx = session.beginTransaction();
String hql="update Employee e set e.bonus = e.bonus + :p where id=:id";
session.createQuery(hql).setInteger("p",100).setInteger("id",id).executeUpdate();
tx.commit();
session.close();
More info you can find by the link

Hibernate Exception while executing query

Following is my code snippet:
ApplicationContext ctx = new ClassPathXmlApplicationContext(
"classpath*:META-INF/spring/applicationContext*.xml");
JpaTransactionManager jpatm = (JpaTransactionManager) ctx
.getBean("transactionManager");
EntityManager em = jpatm.getEntityManagerFactory()
.createEntityManager();
String sqlQuery = "SELECT suc FROM SubUsrCont suc, UDMap uDMap WHERE suc.userid = uDMap.userid AND uDMap.parentuserid = :parentuserid";
TypedQuery<SubUsrCont> query = (TypedQuery<SubUsrCont>) em.createQuery(sqlQuery, SubUsrCont.class);
query.setParameter("parentuserid", parentid);
ArrayList<SubUsrCont> listContent = (ArrayList<SubUsrCont>) query.getResultList();
But when ever executed I get the following error:
[http-8080-1] ERROR org.hibernate.hql.PARSER - line 1:92: expecting OPEN, found '.'
Can anybody help???

Well, I found it and successfully tested it as well. It was due to my POJO package name. Previously it was in.myproject.myname. I changed it to com.myproject.myname. HQL was taking in as the SQL Keyword IN and was looking for OPEN '('.

Why are you using a Native SQL query inside em.createQuery()? This will not work because HQL can not have SELECT and furthermore you don't set the value for parameter :parentuserid.
String sqlQuery = "FROM SubUsrCont suc, UDMap uDMap WHERE suc.userid = uDMap.userid AND uDMap.parentuserid = :parentuserid";
TypedQuery<SubUsrCont> query = (TypedQuery<SubUsrCont>) em.createQuery(sqlQuery, SubUsrCont.class);
query.setParameter("parentuserid", <PARENT USER ID TO BE SEARCHED>);
Try this and see

If you would like to execute SQL use createNativeQuery. Also try "SELECT suc.* ...
Also you don't set the parameter :parentuserid
Use query setParameter("parentuserid",someValue)