I don’t understand why can you can't use SQL. “select _val from Book where bookName = ? And authorName = ?” would get the value from a partial key.
> On 21 Jun 2022, at 15:14, Saurabh Satardekar <satardekarsaur...@gmail.com> > wrote: > > Hi Stephen, > > Thank you for replying. > > In our use case we cannot use sql queries to get desired result. Is there any > other way that we can use to plug custom implementation of equals and > hashCode method for objects which are going to store in caches? > > Thank you , > Saurabh Satardekar. > > > > On Fri, 17 Jun 2022, 9:42 pm Stephen Darlington, > <stephen.darling...@gridgain.com <mailto:stephen.darling...@gridgain.com>> > wrote: > If you enable SQL on your table, then you can run a query that filters on a > subset of the properties. You can also add an index to make the lookup more > quickly. > >> On 17 Jun 2022, at 16:55, Saurabh Satardekar <satardekarsaur...@gmail.com >> <mailto:satardekarsaur...@gmail.com>> wrote: >> >> Respected Sir/Madam, >> We have following use case where we have Book class as follows : >> >> public class Book { >> >> private int price; >> private String bookName; >> private String authorName; >> >> public Book( String bookName, String authorName, int price ) { >> this.bookName = bookName; >> this.authorName = authorName; >> this.price = price; >> } >> >> @Override >> public boolean equals(Object o) { >> if( this == o ) return true; >> if( o == null || getClass() != o.getClass() ) return false; >> Book that = (Book) o; >> return bookName.equals(that.bookName) && authorName.equals(that.authorName); >> } >> >> @Override >> public int hashCode() { >> return Objects.hash(bookName,authorName); >> } >> } >> >> For the above class we need to compare books by using book name and its >> author name only. We don't want to include price while comparing books but >> we can't even store that information anywhere else. >> So if I have two objects as follows : >> >> Book book_1 = new Book("Book_1","ABC",100); >> Book book_2 = new Book("Book_1","ABC",200); >> >> For above objects, if I use book_1 object as my cache key and put some value >> against it into cache, I am not able to retrieve that value using my another >> object book_2 as ignite is not honoring equals method provided on Book class. >> >> We have tried implementing Externalizable interface and also by providing >> custom implementation of BinaryIdentityResolver interface. Still we are not >> getting desired output. >> >> Note : This is a sample class which we have used to describe a problem, in >> reality we are using other classes and we have a valid use case where we >> don't want to use all attributes of the class while comparing them for >> equality ( in equals and hashCode method ). >> >> Thank you, >> Saurabh Satardekar. >
