I need to define a JPA query that translates as:
SELECT
*
from
items_table
where
lower(CONCAT(item_id,' ', color,' ',details,' ')) like all ('{"%blue%", "%plastic%"}') and
store='Main' and
status='In Stock' and
item_type='Container';
the parameter list in all will be an input along with the store, status and item_type from the front end.
I understand it's the first WHERE condition you're having a problem with. If a String[]-typed parameter doesn't cut it, try using this approach, hopefully the LIKE ALL will pass through to the generated query - sth like:
#Query("SELECT i FROM Item i WHERE LOWER(CONCAT(...)) LIKE ALL :terms AND ...")
List<Item> findByTerms(TypedParameterValue terms, ...)
itemRepository.findByTerms(new TypedParameterValue(StringArrayType.INSTANCE, terms), ...)
If it turns out JPA doesn't like LIKE ALL, you'll have to keep using the native query.
Related
How can I achieve this query
select *
from table t
where name like '%Ami%'
order by (name = 'Ami') desc, length(col);
(just the sort part)
Using springframework Sort..
What I tried is
Sort.by(Sort.Direction.DESC, "name") // But I need to sort by name = 'Ami'
Sort.by(Sort.Direction.DESC, "name" = 'Ami'") // throws an error
JpaSort.unsafe(Sort.Direction.DESC, "name" = 'Ami'") // throws an error
Looks like the documentation has an example almost identical to your question:
https://docs.spring.io/spring-data/jpa/docs/2.4.5/reference/html/#jpa.query-methods.sorting
However, using Sort together with #Query lets you sneak in
non-path-checked Order instances containing functions within the ORDER
BY clause. This is possible because the Order is appended to the given
query string. By default, Spring Data JPA rejects any Order instance
containing function calls, but you can use JpaSort.unsafe to add
potentially unsafe ordering.
I would like to join two query result.
First one is
Gig.where(id:gigsInRadioIDS)
When I convert result to json I get this result
[{"id":1,"address":"test1"},{"id":2,"address":"test2"}
Second is.
Slot.where(status:"available").where(Sequel.lit('("from" > ?) AND ("to" < ?)', fromdate, todate))
when I convert result to json I get this result
[{"id":15,"status":"available","gig_id":1}]
What I want is to inner join to result
so I hope to get this result(I abbreviated some non related snippet)
[{"id":15,"status":"available","gig_id":1,"id":1,"address":"test1"}]
What I have tried is
Gig.where(id:gigsInRadioIDS).as(:tb_gig).join(Slot.where(status:"available").where(Sequel.lit('("from" > ?) AND ("to" < ?)', fromdate, todate)), gig_id: :id)
And I got this error
Sequel::DatabaseError - PG::AmbiguousColumn: ERROR: column reference "id" is ambiguous
LINE 1: ...) AS "t1" ON ("t1"."gig_id" = "gigs"."id") WHERE ("id" IN (2...
Thanks for reading this complex code.
Any news will be big help. Thanks.
There are a bunch of ways to approach it. It looks like you are querying Slots with some Gigs data mixed in, so you may want to start with your Slot model. The regular join syntax is a little easier to understand and makes it easier to select columns from both tables (i.e. instead of WHERE fk IN (..)). As a bonus, you can mix your gig_id filter into the JOIN clause. Finally, you don't need to use Sequel.lit to do greater than / less than in your WHERE clause, and you should be explicit about the columns you want to select.
Here's how I would write it:
Slot.join(:gigs, [[:id, :gig_id], [:id, gigsInRadioIDS]])
.where(status: 'available') { (from() > fromdate) & (to() < todate) }
.select(Sequel[:slots][:id].as(:slot_id), :status, :gig_id, :address)
Getting .all of the records and outputting JSON should yield something like:
[{"slot_id":15,"status":"available","gig_id":1,"address":"test1"}]
Note the Sequel[:table_name][:column_name] syntax. This is the new style of fully-qualifying identifiers in Sequel 4.49+. (In past versions of Sequel, it would have been written like :table_name__column_name, but that syntax is now deprecated.)
Your where(id:gigsInRadioIDS) translates into WHERE ("id" IN (...)), and since both gigs and slots have an "id" column, the database doesn't know which id you want.
You need to explicitly specify the table with where{{gigs[:id] => gigsInRadioIDS}}
Querying with Sequel
Ok, I feel really stupid for asking this, but it's driving me nuts and I can't figure it out. The docs say I should be able to use select AS in a Rails/ActiveRecord query. So:
d = Dvd.where(id: 1).select("title AS my_title")
Is a valid query and if I do a to_sql on it, it produces the expected SQL:
SELECT title AS my_title FROM `dvd` WHERE `dvd`.`id` = 1
However, d.my_title will give an error:
NoMethodError: undefined method `my_title' for #<ActiveRecord::Relation
I need to be able to use AS since the columns I want to retrieve from different joins have the same name so I can't access them the "regular" way and have to resort to using AS.
I also don't want to resort to using find_by_sql for future compatibility and a possible switch form Mysql to PostGresql.
Just to clarify, what I'm really trying to do is write this SQL in a Railsy way:
SELECT tracks.name AS track_name, artists.name AS artist_name, composers.name AS composer_name, duration
FROM `tracks_cds`
INNER JOIN `tracks` ON `tracks`.`id` = `tracks_cds`.`track_id`
INNER JOIN `artists` ON `artists`.`id` = `tracks_cds`.`artist_id`
INNER JOIN `composers` ON `composers`.`id` = `tracks_cds`.`composer_id`
WHERE cd_id = cd.id
The top example was just a simplification of the fact that SELECT AS will not give you an easy way to refer to custom fields which I find hard to believe.
ActiveRecord automatically creates getter and setter methods for attributes based on the column names in the database, so there will be none defined for my_title.
Regarding the same common names, why not just do this:
d = Dvd.where(id: 1).select("dvds.title")
You can write your sql query and then just pass into ActiveRecord's execute method
query = "SELECT title AS my_title FROM `dvd` WHERE `dvd`.`id` = 1"
result = ActiveRecord::Base.connection.execute(query)
I've the following Entity Model : Employee has a Company and a Company has Employees.
When using the Include statement like below:
var query = context.Employees.Include(e => e.Company);
query.Dump();
All related data is retrieved from the database correctly. (Using LEFT OUTER JOIN on Company table)
The problem is hat when I use the GroupBy() from System.Linq.Dynamic to group by Company.Name, the Employees are missing the Company data because the Include is lost.
Example:
var groupByQuery = query.GroupBy("new (Company.Name as CompanyName)", "it");
groupByQuery.Dump();
Is there a way to easily retrieve the applied Includes on the 'query' as a string collection, so that I can include them in the dynamic GroupBy like this:
var groupByQuery2 = query.GroupBy("new (Company, Company.Name as CompanyName)", "it");
groupByQuery2.Dump();
I thought about using the ToString() functionality to get the SQL Command like this:
string sql = query.ToString();
And then use RegEx to extract all LEFT OUTER JOINS, but probably there is a better solution ?
if you're creating the query in the first place - I'd always opt to save the includes (and add to them if you're making a composite query/filtering).
e.g. instead of returning just 'query' return new QueryContext {Query = query, Includes = ...}
I'd like to see a more elegant solution - but I think that's your best bet.
Otherwise you're looking at expression trees, visitors and all those nice things.
SQL parsing isn't that straight either - as queries are not always that simple (often a combo of things etc.).
e.g. there is a `span' inside the query object (if you traverse a bit) which seems to be holding the 'Includes' but it's not much help.
I have the following HQL in Hibernate using Spring MVC.
List<Colour>list=session.createQuery("from Colour order by colourId desc")
.setFirstResult((currentPage-1)*rowsPerPage)
.setMaxResults(rowsPerPage).list();
It works and returns a list of rows from the colour table (actually operates upon the Colour entity (POJO) that I can understand) in Oracle 10g.
What if I need to retrieve a list fields, I'm trying the following.
List<Colour>list=session.createQuery("colourId, colourName, colourHex from Colour order by colourId desc")
.setFirstResult((currentPage-1)*rowsPerPage)
.setMaxResults(rowsPerPage).list();
It ends with an excpetion
java.lang.IllegalArgumentException: node to traverse cannot be null!
In some articles, it was mentioned that the following version of HQL should (or may) work
List<Colour>list=session.createQuery("select colourId, colourName, colourHex from Colour order by colourId desc")
.setFirstResult((currentPage-1)*rowsPerPage)
.setMaxResults(rowsPerPage).list();
but unfortunately, it also didn't work for me. Using the createSQLQuery() method to execute native SQL would work but I want to stick to the createQuery() method with HQL unless it's absolutely necessary. How can I specify a list of fields in HQL?
I agree with yorkw's comment. If you select properties in your query then you cannot ask for a List<Colour> object to be returned from a call to .list().
Instead you should do this
List<Object[]> rows = session.createQuery("select c.colourId, c.colourName, c.colourHex " +
" from Colour c " +
" order by c.colourId desc").list();
Then iterate over the list object and instantiate your objects. Or whatever you need to do.
for ( Object[] row : rows ) {
Long colourId = (Long)row[0];
// ... etc
}
Why don't you try creating a map? Something like this:
SELECT NEW MAP( colour.colourId AS id
, colour.colourName AS name ...)
FROM Colour colour
ORDER BY colour.colourId
I use the alias for Colour "colour" so hibernate knows from which entity is the property I am referencing, I am implying all those properties are from the same entity, if not, then check your referencing!