Is there anything similar to SQL LEN() Function in realm? How can I retrieve something like
SELECT * FROM Customers WHERE LEN(CustomerName) = 10;
Using realm in swift, I tried
realm.objects(Customers.self).filter("LEN(CustomerName) == 3")
got this error
Unable to parse function name 'LEN:' into supported selector (LEN:)
Realm does not yet support filtering based on the length of a string property. If this is something you'd like to use, please file an enhancement request on Realm Cocoa's GitHub page.
Maybe you are looking for #count property,
realm.objects(Customers.self).filter("CustomerName.#count == 3")
Check this collection query properties.
Related
I want to create queries using EF FromSqlInterpolated or FromSqlRaw that allows me to use Like clauses, but I don't know what is the right way to do it without opening the application to SqlInjection attacks.
One first approach has took me to the following code
var results = _context.Categories.FromSqlInterpolated(
$"Select * from Category where name like {"%" + partialName + "%"}");
First test worked fine, it returns results when providing expected strings, and returns nothing when i provide something like ';select * from Category Where name='Notes'--%';
Still I don't know much about SqlInjection, at least not enough to feel safe with the query shown before.
Does someone know if the query is safe, or if there is a right way to do it?
Thanks
From this document
The FromSqlInterpolated and ExecuteSqlInterpolated methods allow using
string interpolation syntax in a way that protects against SQL injection attacks.
var results = _context.Categories.FromSqlInterpolated(
$"Select * from Category where name like {"%" + partialName + "%"}");
Or you can also change your query to Linq-to-Entity like this way
var results = _context.Categories.Where(p => p.name.Contains(partialName ));
How should I build my findBy method name so I can implement a where clause -
statusCode != 'Denied'
Is this be an option?
findByStatusCodeNotIn(List<String> statusCode);
What if I want to just pass a String instead of a list?
Thank You
Have you taken a look at the documentation about this in the Spring Data JPA docs?
#findByStatusCodeNot(String statusCode);
It's akin the example in the docs like:
#findByLastnameNot
According to the Spring Data JPA Documentation on https://docs.spring.io/spring-data/jpa/docs/current/reference/html/#reference
you can achieve this by using the "Not" keyword. forinstance your method would be
findByStatusCodeNot(String statusCode);
This means to achieve "statusCode != 'Denied'", you would call the method as
findByStatusCodeNot('Denied');
#Dovmo is right, but also keep in mind that if you are operating on String data, you may have to take case into account, i.e. findByStatusCodeNot(String statusCode) will find only records that are not 'Denied' as is, but not for instance 'DeniEd'. For case-insensitive searches, you can append IgnoreCase - findByStatusCodeNotIgnoreCase(String statusCode)
In general, please follow the link that #Dovmo gave.
According to the spring JPA repository docs we can use the <> symbol in place of !=
so the query would be
statusCode <> 'Denied'
this would be helpful if you want to write a #Query instead of the inbuild repository methods.
I'm unable to run the FindBy magic function property in Extbase MVC
$title=array(0 =>'Books Day');
$each_event=$this->eventRepository->findByTitle($title);
$each_event is returning an object of type TYPO3\CMS\Extbase\Persistence\Generic\QueryResult .
How do I make this work?
I also tried passing in a string to findByTitle and findByOne. Both don;t work! :(
I'm using TYPO3 6.1 and extension builder.
The last part of those magic functions always needs to be a field in the database. So "title" must be in your model. You might have a field "one" for your object, but I guess you meant findOneByTitle?
The object type QueryResult is correct. You can turn it into an array for debugging purpose for example:
$foo = $query->execute()->toArray();
By the way: check wether your eventRepository is null or not and you could try this to see if it works at all:
$result = $this->myRepository->findAll();
Try
$each_event=$this->eventRepository->findByTitle($title)->toArray();
Reference to the QueryResult.
As said in the documentation, it returns a QueryResultInterface|array.
As a consequence you have to loop over the result like this:
foreach($each_event as $single_event) {
$single_event->getProperty();
}
If you are sure that it returns only one single value you could also access it by the index 0:
$each_event[0]->getProperty();
It is possible to use "AND" while querying for Objects in Entity like
Post.find("byTitleLikeAndAuthor", "%hello%", connectedUser).fetch();
but is it possible to user "OR" while querying, like
Post.find("byNameOrEmail", name, email).fetch();
Thank you
Fixed!!
Use Post.find(" name = ? or email ?", name, email).fetch();
While using "where" in the query, it fails saying "unexpected token"
It is indeed possible to use "And" clauses when constructing objects, but I'm not aware of a possibility in simplified query to use "Or".
However, play can be used in many ways. Instead of writing :
Post.find("byNameOrEmail", name, email).fetch();
You can write :
Post.find("name = ? or email = ?", name, email).fetch();
using JPQL syntax.
It's not possible to use simplified query with or. To enable it you must change the implementation of findByToJPQL in the class play.db.jpa.JPQL. Wrote test and enhance the documentation and create a patch.
How ever you can use the JPQL.
I'm working on a c# project that use a Versant Object Database back end and I'm trying to build a query that contains an arithmetic operator. The documentation states that it is supported but lack any example.
I'm trying to build something like this:
SELECT * FROM _orderItemObject WHERE _qtyOrdered - _qtySent > 0
If I try this statement in the Object Inspector I get a synthax error near the '-'.
Anyone has an example of a working VQL with that kind of statement?
Thanks
I am not sure that the Object Inspector will know the syntax for the arithmtic expression. However, in your code you should be referring to the fully qualified class. Then the syntax you are using should be perfectly fine.
Query query = new Query( session,
"select * from com.yourCompany.yourClass where _qtyOrdered - _qtySent > 0 ");
QueryResult result = query.execute();
I just tried this out on one of my classes and it worked fine.
Cheers,
-Robert
With C# and OQL you have to make sure you select the proper class extent. This is done by adding the "Extent" suffix to the class name. For example, in my Pet class I would identify all the pets with "PetExtent" in the OQL string.
Class members are accessed in the predicate by defining a local moniker, p in the code below. Any arithmetic expressions will be evaluated by the query engine.
string query="SELECT * FROM PetExtent AS p WHERE p.Name = \"Ferris\" AND (p.age + 5) > 4";
IQueryResult result = scope.GetOqlQuery(query).Execute();
foreach (object o in result)
Out(o.ToString());
The best way to test OQL with Versant's C# binding is to use the OQL Query Browser integrated into Visual Studio. Look under the Versant Menu drop down in Visual Studio.
Best Regards,
Derek