just switched to spring boot from .NET Core, in .NET core we can easily nest a select inside a select like this:
var result = from c in context.Cars
join br in context.Brands
on c.BrandId equals br.Id
join col in context.Colors
on c.ColorId equals col.Id
select new CarDetailDto
{
Id = c.Id,
BrandName = br.Name,
CarName = c.Name,
ColorName = col.Name,
DailyPrice = c.DailyPrice,
ModelYear = c.ModelYear,
CarImages = (from cimg in context.CarImages
where cimg.CarId == c.Id
select new CarImage
{
Id = cimg.Id,
ImagePath = cimg.ImagePath,
CarId = c.Id,
Date = cimg.Date
}).ToList()
};
I want to do that in JPQL as well but didnt manage to solve
#Query( select column1, column2, column3 from tablename1 where coluname=(select columname from tablename2 where columnname=abcd) )
Your JPQL query should look like above.
Whatever subquery you write with condition.
If your query is fetching 3 column you need to create a DTO with same column name.
If your query is fetching list of rows then your actual jpql will look like this.
#Query( select column1, column2, column3 from tablename1 where coluname=
(select columname from tablename2 where columnname=abcd) )
List<ResultDTO> findAllResultList(Parameter value);
Above it is mapping the result to list of DTO objects to result rows.
If your query is fetching single row then your actual jpql will look like this.
#Query( select column1, column2, column3 from tablename1 where coluname=
(select columname from tablename2 where columnname=abcd) )
ResultDTO findResult(Parameter value);
The single result is mapped to one DTO object.
Make sure your result column name and DTO column name matches
Using the JPA repository call the names of the method which you used for the particular query.
Related
Iam using coalesce mybatis switch case in my query, where iam getting error like
Error querying database. Cause: java.sql.SQLException: ORA-01427:
single-row subquery returns more than one row
this is my query
(select
(case when (coalesce(t1.col1,t2.col1, t1.col2, t1.col3) is null)
then (select sysdate from dual)
else (coalesce(t1.col1,t2.col1, t1.col2, t1.col3))
end )
from table1 t1
join table2 t2
on t1.id IN (t2.id))
Thanks in advance
Seems you have a lot of () but overall you should use = operator and not IN (t2.id) for join t2.id
select
case when coalesce(t1.col1,t2.col1, t1.col2, t1.col3) is null
then sysdate
else coalesce(t1.col1,t2.col1, t1.col2, t1.col3)
end
from table1 t1
join table2 t2 on t1.id = t2.id
And looking at the code you posted in sample you have a select as a column result and this select return several rows, ( this raise the error). You also have a mixin of join syntax some based on explicit join syntax some based on old implicit join syntax based on comma separated table name and where condition. You should try using this
<select id="Trigger" parameterType="hashmap" resultType="java.util.HashMap" flushCache="true">
SELECT
select case when coalesce(table1.col1, table2.col2,table1.col3, table1.col4) is null
then sysdate
else coalesce(table1.col1, table2.col2,table1.col3, table1.col4) end as "ProgressDate"
, table3.id as "ID"
from table1
INNER join table2 on table1.id = table2.id
INNER JOIN table3 ON table1.id = table3.id
INNER JOIN table4 table2.action = table4.action
WHERE table3.transaction = #{inputvaluepassed}
</select>
The query you mention in the question takes the place of a scalar subquery included in another... main query. I formatted the whole query (for readability) and it looks like this:
SELECT
(
select case when coalesce(table1.col1, table2.col2,table1.col3,
table1.col4) is null
then (select sysdate from dual)
else coalesce(table1.col1, table2.col2,table1.col3, table1.col4)
end
from table1
join table2 on table1.id = table2.id
) as "ProgressDate",
table3.id as "ID"
FROM table3, table1, table2, table4
WHERE table3.transaction = #{inputvaluepassed}
AND table1.id = table3.id
AND table2.id=table1.id and table2.action = table4.action
Now, by definition, scalar subqueries can only return zero or one row. In your case it seems that at runtime this subquery is returning multiple rows, and the main query crashes.
You'll need to somehow produce a single row at most: maybe by aggregating the rows (using GROUP BY), maybe by picking one row only from the result set (using LIMIT); there are other options. If we choose the to limit the rows to 1 at most your query could look like:
SELECT
(
select case when coalesce(table1.col1, table2.col2,table1.col3,
table1.col4) is null
then (select sysdate from dual)
else coalesce(table1.col1, table2.col2,table1.col3, table1.col4)
end
from table1
join table2 on table1.id = table2.id
limit 1 -- added this line
) as "ProgressDate",
table3.id as "ID"
FROM table3, table1, table2, table4
WHERE table3.transaction = #{inputvaluepassed}
AND table1.id = table3.id
AND table2.id=table1.id and table2.action = table4.action
This is just one possible cheap solution to the issue. A better understanding on how to pick the right row over multiples ones can produce a better solution.
I want to retrieve count and list of data in one query only which I want to write on JPA repository. I wrote it using a constructor and executed using entity manager, but it didn't work. It gave me a QuerySyntaxException. Here is my query:
String hql = "select new core.abc(select count(*) from abc as m where m.Id in :Ids and m.Type = :Type,"
+ "select max(m.modificationTime) from abc as m where m.Id in :Ids and m.Type = :Type )";
How can I write such kind of query in JPA repository?
I just figure out your use case senario is that you want to get all records from table as well as total-count of records and max value of a specific column , you named that column as modificationTime. So onething will be happen in this case, if you want to intract with table with single query, Than you will get useless data for both column named as max and count.
Try This for JPA,
#Query(value="SELECT cb from abc cd where cd.Id in (?1) and cd.Type=?2 , (SELECT MAX(m.modificationTime) as maxModificationTime , COUNT(*) as count FROM abc m where m.Id in (?3) and m.Type=?4) as m",nativeQuery=true)
I need to create a query and I need COUNT(*) and HAVING COUNT(*) = x.
I'm using a work around that uses the CustomProjection class, that I downloaded somewhere.
This is the SQL that I try to achieve:
select count(*) as y0_, this_.ensayo_id as y1_ from Repeticiones this_
inner join Lineas linea1_ on this_.linea_id=linea1_.id
where this_.pesoKGHA>0.0 and this_.nroRepeticion=1 and linea1_.id in (18,24)
group by this_.ensayo_id
having count(*) = 2
This is the code, where I use the Projection Hibernate class:
critRepeticion.setProjection(Projections.projectionList()
.add( Projections.groupProperty("ensayo") )
.add( CustomProjections.groupByHaving("ensayo_id",Hibernate.LONG,"COUNT(ensayo_id) = "+String.valueOf(lineas.size()))
.add( Projections.rowCount() )
);
The error is:
!STACK 0
java.lang.NullPointerException
at org.hibernate.criterion.ProjectionList.toSqlString(ProjectionList.java:50)
at org.hibernate.loader.criteria.CriteriaQueryTranslator.getSelect(CriteriaQueryTranslator.java:310)
at org.hibernate.loader.criteria.CriteriaJoinWalker.<init>(CriteriaJoinWalker.java:71)
at org.hibernate.loader.criteria.CriteriaLoader.<init>(CriteriaLoader.java:67)
at org.hibernate.impl.SessionImpl.list(SessionImpl.java:1550)
at org.hibernate.impl.CriteriaImpl.list(CriteriaImpl.java:283)
at ar.com.cse.cseagro.controller.RepeticionController.buscarEnsayo(RepeticionController.java:101)
If I comment the line with CustomProjections class, the query work, but I don't get the HAVING COUNT(*) filter in the SQL ...
Basically the query try to retrieve, in a master - detail schema, all the master records where a list of details are simultaneously present, like if you want tho know "which invoices have both products, A and B".
That why if I got 3 items in the IN clause, I need to use HAVING COUNT = 3 clause.
Any idea or suggestion?
Best regards,
I figured out the problem. I replace CusotmProjections class, with:
.add( Projections.sqlGroupProjection("ensayo_id", groupBy , alias, types));
where groupBy, alias and types are:
String groupBy = "ensayo_id" + " having " + "count(*) = " + String.valueOf(lineas.size());
String[] alias = new String[1];
Alias[0] = "ensayo_id";
Type[] types = new Type[1];
types[0] = Hibernate.INTEGER;
and the magic is on groupby String. –
If someone needs to do it in grails it would be like:
projections {
groupProperty("id")
sqlGroupProjection(...)
rowCount()
}
Where sqlGroupProjection is available since 2.2.0
/**
* Adds a sql projection to the criteria
*
* #param sql SQL projecting
* #param groupBy group by clause
* #param columnAliases List of column aliases for the projected values
* #param types List of types for the projected values
*/
protected void sqlGroupProjection(String sql, String groupBy, List<String> columnAliases, List<Type> types) {
projectionList.add(Projections.sqlGroupProjection(sql, groupBy, columnAliases.toArray(new String[columnAliases.size()]), types.toArray(new Type[types.size()])));
}
http://grepcode.com/file/repo1.maven.org/maven2/org.grails/grails-hibernate/2.2.0/grails/orm/HibernateCriteriaBuilder.java/#267
Here is my sample, it works fine, maybe useful :
My sql query :
select COLUMN1, sum(COLUMN2) from MY_TABLE group by
COLUMN1 having sum(COLUMN2) > 1000;
And Criteria would be :
Criteria criteria = getCurrentSession().createCriteria(MyTable.Class);
ProjectionList projectionList = Projections.projectionList();
projectionList.add(Projections.property("column1"), "column1");
projectionList.add(Projections.sqlGroupProjection("sum(column2) sumColumn2 ", "COLUMN1 having sum(COLUMN2) > 1000" , new String[]{"sumColumn2"}, new org.hibernate.type.Type[]{StandardBasicTypes.STRING}));
criteria.setProjection(projectionList);
criteria.List();
criteria.add(Restrictions.sqlRestriction("1=1 having count(*) = 2"));
I'm new to hibernate and I've this SQL query which works perfectly
SELECT count(*) as posti_disponibili from occupazione t inner join
(select id_posto_park, max(date_time) as MaxDate from occupazione
group by id_posto_park) tm on t.id_posto_park = tm.id_posto_park and
t.date_time = tm.Maxdate and t.isOccupied = 0
which gives me all the last items with isOccupied = 0
I was porting it into Hibernate, I've tried to use
result = ( (Integer) session.createSQLQuery(query).iterate().next() ).intValue()
to return posti_disponibili but i got this exception
java.lang.UnsupportedOperationException: SQL queries do not currently support iteration
How can i solve this? I cannot find the equivalent HQL query
Thank you
I would suggest you to use
Query#uniqueResult()
which will give you single result.
select count(*) .....
will always return you a single result.
Hibernate support it's own iterator-like scroll:
String sqlQuery = "select a, b, c from someTable";
ScrollableResults scroll = getSession().createSQLQuery(sqlQuery).scroll(ScrollMode.FORWARD_ONLY);
while (scroll.next()) {
Object[] row = scroll.get();
//process row columns
}
scroll.close();
I have 2 separate tables mapped to SharedThing and TeamMember.
I have the following named query;
SELECT sharedThing
FROM SharedThing sharedThing,
TeamMember teamMember
WHERE teamMember.sharedId = sharedThing.sharedId
AND teamMember.userId = :userId
So I am passing userId as a parameter.
How do I convert the same to native sql query ?
Assuming that shared_thing table is mapped to SharedThing entity, and team_member is mapped to TeamMember:
SELECT st.*
FROM shared_thing st
JOIN team_member tm on tm.shared_id = st.id and tm.user_id = ?1
Use the join syntax and * to select all columns of a table
select s.*
from SharedThing s
inner join TeamMember t on t.sharedId = s.sharedId
where t.userId = 123